Computers & Structures最新文献

Exploring the inherent capacity of the multiresolution finite wavelet domain method to provide convergence indicators in transient dynamic simulations 探索多分辨率有限小波域方法在瞬态动态模拟中提供收敛指标的内在能力

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-09-07 DOI: 10.1016/j.compstruc.2024.107517

{"title":"Exploring the inherent capacity of the multiresolution finite wavelet domain method to provide convergence indicators in transient dynamic simulations","authors":"","doi":"10.1016/j.compstruc.2024.107517","DOIUrl":"10.1016/j.compstruc.2024.107517","url":null,"abstract":"<div><p>The advantages of the multiresolution finite wavelet domain method in terms of convergence speed and solution localization capabilities have been demonstrated in dynamic simulations of one- and two-dimensional solids. The first step in the multiresolution procedure entails a coarse solution, which is subsequently enriched by the calculation of finer solutions, so convergence is achieved without discarding the previous results obtained at coarser resolutions. In this work, the multiresolution structure of the method is thoroughly explored to develop two novel convergence indicators which can provide error indices for the first two steps of the process and focus the fine solutions on specific subregions, enhancing accuracy and computational speed. The first convergence indicator is based on force residuals and the second relies on the maximum ratio of the fine to total solution. Detailed examination of the multiresolution components results in profound comprehension of the way they participate to the total solution. Based on repeated observations, it is deduced that the participation of fine components to the total solution constitute metrics of convergence, permitting the termination of the hierarchical analysis without requiring convergence checks. The proposed convergence indicators can guide targeted refinement techniques and may provide the basis for a new computational paradigm.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142151943","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}

引用次数: 0

Nonlinear dynamic response of a sandwich plate with negative Poisson’s ratio honeycomb-core layer under low-velocity collision impact 具有负泊松比蜂窝芯层的夹层板在低速碰撞冲击下的非线性动态响应

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-16 DOI: 10.1016/j.compstruc.2024.107507

{"title":"Nonlinear dynamic response of a sandwich plate with negative Poisson’s ratio honeycomb-core layer under low-velocity collision impact","authors":"","doi":"10.1016/j.compstruc.2024.107507","DOIUrl":"10.1016/j.compstruc.2024.107507","url":null,"abstract":"<div><p>In this paper, a nonlinear analytical model is presented for the low-velocity collision impact of a sandwich plate with auxetic honeycomb-core layer. The auxetic feature of the honeycomb material is realized by mathematically expressing the effective material coefficients in terms of material property and cellular geometric parameters through a homogenization method. The higher order shear deformation theory, the von Kármán nonlinearity theory, and a modified Hertz contact law which accounts for the contact pressure distribution and indentation effect, are employed to establish the kinematic relations. The Newmark time integration scheme in conjunction with the direct iterative method is utilized to establish a solution procedure for the nonlinear dynamic governing equation. The verification of the presented model with the data in published literatures is carried out, followed by a series of numerical analyses for influences of cellular geometric features and impactor’s initial conditions (such as impactor’s initial velocity, mass, and nose curvature radius) on the nonlinear dynamic response. The results of numerical analyses show that the geometric features of the unit cell in the honeycomb-core and impactor’s initial conditions can cause significant influences on the nonlinear collision impact behaviors of the system.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141992874","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}

引用次数: 0

Dynamic fundamental solution of dipole for Kirchhoff plate on Winkler-Pasternak foundation 温克勒-帕斯捷尔纳克地基上基尔霍夫板偶极子的动态基本解法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-10 DOI: 10.1016/j.compstruc.2024.107498

{"title":"Dynamic fundamental solution of dipole for Kirchhoff plate on Winkler-Pasternak foundation","authors":"","doi":"10.1016/j.compstruc.2024.107498","DOIUrl":"10.1016/j.compstruc.2024.107498","url":null,"abstract":"<div><p>The Method of Fundamental Solution (MFS) for the thin plate resting on the Winkler-Pasternak elastic foundation under dynamic loading is proposed in this work. In traditional MFS, the double-source method is utilized with two free variables including the locations of source pint. In order to construct MFS with few free parameters, the main aim of this paper is to deduce two fundamental solutions for a concentrated force and a dipole of thin plate resting on the elastic foundation with damping by Laplace transform technique. The behaviours and performances of fundamental solutions are observed comprehensively. Time domain numerical results are obtained by the Durbin’s inverse method and the behaviours of fundamental solutions are observed comprehensively. The main novelty of this paper is the derivation of Laplace transformed fundamental solutions of the dipole of a Kirchhoff plate resting on the Winkler-Pasternak elastic foundation with the damping factor and comparisons have been made between Kirchhoff plate and Reissner/Mindlin plate theories under dynamic loadings. In order to show the accuracy of this methodology, numerical comparisons between the present work andeither analytical solutions or finite elementsolutions are presented. Excellent agreements with both analytical solution and finite element method solution are observed.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963758","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}

