Computers & Structures最新文献

{"title":"Thermomechanical modeling in elastic body with corotated total Lagrangian SPH","authors":"Wanki Lee,&nbsp;Dongbin Shin","doi":"10.1016/j.compstruc.2024.107428","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107428","url":null,"abstract":"<div><p>In this paper, we propose a novel thermal deformation formulation for elastic bodies' thermomechanical simulation with total Lagrangian smoothed particle hydrodynamics (TLSPH), which employing fixed reference configuration. We utilize implicit corotated TLSPH as a base methodology to address tensile instability and enhance the robustness of simulation. The reference configuration of heat transfer model is updated, but the reference configuration of thermal deformation model is fixed like TLSPH. As particle's temperature is changed, the inter-particle distance in reference configuration is updated by using linear thermal expansion theory. Validation involved two basic cantilever beam loading cases and a thermomechanical analysis with heat-induced thermal deformation on a cantilever beam. The TLSPH simulation results were compared against Finite Element Method simulations and analytical solutions, demonstrating equivalent accuracy across all tests. This study indicates the potential for conducting a wide array of simulations involving thermal deformation using the TLSPH method, which efficiently supports parallel computing on an individual particle basis.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141290805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rock-like fracture simulation by a double energy-limiter nonlocal damage model","authors":"Hung Thanh Tran ,&nbsp;Tinh Quoc Bui","doi":"10.1016/j.compstruc.2024.107418","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107418","url":null,"abstract":"<div><p>Fracture mechanisms of brittle rocks are usually different from each other, i.e., in mode-I and mode-II. To simulate crack propagation in rock-like materials under compression, the distinctions of mode-I and mode-II failure behavior must be taken into account. Here we present a novel double-nonlocal damage formulation, which is highly suitable for modeling mixed-mode brittle failure in rock and rock-like materials. The damage formulations describe the fracture mechanisms of the two modes through two separate damage evolution equations (corresponding to mode-I and mode-II, respectively) based on our recently developed energy limiter-based gradient-enhanced damage model. The differences in the opening and shear modes of the crack are distinguished by the input data required for the two damage evolution equations including the fracture energy, initial damage thresholds, and crack driving forces. Numerical simulations under the standard FEM framework are performed to reveal the advantages and capacity of the developed double damage model for quasi-static crack growth in rocks. Obtained numerical solutions are then validated to referred experimental data and numerical results from other modeling techniques in the literature to see the accuracy of the developed theory.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shape optimization of hyperelastic structures subject to frictionless contact","authors":"Filip Sjövall ,&nbsp;Mathias Wallin ,&nbsp;Daniel A. Tortorelli","doi":"10.1016/j.compstruc.2024.107426","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107426","url":null,"abstract":"<div><p>This paper describes the shape optimization of hyperelastic structures exhibiting finite deformation and contact. The structure's shapes are parameterized with B-splines and the spline control point coordinates serve as the design variables. This design parametrization provides precise boundary representations and analytical sensitivity computations. To accommodate non-matching grids between the contacting bodies the mortar method is employed and, to hasten computations the accelerated Uzawa scheme is used to solve the displacement and contact pressure update equations. The formulation is used to optimize structures to achieve the desired mechanical response by exploiting both the non-linear hyperelastic material response and the contact phenomena.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S004579492400155X/pdfft?md5=b80514051d582e26a7ae29d6decbb6c7&pid=1-s2.0-S004579492400155X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"A return-free integration for anisotropic-hardening elastoplastic models","authors":"Li-Wei Liu ,&nbsp;Zih-Ce Ciou ,&nbsp;Po-Ho Chen","doi":"10.1016/j.compstruc.2024.107423","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107423","url":null,"abstract":"<div><p>This paper develops a numerical integration for an elastoplastic model for hardening materials which has an anisotropic yield surface, and displays asymmetric behavior under tension and compression yielding. The model also captures nonlinear isotropic and kinematic hardening and softening behavior. The developed numerical integration, called return-free integration, automatically updates the stress on the yield surface during the plastic phase, hence it is capable of simulating the behavior of the anisotropic-hardening material model exactly. Furthermore, the return-free integration for the material model is examined through the analysis of consistency errors, average errors, and iso-errors. The influence of the non-zero initial condition of stress, pre-straining path, and loading paths on the consistency error is explored. The convergence analysis of average error is investigated and the iso-error maps are established. All error analysis demonstrates the return-free integration for the proposed model with the anisotropic yield surface and the nonlinear isotropic-kinematic-mixed hardening rule is stable, acceptable, and reliable.