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The mechanical properties and fatigue responses of fiber metal nanocomposite laminates with double-edged cracks J. Mech. (IF 1.7) Pub Date : 2022-01-05 Jen M, Hsu L, Liang Y, et al.
ABSTRACTThe fiber metal laminates (FMLs) of hybrid Ti/APC-2 neat and nanocomposite laminates were fabricated. Geometrically symmetric and anti-symmetric double-edged cracks were cut in FMLs. From tensile tests, we received the load vs. displacement curves, stress intensity factors of mixed mode and mechanical properties. From cyclic tests, the load vs. cycles (P–N) curves, residual life and failure
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Effective length of bamboo-like stiffened hollow cylindrical structures J. Mech. (IF 1.7) Pub Date : 2022-01-01 Ryo Nishiyama,Motohiro Sato
ABSTRACT Hollow cylindrical structures are susceptible to local buckling because they flatten and significantly reduce their stiffness when they bend. Therefore, many previous studies aimed to improve the strength of pipelines and building structures were conducted. Our research group has focused on bamboo and has theoretically proven that stiffness anisotropy caused by bamboo's unique nodes and vascular
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Quadrilateral layout generation and optimization using equivalence classes of integral curves: theory and application to surfaces with boundaries J. Mech. (IF 1.7) Pub Date : 2022-01-01 Kendrick M Shepherd,Xianfeng David Gu,René R Hiemstra,Thomas J R Hughes
Abstract Extracting quadrilateral layouts from surface triangulations is an important step in texture mapping, semi-structured quadrilateral meshing for traditional analysis and spline reconstruction for isogeometric analysis. Current methods struggle to yield high-quality layouts with appropriate connectivity between singular nodes (known as “extraordinary points” for spline representations) without
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Research on performance optimization of gas–liquid ejector in multiphase mixed transportation device J. Mech. (IF 1.7) Pub Date : 2022-01-01 Junyou Zhao,Xin Wei,Junyan Zou,Yaning Zhang,Jiafeng Sun,Zhongping Liu
ABSTRACT In the process of oil and gas extraction, a system that uses a pump and reversing mechanism to achieve high-efficiency export of gas–liquid mixture is devised. A gas–liquid ejector is fitted in the front of the device to boost pressure inside the tank in order to store more gas in the tank under a given volume. To meet the working conditions of gas–liquid high-efficiency transport device and
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Computational flow analysis with boundary layer and contact representation: II. Heart valve flow with leaflet contact J. Mech. (IF 1.7) Pub Date : 2022-01-01 Takuya Terahara,Takashi Kuraishi,Kenji Takizawa,Tayfun E Tezduyar
Abstract In this second part of a two-part article, we provide an overview of the heart valve flow analyses conducted with boundary layer and contact representation, made possible with the space–time (ST) computational methods described in the first part. With these ST methods, we are able to represent the boundary layers near moving solid surfaces, including the valve leaflet surfaces, with the accuracy
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Penalty coupling of trimmed isogeometric Kirchhoff–Love shell patches J. Mech. (IF 1.7) Pub Date : 2022-01-01 Davide Proserpio,Josef Kiendl
Abstract We present a formulation for isogeometric Kirchhoff–Love shell analysis on complex CAD models consisting of multiple trimmed patches. The method is based on the penalty coupling method presented in Herrema AJ, Johnson EL, Proserpio D, Wu MCH, Kiendl J, Hsu MC (Penalty coupling of non-matching isogeometric Kirchhoff–Love shell patches with application to composite wind turbine blades. Computer
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An accurate strategy for computing reaction forces and fluxes on trimmed locally refined meshes J. Mech. (IF 1.7) Pub Date : 2022-01-01 Davide D’Angella,Stefan Kollmannsberger,Alessandro Reali,Ernst Rank,Thomas J R Hughes
Abstract The finite element method is classically based on nodal Lagrange basis functions defined on conforming meshes. In this context, total reaction forces are commonly computed from the so-called “nodal forces”, yielding higher accuracy and convergence rates than reactions obtained from the differentiated primal solution (“direct” method). The finite cell method and isogeometric analysis promise
