Computers & Structures最新文献_第2页

A modular and integrated on-board system for freight train condition monitoring: design approach and testing 货运列车状态监测的模块化集成车载系统：设计方法与测试

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-15 DOI: 10.1016/j.compstruc.2026.108109

F. Zanelli, A. Galimberti, N. Debattisti, S. Negri, G. Tomasini

Condition monitoring is becoming an essential tool in the railway industry, increasing the efficiency of vehicle maintenance. This is particularly critical in the case of freight trains since most wagons are still not equipped with sensors or wired. The proposed research work aims at developing a monitoring system with two main purposes: to apply to different wagon typologies and to be an integrated solution for the monitoring of the different mechanical subsystems of the vehicle. The focus is put on the energy harvesting to suitably power supply the wireless sensor nodes and on the performance enhancement for the identification of possible faults in the braking plant. The design of the monitoring system has been driven by an empirical model of the braking plant realized also to support the analysis of experimental data collected by the monitoring devices in the diagnostic stage. Moreover, a CFD analysis was performed to optimize energy harvesters (i.e. micro wind turbines) positioning on the wagon to enhance their efficiency. In the paper, it is shown how the numerical tools allowed to suitably design the wireless monitoring system, which is adopted in an experimental campaign aiming at collecting a database for the validation of condition monitoring algorithms.

状态监测正在成为铁路行业必不可少的工具，提高了车辆维修的效率。这在货运列车的情况下尤为重要，因为大多数车厢仍然没有配备传感器或有线。提出的研究工作旨在开发一种监测系统，其主要目的有两个：适用于不同类型的货车，并成为监测车辆不同机械子系统的综合解决方案。重点研究了能量收集，为无线传感器节点提供适当的电源，并提高了性能，以识别制动装置中可能出现的故障。监测系统的设计以制动装置的经验模型为驱动，实现了对监测装置在诊断阶段采集的实验数据的分析。此外，还进行了CFD分析，以优化能量收集器（即微型风力涡轮机）在货车上的定位，以提高其效率。在本文中，展示了数值工具如何允许适当地设计无线监测系统，该系统被用于一个旨在收集数据库以验证状态监测算法的实验活动中。

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引用次数: 0

New treatment of interfaces for 3D seismic wave propagation problem using generalized finite difference method 用广义有限差分法处理三维地震波传播问题的界面

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-15 DOI: 10.1016/j.compstruc.2026.108104

Jesús Flores Escribano, Eduardo Salete Casino, Juan José Benito Muñoz, Eduardo Conde López

Local surface sedimentary structures are made up of stacking strata. Layers of rock or sediment characterized by certain lithological properties that distinguish them from adjacent layers, separated by bedding planes here called interfaces. These strata are typically parallel, but their geometry can be complex, with inclined layers of variable thicknesses produced by tectonic movements or erosion processes. In this work, a formulation is proposed for the treatment of interfaces in seismic wave propagation problems with 3D domains using generalized finite difference method. This capacity is of great relevance, since it is the complexity of the soil structures what makes this meshless method interesting in comparison to the computationally efficient finite difference method. To validate the proposal, a set of examples are solved and their results are compared to those derived from analytical expressions or through finite element method models.

局部地表沉积构造是由堆积层构成的。具有一定岩性特征的岩层或沉积层，这些岩性特征使它们与相邻的岩层区别开来，被称为界面的层理平面隔开。这些地层通常是平行的，但它们的几何形状可能很复杂，由于构造运动或侵蚀过程产生了不同厚度的倾斜层。本文提出了用广义有限差分法处理三维地震波传播问题中界面的公式。这种能力是非常相关的，因为与计算效率高的有限差分方法相比，正是土壤结构的复杂性使这种无网格方法变得有趣。为了验证该方法的有效性，对一组算例进行了求解，并将其结果与解析表达式或有限元模型的结果进行了比较。

引用次数: 0

A finite deformation energy limiter-based rate-dependent gradient damage model for fracture analysis 基于有限变形能限制器的速率相关梯度损伤分析模型

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-09 DOI: 10.1016/j.compstruc.2025.108096

Tinh Quoc Bui , Hung Thanh Tran , Jaroon Rungamornrat

This paper details a new implicit gradient-enhanced damage model designed for simulating fracture in rubber-like materials under large or finite deformations. This model extends previous work by incorporating a rate-dependent crack propagation feature and reformulating the theory for finite strain contexts using a neo-Hookean hyperelastic model and an energy limiter concept. The methodology aims to create a stable and mesh-insensitive numerical tool for fracture analysis, which is implemented and solved using the Finite Element Method (FEM) with a staggered algorithm. Numerical examples validate the model’s accuracy, confirming its ability to predict complex crack growth and demonstrating the importance of the rate-dependent term for stabilizing simulations at large strains.

