Computers & Structures最新文献_第10页

Extended spectral element formulation for modeling the propagation of nonlinear ultrasonic waves produced by multiple cracks in solid media 模拟固体介质中多裂纹产生的非线性超声波传播的扩展谱元公式

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107639

Feilong Li , Yue Su , Xiaoqiang Sun

{"title":"Extended spectral element formulation for modeling the propagation of nonlinear ultrasonic waves produced by multiple cracks in solid media","authors":"Feilong Li , Yue Su , Xiaoqiang Sun","doi":"10.1016/j.compstruc.2024.107639","DOIUrl":"10.1016/j.compstruc.2024.107639","url":null,"abstract":"<div><div>This study presents a novel time-domain extended spectral element method (TD-XSEM) that can efficiently and accurately simulate interactions between ultrasonic waves and multiple randomly distributed and oriented cracks in solid materials. Compared to the conventional TD-SEM, which excels at large-scale structures but struggles with small discontinuities and contact issues, our TD-XSEM integrates linear finite elements to model these challenges effectively. Moreover, it preserves the efficiency of spectral elements in intact regions. Our unique frictional contact formulation employs the Heaviside function in discontinuous elements with enriched corner nodes. Rigorous validation against interactions of longitudinal waves with randomly distributed and oriented cracks shows superior convergence and accuracy of TD-XSEM. The proposed approach is further applied to capture second harmonic Lamb wave propagation and mixing bulk wave phenomena, demonstrating its feasibility and robustness in modeling complex interactions between ultrasonic waves and multiple random cracks. Implemented in C, TD-XSEM offers unprecedented accuracy and geometric flexibility in analyzing contact acoustic nonlinearity owing to multiple frictional cracks, contributing to the field of non-destructive testing. This study establishes a new framework for efficient and accurate wave-crack interaction simulations in complex solid structures.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107639"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142911791","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

Topology optimization of lattice structures for target band gaps with optimum volume fraction via Bloch-Floquet theory 基于Bloch-Floquet理论的最佳体积分数目标带隙晶格结构拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107601

F. Gómez-Silva , R. Zaera , R. Ortigosa , J. Martínez-Frutos

{"title":"Topology optimization of lattice structures for target band gaps with optimum volume fraction via Bloch-Floquet theory","authors":"F. Gómez-Silva , R. Zaera , R. Ortigosa , J. Martínez-Frutos","doi":"10.1016/j.compstruc.2024.107601","DOIUrl":"10.1016/j.compstruc.2024.107601","url":null,"abstract":"<div><div>In this work, a topology optimization algorithm has been developed to design bi-material lattice structures showing a band gap around a target frequency, using just one unit cell through the application of Bloch-Floquet theorem. The Bidirectional Evolutionary Structural optimization (BESO) method has been employed, based on bi-material interpolation. A new objective function has been defined, which uses only the natural frequencies closest to the target one, regardless of their position with respect to the fundamental natural frequency. This reduces the computational cost by limiting the number of frequencies considered, and improves the robustness of the optimization process, as these frequencies adapt to changes in the distribution of materials within the domain, constantly encompassing the target frequency. In addition, a novel approach has been implemented to determine the optimal volume fraction of the materials forming the structure, a parameter typically predefined in other works before starting the optimization process. Consequently, the algorithm can autonomously identify the volume that produces the widest band gap around the target frequency. The algorithm has been evaluated for different cases of lattice structures formed by the periodic repetition of a unit cell in both 1D (1D-CR) and 2D (2D-CR), comparing some results with those obtained in other works through different approaches.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107601"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841245","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

Coupling of finite and boundary element methods for contact analysis of dielectric solids immersed in electrostatic medium 静电介质中介电固体接触分析的有限元和边界元耦合方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107591

Moonhong Kim, Dongwoo Sohn

{"title":"Coupling of finite and boundary element methods for contact analysis of dielectric solids immersed in electrostatic medium","authors":"Moonhong Kim, Dongwoo Sohn","doi":"10.1016/j.compstruc.2024.107591","DOIUrl":"10.1016/j.compstruc.2024.107591","url":null,"abstract":"<div><div>This paper introduces a novel approach for analyzing the frictionless two-dimensional contact between dielectric solids in an electrostatic medium. This analysis is achieved by combining the finite element and boundary element methods. The finite elements model elastic dielectric solids undergoing geometrically nonlinear mechanical deformation and electric polarization. We present a finite element-based contact formulation to address the electromechanical contact between dielectric solids. To enforce the contact condition, we employ the nested augmented Lagrangian method. In contrast, the boundary element method is applied to consider the electrostatic medium surrounding the dielectric solids. The boundary elements are coupled with the finite elements on the surfaces of the dielectric solids. This coupling and elaborate treatment of transition zones between contacting and non-contacting solid surfaces ensures accurate capture of electrical interactions along all boundaries. Our proposed method successfully passes a contact patch test even with non-matching meshes. To further validate the effectiveness of our approach, we provide numerical examples that explore the impact of piezoelectricity and flexoelectricity. These examples demonstrate the applicability of the proposed method.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107591"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841192","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 finite element analysis of layered steel fiber reinforced concrete beams 层状钢纤维混凝土梁非线性有限元分析