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Realization and optimization of a binary cycle power generating system using a low-grade heat source J. Mech. (IF 1.7) Pub Date : 2022-01-01 Wun-Hao Yang,Pin-Cheng Hou,Wei-Hung Shih,Sung-Wei Hsu,Yu-Bin Chen
Abstract The low-grade heat source thermoelectric system generates electricity using a working fluid at temperature lower than 100°C or gas at temperature lower than 250°C. The system is usually composed of binary (1 + 0.5 × 2) cycles. Positive net output power or high efficiency of the system can only be feasible after optimization. Most works focused on the cycle of working fluid and treated the
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Modeling intracellular transport and traffic jam in 3D neurons using PDE-constrained optimization J. Mech. (IF 1.7) Pub Date : 2022-01-01 Angran Li,Yongjie Jessica Zhang
Abstract The intracellular transport process plays an important role in delivering essential materials throughout branched geometries of neurons for their survival and function. Many neurodegenerative diseases have been associated with the disruption of transport. Therefore, it is essential to study how neurons control the transport process to localize materials to necessary locations. Here, we develop
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Cost-effective and accurate interlaminar stress modeling of composite Kirchhoff plates via immersed isogeometric analysis and equilibrium J. Mech. (IF 1.7) Pub Date : 2022-01-01 Alessia Patton,Massimo Carraturo,Ferdinando Auricchio,Alessandro Reali
Abstract The interest for composites has constantly grown in recent years, especially in the aerospace and automotive industries, as they can be moulded in complex form and geometry, as well as exhibit enhanced engineering properties. Nevertheless, despite the accelerated diffusion of laminated composites, the design of these materials is often restrained by the lack of cost-effective modeling techniques
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Computational flow analysis with boundary layer and contact representation: I. Tire aerodynamics with road contact J. Mech. (IF 1.7) Pub Date : 2022-01-01 Takashi Kuraishi,Takuya Terahara,Kenji Takizawa,Tayfun E Tezduyar
Abstract In computational flow analysis with moving solid surfaces and contact between the solid surfaces, it is a challenge to represent the boundary layers with an accuracy attributed to moving-mesh methods and to represent the contact without leaving a mesh protection gap. The space-time topology change (ST-TC) method, introduced in 2013, makes moving-mesh computation possible even when we have
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Numerical solutions of a gradient-elastic Kirchhoff plate model on convex and concave geometries using isogeometric analysis J. Mech. (IF 1.7) Pub Date : 2022-01-01 Yu Leng,Tianyi Hu,Sthavishtha R Bhopalam,Hector Gomez
Abstract In this work, we study numerical solutions of a gradient-elastic Kirchhoff plate model on convex and concave geometries. For a convex plate, we first show the well-posedness of the model. Then, we split the sixth-order partial differential equation (PDE) into a system of three second-order PDEs. The solution of the resulting system coincides with that of the original PDE. This is verified
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Study of shear locking effect on 3D solder joint reliability analysis J. Mech. (IF 1.7) Pub Date : 2022-01-01 Y W Huang,K N Chiang
Abstract The fabrication process of WLP (wafer-level packaging) has become more mature, and using the finite element method (FEM) to predict the reliability life of electronic packaging can shorten the WLP design cycles. This study adopted the NSMD (non-solder mask defined) solder joint structure in WLP and used an energy method to predict the solder joint geometry. A fixed mesh size will be determined
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Experimental study on erosion and wear law of metal screen under spraying condition J. Mech. (IF 1.7) Pub Date : 2022-01-01 Ruomeng Ying,Xuankang Zhao,Baocheng Shi,Lijuan Wu,Xingkai Zhang,Ziheng Jiang,Xiaochi Guo
ABSTRACT It is very important for the safe production of sand producing oil and gas wells to make clear the erosion law of sand control screen pipe. The experiment of erosion law of metal mesh under two working conditions of blockage and non-blockage was carried out with jet erosion experimental device. The influencing factor of solid mass fraction (0.3%, 0.5%, and 0.8%), aperture velocity (1.5 m/s