本文详细介绍了一种新的隐式梯度增强损伤模型，用于模拟橡胶类材料在大变形或有限变形下的断裂。该模型扩展了先前的工作，纳入了速率相关的裂纹扩展特征，并使用新胡克超弹性模型和能量限制器概念重新制定了有限应变环境下的理论。该方法旨在创建一个稳定且网格不敏感的断裂分析数值工具，并使用交错算法的有限元法（FEM）实现和求解。数值算例验证了该模型的准确性，证实了其预测复杂裂纹扩展的能力，并证明了速率相关项在大应变下稳定模拟的重要性。

引用次数: 0

Multiscale concurrent topology optimization for large-scale assembled structures 大型装配结构的多尺度并行拓扑优化

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-08 DOI: 10.1016/j.compstruc.2026.108098

Ran Zheng , Bing Yi , Gil Ho Yoon , Wenlong Liu , Long Liu , Xiang Peng

Although additive manufacturing has advantages in the fabrication of complicated structures and has been applied in many fields, large-scale structures often need to be partitioned into smaller components to comply with the size limitations of the printer, which compromises their overall structural performance. This paper presents a two-scale concurrent topology optimization method for multiple assembled structures, which can be fabricated with an additive manufacturing machine under maximum size limitations and further assembled via conventional joining processes. At the macroscale, the topology design of the macroscale structure and the partitioning of the overall structure into multiple components are realized by incorporating component size constraints into the Solid Isotropic Material with Penalization (SIMP) topology optimization framework. At the microscale, the topology of the self-connected microstructure unit located in the macroscale components and the bolted joint positions of the assembled microstructure unit located in the macroscale joints between different components are optimized based on the homogenization method. The smooth connection between the self-connected microstructure and the assembled microstructure is ensured by a geometric constraint. Finally, several numerical examples and a printing example are provided to illustrate the effectiveness of the proposed method, and the effects of some design parameters on the optimization results are analyzed.

虽然增材制造在制造复杂结构方面具有优势，并已在许多领域得到应用，但为了满足打印机的尺寸限制，大型结构往往需要被分割成更小的部件，从而影响其整体结构性能。本文提出了一种双尺度并行拓扑优化方法，该方法可以在最大尺寸限制下使用增材制造机制造多个组合结构，并通过传统连接工艺进行进一步组装。在宏观尺度上，通过将部件尺寸约束引入到SIMP拓扑优化框架中，实现了宏观结构的拓扑设计和整体结构的多部件划分。在微观尺度上，基于均质化方法对位于宏观尺度构件中的自连接微结构单元的拓扑结构和位于不同构件间宏观尺度节点中的装配微结构单元的螺栓连接位置进行了优化。通过几何约束保证了自连接微结构与装配微结构之间的平滑连接。最后，通过数值算例和打印算例说明了所提方法的有效性，并分析了一些设计参数对优化结果的影响。

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引用次数: 0

Thermo-mechanical fracture analysis of the bimaterials with a fully coupled peridynamic interface model 基于全耦合界面模型的双材料热-力学断裂分析

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-08 DOI: 10.1016/j.compstruc.2026.108105

Heng Zhang , Gaoyao Feng , Dan Huang , Ding Chen , Mengxin Liu

In this paper, a new fully coupled peridynamic thermo-mechanical interface model is proposed for the bimaterial fracture analysis with the perfect or imperfect material interface. First, a fully coupled peridynamic thermo-mechanical model is presented, in which a novel formation of the peridynamic free energy density is defined, and the peridynamic mechanical deformation model and heat conduction model with their coupling terms are systematically deduced. Then, the peridynamic thermo-mechanical coupled interface models are proposed for both perfect and imperfect interfaces, and corresponding bond failure criteria are given for the thermally induced interface fracture analysis. Four examples, i.e. a square plate under the shock tension loading, a bimaterial plate subjected to the heat flux, double layers beams (DLB) under the thermal loading, and three-point bending (TPB) tests of a bimaterial specimen, are analyzed with the proposed model and compared to the FEM and experimental solutions. The results show that the proposed model can well capture interaction characteristics of the heat conduction, mechanical deformation and crack growth of the bimaterial with the perfect or imperfect interface.