引用次数: 0

Non-intrusive reduced-order modeling for nonlinear structural systems via radial basis function-based stiffness evaluation procedure 通过基于径向基函数的刚度评估程序对非线性结构系统进行非侵入式降阶建模

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-09 DOI: 10.1016/j.compstruc.2024.107500

引用次数: 0

A contact-based constitutive model for the numerical analysis of masonry structures using the distinct element method 使用独特元素法对砌体结构进行数值分析的接触式构成模型

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-06 DOI: 10.1016/j.compstruc.2024.107499

{"title":"A contact-based constitutive model for the numerical analysis of masonry structures using the distinct element method","authors":"","doi":"10.1016/j.compstruc.2024.107499","DOIUrl":"10.1016/j.compstruc.2024.107499","url":null,"abstract":"<div><p>This study presents a robust contact constitutive model in the distinct element method (DEM) framework for simulating the mechanical behavior of masonry structures. The model is developed within the block-based modeling strategy, where the masonry unit is modeled as deformable blocks with potential crack surfaces in the middle of the bricks, while the mortar joints are defined as zero-thickness interfaces. The modeling strategy implements multi-surface plasticity with damage mechanics, including a tension cut-off, Coulomb failure criterion, and an elliptical compressive cap for the damage in tension, shear, and compression, respectively. Two new features are introduced in this contact model: a piecewise linear softening function for strength degradation in tension and shear and a hardening/softening function to phenomenologically define the compressive damage of masonry composite into the unit-mortar interface. The constitutive model is implemented in commercial DEM software using the small displacement configuration and validated against material and experimental tests on masonry walls subjected to constant pre-compression and monotonically increasing in-plane load. The experimental and numerical results regarding the force-displacement relationship and damage pattern produced by the proposed constitutive model are compared and critically discussed, demonstrating the capability of DEM coupled with the suitable constitutive law in simulating the behavior of masonry structures.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924002281/pdfft?md5=702e913655f44f4fb0c92cd3a8faf337&pid=1-s2.0-S0045794924002281-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141910851","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}

引用次数: 0

A direct differentiation method based on forward recursive formulation for flexible multibody system sensitivity analysis 基于前向递归公式的直接微分法，用于柔性多体系统敏感性分析

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-06 DOI: 10.1016/j.compstruc.2024.107465

{"title":"A direct differentiation method based on forward recursive formulation for flexible multibody system sensitivity analysis","authors":"","doi":"10.1016/j.compstruc.2024.107465","DOIUrl":"10.1016/j.compstruc.2024.107465","url":null,"abstract":"<div><p>Sensitivity analysis plays a significant role in the dynamic optimization of flexible multibody systems. The forward recursive formulation (FRF) is widely used for the dynamic modeling of multibody systems. However, it has not yet been extended to sensitivity analysis. In this paper, a new direct differentiation method is developed based on FRF for flexible multibody systems sensitivity analysis. The recursive nature of FRF allows for the Jacobian derivatives to be derived recursively, with detailed matrix expressions provided to facilitate implementation in computer code. The validity and correctness of the presented direct sensitivity analysis method based on FRF are verified by numerical examples. Besides, a modified staggered direct scheme is presented to improve the efficiency of the sensitivity analysis. In this scheme, different update strategies are adopted by different components of the tangent stiffness matrix for the implicit integrator, which balances the iteration performance and the additional computational cost. The presented scheme is compared with two conventional schemes through three examples. It demonstrates that the presented scheme can significantly improve the computational efficiency of the sensitivity analysis, particularly for complex problems, when the appropriate update strategies are employed.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141910853","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}

引用次数: 0

A wavelet-based denoising method for pipeline dent assessments 基于小波的管道凹痕评估去噪方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-05 DOI: 10.1016/j.compstruc.2024.107497

{"title":"A wavelet-based denoising method for pipeline dent assessments","authors":"","doi":"10.1016/j.compstruc.2024.107497","DOIUrl":"10.1016/j.compstruc.2024.107497","url":null,"abstract":"<div><p>Strain-based assessments of dents in buried steel oil and gas pipelines are commonly carried out in practice. Dent signals obtained from the caliper inspection tool contain noises that can have a large impact on the accuracy of the estimated strain. This paper proposes a novel wavelet-based denoising method for dent signals based on the overcomplete expansion with the corresponding dictionary constructed using the stationary and hyperbolic wavelet transforms. The proposed method is validated based on noise-free and noisy dent signals generated from elasto-plastic finite element analyses of a pipe segment subjected to an indenter and shown to be more effective than the commonly used wavelet transform-based hard- and soft-thresholding methods in terms of the root mean square error and the accuracy of the effective dent strain estimated from the denoised signal. The proposed method is further employed to denoise 42 real dent signals from in-service pipelines to illustrate its effectiveness and potential practical application to facilitate strain-based dent assessments.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924002268/pdfft?md5=f23f3f49b6c4fba9d261d0f6eaba1a7e&pid=1-s2.0-S0045794924002268-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141910852","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}

