Abstract In this study, impact behavior and deformation mechanism of triply periodic minimal surface (TPMS) sheet (Schwarz’ P, Schoen’s I-WP, and Neovius) were numerically investigated. The convergence study of mesh size, sensitivity of cell number, and parametric investigation of shell thickness were performed. Three different collapse modes “ ⋁ + ⋀ = X , ” “ / + \ = X , ” and “Whole-X” were experienced

Abstract A novel multistable mechanical metamaterial showing highly tunable strength and energy absorption performance has been designed in this paper. A theoretical model is established to describe mechanical properties of the unit cell. The specimens of unit cells and metamaterials have been fabricated by fused deposition modeling additive manufacturing technology. Quasi-static compression and tensile

Abstract A prediction model of matrix crack density in ceramic matrix composites under arbitrary matrix stress distribution was proposed. The matrix was separated into many small segments whose strength was determined by stochastic defect theory. By comparing the matrix strength and stress distribution, the matrix cracking process was simulated. The model proposed in this paper can theoretically simulate

Abstract This article intends to study the performance of sandwich panels consisting of four isotropic flat plates and three trapezoidal or sinusoidal cores. The sandwich panels, subjected to the uniform loading resting on simply supported edges, are analyzed by an analytical method based on the classical plate theory and commercially available software. The homogenization method is used for the analytical

Abstract Deep foundation pits are usually located in densely built-up areas, and its stability is affected by adjacent structures. A few studies have considered the effect of surcharge load on the stability of foundation pits; such effect may lead to excessive deformation or even collapse. To determine the mechanical response of dual-row pile walls (DRPWs) in foundation pits under the action of surcharge

Abstract In this article, the low-temperature (300 °C) sintering process of silver microparticles is modeled based on coupled diffusion mechanisms. Simulations are carried out for the simplest two-particle model and for various multiparticle arrangements. Sintering evolution was studied by evaluating densification, shrinkage rate, grain boundary growth under the effect of low uniaxial sintering pressure

Abstract A magnetic-yielding zone model for an infinitely long piezo-electro-magnetic strip weakened by two mode-III semi-permeable collinear cracks is proposed. Fourier series method and integral equation technique are adopted to solve the problem. The closed-form analytical expressions are obtained for several fracture parameters, namely crack opening potential drop, crack-sliding displacement, crack

Abstract In this article, a 3D semi-analytical procedure is elaborated for static behavior of simply supported functionally graded magnetoelectroelastic laminated plates subjected to various types of loads. An arbitrary graded formulation is considered in the thickness direction. The laminated plates have been divided into some layers in which the materials properties vary through the thickness. In

Abstract To simplify the wind turbine model, we used SolidWorks and ANSYS software. Boundary conditions were selected to ensure safe and stable operation of the wind turbines. The deflection analysis of the rotor system showed that the maximum deflection of the shaft was 2.4% of the air gap, which met the design requirements. The modal analysis of the wind turbine demonstrated that resonance would

Abstract Geometrically nonlinear and elastoplastic behavior of a circular FGM (functionally graded material) plate under mechanical loading–unloading condition is investigated employing three-dimensional finite element method (FEM) modeling. The through-thickness material distribution of the FGM plate is defined by a power-law variation. The elastic mechanical properties and the elastoplastic material

Abstract With the aim of understanding failure modes in the peeling of silicone-based adhesive joints and, in particular, the occurrence of adhesive or cohesive failure, an experimental campaign has been conducted by considering plastic substrates with different surface roughness. A flexible strip has been bonded onto such substrates using a silicone adhesive, by controlling its thickness. Peeling

Abstract This paper puts forward a new method to predict the bearing strength of single bolt joint based on characteristic length method (CLM) and progressive damage model (PDM). Instead of performing the whole campaign of PDM-based CLM on whole structure of joint, the characteristic length and stress distribution of the sub-laminates obtained by dividing the original laminate are used. Stress gradient

Abstract In this paper, the effect of the porosity coefficient and its distribution on the natural frequencies and mode shapes of a thin and thick cylindrical shell made of asymmetric porous materials is investigated analytically. The mechanical properties of the porous shell are non-uniform in the thickness and isotropic in the circumferential directions. The displacement field is assumed based on

Abstract In order to simulate the casting process of a typical aluminum alloy, a 3 D entity model for a pouring system was used for numerical analysis of the filling and solidification process with ProCAST software. A comprehensive analysis including the change of temperature field, the velocity of filling, the solid phase as well as the location of casting defect, showed that the defects such as shrinkage