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Scattering of a scalene trapezoidal hill with a shallow cavity to SH waves J. Mech. (IF 1.7) Pub Date : 2022-01-01 Yingchao Sun,Zailin Yang,Lei Chen,Duanhua Mao
Abstract Both surface ground motion and cavity stress concentration have always been considered in the designs of earthquake engineering. In this paper, a theoretical approach is used to study the scattering problem of circular holes under a scalene trapezoidal hill. The wave displacement function was obtained by solving the Helmholtz equation that meets the zero-stress boundary conditions by the variable
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Weight functions for an array of collinear cracks in an infinite anisotropic elastic plate J. Mech. (IF 1.7) Pub Date : 2022-01-01 Kuang-Chong Wu,Shyh-Haur Chen
Abstract Weight functions are provided for calculating the stress intensity factors for collinear cracks in an infinite anisotropic elastic plate. The number of cracks as well as the length of the cracks are arbitrary. The weight functions are for crack-face loading, which may be non-self-equilibrium. It is shown that for self-equilibrium loading, the weight functions are independent of elastic constants
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Numerical study of hydrodynamic herringbone-grooved journal bearings combined with thrust bearings considering thermal effects J. Mech. (IF 1.7) Pub Date : 2022-01-01 Chin-Cheng Wang,Jyun-Ting Lin
Abstract Hydrodynamic herringbone-grooved journal bearings (HGJBs) are analyzed by solving Navier–Stokes and energy equations. It is well known that the load capacity of hydrodynamic bearings may be affected by high temperatures and low oil viscosity. Therefore, the main objective of this study is to understand the pressure distribution of hydrodynamic HGJBs under different oil viscosity and eccentricity
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An experimental study on the torsional stiffness and limit torque of a jaw coupling with consideration of spacer's hardness and installation methods J. Mech. (IF 1.7) Pub Date : 2022-01-01 Chih-Ming Chen,Huey-Ling Chang,Chun-Ying Lee
Abstract The jaw coupling with a flexible spacer is frequently used in the torque transmission between shafts with misalignment for machinery. Its torsional stiffness and limit torque closely determine the operational capacity and the dynamic characteristics of the system because the coupling is usually the most flexible link in the driving chain. In this study, the optimal design of a jaw coupling
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Backplate-reinforced structures for enhancing solder joint reliability of server CPU assembly under thermal cycling J. Mech. (IF 1.7) Pub Date : 2021-12-30 Liao M, Huang P, Huang T, et al.
ABSTRACTTo meet the requirement of the high I/O and fine-pitch interconnects, the conventional insertion-mount socket for central processing unit (CPU) has been changed to surface-mount one with ball grid array. The solder ball joint reliability of the socket used in the CPU assembly becomes very important. In this study, the socket's solder joint reliability of the backplate-reinforced CPU assembly
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IGA-PD penalty-based coupling for immersed air-blast fluid–structure interaction: a simple and effective solution for fracture and fragmentation J. Mech. (IF 1.7) Pub Date : 2021-12-21 Behzadinasab M, Hillman M, Bazilevs Y.
AbstractWe present a novel formulation for the immersed coupling of isogeometric analysis and peridynamics for the simulation of fluid–structure interaction (FSI). We focus on air-blast FSI and address the computational challenges of immersed FSI methods in the simulation of fracture and fragmentation by developing a weakly volume-coupled FSI formulation by means of a simple penalty approach. We show
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Unequal order T-spline meshes for fracture in poroelastic media J. Mech. (IF 1.7) Pub Date : 2021-12-20 Hageman T, de Borst R.
AbstractSpline-based meshes allow for a higher inter-element continuity. For coupled problems, e.g. poroelasticity, different meshes with different orders of interpolation are normally used for the various fields in order to avoid spurious oscillations. When including discontinuities in these meshes, there exist several options for the discretisation. Herein we will discuss two options which use T-splines
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The research on the dental bridge model-making process based on the curing shrinkage epoxy and residual stress reduction J. Mech. (IF 1.7) Pub Date : 2021-12-11 Yuan C, Shen G, Huang Y, et al.
