Abstract In the presented study, maximum amplitude, frequency, and low-velocity impact characteristics of the angle-ply laminated curved panel under external excitation is presented. Hertz contact theory is used for modeling the contact force between the impactor and angle-ply laminated curved panel. Hamilton’s principle, and first-order shear deformation theory (FSDT) are presented for obtaining the

Abstract In this article, a mathematical derivation is made to develop a nonlinear static model for the thermal post-buckling characteristics of an annular system reinforced with graphene nanoplatelets (GPLs) and coupled with the piezoelectric actuator (PA) and shape memory alloy (SMA) under lateral loading. The matrix material is reinforced with GPLs at the nanoscale. The displacement-strain of postbuckling

Abstract To design anticancer drug Taxol working more efficiently, looking at details of microtubules' dynamic behavior has become more important for researchers worldwide. According to this issue, dynamic stability analysis of microtubule-associated proteins (MAPs) using the state-space technique based on three-dimension elasticity theory is presented. Besides, the MAPs structure is under various

Abstract In the present work, a computational routine was developed in order to optimize the shifting strategies implemented in a Gear Shift Indicator to assist the driver of manual transmission vehicles according to a desired driving style. In order to achieve this goal, a simulation algorithm was developed to estimate the fuel consumption and acceleration performance of a vehicle equipped with a

Abstract The generalized thermo-viscoelastic theory without energy dissipation is used in this work to investigate the transfer of bioheat and the mechanical heat-induced response in a human skin plane tissue with variable thermal and rheological properties. Integral transformations are used for Laplace and Fourier. In the scheme of two-dimensional equations, the exponential matrix procedure, which

Abstract Current automotive brake systems (pneumatic/hydraulic) are based on a split design: a central unit providing pressure and brake calipers transforming this pressure into clamping forces. Existing electromechanical brake calipers work without a central unit; but despite their simplicity they are not yet used. One major reason is the need of high forces and high electrical power for loading brake

Abstract Enlightened by the memory dependent derivative, the present study deals with a novel mathematical model of generalized thermoelasticity to investigate the transient phenomena due to the influence of the magnetic field and moving heat source in a rod in the context of three-phase lag theory of thermoelasticity based on Eringen’s nonlocal elasticity. Both ends of the rod were fixed, and heat

Abstract This paper investigates the size-dependent nonlinear primary resonant dynamics of truncated conical microshells (TSMs) made of magnetostrictive facesheets with a functionally graded material (FGM) under external magnetic field and mechanical harmonic soft excitation. To accomplish this purpose, a framework is established using a microstructure-dependent third-order shear deformation shell

Abstract The interest on closed-form analytical sensitivity equations based on the classical forward dynamics formulations, started shortly after the equations were ready and became popular. A vast effort was devoted by the authors in the last years to derive the forward and adjoint sensitivity equations for some state-of-the-art formulations of practical interest. Recently, the forward sensitivity

Abstract The aim of this work is to investigate the influence of rotation and dual-phase-lag (DPL) theory of generalized thermoelasticity on the reflection of plane waves in a transversely isotropic thermoelastic half-space. It is supposed that the elastic half-space rotates with steady angular velocity. Since the basic equations were solved in a two-dimensional space, so three types of quasi-plane

Abstract This work compares conventional unidirectional rolling (UDR) and cross rolling (CR) based on mechanical properties, microstructure, and stored energy. Pure copper is subjected to UDR and CR to true strains of 0.69, 1.39, 2.08, and 2.77, respectively. The UDR samples show high strength and hardness compared to the CR. Investigation of microstructures of formed samples using optical microscopy

Abstract This article investigates dynamic responses of symmetric and sigmoid FG Timoshenko beam rested on elastic foundation and subjected to moving mass. The gradation is described by symmetrical and sigmoidal law functions. The Hamilton principle is exploited to derive the system equations of motion. Finite element has been developed to convert the partial differential equations to ordinary equations

Abstract The nonlinearities present in engineering structures are generally local in nature. Hence for system identification, it is required first to identify the spatial location and then the nonlinearities are characterized. Once the nonlinearity is characterized, the system identification involves identifying coefficient of nonlinear terms. In the present work, an improved version of traditional

Abstract This article studies the large deflection stability of axially functionally graded (AFG) cantilever column for analyzing post-buckling behavior. Consideration is given to a nonlinearly tapered column with a regular polygon cross section, whose volume is constant. The governing differential equations of the problem are derived based on the large deflection beam theory. To calculate the elastica

Abstract Honeycomb structures are one type of structure that has the geometry of a honeycomb to allow the minimization of the amount of used material to reach minimal material cost and minimal weight. For this issue, in the current analysis, an attempt is made to develop the nonlinear mathematical model for the chaotic and large-amplitude motions of a sandwich disk with graphene nanoplatelet face sheets