Abstract We study the torsion of a composite rod of a nonpiezoelectric semiconductor core coated within a piezoelectric dielectric shell. A one-dimensional model is established using the macroscopic theory of piezoelectric semiconductors. An analytical solution is obtained, showing explicitly that the mobile charges in the rod redistribute themselves axially under torsion. Hence, the composite rod

Abstract Honeycomb structure containing curved reentrant sides with negative Poisson’s ratio (NPR) was designed and the impact dynamics behaviors were studied by finite element method. The Poisson’s ratio and the energy absorption capacity of the honeycomb structure with different arc angle were studied under different compression velocities. The results show that the Poisson’s ratio of the honeycomb

Abstract This paper focuses on the influence of CNTs, porosity, mechanical and thermal loading on the vibration and dynamic response of the sandwich functionally graded carbon nanotube-reinforced composite (FG-CNTRC) composite plate. The plate is made by three layers in which the core layer is porous FGM materials, bottom and top surfaces are FG-CNTRC. The motion equations are given based on Hamilton’s

Abstract Thin-walled structures have been widely adopted in engineering projects because of the advantages of good load-bearing capacity, light weight and low cost. In this paper, a refined finite element method (FEM) based on the Carrera Unified Formula (CUF) is performed to analyze the free vibration of thin-walled beams with the variables cross-section, length and boundary. The low-dimensional FEM

In this pioneering study, the cross-sectional warping included transient response and normal/shear stress components of composite elliptical and elliptical cone helices over exact axis geometry are investigated using a mixed FEM. The transient analysis is performed using the Newmark time integration algorithm with or without the amplitude decay factor. The constitutive equations of composite curved

In this article, amplitude, and vibrational characteristics of a rotating fiber metal laminated microdisk are presented. The current microstructure is modeled as a flexible microdisk surrounded by the two-parameter viscoelastic foundation. The centrifugal and coriolis effects due to the rotation are considered. The strains and stresses can be determined via the third-order shear deformable theory.

The process-structure-property (PSP) relationship of continuous carbon fiber reinforced thermoplastics manufactured through fused filament fabrication was investigated for the first time, specifically on mode I Interlaminar Fracture toughness (ILFT). A standard double cantilever beam test is used to evaluate the mode I ILFT. The PSP relationship is established using micro-computed tomography scan and

In the present investigation, surface wave propagation in a semiconducting medium under photothermal theory has been discussed. A non-viscous fluid of uniform thickness is overlying the infinite semiconducting half-space. The governing equations for the above problem are solved for surface wave solutions. A mechanical force of constant magnitude is applied along the interface of two media. The components

Herein, the fractional derivative is firstly proposed to describe the constitutive relationship of a fluid inerter, and a dynamic model of a vibration isolation system (VIS) with both a fractional-order inerter and damper is established. The effects of the inerter parameters on the displacement transmissibility are analyzed; the results indicate that the fractional constitutive model can express the

A study on the fracture and damage-healing behavior of plain woven textile composite (PWTC) is performed in the present work. The primary objective is to conduct 2D progressive failure analysis (PFA) under static in-plane loading conditions, progressive damage-healing analysis for different cyclic strain histories, and experimental fracture studies of PWTC material. A chain of equivalent cross-ply

Compact heat exchangers for heat removal has become one of the most effective cooling techniques. In this paper, numerical scheme to simulate conjugated heat transfer using additively manufactured heat exchanger is presented. A lattice structure as porous medium is used as effective cooling techniques for heat removal. The objective of these lattices is to transmit heat from the hot part to the cold

Porous materials have been widely used in aerospace, electronic communication, petrochemical and bio-medicine, etc. due to their attractive attributes such as low relative density, thermal and acoustical insulation and good permeability. For porous materials suffering high temperature gradient or ultrafast heating, etc., it is crucial to reveal the behaviors of the thermal-induced stress and deformation

The impact response of shear deformable sandwich cylindrical shells composed of two face layers and a functionally graded (FG) porous core is investigated. The mass density and elastic moduli of FG porous core are assumed to vary along the thickness in terms of the coefficients of mass density and foam, whose relationships are determined by employing the typical mechanical characteristics of an open-cell

In this article, the dynamic response of the curved Fiber-Metal-Laminate sandwich beam with flexible core, under low-velocity impact on the top of the face sheet, is investigated. Higher order shear deformation theory is used and strain-displacement, stress-strain equations, and compatibility conditions between the core and face sheets are applied to obtain the displacement field of the core. The results

This study concerns the effect of bicrystal spatial orientation on the iron Σ5 boundary under nanoindentation tests. The orientation of the bicrystal is changed relative to the indenter by the parameter “nanoindentation angle” to create dislocation collisions with grain boundary in different directions and to determine the possibility of transmission of these dislocations through the grain boundary