AbstractElderly people suffer from more and more teeth problems. The tooth-implant-supported prosthesis provides a reliable solution to missing teeth patients. The proper dental prosthesis design to prevent overstress is essential due to the mechanical characteristics of the dental bridge abutments are different. The finite element method is widely applied, but proper experimental validation is required
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The preferential accumulation and the settling velocity of small heavy particles in Taylor–Couette flows J. Mech. (IF 1.7) Pub Date : 2021-12-09 Yang T, Shy S.
ABSTRACTIn a gap between two concentric cylinders, we discover that the small heavy particle settling velocity (Vs) is greater than its associated terminal velocity (Vt) in featureless turbulence that is generated by counter-rotating inner and outer cylinders simultaneously. The peak enhancement of Vs occurs at St × (Vt/u′) ∼ 1, where u′ and St are, respectively, the r.m.s. turbulence fluctuation velocity
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Study on carbon nanotube/shape memory polymer composites and their applications in wireless worm actuator J. Mech. (IF 1.7) Pub Date : 2021-12-03 Hsu W, Lin C, Chen Y, et al.
AbstractIn this study, the surface of the carbon nanotubes was modified by chemical functionalization. The carbon nanotubes were placed in a mixed acid solution with a nitric acid-to-sulfuric acid volume ratio of 1:3. The results of the functionalization of the carbon nanotubes were investigated by controlling the reaction time. From the experimental results, the functionalized carbon nanotubes with
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Free vibration of a single-walled carbon nanotube based on the nonlocal Timoshenko beam model J. Mech. (IF 1.7) Pub Date : 2021-10-13 Su Y, Cho T.
AbstractFree vibration of a single-walled carbon nanotube (SWCNT) embedded in an elastic medium is studied on the basis of the nonlocal Timoshenko beam model. Influences of the slenderness ratios, the boundary conditions, the atomic structures and the stiffness of the embedded medium on the natural frequencies and mode shapes of SWCNT are examined. The nonlocal effect is significant for the higher
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Dynamic stress analysis of scattering by a circular cavity in a radially inhomogeneous unbounded space under SH waves J. Mech. (IF 1.7) Pub Date : 2021-10-05 Yang Z, Xiao Y, Yang Y, et al.
AbstractThe density of a radially inhomogeneous unbounded space is derived as a function form. Harmonic dynamics stress of the radially inhomogeneous medium with a circular cavity is investigated by the complex variable function method. The governing equation under incident SH waves in the radially inhomogeneous unbounded medium is expressed as a Helmholtz equation with a variable coefficient. It is
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On underwater sound radiation in a towing tank induced by continuous machine vibration in a steel circular cylinder J. Mech. (IF 1.7) Pub Date : 2021-10-04 Wu C, Too G.
AbstractAn understanding of the characteristics and mechanisms of structural vibrations produced by underwater vehicles is required to reduce sound radiation in submarine environments. In this study, experiments were performed using a continuously running machine to produce low-frequency vibrations in a submerged, watertight, steel circular cylinder in the centre of a 176 × 8 × 4 m3 towing tank, and
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Theoretical analysis of stress intensity factor for two unequal collinear cracks subjected to internal pressure and compressive stress J. Mech. (IF 1.7) Pub Date : 2021-09-27 Zhang X, Long Q, Zheng T, et al.
AbstractIn this paper, a new solution of the stress intensity factors (SIFs) for two unequal collinear cracks is developed considering internal pressure, friction and compressive stress. The complex stress function and elliptic integral function are used to obtain the analytical solution of the SIFs, and it shows a good agreement with the previous researchers’ solutions and numerical results. The theoretical
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Development of an adaptive explicit algorithm for static simulation using the vector form intrinsic finite element method J. Mech. (IF 1.7) Pub Date : 2021-09-25 Wang M, Chuang C, Lee J.
AbstractThe vector form intrinsic finite element (VFIFE) method is a solution technique for nonlinear structural problems, which describes a continuous body using a set of particles instead of a mathematical function. Thus, a dynamic particle equation can be established by Newton's law of motion, and a viscous or kinetic damping can be introduced to obtain the steady state of the structure. This paper
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On the thermal instability of supercavitating liquid jet surrounded by coaxial rotary gas J. Mech. (IF 1.7) Pub Date : 2021-09-25 Lü M, Ning Z.
