Computers & Structures最新文献_第3页

Insights into finite element simulations of semi-buried box structures under combined blast and fragment loads 爆炸和碎片综合荷载下半埋式箱形结构有限元模拟的启示

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-26 DOI: 10.1016/j.compstruc.2024.107486

{"title":"Insights into finite element simulations of semi-buried box structures under combined blast and fragment loads","authors":"","doi":"10.1016/j.compstruc.2024.107486","DOIUrl":"10.1016/j.compstruc.2024.107486","url":null,"abstract":"<div><p>This paper presents insights into the finite element (FE) simulation of semi-buried box structures under combined blast and fragment loads. Semi-buried box structures are important military protective structures of national and strategic importance and must withstand extreme loading threats from weapon detonations. Herein, the dynamic response of a semi-buried box structure with a blast door subjected to cased explosive charge detonations is investigated using the finite element simulation technique considering both blast and fragment loading. A series of analyses are performed using FE simulation software LS DYNA to estimate the intricate effects of two simultaneous cased charge detonations on the semi-buried box structure by varying the cased loading and point of fragment impact. At first, a comparative study of the semi-buried box structure with and without the protective sand layer is performed under different cased loading. Thereafter, the response of the semi-buried box structure with the protective sand layer is studied under different cased loading along with different points of fragment impacts. Results indicate that the present simulation technique is proficient in estimating the response of the semi-buried box structure under cased loading.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141954528","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 nonlinear interval finite element method for elastic–plastic problems with spatially uncertain parameters 针对空间参数不确定的弹塑性问题的非线性区间有限元方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-23 DOI: 10.1016/j.compstruc.2024.107476

引用次数: 0

Investigating the bending and buckling behaviors of composite porous beams reinforced with carbon nanotubes and graphene platelets using a TRPIM path following mesh-free approach 利用 TRPIM 路径跟踪无网格方法研究碳纳米管和石墨烯平板增强多孔复合梁的弯曲和屈曲行为

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-23 DOI: 10.1016/j.compstruc.2024.107492

{"title":"Investigating the bending and buckling behaviors of composite porous beams reinforced with carbon nanotubes and graphene platelets using a TRPIM path following mesh-free approach","authors":"","doi":"10.1016/j.compstruc.2024.107492","DOIUrl":"10.1016/j.compstruc.2024.107492","url":null,"abstract":"<div><p>The aim of the present work consists in investigating the nonlinear behavior of porous beams reinforced with graphene platelets (GPL) and supported carbon nanotubes (CNT), termed functionally graded graphene platelets reinforced composite beam (FG-GPLRC) and functionally graded nanotube carbon reinforced composite beam (FG-CNTRC), respectively. Notably, the distribution of GPL/CNT is explored in both uniform and non-uniform patterns across the beam's thickness. What sets this research apart is its utilization of a refined beam model as enhanced FSDT incorporating nonlinear shear terms which is a crucial advancement in accurately capturing the post-buckling response in certain boundary conditions, a feature lacking in the existing FSDT literature. Innovatively, the post-buckling load-deflection relationship is derived through the solution of governing equations incorporating cubic nonlinearity. This is achieved by employing Galerkin's method alongside a non-iterative high-order continuation technique based on the asymptotic numerical method coupled with the Tchebychev-radial point interpolation method (TRPIM), using a path-following where the solutions are obtained branch-by-branch by eliminating the need for iterative processes. In essence, this research underscores the pivotal role of porosity and GPL/CNT reinforcement in shaping the post-buckling configuration of both perfect and imperfect nanocomposite beams, thereby advancing our understanding of structural behavior in porous nanocomposite materials. The findings of this study illuminate the significant influence of parameters such as porosity coefficient, porosity distribution, GPL/CNT distribution, and GPL-weight/CNT-volume fraction on the nonlinear buckling behavior of porous beams.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141950091","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 issues in biaxial bending capacity assessment of RC and composite cross-sections exposed to fire 暴露于火灾中的钢筋混凝土和复合材料横截面双轴弯曲承载力评估中的计算问题

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-22 DOI: 10.1016/j.compstruc.2024.107477