Abstract In this study, thermal buckling responses of a functionally graded (FG) cylindrical microshell are investigated. Material properties of the FG microshell are considered to be graded through the thickness based on a simple power-law distribution. The governing equations and associated boundary conditions are derived based on classical higher-order shear deformation theory. Size dependence of

Abstract In the current analysis, an attempt is made to extend a two-dimensional model for absorbed energy capability, and wave dispersion information of the functionally graded graphene nanoplatelets reinforced composite (FG-GPLRC) doubly curved panel coupled with a piezoelectric patch. The material properties of GPLRC layer are modeled by considering viscoelastic relations between stress and strain

Abstract Vulcanization is a pivotal process of tire manufacturing, endowing the uncured tire with exquisite surface pattern and superior performance by converting rubber property from plasticity to elasticity. However, the defects of incomplete expansion, asymmetric structure, and vapor condensation deposition in the existing vulcanization technology inferiorly affect the uniformity and dynamic balance

Abstract Presently, there is a dearth of professional climbers to carry out coconut harvesting because it involves considerable risk posed by the tree height and uneven trunk surface. Numerous coconut-tree-climbing devices have been developed to overcome this issue, but human effort is still required. Hence, it is imperative to develop a wheel-driven mechanism in the structure with a continuous motion

Abstract Damage is a progressive physical process that results in fracture. Recently, study of damage and failure in materials, particularly ductile metals has been of great importance for mechanical and structural engineers. So far, numerous criteria have been presented to predict damage behavior in ductile metals, each criterion is known by its advantages, disadvantages, and accuracy. One of the

Abstract Porous materials have remarkable mechanical properties. With the development of methods to produce cellular structures such as additive manufacturing, the fabrication of metal foams with the desired geometry and properties has expanded greatly. Despite the existence of more than a 100 types of cellular structures, the behavior of many of them remains unknown. Therefore, the objective of this

Abstract A leaf spring is a simple form of spring commonly used for the suspension in wheeled vehicles. Due to their high strength to weight ratio, high stiffness, and high impact energy absorption, fiber-reinforced composite leaf springs gain considerable interest recently as a potential alternative to conventional leaf springs with relatively high weight. In the present study, a novel composite leaf

Abstract The composite box girder does not satisfy the assumption of flat section in the actual force behavior. The transverse force generated by the bending is transmitted to the shear key through the web, and then transmitted to the wing plate by the shear key. The shear deformation of the channel steel box girder web makes the shear stress of the composite box girder section unevenly distributed

Abstract In this paper, the crashworthiness characteristics of tapered structures with the uniform cells in cross-section subjected to oblique impacts are theoretically and numerically investigated. Benefiting from tapered structure simplifications into the corner, crisscross and T-shape parts in non-tapered structures, an engineering formula is proposed to estimate the mean crush load during structure

Abstract Thin-plate structures are widely exploited in many areas due to their excellent structural properties. This study numerically investigates the mechanics characteristics of the stress mode shapes (SMSs) in thin plates. First, theoretical basis of the SMSs is concisely illustrated for thin-plate structures. Then, finite element models are constructed in numerical simulations. The SMSs of the

Abstract The influence of local thinning thickness defects on the buckling of cylindrical shells is investigated. A static buckling model of cylindrical shells with defects is established based on the Hamiltonian system. The complete symplectic eigensolutions of the cylindrical shell are superimposed to derive the buckling modes of the cylindrical shell with defects. A total of seven different cylindrical

Abstract The methods most commonly used to synthesize the Inverse Kinematic Model (IKM) of open-chain robotic systems strongly depend on the robot’s geometry, which make them difficult to systematize. In a previous work we presented a systematic procedure that relies on Groebner Bases to synthesize the IKM of non-redundant open-chain robots. This study expands the developed procedure with a methodology

Abstract Recently, non-prismatic beams have been considered as perfect substitutes to replace uniform cantilever beam structures in harvester design. This is due to their tendencies to provide uniform strain distribution, which enhances piezoelectric (PZT) charge generation when coupled with the beams. As the voltage produced by the PZT depends largely on the geometrical shape of the substrate, thus

Abstract In the present study, bending analysis of the functionally graded (FG) with spatial coordinates cylindrical nanoshells in a thermal environment is studied for the first time. The mechanical properties of the cylindrical nanoshells including modulus of elasticity and thermal expansion coefficient are assumed to be changed along the length, width, and thickness directions, which can change based

Abstract The nonlinear behavior of thin-walled, sinusoidal, slightly curved beams with pinned ends under lateral sinusoidal loading is considered numerically, based on Eringen’s nonlocal elasticity theory and the Euler-Bernoulli beam theory. Geometrically nonlinear governing differential equations are solved by using the finite difference method and the displacement-controlled Newton-Raphson method