AbstractBased on the jet stability theory, under the conditions of gas rotation, fluid compressibility and supercavitation, this paper gives the mathematical model describing the thermal instability of supercavitating liquid jet surrounded by a coaxial rotary gas, and the corresponding numerical method for solving the mathematical model is proposed and verified by the data in reference. Then, this
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Warpage modeling and characterization of intelligent power modules (IPMs) J. Mech. (IF 1.7) Pub Date : 2021-09-22 Shih M, Lee T, Chang J.
AbstractIntelligent power modules (IPMs) are widely used in the electric vehicle (and hybrid electric vehicle industry nowadays due to their high power density and ability to integrate multiple components within a single package. However, the reliability of IPMs is severely degraded by the substrate warpage effect produced during the packaging process. This study therefore develops a computational
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Frequency filter for elastic bending waves: Poincaré map method and experiment J. Mech. (IF 1.7) Pub Date : 2021-09-09 Torres-Guzmán J, Arreola-Lucas A, Quintana-Moreno M, et al.
AbstractIn this work, the Poincaré map numerical method was successfully developed to solve the fourth-order differential equation that describes the flexural vibrations of a beam, within the Timoshenko beam theory. The Euler-Bernoulli continuity conditions were considered, which are valid for frequencies smaller than the critical frequency. As an example, this method was used to design a complex elastic
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Analysis of the effect of oil inlet size on the static performance characteristics of non-Newtonian lubricated hole-entry hybrid journal bearings J. Mech. (IF 1.7) Pub Date : 2021-08-10 Cao H, Huang Y, Rong Y, et al.
AbstractIn this study, the influence of inlet pocket size on the static performance of non-Newtonian lubricated hole-entry hybrid journal bearings is theoretically analyzed. The oil film of the bearing is discretized into a nonuniform mesh containing the geometric characteristics of the oil inlet pocket, and the inlet pocket is treated as a micro-oil recess. The Reynolds equation is solved by the finite
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Implementation of a parallel high-order WENO-type Euler equation solver using a CUDA PTX paradigm J. Mech. (IF 1.7) Pub Date : 2021-08-06 Kuo F, Wu J.
ABSTRACTThis study proposes the optimization of a low-level assembly code to reconstruct the flux for a splitting flux Harten–Lax–van Leer (SHLL) scheme on high-end graphic processing units. The proposed solver is implemented using the weighted essentially non-oscillatory reconstruction method to simulate compressible gas flows that are derived using an unsteady Euler equation. Instructions in the
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Fracture analysis for materials by a stable generalized/extended finite element method J. Mech. (IF 1.7) Pub Date : 2021-08-06 Jia H, Zhao Y, Nie Y, et al.
ABSTRACTIn this paper, a method is proposed for extracting fracture parameters in isotropic material cracking via a stable generalized/extended finite element method. The numerical results of the stress intensity factors and scaled condition number of the system matrix are presented and compared with different enrichment schemes or those reported in related references. The good agreement and convergence
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Investigation of fluid flow and heat transfer characteristics for a thermal anti-icing system of a high-altitude and long-endurance UAV J. Mech. (IF 1.7) Pub Date : 2021-07-15 Cheng J, Chen Y.
ABSTRACTThis research performs a three-dimensional simulation to investigate the fluid flow and heat transfer characteristics for hot-air jets impinging on the wing leading-edge surface. Both the periodic model and the whole model are proposed to examine the thermal anti-icing performance for hot air ejecting from a piccolo tube onto the impinging surface. The results show that, for the periodic model
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A thermodynamically nonlocal damage model using a surface-residual-based nonlocal stress J. Mech. (IF 1.7) Pub Date : 2021-07-15 Huang L, Yao Y.
ABSTRACTIn this research, a surface-residual-based nonlocal stress was introduced into nonlocal damage theory to describe the long-range actions among microstructures that were excluded in the definition of Cauchy stress. By using the surface-residual-based nonlocal stress tensor, a thermodynamically consistent nonlocal integral damage model was established to simulate the strain localization behavior
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Corrigendum to: Nonlinear free vibration of size-dependent microbeams with nonlinear elasticity under various boundary conditions J. Mech. (IF 1.7) Pub Date : 2021-07-12 Lin F, Peng J, Xue S, et al.
