Abstract The present research paper handles a 2D deformation in a homogeneous thermoelastic photothermal semiconducting medium subjected to a magnetic field and initial stress with an internal heat source. The problem is framed in the dimensionless form and resolved utilizing the normal mode analysis method. Based on a numerical study using the parameters of silicon as a target, the physical data were

Abstract This article presents an analytical procedure to predict the beams nonlinear natural frequencies using the first-order shear deformation theory. The nonlinear kinematics assumptions include the moderately large deformation of the mid-plane stretching and transverse deflection that are defined by using the von Kármán relations. The strains are small and Hooke’s law is used as the constitutive

Abstract This article discusses the causes of vibrations depending on unbalanced hydraulic forces in rotating and non-rotating equipment in hydraulic plants within the scope of vibration measurement standards. The radial and axial positions of the turbine shaft, normal operating conditions, the absolute vibration of the signal output velocity during startup and shutdown during unbalance condition of

Abstract In the current article, the main aim is to investigate a new model on a volume fraction, photothermal, initial stress, electromagnetic field, gravity, and rotation effect on an isotropic homogeneous semiconducting generalized thermoelasticity solid under three thermoelastic models viz: classical dynamical (CD), Lord–Shulman (LS), and dual-phase-lags (DPL). The basic governing equations of

Abstract The article proposes a general approach for solving the unified formulas of the constrained Jacobian matrix and constrained Hessian matrix of three translational and one rotational (3T1R) parallel manipulators (PMs). First, based on the constraint properties of PMs, the constrained couples of the limbs are divided into two categories: invariable and variable constrained couples. The unified

Abstract Hysteretic energy loss occurs in bistable curved beams when they undergo back-and-forth snap-throughs due to cyclic loading. While numerical models and simulations can be employed to calculate the energy loss for a given curve beam or system, the effect of design parameters of the beams on the energy loss behavior remains largely implicit in the calculation. In this work, by using a high-order

Abstract Incomplete probability information makes it impossible to determine the probability distribution of a random variable accurately. Such a lack of probability information is manifested by the fact that the reliability index of engineering products can only be estimated qualitatively and approximately based on the readily available data. In this paper, the sealing reliability of the piston–cylinder

Abstract A novel refined arctangent exponential shear deformation theory (RAESDT) is presented for analysis the mechanical behavior of both isotropic and sandwich FGM plates. Material properties are set to be isotropic at each point and varied across the thickness direction obeying to a power-law distribution of the volume fraction gradation with respect to FGM core or skins of the plate. Unlike high-order

Abstract Structures in honeycomb shapes have the configuration of a honeycomb to minimize material usage and to reach minimal cost of material and optimized weight. Thereby, this paper investigates the vibrations of sandwich disk which has imperfect honeycomb core with face sheets of graphene nano-platelets reinforced composite (GPLRC). The core of honeycomb is manufactured of aluminum based on to

Abstract The main concern of this article is to deal with the thermoelastic interaction in a functionally graded thermoelastic rod being enlightened by the memory-dependent derivative. This article investigates the transient phenomena due to the influence of an induced magnetic field of constant intensity and due to the presence of a moving heat source of constant velocity in the context of three-phase

Abstract The experimental and discrete element method was used to investigate the interaction between concrete-gypsum interface and internal notch. Gypsum and concrete semi-circular samples with diameter of 10 cm and height of 10 cm were prepared separately. Then one gypsum sample and one concrete sample was attached to each other with glue. The middle space between gypsum–concrete interface has not

Abstract This article examines the characteristics of a penetrator with a triangular cross-section perpendicular impacting a semi-infinite metal target. Experiments and numerical simulations were conducted at an impact velocity of 1600 to 1800 m/s. The model, which was constructed to analyze penetration depth, showed the effect of the nose-shaped structure of the penetrator on penetration characteristics

Abstract In this work, a numerical 3D finite element method is developed to investigate the natural frequencies and static responses of saturated FG porous annular elliptical sector plate. 3D elasticity theory is utilized to model the problem. Three various porosity patterns are assumed along the thickness direction such as porosity nonlinear symmetric distribution (PNSD), porosity nonlinear nonsymmetric

Abstract In this work, the authors develop a Reissner’s mixed variational theorem (RMVT)-based weak formulation for the three-dimensional (3 D) free vibration analysis of sandwich functionally graded (FG) truncated conical shells under various boundary conditions rotating with a constant angular velocity with respect to the central axis of the shells. The material properties of the FG layers constituting

Abstract This paper presents the vibration analysis of variable stiffness laminated composite (VSLC) elliptical plate by considering the curvilinear fibers. The problem is solved using the first-order shear deformation theory (FSDT) in conjunction with a curved trapezoidal p-element. The elements of the stiffness and mass matrices are determined analytically. The curved edges of the p-element are modeled