Abstract A helideck is an essential structure in offshore platforms for the transportation of personnel and goods between the land and offshore sites; therefore, the overall processes from the design to the installation should be conducted carefully to ensure the safety of the platform. This article discusses an optimal structural design of a cantilever-type offshore helideck based on a genetic algorithm

Abstract The main aim of this study is to establish a hybrid quasi-3D theory for the deflections, stresses and free vibration analysis of bi-functionally graded sandwich plates resting on Pasternak’s elastic foundations. In the proposed hybrid quasi-3D theory, the polynomial function is used to describe the distribution of transverse shear strains through the thickness direction while the trigonometric

Abstract In this article, as a first attempt, Fourier series expansion (FSE), particle swarm optimization (PSO), and genetic algorithm (GA) methods are coupled for analysis of the propagated waves in the sandwich nanoplate via finding optimum phase velocity value. The FSE method is used to solve the governing equations of the nanosystem. For increasing the performance of GAs for solving the problem

Abstract An understanding of the response and perforation of thin plates to high speed rod impact is very important for design and assessment of protective structures such as whipple shields for spacecrafts and spaced armors in tanks/armoured vehicles. To this end, a theoretical and numerical study is presented herein on the perforation of thin metallic plates struck normally by long rods at velocities

Abstract 3D braided composite is gaining popularity over the traditional composite because it has a higher impact resistance, fatigue strength, stiffness in the thickness direction, anti-delamination capability, etc. Based on bridging models, the fibers are considered as transversely isotropic and matrix isotropic. The equivalent material properties of the composites are computed using a volume averaging

Abstract The Finite Strip Method (FSM) was employed to study the buckling behavior of laminated glass fiber-reinforced polymer (GFRP) stiffened plates with different boundary conditions under axial compression. The theoretical formulation was established based on the first-order shear deformation theory (FSDT) for the thin plate and the stiffener. In this formulation, the stiffeners are not required

Abstract In this study, energy harvesting from nonlinear vibrations of a functionally graded plate with bonded piezoelectric patch under moving loads and moving masses is investigated. The coupled nonlinear system of equations are derived using the generalized Hamilton’s principle considering both the geometrical nonlinearity and the nonlinear electromechanical coupling. Then, the equations are solved

Abstract In this article, wave propagation responses of a double-layer magneto-electro-viscoelastic (DLMEVE) nanoplate as an intelligent material is studied via modified couple stress and nonlocal strain gradient hypotheses to investigate magnitude of surface layers changes. Both, real and imaginary parts of wave propagation responses are considered and investigated based on the Kelvin–Voigt model

Abstract The free and forced vibration characteristics of a sandwich beam with composite face layers and partially configured carbon nanotubes reinforced magnetorheological elastomer (hybrid MR elastomer) core is presented in this article. Higher order shear deformation theory (HSDT) based on finite element (FE) formulation is employed to derive the governing equations of motion of the partially configured

Abstract This study presents an analytical solution approach to examine the nonlinear vibration of geometrically imperfect functionally graded porous circular cylindrical shells reinforced with graphene platelets (GPL) surrounded on an elastic foundation. First-order shear deformation theory is employed to formulate the considered problem. Four porosity distributions and four GPLs dispersion patterns

Abstract In the present article, the vibration response of geometrically imperfect functionally graded material (FGM) plates with geometric discontinuities and microstructural defects have been investigated. The structural kinematics used in the present study is based on logarithmic shear-strain function. A refined generalized porosity model has been developed to encompass even and uneven types of

Abstract In the present paper, a variational principle is derived for the recently introduced higher order time-fractional four-phase-lag generalized thermoelastic diffusion model for a linear, isotropic and homogeneous thermoelastic diffusive continuum. Then uniqueness of the solution for the governing field equations of the considered model is proved under suitable conditions. Finally a reciprocity

Abstract This paper presents active vibration control of smart cantilever beam using poling tuned piezoelectric actuator. The vibrating response of piezo-laminated cantilever beam is modeled using a lumped parameter approach. The fuzzy logic controller is used to control the vibration and 49 rules have been established to develop the controller. Sensor voltage and derivative of sensor voltage are considered

Abstract This article presents the development of a new combined controller based on an active steering system and an active braking system to increase maneuverability and the directional stability of the vehicle. First, to dominate the uncertainties of the dynamic model, sliding model control (SMC) method has been used. Then, to verify the performance of the proposed controller, a control system has

Abstract The problem of attitude stabilization of a rigid body is under consideration. The issue of realizing such a control system of the PID-controller type with distributed delay (integral term) is addressed. A theorem on the asymptotic stability of the stabilized position of the body, which justifies the possibility of constructing the desired control system, has been proven. The effectiveness

Abstract In this article, the bending properties of functionally graded material (FGM) sandwich beams are analyzed by using the scaled boundary finite element method (SBFEM) for the first time. The model of FGM sandwhich beams is realized by using high order spectral elements, and only the axial dimension of the beam needs to be discretized. The analytical formula along the thickness direction can