When this paper was first published, there was an error in equation 16 b-e. They incorrectly appeared as (16b–e)$$\begin{eqnarray} {{\bf H}}\left( {{\bf n}} \right) = {H_x}{{{\bf e}}_x} + {H_y}{{{\bf e}}_y} + {H_z}{{{\bf e}}_z},\quad{H_x} = \frac{{{\rm d}{\gamma _x}}}{{\left\| {{\rm d}{{\bf r}}} \right\|}} = \frac{{\partial {\gamma _x}}}{{\partial x}}{\upsilon _x} + \frac{{\partial {\gamma _x}}}{{\partial
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Construction of a curve by using the state equation of Frenet formula J. Mech. (IF 1.7) Pub Date : 2021-06-30 Chen J, Lee J, Kao S, et al.
AbstractIn this paper, the available formulae for the curvature of plane curve are reviewed not only for the time-like but also for the space-like parameter curve. Two ways to describe the curve are proposed. One is the straight way to obtain the Frenet formula according to the given curve of parameter form. The other is that we can construct the curve by solving the state equation of Frenet formula
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Characterizing the hyper-viscoelastic behavior of adhesive films J. Mech. (IF 1.7) Pub Date : 2021-06-15 Hsu H, Tsai J.
AbstractIn this study, the hyper-viscoelastic behavior of adhesive films was characterized. A constitutive model was developed by combining the Mooney–Rivlin hyperelastic model and a viscoelastic model expressed in terms of the Prony series to describe the constitutive behavior of the adhesive films. The material parameters of the developed constitutive model were determined through single-step stress
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Experimental study on two consecutive droplets impacting onto an inclined solid surface J. Mech. (IF 1.7) Pub Date : 2021-06-12 Chen C, Chen S, Yan W, et al.
AbstractThe present study is concerned with the experimental impingement of two consecutive droplets on an inclined solid surface. Attention is mainly paid to the effects of impingement timing with various oblique angles (Φ) of the surface on the impact phenomena, which mainly affect the maximum droplet spreading diameter. The investigation considers four impingement scenarios differentiated by impingement
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An investigation into the nonstationary characteristics of separation-bubble formation on a smooth circular cylinder in the critical transition range J. Mech. (IF 1.7) Pub Date : 2021-06-02 Lai Y, Miau J.
AbstractTo investigate the characteristics of the separation-bubble formation of flow over a smooth circular cylinder in the critical transition range, a sliding-window (SW) method and a peak-valley (PV) method were proposed to identify the intermittent jumps, named the characteristic events, in the real-time pressure signal obtained on both sides of the cylinder model. By evaluating the counts of
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Axisymmetric model of the sealing cylinder in service: analytical solutions J. Mech. (IF 1.7) Pub Date : 2021-05-26 Jin L, Cheng Y, Zhang K, et al.
AbstractThe stress state analysis of the sealing cylinder is of great significance for the safe operation of the sealing system. In this study, we probe a sealing system that can be simplified as an axisymmetric problem. In service, the rubber around the central pipe contacts the casing under the action of the axial pressure, and thus the sealing function is realized. The analytical solution of the
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Nonlinear free vibration of size-dependent microbeams with nonlinear elasticity under various boundary conditions J. Mech. (IF 1.7) Pub Date : 2021-05-17 Lin F, Peng J, Xue S, et al.
AbstractIn this study, nonlinear couple stress–strain constitutive relationships in the modified couple stress theory (MCST) are derived on the basis of previous classical stress–strain constitutive relationships of nonlinear elasticity materials. Hamilton's principle is employed to obtain higher-order nonlinear governing equations within the framework of the updated MCST, von Kármán geometric nonlinearity
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Optimal dynamic control for a maglev vehicle moving on multi-span guideway girders J. Mech. (IF 1.7) Pub Date : 2021-04-24 Liu L, Yau J, Qin J, et al.