Abstract Condition monitoring of gearboxes running under nonstationary regimes continue to be an important source of interest for industrialists and researchers. Despite the diversity of models in the literature, none allows simulating all cases of machine operations and failures modes in nonstationary regimes. This paper will discuss through a modeling approach how speed and load variations will influence

Abstract Practical vibration-based nano-devices are normally subject to disturbances where intense vibrations reveal significant nonlinear characteristics. Efficient implementation of nonlinear nano-systems requires comprehensive knowledge of the nonlinear dynamics. Nonlinear vibration characterization of elastic nano-bars with large vibration amplitudes is rigorously examined in the present study

Abstract This article proposes static, free vibration, and buckling analysis of thin-walled functionally graded (FG) sandwich and composite channel-section beams. It is based on the first-order shear deformable beam theory, which can recover to classical one by ignoring the shear effect. Ritz’s approximation functions are developed to solve the characteristic problems. Both results from classical and

Abstract This article deals with the vibrational characteristics of a laminated composite annular microplate using a non-classical continuum theory called modified couple stress theory (MCST). Also, the structure is patched with the piezoelectric layer and covered with a viscoelastic foundation that simulated via the Kelvin-Voight model. The non-classical governing equations and boundary conditions

Abstract A continuation strategy which exploits the proposed optimization formulation to search periodic solution is presented for bifurcation tracking. The proposed optimization correction scheme integrated with the prediction-correction strategy is characterized by the minimization of the pseudo arclength equation with the imposition of optimization constraints on the harmonic balance equations and

Abstract Ply break is often encountered in laminated fiber reinforced composites under impact loading and the interface of the broken ply and the adjacent intact ply acts as a preferential site for delamination initiation and propagation. Thus improving the resistance to delamination at the interface is important in design of such laminated composites. An attempt has been made to understand the influence

Abstract The presented article deals with the vibrational and amplitude of a rotational piezoelectric nanodisk. This small-scaled structure is simulated as a nanodisk restricted by a viscoelastic foundation as the two-parameter. The Coriolis along with centrifugal influences have been considered since it has rotating parameter. The stresses and strains would be obtained using the high-order-shear-deformable-theory

Abstract In this study, a new approach is proposed for the characterization and quantification of the spiral transitions in railroad vehicle system algorithms. Definitions of the super-elevation and balance speed are provided in order to have a better understanding of their variations within the space curve of the spiral segment. In order to develop this understanding, three different curves which

Abstract This paper investigates nonlinear forced vibrations of homogeneous Euler-Bernoulli microbeams with clamped-clamped boundary conditions. Here, the nonlocal strain gradient theory is incorporated to achieve the governing nonlinear partial differential equation of motion, including mid-plane stretching and damping effects. Using the Galerkin approach, a reduced equation of motion is derived under

Abstract Contact stress distribution is sensitive to the interface shape and the material stiffness. A combination of the interface shape and the material stiffness is investigated to obtain a uniform contact stress distribution. A combined interface shape and material stiffness optimization method is developed based on the evolutionary optimization techniques. The uniformity of the contact stress

Abstract In this article, a simple prototype and control system of a lower limb exoskeleton driven by stepper motors was proposed. To study kinematic parameters of the device, a general, three-dimensional simulation model of the exoskeleton was developed. Moreover, a gait pattern was modeled for hip, knee, and ankle joints. It represents sagittal plane angular positions of joints during normal gait

Abstract Semi-supported steel plate shear walls (SSPSWs) system has been attracted the attention of researchers' interest with maintaining positive performance and reducing defects in conventional steel plate shear walls, that including stress reduction in the main columns. In the current paper, the impact of thickness and type of infill plate materials (high-strength steel ASTM A572 with yield stress

Abstract The experimental study aims to increase the axial load capacities of reinforced concrete (RC) columns with square cross-section by carbon fiber textile composite (CFRP) strips. The main purpose of the study is to develop a strengthening method that does not adversely affect displacement ductility ratios and energy dissipation capacities. Improved strengthening details have been applied to

Abstract In this article, the effects of damage (delamination) on the structural vibration characteristics of spar wingskin joints (SWJs) made with curved laminated composites are investigated. Three dimensional finite element analysis is employed to evaluate the natural frequencies and corresponding mode shapes of the joint structure considered. Virtual elements are implemented in the delamination

Abstract This article deals with the theoretical investigation of deformations in a rotating isotropic functionally graded double porous thermoelastic material (FGDPTM) with voids by means of two temperature Green-Naghdi III (G-N III) model of generalized thermoelasticity. A gravitating magneto-double-poro-thermoelastic two-dimensional substrate is influenced by both thermal shock and inclined mechanical