This study presents the structural health monitoring system of an I-shaped steel-concrete composite girder bridge during construction and vehicle load tests. Strains and deflections were monitored. A finite element model was built and calibrated. Vehicle load tests were carried out for various load conditions. Measured results show that the strains in the concrete slab and steel beams changed rapidly

In this study, parametric sensitivity was assessed based on a theoretical model of a composite cylinder under internal pressure. By varying the fiber volume content, number of layers, wound angle, internal pressure, and thickness of prepreg, the response objects of stresses and displacement were achieved. Besides, a global and local sensitivity analysis of objectives was conducted under different stacking

This article investigates the flexural impact and damage behavior of composite sandwich beam in terms of foam core effect using the micro-computerized tomography, Micro-CT. Foam core is dominant on the damage behavior of sandwich structures. As the python scripting language was used parametric modeling, the intra-laminar damage was created with the three-dimensional explicit finite element subroutine

The mathematical model of an AFM nonuniform probe in the modified couple stress theory is derived here. The analytical method is proposed to design the configuration of the AFM probe satisfying the integer-multiples relation among frequencies. The varying cross-section of the probe is tuned to match the specific requirement. One discovers two similarity conditions such that the integer-multiples relation

Miura-ori core sandwich structures are promising substitutes to conventional honeycomb core sandwich structures for both load bearing and multifunctional applications. While quasi-static or impact behaviors have been widely studied, no theoretical work has been done yet for free vibration analysis of carbon-fiber-reinforced Miura-ori core sandwich beams (MSBs). This paper presents a simple and effective

This study delves with the reflection phenomenon of plane-waves due to incidence of quasi-longitudinal (QL) wave at a semi-infinite structure comprising of pre-stressed piezoelectric-orthotropic substrate (POS) with stress-free (Case I) and rigid (Case II) bounding surfaces. The compact-form expressions of reflection-coefficients (RCs) of reflected QL wave, quasi-transverse (QT) wave and evanescent-electroacoustic

In this article, a dynamic analysis of an offshore wind turbine (OWT) considering soil structure interaction (SSI) is performed. The design of these highly expensive structures tends to find the best compromise between cost and safety. To do so, a coupling between reliability-based design optimization and the numerical model of the OWT is required. An extension of some RBDO methods such as the optimum

The impact experiment of penetrator with enhanced lateral efficiency (PELE) penetrating the metal target plate was carried out to study the fragmentation characteristics of PELE shell made of tungsten alloy. The fragments produced by PELE shell were collected by water tank and classified according to their macromorphology. Scanning electron microscopy (SEM) was used to observe the microstructures of

Based on classical laminated plate theory, the free vibration of arbitrary straight-sided quadrilateral laminates with variable angle tows (VAT) is studied. It is assumed that the fiber orientation angle in each ply of VAT laminate varies linearly along x direction. The laminates have elastic restraints on the boundaries to simulate arbitrary boundary conditions. A four-node coordinate transformation

Motivated by the lack of sufficient accuracy in the nonlinear dynamics of the pre-stressed nano electromechanical resonators, in the present article, the concept of the dynamic instability in the pre-stressed nanoelectromechanical resonators comprehensively is investigated while the emphasis is placed on investigating the effect of the applied electric voltage. A class of nonlinear the Mathieu–Hill

The aim of the current study is to investigate torsional vibrations of bi-directional functionally graded (FG) small-scale tubes. The size effect is captured using the modified couple stress theory (MCST). Through-the-thickness distribution profile of material properties are characterized by employing a power-law function, which incorporates a gradation index, β, and longitudinal varation in material

Size-dependent buckling analysis for slightly curved sandwich microbeams made of functionally graded (FG) materials is performed via a stress-driven nonlocal model. The Fredholm integral constitutive equations are transformed into the Volterra type of the first kind and then solved analytically using the Laplace transformation and its inversion under different boundary conditions. The exact solutions

The traditional pile design method of dual-row pile wall (DRPW) occasionally considers the effect of flexural stiffness ratio between front row (FR) to rear row (RR). DRPW can no longer satisfy the requirements of settlement and deformation for substantial digging depth. This study evaluated the influence of flexural stiffness on DRPW and proposed an optimization method, namely, variable stiffness

In this research, an analytical method is presented to investigate the nonlinear response of viscoelastic cylindrical shells with the finite length under moving internal pressure by moderately large deflection assumption. The viscoelastic behavior is considered as elastic in the bulk and standard linear solid in the shear. The strain-displacement relations are defined using nonlinear von Karman relations

The ability to control equilibrium trajectory to buckling via uniform/non-uniform prebuckling stresses introduced using piezoelectric actuators creates interesting possibilities for designing smart structures. Recent innovative applications consider buckling as a favorable phenomenon in contrast to the conventional wisdom that considers the peak load carrying capacity as the sole design consideration