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal Uniform Strength Design of Frame and Lattice Structures","authors":"Christian Iandiorio ,&nbsp;Daniele Milani ,&nbsp;Pietro Salvini","doi":"10.1016/j.compstruc.2024.107430","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107430","url":null,"abstract":"<div><p>This paper provides a procedure to obtain the uniform strength of frame and lattice structures. Uniform strength condition is achieved by performing the shape optimization of all beam elements of the structure. The beam shape which guarantees uniform strength is analytically deduced from the one-dimensional Timoshenko model. The optimization problem presents itself as the search for the zeros of the objective-functions vector, which is a non-linear system of equations representing the kinematic-congruence and forces balance at every node of the structure. The analytical formulation of the optimization problem allows to construct the objective-functions vector without the use of external structural computation, i.e. not recurring to any Finite Element Analysis to accomplish iterations. This latter feature entails a great advantage in terms of computing time required to perform optimization. The proposed analytical formulation allows to directly insert the uniform strength condition into the objective-functions vector, transforming the optimization into an unconstrained problem. Some examples are shown in which the performance of the optimization procedure is discussed in terms of robustness and rate of computational complexity while increasing the degrees of freedom of the structure. The reliability and the quality of the optimization are verified through Finite Element Analysis.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924001597/pdfft?md5=ba6ed3389fc17d5292eecadb972e934c&pid=1-s2.0-S0045794924001597-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"A geometrically nonlinear finite element formulation for buckling analysis of shear deformable angle-ply composite beam-type structures","authors":"Damjan Banić,&nbsp;Goran Turkalj,&nbsp;Domagoj Lanc","doi":"10.1016/j.compstruc.2024.107427","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107427","url":null,"abstract":"<div><p>This paper introduces an improved shear-deformable beam formulation for nonlinear buckling analysis of laminated composite beam-type structures with thin-walled cross-sections. Each wall of a cross-section is assumed to be a thin symmetric and balanced angle-ply laminate. The incremental equilibrium equations of a straight beam element are derived by applying the virtual work principle within the framework of updated Lagrangian formulation, Hooke’s law and the nonlinear displacement field of a thin-walled cross-section, which takes into account restrained warping and large rotation effects. Incremental stress resultants are calculated by the Timoshenko–Ehrenfest beam theory for bending and the modified Vlasov theories for torsion. Shear coupling problems occurring at non-symmetric thin-walled cross-sections and arising from the shear forces-warping torsion moment couplings are considered. As a result, new shear-correction factors for a cross-section composed of thin angle-ply laminates are derived. Force recovering is performed according to the conventional procedure based on the concept of semitangential rotations. The shear-locking occurrence is prevented by applying the Hermitian cubic interpolation functions for deflections and twist rotation, and the associated quadratic functions for slopes and warping. The effectiveness of the proposed geometrically nonlinear shear-deformable beam formulation is validated through the test problems.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bridge dynamic response analysis considering the spatial dependency of uncertainty parameters","authors":"Yilin Li ,&nbsp;Wen-Yu He ,&nbsp;Wei-Xin Ren ,&nbsp;Yu Zhou","doi":"10.1016/j.compstruc.2024.107424","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107424","url":null,"abstract":"<div><p>Uncertain parameters with spatial dependency exist in actual bridges inevitably, which significantly affect the bridge dynamic response. However, such spatial dependency is often neglected when investigating its influence on bridge response. This study proposes a bridge dynamic response analysis method considering the spatial dependency of uncertain parameters. Firstly, the bridge uncertain parameter is described by a non-probabilistic interval field model, and the spatial dependency between adjacent values of the interval field is quantified by the Karhunen-Loève like expansion. Thus the bridge is transformed into a system with multidimensional interval parameters by finite element method. Then, the system with multidimensional interval parameters is decomposed into several one-dimensional subsystems with only one interval parameter. Finally, the interval parameters of each one-dimensional system are divided into several subintervals with small uncertainties, and the dynamic response is obtained by combining analysis of subinterval results. Numerical examples are used to verify the accuracy and efficiency of the proposed method, and the results indicate that the proposed method significantly reduces the computational effort and improves the computational efficiency. Higher level of spatial dependency of the interval field, larger subinterval number, and lower uncertainty level of the non-probabilistic interval field leads to higher dynamic analysis accuracy.