本文提出了一种新的全耦合周动力热-力学界面模型，用于具有完全或不完全材料界面的双材料断裂分析。首先，建立了全耦合的周动力热-力学模型，定义了一种新的周动力自由能密度形式，系统地推导了周动力力学变形模型和热传导模型及其耦合项。在此基础上，分别建立了完美界面和不完美界面的周动力热-力耦合界面模型，并给出了相应的粘结破坏准则，用于热致界面断裂分析。采用该模型对冲击拉伸载荷作用下的方形板、热流载荷作用下的双材料板、热载荷作用下的双层梁（DLB）和双材料试件的三点弯曲（TPB）试验4个实例进行了分析，并与有限元解和实验解进行了比较。结果表明，该模型能较好地反映界面完美或不完美双材料的热传导、力学变形和裂纹扩展等相互作用特性。

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引用次数: 0

A new meshfree method for accurate and efficient solutions to solid mechanics problems involving large deviatoric deformation, fracture, and fragmentation 一种新的无网格方法，用于精确和有效地解决涉及大偏差变形，断裂和破碎的固体力学问题

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-05 DOI: 10.1016/j.compstruc.2025.108095

Zhiyuan Tong, Mauricio Ponga

We present a novel meshfree method for accurate and efficient solutions to solid mechanics problems involving large deviatoric deformation, fracture, and fragmentation. Central to the approach is a newly developed meshfree shape function that satisfies the Kronecker delta property, exhibits first-order consistency, is non-negative, and achieves

C^{1}

smoothness. The formulation employs nodal integration which is desirable for problems with large topological changes. The combination of nodal integration and the Kronecker delta property leads to a naturally diagonal explicit equilibrium equation even in the presence of complex boundary and contact conditions. A key innovation is the introduction of shadow nodes, which, in conjunction with a local triangle removal strategy, enables the seamless handling of complex geometries and evolving discontinuities without explicit boundary representations. The method demonstrates excellent convergence and high accuracy across a range of linear and nonlinear benchmark problems. Its robustness and versatility are further illustrated through challenging simulations involving extreme fracture and fragmentation.

我们提出了一种新的无网格方法，用于精确和有效地解决涉及大偏差变形，断裂和破碎的固体力学问题。该方法的核心是一个新开发的无网格形状函数，该函数满足Kronecker delta性质，具有一阶一致性，非负，并实现C1平滑。该公式采用节点积分，这对于具有大拓扑变化的问题是理想的。即使在复杂的边界和接触条件下，节点积分和Kronecker δ性质的结合也可以得到一个自然的对角显式平衡方程。一个关键的创新是引入了阴影节点，它与局部三角形去除策略相结合，可以在没有明确边界表示的情况下无缝处理复杂的几何形状和不断发展的不连续。该方法在一系列线性和非线性基准问题上具有良好的收敛性和高精度。通过涉及极端断裂和破碎的挑战性模拟，进一步说明了其稳健性和通用性。

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引用次数: 0

Cycle-domain plasticity modeling using neural networks and symbolic regression 基于神经网络和符号回归的循环域塑性建模

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-02 DOI: 10.1016/j.compstruc.2025.108086

Nasrin Talebi, Knut Andreas Meyer, Magnus Ekh

Simulation of many loading cycles with traditional time-domain material models, requiring discretization of each cycle with several time steps, can result in high computational cost. One effective approach to speed up cyclic simulations is employing cycle-domain material models. Finite element simulations of rails subjected to many wheel passages are a relevant application of such models. Proposing a per-cycle evolution equation for plastic strains in cycle-domain models is, however, a challenge. To address this, we investigate the feasibility and accuracy of using machine learning models as tools for formulating such an equation. Specifically, we enforce our knowledge from constitutive modeling for elasticity and formulate the evolution law by employing feed-forward neural networks with different inputs, as well as symbolic regression to discover an interpretable expression. Training, validation, and test data have been generated using a cyclic time-domain plasticity model considering pulsating uniaxial stress loadings with constant and variable strain ranges. The obtained results demonstrate the potential of cycle-domain plasticity modeling using both uninterpretable and interpretable data-driven machine learning as an alternative to time-domain material modeling. Furthermore, both approaches have revealed reasonably good extrapolation performance beyond the training regime.