In this article, a first attempt has been made to address the nonlinear deflection problem of magneto-electro-elastic shells reinforced with carbon nanotubes subjected to multiphysics loads like mechanical, electric and magnetic loads. In this regard, a mathematical model based on higher-order shell theory, von-Karman’s nonlinearity is derived using finite element platform. The true flexural behavior

The telomere plays an important role to protect chromosomes from interaction with surrounding media as well as its length can be an important factor for the age prediction of an individual. Therefore, fundamental research remains relevant. The given investigation provides a numerical experiment from the mechanics perspective. By applying the DEM, the dynamics of a simplified telomere nucleotide interaction

This article presents a method to achieve the vibration response of wheel–rail beam system on the container crane and to reduce the vibration and improve the trolley speed. To investigate the coupled vibration of a trolley–beam dynamic system, the governing equation is excited to obtain the interaction during the trolley travel on the beam at high speed. We studied the wheel–rail beam system in the

(2020). Correction. Mechanics of Advanced Materials and Structures: Vol. 27, No. 17, pp. 1540-1540.

In this paper, we use shape memory alloy springs, electromagnets, ordinary springs and two metal beams to construct a double-layer phononic crystal beam. The electromagnets can be controlled to be in contact or separated by means of temperature and electric current. Firstly, we use transfer matrix method to derive the theorical solutions of the bandgap properties, and compare them with finite element

Materials and structures in practical engineering inevitably subject to dynamic loads. Surface and internal discontinuities have signification effects on wave propagation and may cause dynamic stress concentration in the vicinity of them. Thus, it is of great significance to determine the dynamic response of materials and structures with surface and internal features under elastic waves. In this article

In present work, the three-dimensional constitutive equations considering hygrothermal conditions are derived firstly, and governing equations are established subsequently. Then the finite difference method and Newmark method are used to solve the hygrothermal dynamic equations in both space and time domains, respectively. Finally, the effects of moist coefficient, fiber type and fiber arrangement

This paper addresses the influence of material and fabrication uncertainties on natural frequencies of curvilinear fiber laminate. Material properties and fiber orientation are considered uncertain. The sensitivity of input parameters to natural frequencies is obtained using high-dimensional model representation tool, and the results are compared with Monte Carlo simulation. This sensitivity pattern

The Winkler foundation model is widely used in soil calculation for the analysis of buckling failure of super-long piles. The model regards the foundation soil as an elastic body composed of discrete spring elements with the continuity of the foundation soil ignored, which is inconsistent with the actual engineering. In this paper, the double-parameter foundation model which conforms to the actual

Starting from the variational principle of virtual power for the 3-D equations of the micropolar theory of elasticity in orthogonal curvilinear coordinates and using generalized series in terms of the plate thickness coordinates a new higher order model of orthotropic micropolar plates and shells have been developed here. Following Carrera Unified Formulation (CUF), the stress and strain tensors, as

Continuous curvilinear variable stiffness (CCVS) is presented as a novel solution to improve the load carrying capacity of a fuselage panel with a cutout. The CCVS technique allows for the tow paths to curve around cutouts of arbitrary geometry with initial fiber angle and geometry as design inputs. An optimum CCVS design is generated using a genetic algorithm method coupled with a finite element model

A longitudinal failure criterion for UD composites based on a kinking model was re-constructed guided by the principles of analytic geometry. The proposed method for determining the fiber initial misalignment angle considers the shear nonlinear response of the matrix. An expression accounting for the fiber matrix coupling failure was used to simulate shear-driven fiber compression failure. Different

Negative stiffness structures (NSS), as a branch of multi-stable mechanical metamaterials, exhibit multiple stable configurations. Their characteristics, such as bistability, snap-through and negative stiffness, make them particularly suitable for shock absorber applications. The majority of NSS is designed in a cuboidal shape and only recently few studies focused on cylindrical NSS. Lately, Fraunhofer

In this article, different standard and nonstandard continualization techniques are applied to a one-dimensional solid consisting in a chain of masses interacting with nearest and next-nearest neighbors through linear springs. The study focuses on the reliability of the different continua in capturing the dispersive behavior of the discrete, on the order of the continuous governing equation because

In this study, an accurate 1D finite element model with low degrees of freedom (DOFs) is presented for the static extensional-shearing-bending analysis of curved thin-walled beams. In order to incorporate the nonclassical effects like transverse shear flexibility in the formulation, the concept of equivalent layered composite cross section (ELCS) is employed. Based on this new concept, the cross section

(2020). Correction. Mechanics of Advanced Materials and Structures: Vol. 27, No. 16, pp. 1459-1459.