International Journal of Engineering Science最新文献

{"title":"A complementary energy-based constitutive model for the Mullins effect","authors":"Edgár Bertóti","doi":"10.1016/j.ijengsci.2024.104195","DOIUrl":"10.1016/j.ijengsci.2024.104195","url":null,"abstract":"<div><div>A phenomenological pseudo-elastic model for isotropically elastic, incompressible materials exhibiting Mullins-type dissipation has been developed using a complementary energy-based approach. The work-conjugate constitutive variables in the inverse stress–strain relations are the Hencky logarithmic strain tensor and the Cauchy stress tensor. The thermo-mechanically consistent pseudo-elastic model is derived by applying the dissipation inequality in terms of complementary energy. The basic constitutive model for the virgin material is described by a complementary energy potential, which is assumed to be a power-law function of the second and third invariants of the deviatoric Cauchy stress tensor. The scalar measure of the maximum load is chosen to be the basic complementary energy. The virgin state variable describes the amplification of the logarithmic strain and behaves monotonically with respect to the Cauchy stress along the secondary loading paths. The applicability and efficacy of the model are demonstrated for uniaxial tension problems. The basic model contains three fitting parameters, and the monotonic amplification of the logarithmic strain is described by one additional fitting parameter. The predictive capability of this four-parameter pseudo-elastic model is validated through parameter fitting procedures using three different sets of experimental data from the open literature.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104195"},"PeriodicalIF":5.7,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A thermo-poroelasticity model for partially saturated porous media","authors":"Zhi-He Jin ,&nbsp;Michael L. Peterson","doi":"10.1016/j.ijengsci.2024.104196","DOIUrl":"10.1016/j.ijengsci.2024.104196","url":null,"abstract":"<div><div>This work describes a thermo-poroelasticity model for a porous medium filled by two immiscible fluids in the framework of the Biot theory of poroelasticity. Local thermal equilibrium is assumed, i.e., the solid, the wetting fluid and the nonwetting fluid experience the same temperature variation in a continuum material particle. The constitutive relations in the present model include the thermally induced fluid content variations for both the wetting and nonwetting fluids. The model is employed to study the thermo-poroelastic responses of a borehole in a partially saturated, infinite porous medium subjected to a uniform temperature variation at the borehole boundary. The Laplace transform technique is used to obtain closed form, short time solutions for the thermally induced pore pressure and stress fields around the borehole. The analytical solutions indicate that the pore pressures of both the wetting and nonwetting fluids around the borehole at short times are characterized by the complementary error functions with the time scaled by partial saturation parameters as well as the thermal diffusivity of the porous medium. The numerical results for a porous medium dominantly filled by the wetting fluid indicate that the peak thermal pore pressure of the wetting fluid is much higher than that in the corresponding porous medium fully saturated by the wetting fluid while the thermal fluid content variation of the wetting fluid becomes lower due to partial saturation. Partial saturation also increases the thermal radial stress but the thermal hoop stress is relatively insensitive to partial saturation.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104196"},"PeriodicalIF":5.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Propagation of elastic waves in a fluid-filled cylindrical cavity located in a poroelastic medium: The influence of surface tension","authors":"Irina Markova,&nbsp;Mikhail Markov,&nbsp;Rafael Ávila-Carrera","doi":"10.1016/j.ijengsci.2024.104197","DOIUrl":"10.1016/j.ijengsci.2024.104197","url":null,"abstract":"<div><div>In this work, synthetic waveforms generated by a point source of acoustic oscillations in a cylindrical cavity filled with a fluid are calculated using Biot's theory. The calculations are performed for the case when the pores and the cavity are filled with different immiscible fluids. The influence of surface tension on the parameters of elastic waves is investigated. It is shown that the influence of the effects associated with the presence of the surface tension is significant in the low frequency range (<em>k_f R</em>) &lt; 1, where <em>k_f</em> is the wave number of the longitudinal wave in the fluid; <em>R</em> is the cavity radius.