传统的时域材料模型在模拟多个加载周期时，需要用多个时间步对每个周期进行离散化，计算成本高。采用循环域材料模型是加快循环模拟的一种有效方法。多轮通道下轨道的有限元模拟是该模型的相关应用。然而，在循环域模型中提出塑性应变的每周期演化方程是一个挑战。为了解决这个问题，我们研究了使用机器学习模型作为制定这样一个方程的工具的可行性和准确性。具体来说，我们从弹性本构建模中获得知识，并通过使用具有不同输入的前馈神经网络以及符号回归来发现可解释的表达式来制定进化规律。训练、验证和测试数据是使用考虑恒定和可变应变范围的脉动单轴应力加载的循环时域塑性模型生成的。获得的结果表明，使用不可解释和可解释数据驱动的机器学习作为时域材料建模的替代方案，循环域塑性建模具有潜力。此外，两种方法都显示出相当好的外推性能，超出了训练制度。

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引用次数: 0

Cyclic constitutive model for masonry joint damage and energy dissipation using the distinct element method 用离散元法建立砌体节点损伤与耗能的循环本构模型

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-02 DOI: 10.1016/j.compstruc.2025.108094

Yopi P. Oktiovan , Francesco Messali , Bora Pulatsu , Satyadhrik Sharma , José V. Lemos , Jan G. Rots

This paper presents a cyclic joint constitutive model within a Distinct Element Method framework to simulate the in-plane response of unreinforced masonry structures. The model combines multi-surface failure criteria, including tensile cut-off, Coulomb friction, and an elliptical compression cap. It incorporates exponential softening, a unified damage scalar for stiffness degradation, and a hardening–softening law for compression. Shear-induced dilatancy is captured via an uplift-correction mechanism with an exponential dilatancy-decay law, while stiffness degradation governs energy dissipation. The model is validated at both material and structural scales. Material-level simulations of cyclic compression and shear tests show close agreement with experimental data. Structural-scale validation on full-height calcium-silicate walls under combined compression and cyclic lateral loading demonstrates the ability to reproduce rocking-dominated, shear-dominated, and hybrid failure mechanisms. The model successfully replicated global hysteretic force–drift loops, capturing stiffness decay and energy dissipation, as well as local failures like cracking, sliding, and toe crushing. The model also reproduced the drift-dependent transition from rocking to friction-controlled sliding, a key mechanism for earthquake assessment. By integrating these features into a single, efficient framework, the proposed constitutive model provides a robust tool for evaluating seismic performance and conserving heritage.

本文提出了一种基于离散元法框架的循环节理本构模型，用于模拟无加筋砌体结构的面内响应。该模型结合了多表面破坏准则，包括拉伸切断、库仑摩擦和椭圆压缩帽，并结合了指数软化、刚度退化的统一损伤标量和压缩的硬化-软化规律。剪切引起的剪胀是通过一个具有指数剪胀衰减规律的上升修正机制来捕获的，而刚度退化则控制着能量耗散。该模型在材料和结构两个尺度上都得到了验证。材料水平的循环压缩和剪切试验模拟结果与实验数据吻合较好。在压缩和循环侧向载荷联合作用下对全高硅酸钙壁进行结构尺度验证，证明了再现岩石主导、剪切主导和混合破坏机制的能力。该模型成功地复制了全局滞回力漂移回路，捕获了刚度衰减和能量耗散，以及局部破坏，如开裂、滑动和脚趾破碎。该模型还再现了从摇摆到摩擦控制滑动的漂移依赖转变，这是地震评估的关键机制。通过将这些特征整合到一个单一的、有效的框架中，所提出的本构模型为评估地震性能和保护遗产提供了一个强大的工具。

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引用次数: 0

Multi-patch isogeometric shape optimization of complex free-form surfaces with buckling constraints 具有屈曲约束的复杂自由曲面的多斑块等几何形状优化

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2026-01-02 DOI: 10.1016/j.compstruc.2025.108093