Abstract Stress Intensity Factor (SIF) of opposite surface cracks presented in an un-notched round bar has been determined under tension and combined load conditions. The influence of loading modes on SIF of opposite surface cracks has been attempted using numerical method. Crack depth ratio [(a/d); ‘a’ crack depth and ‘d’ diameter of the bar] ranging 0.1 to 0.4 and crack aspect ratio [(a/c); ‘a’ crack

Abstract Taking into consideration the effects of micro-inertia, flexoelectricity, and non-uniform strain, the field equations of isotropic dielectrics with centrosymmetric microstructures are specialized for a plane. Plane-wave solutions of these two-dimensional (2D) governing equations suggest the possibility of two plane waves propagating in a flexoelectric medium. Reflection phenomenon of the plane

Abstract Based on the meshing mechanism and design theory of the silent chain, a new type of dual-phase chain transmission system based on single tooth chain plate structure is innovated. The meshing design system of the chain transmission system is built through the parameter design of single tooth chain plate and dual-phase sprocket. Some dynamics parameters of the system can be obtained through

Abstract In the current report, characteristics of the propagated waves in a multi-hybrid nanocomposite (MHC) reinforced doubly curved panel is investigated. First-order shear deformable theory (FSDT) is applied to formulate the stress-strain relations. The rule of mixture and modified Halpin–Tsai model are engaged to provide the effective material constant of the composite panel. By employing Hamilton’s

Abstract A porosity-dependent nonlinear postbuckling analysis for microplates prepared from a porous functionally graded material (PFGM) is performed based on the modified couple stress theory of elasticity (MCSTE). To accomplish this purpose, the modified couple stress-based nonlinear differential equations are derived by third-order shear deformation plate theory (TSDPT). To extract PFGM microplate

Abstract Carbon nanotube (CNT) is very effective for disease treatment based on drug delivery to a target tissue, in which sustained drug release is undesirable. In the present study, magnetic-fluid flow effect and fluid and CNT size effects are investigated on the structural instability of a CNT conveying nanofluid under a longitudinal magnetic field. There is lack of research that evaluates the size-dependent

Abstract Titanium-based composites with their desirable and great mechanical properties are in high demand. One of the main problems that arise in this field is the chemical reactions that appear between strengthening the material and the matrix that usually undermines the integrity of the composite. This problem will result in dangerous defects such as debonding or degradation of the properties. In

Abstract Position tracking modeling and automatic control of an innovative anchor beam supporting robot are presented. Specifically, the forward and inverse kinematics model integrated with BP neural network and the mechanical-hydraulic co-simulation model based on ante-valve pressure compensation method are developed and applied. The experimental system is built to verify the models and method. The

Abstract Experimental studies show that softening or hardening behaviors of micro/nanostructures depend on the microstructure of the considered material. Some scale dependent theories like nonlocal elasticity, strain gradient models, and modified couple stress theory predict only softening or hardening behavior. Unlike these theories, doublet mechanics predicts both softening and hardening behaviors

Abstract The article presents a spatial linkage composed of rigid and flexible links subjected to work dependent programmed constraints. The key tool used for the spatial linkage dynamics derivation is an automated computational procedure for constrained dynamics generation. It serves systems subjected to holonomic and first order nonholonomic constraints and proved its effectiveness to open chain

Abstract In this paper, a micro-magnetic-driven tweezers is proposed based on a micro-four-link mechanism in order to simplify structure and control of the micro-tweezers. For the micro-tweezers, the calculated models of molecular forces between microstructures and micro-tweezers or substrates are established. Equations for friction forces between the micro-tweezers and microstructure are given. Relationship

Abstract In this work, the fractional order theory of thermoelasticity is introduced to study a two-dimensional fiber-reinforced problem in a half-space. The governing equations are formulated by considering the effect of the magnetic field, gravity, and moving heat source on a fiber-reinforced linearly thermoelastic isotropic medium. These equations are then transformed into non-dimensional forms

Abstract In the present work, the 2D problem of a magneto-micropolar thermoelastic medium in the context of the dual-phase-lag model with the frame of the memory-dependent derivative is established. Normal mode analysis and an eigenvalue expansion technique are used to solve the resulting non-dimensional coupled governing equations. The variations of the physical quantities with the vertical distance

Abstract The time-dependent mechanism reliability and sensitivity analysis with imprecise probability distributions is investigated in this article. First, the interval model is employed to describe the uncertainty of the parameters of input variables due to the lack of data and knowledge. Next, the form of time-dependent failure probability and global reliability sensitivity (GRS) main effect index

Abstract This paper presents the problem of nonlinear aero-thermo-elastic response of cracked plate. Bending equations of two-dimensional simply supported cracked plate subjected to supersonic flow and thermal effect is derived based on classical plate theory (CPT) and Von Kármán nonlinear relations. Linear piston theory is utilized to evaluate the aerodynamic pressure with uniform temperature variations