</div><div>The influence of capillary effects on the velocity and attenuation of the low-frequency zero-order normal mode (<em>i. e.,</em> the Stoneley wave) has been studied. It is shown that the velocity and attenuation of this wave depend significantly on the surface tension at the boundary between the porous medium and the cavity. Our results show that the influence of capillary forces on kinematic and dynamic parameters of the zero-order normal mode increases with decreasing signal frequency.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104197"},"PeriodicalIF":5.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A thermodynamically consistent theory for flexoelectronics: Interaction between strain gradient and electric current in flexoelectric semiconductors","authors":"Yilin Qu ,&nbsp;Ernian Pan ,&nbsp;Feng Zhu ,&nbsp;Qian Deng","doi":"10.1016/j.ijengsci.2024.104165","DOIUrl":"10.1016/j.ijengsci.2024.104165","url":null,"abstract":"<div><div>This paper presents a continuum theory for flexoelectric semiconductors and analyzes the interaction between electric currents and inhomogeneous deformations, which provides an opportunity for strain gradient engineering. Basic principles for continuum physics, including mass conservation, charge conservation, balance of linear momentum, balance of angular momentum, electrostatics, and thermodynamic laws, are established in the reference configuration for a semiconducting continuum under finite deformation. Then, free-energy imbalance (dissipation inequality) is derived. Based on the dissipation inequality and the Coleman-Noll procedure, thermodynamically consistent constitutive equations are obtained, which account for piezoelectric, flexoelectric, thermoelectric couplings, and drift-diffusion effects for electric currents. The heat conduction equation and Joule heating generation are also derived by combining the energy balance and the second Gibbs relation. Additionally, the principle of virtual work for strain gradient-dependent semiconducting continuum under finite deformation is established. The framework is then geometrically linearized for applications in infinitesimal deformation and small concentration perturbations of free carriers. Based on the reduced linear model, we obtain the exact solutions for the plan-strain problem and then analyze the tuning mechanisms of different mechanical forces on the distribution of free carriers. It is observed that bending and shear deformation would induce the electric polarization and redistribution of free carriers along the thickness direction, whilst extension and thickness-stretch would induce polarization along the axial direction. Furthermore, based on the nonlinear model, we obtain the mechanical effect on the I-V characteristics of p-type flexoelectric semiconductors and flexoelectric PN junctions. Interestingly, mechanical forces can be seen as switches to gate the electric currents in semiconductor devices via flexoelectric polarizations. The theoretical model proposed in this article can guide the design of flexoelectronic devices and can also be used to analyze the flexoelectric effect in piezotronic devices. Since the formulation is based on finite deformation theory, it is also suitable for the analysis and design of flexible electronic devices.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104165"},"PeriodicalIF":5.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A time-domain viscoelastic model of nonlinear compression behavior under cyclic loading","authors":"Jia-Xuan He ,&nbsp;Zhao-Dong Xu ,&nbsp;Qiang-Qiang Li ,&nbsp;Zhong-Wei Hu ,&nbsp;Ya-Xin Wei ,&nbsp;Teng Ge ,&nbsp;Yao-Rong Dong ,&nbsp;Xing-Huai Huang ,&nbsp;Gabriele Milani","doi":"10.1016/j.ijengsci.2024.104200","DOIUrl":"10.1016/j.ijengsci.2024.104200","url":null,"abstract":"<div><div>Viscoelastic (VE) pads, commonly employed as passive damping components in damping devices to absorb and dissipate energy, present challenges in predicting the mechanical behavior under large deformation due to significant nonlinearity. This study introduces a novel nonlinear time-domain model to accurately characterize the response of VE pads subjected to cyclic loading across small, moderate, and large compressive deformations. Effects such as strain hardening, the Mullins effect, continuous stress softening, and residual deformation are incorporated into the model. The