Ziling Song , Smriti , Sundararajan Natarajan , Tiantang Yu

Structural shape optimization plays a crucial role in finding aesthetically pleasing shape designs with reasonable mechanical performance. Isogeometric analysis offers a promising approach for such optimization due to its advantage of unifying the design and analysis models. This paper presents a comprehensive shape optimization methodology for free-form surfaces within isogeometric analysis framework, addressing both compliance and buckling problems. The analytical solution of Kirchhoff-Love shell is derived to enable efficient gradient-based optimization. For complex free-form surfaces modeled with multiple non-uniform rational B-spline (NURBS) patches, a gradient-free optimization strategy is employed to ensure robustness. Continuity constraints across multi-patch interfaces are enforced through Nitsche’s method. The proposed method is validated through several numerical examples, demonstrating simultaneous improvement in structural compliance and buckling stability.

结构形状优化对于找到美观且力学性能合理的结构形状设计至关重要。等几何分析以其统一设计模型和分析模型的优点，为此类优化提供了一种很有前途的方法。本文提出了一种在等几何分析框架下的自由曲面的综合形状优化方法，解决了柔度和屈曲问题。导出了Kirchhoff-Love壳的解析解，实现了基于梯度的高效优化。对于包含多个非均匀有理b样条（NURBS）斑块的复杂自由曲面，采用无梯度优化策略保证鲁棒性。通过Nitsche的方法，实现了跨多补丁接口的连续性约束。通过几个数值算例验证了该方法的有效性，表明该方法在结构柔度和屈曲稳定性方面同时得到了改善。

引用次数: 0

Analysis of friction-adhesion-buckling interactions in shell-like elastic structures via an isogeometric point-to-segment contact formulation 基于等几何点段接触公式的类壳弹性结构摩擦-粘着-屈曲相互作用分析

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-30 DOI: 10.1016/j.compstruc.2025.108092

Chunfa Wang , Libang Hu , Yudong Li , Hengxiao Lu , Yan Li , Han Hu , Zhiqiang Feng

Shell-like elastic structures—such as hemispherical shells and semi-cylinders—exhibit heightened susceptibility to buckling instability under axial compressive loading, a phenomenon particularly critical in confined assemblies, stacked components, or adhesive-bonded structures. In such practical engineering scenarios, frictional contact and adhesion interactions with adjacent objects emerge as pivotal factors influencing buckling behavior. These interfacial forces, stemming from localized contact pressures, confinement effects, or adhesive bonding, induce a complex coupling between contact mechanics and buckling phenomena, thereby fundamentally altering the structural response under compressive stress. To analyze these effects, we present a computational framework that integrates a point-to-segment (PTS) contact formulation and an exponential cohesive zone model for adhesion. This unified framework enables the simultaneous simulation of friction, adhesion, and buckling, including large deformations and sliding. Implemented on an in-house isogeometric analysis platform, the framework is rigorously validated against theoretical, experimental, and numerical benchmarks. Numerical experiments demonstrate its robustness under challenging conditions, revealing key bidirectional couplings: (1) friction and adhesion suppress buckling by resisting compressive stresses within the shell-like structures, thereby increasing the critical buckling load; (2) buckling-induced geometric nonlinearities dynamically alter contact areas and pressure distributions, which in turn modulate interfacial friction and adhesion strengths.

类壳弹性结构（如半球形壳和半圆柱体）在轴向压缩载荷下表现出更高的屈曲不稳定性，这种现象在受限组件、堆叠组件或粘合结构中尤为重要。在此类实际工程场景中，与相邻物体的摩擦接触和粘附相互作用成为影响屈曲行为的关键因素。这些由局部接触压力、约束效应或粘接引起的界面力诱导了接触力学和屈曲现象之间的复杂耦合，从而从根本上改变了压应力下的结构响应。为了分析这些影响，我们提出了一个计算框架，该框架集成了一个点对段（PTS）接触公式和一个指数黏附区模型。这个统一的框架可以同时模拟摩擦、粘附和屈曲，包括大变形和滑动。该框架在内部等几何分析平台上实现，经过理论、实验和数值基准的严格验证。数值实验证明了其在挑战性条件下的鲁棒性，揭示了关键的双向耦合：(1)摩擦和粘附通过抵抗类壳结构内部的压应力来抑制屈曲，从而增加了临界屈曲载荷；(2)屈曲引起的几何非线性动态改变了接触面积和压力分布，从而调节了界面摩擦和粘附强度。

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引用次数: 0