Abstract This study highlights the introduction of a new mathematical model for functionally graded thermoelastic nanobeams (FGNB) which contains a free choice of the kernel function and time delay. The basic equations that govern the proposed model have been constructed on the basis of Hamilton’s principle, Euler-Bernoulli's assumptions, Eringen’s theory and three-phase-lag memory dependent heat conduction

Abstract This paper, for the first time, presents the thermal shock response of porous functionally graded (FG) sandwich curved beams subjected to thermal shocks. The authors have used a higher-order layerwise beam theory developed for the analysis. This new layerwise theory has a higher-order displacement field for the core and a linear displacement field for top and bottom facesheets maintaining

Abstract Present study primarily focuses on interpreting the propagation pattern of Shear horizontal (SH) wave in a piezo-composite layered cylinder. The structure consists of three concentric cylinders composed of hollow fiber-reinforced (FR) cylinder enclosed within piezomagnetic (PM) cylinder along the curved surface area which is similarly superimposed by a piezoelectric (PE) cylinder. The overall

Abstract The present study deals with the nonlinear free vibration analysis of sandwich plates containing electrorheological (ER) fluid as the core layer. Since yield stress of the ER fluid is relatively low, the fluid widely operates in the post-yield region in which the shear stress and shear strain relation is no longer linear. This study employs an equivalent linearized complex shear modulus to

Abstract This study is aimed at developing a new ground motion (GM) intensity measure (IM) based on: (i) the shape of the response spectrum and (ii) spectral acceleration at the fundamental elastic period of the structure, Sa(T1). The proposed GM-IM is developed mainly for short period reinforced concrete (RC) structures subjected to near-fault (NF) pulse-like GM records. The main parameter used in

Abstract This paper investigates the free vibration behavior of a rotating functionally graded conical shell, reinforced by an anisogrid lattice structure. The material properties of the shell are assumed to be graded in the thickness direction. The governing equations have been derived based on classical shell theory and considering the effects of centrifugal and Coriolis accelerations as well as

Abstract Up to now, no researches have been yet presented to investigate the static analysis of the carbon nanotube reinforced composite (CNTRC) doubly-curved nanoshells with considering the effect of thickness stretching in thermal environment. In this paper, deflection analysis of the CNTRC doubly-curved nanoshells subjected to thermo-mechanical loading based on nonlocal strain gradient theory is

Abstract This paper examines the postbuckling behaviors of pressure-loaded laminated cylindrical shells made of carbon nanotube reinforced composite (CNTRC) under thermal environmental conditions. The shell has negative in-plane or out-of-plane effective Poisson’s ratio (EPR). The thermo-mechanical properties of CNTRCs are temperature dependent. The CNT volume fraction of the shell is in a piece-wise

Abstract In this study, the effect of nonlinear temperature gradient on the natural frequencies of functionally graded graphene platelets reinforced composite (FG-GPLRC) viscoelastic plate embedded in the visco-Pasternak foundation is examined on the basis of higher-order shear deformation theory (HSDT) numerically and analytically. By performing Hamilton’s principle, the governing equations of the

Abstract This article explores the vibration response of the hybrid composite structure with the aid of the adaptively tuned deep neural network (DNN). In order to find the features of the design-points, the semi-numerical technique is applied to the governing differential equations of the system acquired on the foundation of the kinematic theory with refined higher order terms. Considering higher

Abstract In this paper, having or lacking a rotating, magnetic field, and a time-dependent source of heat on a two-dimensional homogeneous, isotropic, and thermoelastic half-space was illustrated. The governing equations were formulated in the considering Maxwell's stresses. The surface boundary settings were explored considering the thermoelasticity model of Green and Naghdi (type II). The techniques

Abstract This work investigates the stiffness characteristics of a planar parallel manipulator with variable platforms. The stiffness model is established with shape variables of the base and mobile platforms based on the Jacobian matrix. By virtue of a nondimensionalization of the inhomogeneous stiffness matrix, two homogeneous submatrices are obtained. Upon which, two kinds of performance indices

Abstract In this article, a widely used building model, comprised of uniform coupled flexural and shear beams, herein improved by allowing for the effects of rotational inertia. Closed-form solutions in terms of trigonometric and hyperbolic functions are obtained, allowing for the explicit formulation of period ratios, modal participation factors (MPFs), mode shapes, and mode shape derivatives based

Abstract This paper aims to investigate the effects of steel-plate added damping and stiffness (ADAS) dampers, as a special kind of passive control device, on the seismic behavior of steel shear walls (SSWs). Various types of metallic dampers can be used to improve the seismic characteristics and hysteretic performance of the structures. However, ADAS dampers can increase ductility of the structures