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107637

Anas M.H. Fares, Burcu Burak Bakir

{"title":"Nonlinear finite element analysis of layered steel fiber reinforced concrete beams","authors":"Anas M.H. Fares, Burcu Burak Bakir","doi":"10.1016/j.compstruc.2024.107637","DOIUrl":"10.1016/j.compstruc.2024.107637","url":null,"abstract":"<div><div>This study investigates the effect of fiber properties and SFRC layer thickness on the flexural behavior of layered beams that undergo both compression and tension failures. Four specimens tested in a prior experimental study are modeled utilizing nonlinear finite element software ABAQUS, and numerical results are verified by comparison with experimental results. Contrary to existing nonlinear models, developed model accurately predicts damage pattern, descending portion of the load–displacement relationship, and ultimate displacement, which results in an accurate estimation of energy dissipation capacity and ductility. Moreover, a comprehensive parametric study is carried out to investigate the effect of tension reinforcement ratio, fiber volume fraction, fiber aspect ratio, and SFRC layer thickness on flexural behavior. Numerical results verify the improvement of beam flexural behavior by increasing SFRC layer thickness and indicate the significance of defining a minimum layer thickness. If the SFRC layer has a thickness lower than 40% of beam depth, there is only limited improvement in the behavior even for fibers with high aspect ratios. In contrast to SFRC beams, layered SFRC beams with up to 1.5% steel fibers exhibit a minor increase in the load carrying capacity, while ductility and energy dissipation capacity significantly improve with increasing layer thickness.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107637"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884396","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

An explicit topology and thickness control approach in SIMP-based topology optimization 基于simp的拓扑优化中的显式拓扑和厚度控制方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107631

Tongxing Zuo , Haitao Han , Qianglong Wang , Qiangwei Zhao , Zhenyu Liu

引用次数: 0

Advanced 3D Hamiltonian nodal position finite element method for nonlinear dynamic analysis of rotating solids 旋转固体非线性动力分析的先进三维哈密顿节点位置有限元方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107634

Fuzhen Yao , Chaofeng Li , Zheng H. Zhu

{"title":"Advanced 3D Hamiltonian nodal position finite element method for nonlinear dynamic analysis of rotating solids","authors":"Fuzhen Yao , Chaofeng Li , Zheng H. Zhu","doi":"10.1016/j.compstruc.2024.107634","DOIUrl":"10.1016/j.compstruc.2024.107634","url":null,"abstract":"<div><div>This paper develops a novel 3D brick element by Nodal Position Finite Element Method (NPFEM) to effectively model rotating solids. It uses nodal positions instead of nodal displacements to formulate element’s strain and kinetic energies. This approach effectively avoids computational errors caused by spurious strains induced by large rigid-body rotations and can automatically account for stiffening effects arising from centrifugal forces. By directly solving for the positions of rotating elastic solids using Hamiltonian canonical equations, the new 3D NPFEM brick element allows elastic deformation to be efficiently and accurately extracted by subtracting the rigid-body motion from these positions. Additionally, the ability of the new 3D NPFEM brick element to model bending deformation is enhanced by directly introducing incompatible modes into the element shape functions. Numerical validation shows that the new 3D NPFEM brick element accurately models and analyzes the elastic deformation of rotating blades. It automatically captures nonlinear frequency responses of rotating solids without requiring special boundary and loading condition treatments commonly used in classic FEM. This advancement offers significant advantages by avoiding errors when modeling complex rotating solids or machines, thereby improving computational efficiency and accuracy.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107634"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884392","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 refined aeroelastic beam finite element for the stability analysis of flexible subsonic wings 用于柔性亚音速机翼稳定性分析的精细化气动弹性梁有限元

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107618

Carmelo Rosario Vindigni , Giuseppe Mantegna , Calogero Orlando , Andrea Alaimo , Marco Berci