proposed model integrates hyperelastic, viscoelastic, and elastoplastic parts, arranged in parallel, each addressing distinct aspects of the mechanical behavior. The hyperelastic part captures the time-independent response, in particular strain hardening in nonlinear stiffness. The VE part accounts for the frequency-dependent damping behavior, focusing on the initial unloading stiffness, the shape and area of the hysteresis loop, and major residual deformations. The elastoplastic part models the frequency-dependent plasticity, adjusting residual deformation and determining the extent of Mullins effect and continuous stress softening. Model parameters are determined through fitting procedures using uniaxial quasi-static and cyclic compression test data, allowing for an accurate description of the nonlinear mechanical behavior in the time domain. To assess the prediction capacity and applicability of the proposed model, the simulation results are comparatively evaluated by error analysis. The sensitivity analysis is further performed to investigate the influence of individual parameters. The proposed model demonstrates high accuracy and robustness in representing the mechanical behavior of VE pads across small, moderate, and large compressive deformations. The parameters in the hyperelastic, viscoelastic, and elastoplastic parts have accurate interpretations, providing distinct roles and contributions to the overall mechanical behavior.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104200"},"PeriodicalIF":5.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth in biphasic tissue","authors":"Marlon Suditsch,&nbsp;Franziska S. Egli,&nbsp;Lena Lambers,&nbsp;Tim Ricken","doi":"10.1016/j.ijengsci.2024.104183","DOIUrl":"10.1016/j.ijengsci.2024.104183","url":null,"abstract":"<div><div>Continuum mechanical models for growth and remodelling of biological tissue are well suited for the description of physiological and pathological processes, such as bone remodelling, muscle adaption or the progression of a tumour. An overview of four selected growth models from the literature is given and fundamental kinematic and multiphasic approaches for open and closed systems are outlined. Beyond that, a biphasic model using the Theory of Porous Media is enhanced by the kinematic split of the deformation gradient for the study of a growing cylinder. Based on the analytical solution of the specific case without outflow, a novel growth approach is developed allowing a gradual consideration of the kinematic split. Subsequently, this approach is applied to the extended case with outflow and evaluated numerically. Herein, consolidating characteristics of growth that are driven by the interaction of fluid pressure and solid stress are identified. Finally, a numerical example of a growing body embedded in surrounding tissue shows that residual compressive stresses arise due to incompatible deformation.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104183"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Negative electrical conductivity metamaterials and their properties","authors":"Edward Bormashenko","doi":"10.1016/j.ijengsci.2024.104198","DOIUrl":"10.1016/j.ijengsci.2024.104198","url":null,"abstract":"<div><div>The system of non-interacting electrically charged core-massless spring-shell mechanical units, demonstrating negative effective mass, is considered, seen as a Drude–Lorentz gas. When such an ideal gas is exposed to the external harmonic field, it demonstrates as the certain conditions the negative frequency-dependent electrical conductivity. The negative value of the electrical conductivity <span><math><mi>σ</mi></math></span> implies that the electrical current will flow against the direction of the electric field and correspondingly the direction of the electrical force. Low- and high-frequency asymptotic behavior of the electrical conductivity is addressed. The same system demonstrates at low frequencies the negative asymptotic refraction. Experimental realization of the introduced model system, based on the exploitation of plasma oscillations of the free electron gas is suggested.