{"title":"Computational issues in biaxial bending capacity assessment of RC and composite cross-sections exposed to fire","authors":"","doi":"10.1016/j.compstruc.2024.107477","DOIUrl":"10.1016/j.compstruc.2024.107477","url":null,"abstract":"<div><p>This paper introduces an advanced computational method for assessing the biaxial bending capacities of arbitrary-shaped reinforced concrete and steel–concrete composite cross-sections under fire conditions. The proposed approach involves a strain-driven iterative method coupled with an adaptive plastic centroid providing a “fail-safe” methodology by combining the bisection and damped Newton methods to improve its global convergence properties. Several key computational issues are addressed: (1) strength assessment criteria and its impact on computational outcomes, (2) the pathological behavior of local convergent iterative methods causing divergence or spurious solutions in stress-resultant space, (3) the softening behavior of concrete in compression affecting solution uniqueness and interaction diagram convexity, (4) non-planar vertical interaction diagrams induced by a mobile centroid, and (5) computational challenges related to solution non-uniqueness or non-existence in <em>M-M</em> stress resultant space when axial force falls outside the <em>iso</em>-load contour. An additional notable feature and novelty of the proposed method lie in its unique capability to assess true plane vertical interaction diagrams enabling also both ultimate and nominal strength assessment. Validation includes comparisons with other numerical results and experimental data from international literature, extending the benchmark results for the strength capacity assessment of composite cross-sections exposed to high temperatures.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924002062/pdfft?md5=f3bf5c98493cc9487529e7006fde08ee&pid=1-s2.0-S0045794924002062-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141959435","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

Energy-based homogenization method for lattice structures with generalized periodicity 针对具有广义周期性的晶格结构的基于能量的均质化方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-19 DOI: 10.1016/j.compstruc.2024.107478

引用次数: 0

Multi-material topology optimization of phononic crystal considering isotropic/anisotropic materials 考虑各向同性/各向异性材料的声波晶体多材料拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-19 DOI: 10.1016/j.compstruc.2024.107479

引用次数: 0

Design-informed generative modelling of skeletal structures using structural optimization 利用结构优化技术为骨骼结构建立设计信息生成模型

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-18 DOI: 10.1016/j.compstruc.2024.107474

{"title":"Design-informed generative modelling of skeletal structures using structural optimization","authors":"","doi":"10.1016/j.compstruc.2024.107474","DOIUrl":"10.1016/j.compstruc.2024.107474","url":null,"abstract":"<div><p>Although various structural optimization techniques have a sound mathematical basis, the structural robustness and practical constructability of optimal designs pose a great challenge in the manufacturing stage. This paper presents an automated novel approach stemming from structural optimization and engineering principles, where discrete members of the structurally optimized designs are driven towards optimal utilization. The developed workflow unifies topology, layout and size optimization in a single parametric platform, which subsequently outputs a ready-to-manufacture CAD skeletal model which can be manufactured either additively or by assembly. All such outputs are checked and validated for structural requirements; strength, stiffness and stability in accordance with standard codes of practice. In the implementations, first, a topology-optimal model is generated and converted to a one-pixel-wide chain model using skeletonization. Herein, this paper uses a novel efficient method to extract the skeleton by using pixel-padding near the domain borders. Secondly, a spatial frame is extracted from the skeleton for its member size and layout optimization. Finally, the CAD model is generated using constructive solid geometry trees and the structural integrity of each member is assessed to ensure structural robustness prior to manufacturing. Various examples presented in the paper showcase the validity of the presented workflow across various structural engineering applications.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141637695","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 topology optimization of structure weakly coupled with two-phase flow 弱耦合两相流结构的动态拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-17 DOI: 10.1016/j.compstruc.2024.107471