AbstractAn optimal control algorithm using a virtual tuned mass damper called virtual TMD to control the levitation force of a magnetic system is developed for resonance suppression of a maglev vehicle moving on multi-span guideway girders. Since the optimal dynamic parameters of a TMD in vibration control are well developed, the optimal tuning gains required to control the magnetic oscillations of
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Dynamical response of a rotating cantilever pipe conveying fluid based on the absolute nodal coordinate formulation J. Mech. (IF 1.7) Pub Date : 2021-04-08 Li Y, Li Y, Wen H, et al.
AbstractA dynamical model of a rotating cantilever pipe conveying fluid is derived based on the absolute nodal coordinate formulation. The free vibration and dynamical response of the system are investigated in this paper. Based on the absolute nodal coordinate method and the extended Lagrangian equation proposed by Irschik for the nonmaterial system, the motion equation of the rotating flexible cantilever
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Vibration of rotating circular cylindrical shells with distributed springs J. Mech. (IF 1.7) Pub Date : 2021-03-19 Yang F, Jiang X, Du F.
AbstractFree vibrations of rotating cylindrical shells with distributed springs were studied. Based on the Flügge shell theory, the governing equations of rotating cylindrical shells with distributed springs were derived under typical boundary conditions. Multicomponent modal functions were used to satisfy the distributed springs around the circumference. The natural responses were analyzed using the
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On the linkage between influence matrices in the BIEM and BEM to explain the mechanism of degenerate scale for a circular domain J. Mech. (IF 1.7) Pub Date : 2021-03-18 Chen J, Lee J, Huang Y, et al.
ABSTRACTIn this paper, we proposed two ways to understand the rank deficiency in the continuous system (boundary integral equation method, BIEM) and discrete system (boundary element method, BEM) for a circular case. The infinite-dimensional degree of freedom for the continuous system can be reduced to finite-dimensional space using the generalized Fourier coordinates. The property of the second-order
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Hysteresis modeling of impact dynamics using artificial neural network J. Mech. (IF 1.7) Pub Date : 2021-03-17 Tabaza T, Tabaza O, Barrett J, et al.
AbstractIn this paper, the process of training an artificial neural network (ANN) on predicting the hysteresis of a viscoelastic ball and ash wood bat colliding system is discussed. To study how the material properties and the impact speed affect the hysteresis phenomenon, many experiments were conducted for colliding three types of viscoelastic balls known as sliotars at two different speeds. The
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Stress intensity factors for cusp-type crack problem under mechanical and thermal loading J. Mech. (IF 1.7) Pub Date : 2021-03-11 Chen F, Chao C, Chiu C, et al.
AbstractThe general solutions of the stress intensity factors (SIFs) for a cusp-type crack problem under remote uniform mechanical and thermal loads are presented in this work. According to the complex variable theory and the method of conformal mapping, a symmetric airfoil crack is mapped onto a unit circle, and both the temperature and stress potentials are used to solve the relevant boundary-value
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Dynamics of axially functionally graded conical pipes conveying fluid J. Mech. (IF 1.7) Pub Date : 2021-03-08 Zhao Y, Hu D, Wu S, et al.
AbstractIn this paper, the dynamics of axially functionally graded (AFG) conical pipes conveying fluid are analyzed. The materials are distributed along the conical pipe axis as a volume fraction function. Either the elastic modulus or the density of the AFG conical pipe is assumed to vary from the inlet to the outlet. The governing equation of the AFG conical pipe is derived using the Hamiltonian
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Modeling the thermomechanical behavior of a shape memory polymer Timoshenko beam J. Mech. (IF 1.7) Pub Date : 2021-03-03 Zhao F, Zhou Z, Zhou B, et al.
AbstractIn this paper, a new constitutive model that can model the thermomechanical behavior of a shape memory polymer (SMP) Timoshenko beam is established. Based on previous work, the SMP constitutive model is introduced and extended. According to Timoshenko beam theory and the SMP constitutive model, the constitutive model of an SMP beam was established using the Hamiltonian principle and energy
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On the behavior of functionally graded shape memory polymer composites under thermal coupling J. Mech. (IF 1.7) Pub Date : 2021-03-03 Liu B, Yin K, Zhang F, et al.