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-linear 1D 16-DOF finite element for Fiber Reinforced Cementitious Matrix (FRCM) strengthening systems","authors":"Natalia Pingaro,&nbsp;Gabriele Milani","doi":"10.1016/j.compstruc.2024.107422","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107422","url":null,"abstract":"<div><p>The paper presents a novel non-linear one-dimensional finite element with 16 degrees of freedom aimed at modelling Fiber Reinforced Cementitious Matrix strengthening systems. Such composite is typically constituted by three superimposed layers −namely an outer matrix, a central fiber textile and an inner matrix- subjected to a prevailing longitudinal monoaxial stress state. They interact by means of interfaces exchanging both tangential and −when the reinforcing system is applied to curved substrates- traction/compression stresses. Matrix is made by mortar −possibly reinforced- exhibiting medium to high strength, whereas the fiber net can be aramid, carbon, glass, steel, basalt, etc. The reinforcing system is then connected to a substrate by means of a further interface. The finite element is a two-noded assemblage of three trusses representing matrix and fiber layers. Shear and normal springs are lumped at the nodes, mutually connecting contiguous trusses and the inner matrix to the substrate. They represent the interfaces and exchange normal and shear actions between contiguous layers or transfer them from the reinforcing system to the substrate. The degrees of freedom, 8 per node, are the longitudinal and transversal displacements of the three layers and of the substrate, evaluated at the nodes. Material non-linearity can be considered both for trusses and springs, giving the possibility to account for all the experimentally documented damaging cases that can be encountered in practice. Both softening and inelastic behavior are numerically tackled with a fully explicit algorithm where the elastic modulus of the layers and the stiffness of the interfaces are reduced at the new iteration if in the previous one the elastic limit is exceeded. The stiffness matrix is provided straightforwardly also in the inelastic case, showing the promising simplicity of the element when coupled with the non-linear solver. The performance of the novel finite element is validated against a comprehensive experimental dataset referring to curved masonry pillars reinforced with Fiber Reinforced Cementitious Matrix and tested in single lap shear.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924001512/pdfft?md5=2783e64348bea5beab29539b41a90699&pid=1-s2.0-S0045794924001512-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141239436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"The method of fundamental solutions for solving scattering problems from infinite elastic thin plates","authors":"Andreas Karageorghis ,&nbsp;Daniel Lesnic","doi":"10.1016/j.compstruc.2024.107419","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107419","url":null,"abstract":"<div><p>We investigate different variants of the method of fundamental solutions for solving scattering problems from infinite elastic thin plates. These provide novelty and desirable ease of implementation as direct accurate and fast solvers to be used iteratively in solving the corresponding inverse problems. Various direct problems associated with physical states of clamped, simply supported, roller–supported and free plates can be solved efficiently using the proposed meshless method. In particular, the numerical implementation performed for clamped plates leads to results showing very good agreement with the analytical solution, where available, and with previously obtained boundary integral method solutions. As for the inverse obstacle identification, the study further develops a constrained nonlinear regularization method for identifying a cavity concealed in an infinite elastic thin plate that has important benefits to the structural monitoring of aircraft components using non–destructing material testing.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Topology optimization of anisotropic structure for arbitrary objective functionals with exact free boundary representation","authors":"Yi Cui ,&nbsp;Wenzhi Yang ,&nbsp;Toru Takahashi ,&nbsp;Toshiro Matsumoto","doi":"10.1016/j.compstruc.2024.107405","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107405","url":null,"abstract":"<div><p>A new approach to performing sensitivity analysis of arbitrary objective functionals for anisotropic elasticity is proposed in this work. Three different objective functionals have been considered, and good agreement is achieved between derived topological derivatives and numerical ones. Following the verification of topological derivatives, structural topology optimizations for selected anisotropic problems are conducted. To efficiently achieve the exact free boundary representation, our Finite Element Method (FEM)-based optimization comprises two loops. In the initial loop, a fixed and coarse mesh is employed to solve the anisotropic problem and update the level-set function. Once this loop concludes, the second loop reconstructs the material domain, ensuring an exact boundary representation. The convergence of the second loop is facilitated by (1) utilizing topological derivatives instead of explicit derivatives of <em>ϕ</em> (similar to density derivatives) and (2) imposing the exact volume constraint on the Reaction-Diffusion Equation (RDE)-based level-set method. Moreover, we introduce a scheme to prevent structural breakdown, allowing for the standalone implementation of Loop 2 always with exact free boundary representation. The previously proposed algorithm for the exact volume constraint has been generalized to accommodate inequalities, resulting in an acceleration of the equivalent optimization process.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141164647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}