Abstract To avoid the problem of crowded primary and rising temperature of permanent magnet (PM), the design of partitioned primary hybrid excited linear flux switching machine (PP-HLFSM) positions the armature, and field excitation coil winding on separate part of the mover. This article examines the performance analysis of different structures of unaligned structure of PP-HLFSM and compared the proposed

Abstract Failure tests for internal pressurized composite pipe system joined by using different radii pipes were carried out by the finite element method and experimental tests. The composite pipes were produced from E glass fiber/epoxy. DP410 and DP490 type adhesives were used to join the composite pipes. The numerical results and experimental results were compared. It was shown that the numerical

Abstract The current research article deals with the study of deformation in a non-homogeneous orthotropic micropolar medium. It is assumed that the functionally graded material has non-homogeneous mechanical properties in the x-direction. The exact analytical expressions for the displacement and stress components are obtained in the physical domain by using the normal mode analysis technique. These

Abstract The size-dependent bending and free vibration of bi-directional functionally graded graphene nanoplatelets reinforced composite (BDFG-GPLRC) microbeams are investigated based on the Timoshenko beam theory and isogeometric analysis (IGA). The modified couple stress theory (MCST) is employed to describe the scale effect of microbeams. GPLs are distributed as power functions along the thickness

Abstract This work presents the influence of ballistic testing variables on residual velocity of projectile and absorbed energy of aluminum 1100-H12 using design of experiments (DOE) and artificial neural network (ANN) approach. Simulations have been carried out with three process variables: Projectile nose shape, impact velocity and target thickness. Taguchi’s technique has been employed for experimental

Abstract The size-dependent sound transmission loss problem of an air-filled functionally graded material cylindrical shell subjected to a plane progressive sound wave with even and uneven porosity distributions was analytically studied using a nonlocal strain gradient and the first-order shear deformation theories. To simulate the heterogeneous material, the impressive material properties were supposed

Abstract Strain-mediated magnetoelectric composites have experienced a recent influx of research and transitional interests since they are hypothesized to hold the potential for further miniaturization of electronic devices while being energy efficient. Regardless of their operational paradigm, i.e., direct or converse, the underlying coupling mechanisms imply the induction of mechanical stresses at

Abstract This paper investigates the buckling problem of a multi-scale hybrid nanocomposite shell for the first time while the cylinder is supposed to be rested on an elastic substrate. The constituent material is considered to be made from a polymeric matrix strengthened via both macro- and nano-scale reinforcements. The influence of nanofillers’ agglomeration, generated due to the high surface to

Abstract To retrofit reinforced concrete telecommunication towers, it is necessary to update their parameters because the structure’s bearing capacity is no longer the same as at the initial moment of commissioning. Reinforced concrete columns are elements formed from the combination of two materials—steel and concrete—making them a composite material. For the calculation of induced stresses in sections

Abstract Clearance joints and variable load have a great influence on the dynamic performance of shift manipulator for robot driver. In this article, a dynamics model of clearance joint and a simulation method of variable load are proposed to analyze the influence of clearance joint and variable load on the dynamic performance of shift manipulator. Firstly, a hybrid nonlinear contact force model is

Abstract The aim of this article is to build a mathematical model to study the problem of generalized thermoelastic porous medium according to the Lord–Shulman model and refined multi-phase lags model. The medium is considered to be homogeneous, isotropic and porous, such that changes in the size of the fracture field are in two dimensions. Four ordinary differential equations of the modified couple

Abstract The benefits of employing the virtual simulation tools tend to be amplified when applied at the initial stages of the project. In order to predict the loads acting on a component, a load generation methodology is used. The suspension loads generated depend on a series of suspension and body characteristics. These characteristics are refined to suit ride, handling and fuel consumption targets

Abstract This paper aims to evaluate the potential of lubricating pumps to reduce the fuel consumption of passenger cars under the standardized driving cycles conditions. The transient parameters of lubricating pump in a gasoline engine are measured based on the test bench, and a quasi-steady-state model is brought forward to calculate the matching work state of lubricating pump and engine lubricating

Abstract In the current study, vibration analysis of functionally graded (FG) nano-sized beams resting on a elastic foundation is presented via a finite element method. The elastic foundation is simulated by using one-parameter Winkler type elastic foundation model. Euler-Bernoulli beam theory and Eringen’s nonlocal elasticity theory are utilized to model the functionally graded nano-sized beams with

Abstract In this article, the nonlocal strain gradient theory (NSGT) has been utilized to reveal the dynamic investigation of bi-directional (2D) functionally graded (FG) porous nanoplates resting on Winkler and Pasternak elastic foundations. The governing formulations are derived via Hamilton’s principle, first-order shear deformation theory (FSDT), von-Karman geometrical nonlinearity and the principal