引用次数: 0

A numerical framework for modeling 3D electrostrictive dielectric elastomer actuators 三维电致伸缩介电弹性体致动器建模的数值框架

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-03 DOI: 10.1016/j.compstruc.2024.107495

{"title":"A numerical framework for modeling 3D electrostrictive dielectric elastomer actuators","authors":"","doi":"10.1016/j.compstruc.2024.107495","DOIUrl":"10.1016/j.compstruc.2024.107495","url":null,"abstract":"<div><p>In this paper, we have developed a numerical framework to investigate the effects of the electrostriction phenomenon on the deformations of three-dimensional dielectric elastomer actuators with complex geometries and inhomogeneous displacement fields at finite strains. The finite element method has been used to solve the governing equations. In this investigation, we adopt one of the most complete constitutive equations with regard to the electrostrictive behavior of dielectric elastomers which is capable of analyzing general three-dimensional states of deformation. The terms emerging in the tangent stiffness matrix as a result of the electrostrictive model are fully derived in this study. The implementation of the finite element modeling is conducted via an in-house computer code. Three three-dimensional actuators, namely a bending actuator, a buckling actuator, and a torsional actuator are selected to demonstrate the capabilities of the numerical framework. In conclusion, we have proved that the electrostriction phenomenon is effective in terms of improving the performance of dielectric elastomer actuators and in lowering their operating voltage. Moreover, the relationship of the diagonal entries of the permittivity tensor and the left Cauchy-Green tensor have been depicted on the deformed bodies of the actuators.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141891667","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}

引用次数: 0

Computational framework for a family of methods based on stress-constrained topology optimization 基于应力约束拓扑优化的一系列方法的计算框架

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-02 DOI: 10.1016/j.compstruc.2024.107493

{"title":"Computational framework for a family of methods based on stress-constrained topology optimization","authors":"","doi":"10.1016/j.compstruc.2024.107493","DOIUrl":"10.1016/j.compstruc.2024.107493","url":null,"abstract":"<div><p>This study presents a general computational framework for topology optimization under constraints related to various engineering design problems, including: reliability analysis, low-cycle fatigue assessment, and stress limited analysis. Such a framework aims to facilitate comprehensive engineering design considerations by incorporating traditional constraints such as displacement and stress alongside probabilistic assessments of fatigue failure and the complex behaviors exhibited by structures made of elastoplastic material. The framework's amalgamation of diverse analytical components offers engineers a versatile toolkit to address intricate design challenges. Notably, the inclusion of reliability analysis introduces a probabilistic perspective, transforming conventional design constraints into random parameters, thereby enhancing the robustness of the design process.</p><p>Key to the framework's efficacy is its implementation using MATLAB mathematical computing software, leveraging the platform's efficient code execution and object-oriented programming paradigm. This choice ensures an intuitive and potent environment for designers and researchers, facilitating seamless adaptation across various engineering applications. Additionally, the proposed previously by the Authors algorithm for the topology optimization is extended by adaptive strategy allowing for efficient adjustment of an amount of material removed at individual optimization step.</p><p>The presented framework is offering a comprehensive and integrated approach to address multifaceted design challenges while enhancing design robustness and efficiency.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924002220/pdfft?md5=54d93361ed8a873db90e2f4b67c3407a&pid=1-s2.0-S0045794924002220-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141891581","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}

引用次数: 0

A hybridization of growth optimizer and improved arithmetic optimization algorithm and its application to discrete structural optimization 增长优化器与改进算术优化算法的混合及其在离散结构优化中的应用

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-08-01 DOI: 10.1016/j.compstruc.2024.107496

{"title":"A hybridization of growth optimizer and improved arithmetic optimization algorithm and its application to discrete structural optimization","authors":"","doi":"10.1016/j.compstruc.2024.107496","DOIUrl":"10.1016/j.compstruc.2024.107496","url":null,"abstract":"<div><p>This paper proposes an improved hybrid growth optimizer (IHGO) to solve discrete structural optimization problems. The growth optimizer (GO) is a recent metaheuristic that has been successfully used to solve numerical and real-world optimization problems. However, it has been found that GO faces challenges with parameter tuning and operator refinement. We also noticed that the formulation of GO has some drawbacks, which may cause degradation in optimization performance. Compared to the original GO, four improvements are introduced in IHGO. First, the learning phase of GO is improved to avoid useless search and reinforce exploration. To do this, the exploration phase of an improved metaheuristic called IAOA is incorporated into the learning phase of GO. Second, the replacement strategy of GO is modified to prevent the loss of the best-so-far solution. Third, the hierarchical structure of GO is modified. Fourth, some adjustments are made to the reflection phase of GO to promote the exploitation of promising regions. To demonstrate the performance of the proposed IHGO, four discrete optimization problems of skeletal structures are provided. The results are compared with those of the original GO and some other metaheuristics in the literature. The source codes of IHGO are available at <span><span>https://github.com/K-BiabaniHamedani/Improved-Hybrid-Growth-Optimizer</span><svg><path></path></svg></span>.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141891796","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}

引用次数: 0