AbstractShape memory polymer composites (SMPC), which are a type of stimuli-responsive material, show better mechanical properties than pure shape memory polymers. However, different engineering applications have different requirements for the fiber content of SMPC. For example, some parts of the structure require more fibers to enhance strength, while other parts require fewer fibers to maintain deformability
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Directionality of butterfly leaves and nonuniform deformation mechanism in gob-side entry driving roadway J. Mech. (IF 1.7) Pub Date : 2021-02-25 Li J, Wang W, Li B, et al.
ABSTRACTExisting rock pressure theory, with the pressure-plastic zone as the core, cannot reveal the nonuniform large deformation mechanism of the surrounding rock in a deep roadway. To address this problem, the 11030 gob-side entry driving roadway of the Zhaogu No. 2 Mine is used as an example, in conjunction with elastoplastic mechanics theoretical analysis, to study the butterfly plastic region
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Analysis of misaligned journal bearing lubrication performance considering the effect of lubricant couple stress and shear thinning J. Mech. (IF 1.7) Pub Date : 2021-02-25 Zhu J, Qian H, Wen H, et al.
ABSTRACTThis paper investigates journal bearings, and builds a lubrication model taking into account misalignment, the lubricant couple stress effect and shear thinning. In order to explore the sensitivity of couple stress fluid lubrication performance to oil film thickness, we introduce the critical oil film thickness coefficient. The results show that the sensitivity increases with the increase of
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An efficient approach to reliability-based topology optimization for the structural lightweight design of planar continuum structures J. Mech. (IF 1.7) Pub Date : 2021-02-22 Yin F, Dang K, Yang W, et al.
AbstractIn order to solve the application restrictions of deterministic-based topology optimization methods arising from the omission of uncertainty factors in practice, and to realize the calculation cost control of reliability-based topology optimization. In consideration of the current reliability-based topology optimization methods of continuum structures mainly based on performance indexes model
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Torsional vibration of irregular single-walled carbon nanotube incorporating compressive initial stress effects J. Mech. (IF 1.7) Pub Date : 2021-02-22 Selim M.
AbstractThis study is an attempt to show the impacts of surface irregularity and compressive initial stresses on the torsional vibration of a single-walled carbon nanotube (SWCNT). The governing equation and corresponding closed-form solutions were derived with the aid of Hamilton's principle. Then, the natural frequencies were obtained analytically and the influences of surface irregularity and compressive
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Wind loads on a solar PV panel with side plates J. Mech. (IF 1.7) Pub Date : 2021-02-11 Chung K, Chou C, Chung C.
AbstractThis study determines the lift force on a tilted solar PV panel with/without side plates (upward and downward types). The tilt angles are 15° and 30° and the wind incidence is at an angle of 0–180° (in increments of 15°). Measurements of mean surface pressure are conducted in a closed-loop wind tunnel. The corner vortices are lessened with the presence of upward or downward side plates for
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Theoretical study on dynamic responses of an unlined circular tunnel subjected to blasting P-waves J. Mech. (IF 1.7) Pub Date : 2021-02-02 Lu S, Zhou C, Zhang Z, et al.
AbstractIn conventional studies, the blasting seismic wave is always treated as a time-harmonic wave, which is not suitable in some situations due to its short duration. In this paper, the blasting P-wave is simplified as a triangular impulse. The distribution functions of dynamic stress concentration factor (DSCF) and the radial and hoop vibration velocity scaling factors (RVSF and HVSF) around the
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Bifurcation and chaos of BNNT-reinforced piezoelectric plate under complex load J. Mech. (IF 1.7) Pub Date : 2021-01-28 Yang J, Fu G, Sun G.
AbstractBy employing piezoelectric theory with thermal effects and von Kármán nonlinear plate theory, the constitutive equations of the boron nitride nanotube (BNNT)-reinforced piezoelectric plate under complex load are set up. The material constants are calculated by using the “XY” rectangle model. Referring to the Reissner variational principle, the nonlinear motion governing equations of the structure