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104198"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-dependent stability of embedded beams with variable cross section","authors":"Ömer Civalek ,&nbsp;Bekir Akgöz","doi":"10.1016/j.ijengsci.2024.104210","DOIUrl":"10.1016/j.ijengsci.2024.104210","url":null,"abstract":"<div><div>This paper deals with the investigation of the elastic stability of double tapered microbeams embedded in Winkler elastic foundation. It is considered that the microbeam is embedded in a continuous elastic constraint and its cross-section changes linearly along the longitudinal direction. Nonlocal couple stress theory and Bernoulli-Euler beam theory are used to obtain the size-dependent constitutive equation. Rayleigh-Ritz method with algebraic polynomials is utilized to find the minimum eigenvalue as the critical buckling load for simply supported tapered microbeams. The effects of taper ratio, taper type, nonlocal and length scale parameters, and foundation parameter are comprehensively examined.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"208 ","pages":"Article 104210"},"PeriodicalIF":5.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On nonlinear 3D electro-elastic numerical modeling of two-phase inhomogeneous FG piezocomposites reinforced with GNPs","authors":"Mohammad Malikan ,&nbsp;Shahriar Dastjerdi ,&nbsp;Magdalena Rucka ,&nbsp;Mehran Kadkhodayan","doi":"10.1016/j.ijengsci.2024.104174","DOIUrl":"10.1016/j.ijengsci.2024.104174","url":null,"abstract":"<div><div>The novelty here comes from not only the perfect nonlinear three-dimensional (3D) electro-elasticity investigation but also the mixed material itself. The literature widely showed mechanical assessments on the piezoelectric structures; however, a lack of nonlinear three-dimensional elasticity studies has been witnessed on these kinds of smart materials. Therefore, a nonlinear 3D elasticity-piezoelectricity coupling is considered in this study. What is more, this research brings about an era in the field of sensing manufacturing such as sensors and actuators by proposing the construction of these devices in an advanced composite framework. The piezoelectric medium can be electro-mechanically improved with the aggregation of graphene platelets/nanoplatelets (GPLs/GNPs) based on the functionally graded (FG) composition. The assumption for such a smart composite has been made to provide higher flexibility smart tools while their elastic strength can also get further. To accomplish this, the derivation of a rigorous mathematical model has come out for a transversely isotropic inhomogeneous FG-piezoelectric beam-like sensor/actuator using 3D kinematic displacements, geometrically nonlinear strains, Lagrange technique, 3D stress-strains tensors, linear elastic material, and in particular Halpin-Tsai micro-mechanic model. Numerical modeling has been built by the generalized differential quadrature (GDQ) technique. A comprehensive parametric study has also been established for intelligent FG beams.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"207 ","pages":"Article 104174"},"PeriodicalIF":5.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large deflection of a nonlocal gradient cantilever beam","authors":"Daniele Ussorio ,&nbsp;Marzia Sara Vaccaro ,&nbsp;Raffaele Barretta ,&nbsp;Raimondo Luciano ,&nbsp;Francesco Marotti de Sciarra","doi":"10.1016/j.ijengsci.2024.104172","DOIUrl":"10.1016/j.ijengsci.2024.104172","url":null,"abstract":"<div><div>Analysing scale phenomena in nanostructures is crucial for modelling and optimizing modern nanotechnological devices. Notably, soft nanostructures can be effectively designed as basic components of smart electro-mechanical systems that require geometrically nonlinear analyses as their structural parts undergo large deflection. Adoption of non-conventional approaches for accurate assessment of size effects is thus needed. The paper investigates the elastostatic behaviour of small-scale beams experiencing large displacements exploiting a consistent model of integral gradient elasticity. An iterative analytical solution procedure is proposed to address the geometrically nonlinear problem of soft nanobeams. The presented nonlocal stress gradient methodology is able to capture both stiffening and softening size-dependent nonlinear responses, thus generalizing the outcomes contributed by <span><span>Vaccaro (2022)</span></span>. Effectiveness of the proposed approach for modelling and designing next-generation smart devices is finally shown by solving applicative nanomechanical problems. The presented methodology can be further extended to nonlinear analyses of three-dimensional nanocontinua to capture size effects of arbitrarily shaped structures undergoing large configuration changes.</div></div>","PeriodicalId":14053,"journal":{"name":"International Journal of Engineering Science","volume":"206 ","pages":"Article 104172"},"PeriodicalIF":5.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}