{"title":"Dynamic topology optimization of structure weakly coupled with two-phase flow","authors":"","doi":"10.1016/j.compstruc.2024.107471","DOIUrl":"10.1016/j.compstruc.2024.107471","url":null,"abstract":"<div><p>This study presents a new topology optimization method for transient two-phase fluid-structure interaction (FSI) problem. From a topology optimization point of view, it is formidable challenging to consider the mutual coupling with structure and two-phase flow and the evolution of sharp interface between two-phase flow (tracking interface). To tackle these formidable issues, the monolithic design approach incorporating with the deformation tensor is applied and the simulation of the two-phase flow is carried out with the volume of fluid (VOF). The spatially varying design variables in topology optimization determines whether the corresponding domains or elements are solid or fluid (two-phase flow) to maximize or minimize objective function. To simplify the coupling procedure and maintain the numerical convergence, the one-way coupling between two-phase fluid and structure is assumed rather than the two-way coupling. To carry out the topology optimization, the Darcy's force determined by the design variable is added to the Navier-Stokes equation and the Young's modulus and the structural density are also interpolated with respect to the design variables. In addition, the phase-field equation in the VOF method is also modified to take into account the evolution of the design variable and the front of the phase field value. To investigate the effect of the two-phase fluid-structure interaction, several transient two-dimensional problems are considered.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141637694","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

Improving stability in hybrid fire testing: Advancements in analysis method and software implementation 提高混合火灾试验的稳定性：分析方法和软件实施的进步

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-16 DOI: 10.1016/j.compstruc.2024.107473

{"title":"Improving stability in hybrid fire testing: Advancements in analysis method and software implementation","authors":"","doi":"10.1016/j.compstruc.2024.107473","DOIUrl":"10.1016/j.compstruc.2024.107473","url":null,"abstract":"<div><p>In large-scale structural fire resistance tests, the interaction between the individual elements and the surrounding structure causes discrepancies in behaviour compared to single-element fire tests. Large-scale tests of real structures are challenging due to financial and time limitations. To bridge this gap, the concept of “Hybrid Fire Testing (HFT)” emerges, where a portion of the structural system (i.e., physical substructure) is experimentally tested while the remaining structure (i.e., numerical substructure) is analyzed numerically. The primary challenges in HFT involve ensuring stability throughout the analysis by considering the varying stiffness of the fire-exposed element during the test and establishing a versatile communication platform between the physical substructure (PS) and numerical substructure (NS) components. This paper presents a comprehensive HFT framework, implemented within a user-friendly software interface, facilitating both virtual and experimental testing. The software incorporates a new method addressing stability concerns by predicting PS stiffness during the test, achieving convergence within a limited number of iterations. Additionally, the framework includes a communication platform utilizing internet protocols (IP) and COM ports for rapid and easy connection to diverse experimental control systems and finite element software packages. The functionality of the developed software is validated through its successful application in an HFT conducted on a 3-story steel structure within a simulated environment. Both force-controlled and displacement-controlled approaches confirm the method’s adaptivity to the employed test procedures.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924002025/pdfft?md5=5ac2702d8f4536f6fb764a57eff1c068&pid=1-s2.0-S0045794924002025-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141629991","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

Homogenized model of peristaltic deformation driven flows in piezoelectric porous media 压电多孔介质中蠕动变形驱动流动的均质化模型

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-07-16 DOI: 10.1016/j.compstruc.2024.107470

{"title":"Homogenized model of peristaltic deformation driven flows in piezoelectric porous media","authors":"","doi":"10.1016/j.compstruc.2024.107470","DOIUrl":"10.1016/j.compstruc.2024.107470","url":null,"abstract":"<div><p>The paper presents a new type of weakly nonlinear two-scale model of controllable periodic porous piezoelectric structures saturated by Newtonian fluids. The flow is propelled by peristaltic deformation of microchannels which is induced due to piezoelectric segments embedded in the microstructure and locally actuated by voltage waves. The homogenization is employed to derive a macroscopic model of the poroelastic medium with effective parameters modified by piezoelectric properties of the skeleton. To capture the peristaltic pumping, the nonlinearity associated with deforming configuration must be respected. In the macroscopic model, this nonlinearity is introduced through homogenized coefficients depending on the deforming micro-configurations. For this, linear expansions based on the sensitivity analysis of the homogenized coefficients with respect to deformation induced by the macroscopic quantities are employed. This enables to avoid the two-scale tight coupling of the macro- and microproblems otherwise needed in nonlinear problems. The derived reduced-order model is implemented and verified using direct numerical simulations of the periodic heterogeneous medium. Numerical results demonstrate the peristaltic driven fluid propulsion in response to the electric actuation and the efficiency of the proposed treatment of the nonlinearity. The paper shows new perspectives in homogenization-based computationally efficient modelling of weakly nonlinear problems where continuum microstructures are perturbed by coupled fields.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141623533","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