{"title":"A refined aeroelastic beam finite element for the stability analysis of flexible subsonic wings","authors":"Carmelo Rosario Vindigni , Giuseppe Mantegna , Calogero Orlando , Andrea Alaimo , Marco Berci","doi":"10.1016/j.compstruc.2024.107618","DOIUrl":"10.1016/j.compstruc.2024.107618","url":null,"abstract":"<div><div>In this work, a novel finite element approach for the computational aeroelastic analysis of flexible lifting structures in subsonic flow is presented. The numerical simulation of the fluid-structure interaction relies on the physical concept and mathematical formulation of an aeroelastic beam element, that is based on Euler-Bernoulli and De Saint-Venant theories for the structure dynamics and modified strip theory for the unsteady airload. An implementation of the unsteady vortex lattice method is used to correct standard strip theory in the time domain, considering the actual wing geometry and taking the aerodynamic effects of its sweep, aspect ratio and taper ratio into account. The effects of shed and trailed vorticity on the sectional load development and distribution are also accounted for, within a hybrid semi-analytical reduced-order aerodynamic model. Building on previous works, the present computational framework for aeroelastic modelling and simulations of flexible lifting structures is investigated and validated through a parametric stability assessment of swept tapered wings. The aeroelastic beam element proves to be an intuitive, reliable and efficient reduced-order tool, well suited for the preliminary multidisciplinary design and optimisation of flexible aircraft.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107618"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804461","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

Ground structure method-based stiffener layout topology optimization for horizontal machining center headstock cover plate 基于地面结构法的卧式加工中心主轴箱盖板加劲板布置拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107633

Hongyu Liu , Zheng Qiu , Jun Shi , Jianhong Sun , Song Zhang

{"title":"Ground structure method-based stiffener layout topology optimization for horizontal machining center headstock cover plate","authors":"Hongyu Liu , Zheng Qiu , Jun Shi , Jianhong Sun , Song Zhang","doi":"10.1016/j.compstruc.2024.107633","DOIUrl":"10.1016/j.compstruc.2024.107633","url":null,"abstract":"<div><div>Structural dynamic performance of a machine tool greatly affects machining precision and productivity. One effective approach in improving the dynamic performance is by applying topology design optimization to the machine tool structure. A method based on the Ground Structure Method (GSM) is established to optimize the layout of stiffener structure. The GSM is employed for the construction of the stiffener. The optimal layout of the stiffeners is obtained by optimizing the thickness of each stiffener and penalizing intermediate thicknesses to ensure a clear layout. A topology optimization method based on maximizing the natural frequency is established to achieve maximum natural frequency design of stiffener plate. Finally, a few examples are presented to demonstrate the efficacy of the proposed method in enhancing the basic frequency of the structure. The method has been effectively utilized in the optimal design of the machine tool headstock cover plate. As a result, the lowest six natural frequencies of the headstock are increased by 17.83 %, 17.88 %, 5.99 %, 5.58 %, 19.52 % and 14,53 %, respectively. The new approach outlined in this paper serves as a valuable reference for optimizing the dynamic characteristics of machine tools.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107633"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884047","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 space-time approach for the simulation of brittle fracture with phase-field models in elastodynamics 弹性动力学中相场模型模拟脆性断裂的时空方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107616

F.K. Feutang, S. Lejeunes, D. Eyheramendy

引用次数: 0

A framework for developing a machine learning-based finite element model for structural analysis 用于开发用于结构分析的基于机器学习的有限元模型的框架

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-01-15 DOI: 10.1016/j.compstruc.2024.107617

Gang Li, Rui Luo, Ding-Hao Yu

{"title":"A framework for developing a machine learning-based finite element model for structural analysis","authors":"Gang Li, Rui Luo, Ding-Hao Yu","doi":"10.1016/j.compstruc.2024.107617","DOIUrl":"10.1016/j.compstruc.2024.107617","url":null,"abstract":"<div><div>This paper presents a machine learning-based finite element construction method (MLBFE) to predict a precise strain field with minimal nodes. The method first establishes a standardized MLBFE model via the substructure concept and the static condensation method. Then, a training data collection method involving nodal displacements and strain fields, and considering (1) boundary continuity, (2) strain field continuity, and (3) the effect of rigid body motion, is developed. Furthermore, multivariate linear regression is adopted as the strain field prediction model for the MLBFE. The stiffness matrix and restoring forces of the MLBFE are calculated by employing the principle of virtual work and considering rigid body motion. Compared with common finite element models, the MLBFE enables refined structural simulation with fewer elements and nodes, reducing the number of degrees of freedom and computational costs. Moreover, the MLBFE exhibits high generalizability because it does not rely on specific structures or materials. This paper provides a detailed establishment of MLBFE-based planar elements and investigates the impact of the elemental settings on the computational accuracy of the elastic structural response. The ability of the MLBFE for nonlinear structural analysis is also verified.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"307 ","pages":"Article 107617"},"PeriodicalIF":4.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142804464","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