检索结果-内蒙古大学图书馆

contact algorithm of the material point method and comparison with the finite element method

COMPUTATIONAL GEOSCIENCES 2024年第6期28卷 1015-1030页

作者： Huang, Peng Liu, Dong-huan Guo, Hu Xie, Ke Zhang, Qing-ping Deng, Zhi-fang China Acad Engn Phys Inst Syst Engn Mianyang 621900 Peoples R China Univ Sci & Technol Beijing Sch Math & Phys Beijing Key Lab Magneto Photoelect Composite & Int Beijing 100083 Peoples R China

Being a fully Lagrangian particle method, the material point method (MPM) discretizes a material domain by using a collection of material points. The momentum equations in MPM are solved on a predefined regular background grid, so that the grid distortion and entanglement are completely avoided in MPM. The contact algorithm of MPM is developed via the background grid and the impenetrability condition between bodies. The contact algorithm of MPM is applied to solve some impact and perforation problems. This study concerns the validation of the contact algorithm of MPM. Solutions from MPM with the contact algorithm are compared to those from the finite element method (FEM) with the penalty method. For two impact problems, the results from MPM with the contact algorithm are in good agreement with those obtained with the FEM penalty method. For the perforation problem of aluminum plate, the results obtained using MPM with the contact algorithm are better than those from the FEM penalty method. We think that for impact problems without extreme large deformations, it is better to use the FEM penalty method. For impact problems with extreme large deformations, it is better to use the contact algorithm of MPM.

关键词： Material point method contact algorithm Finite element method Impact problems

来源：评论

学校读者我要写书评

暂无评论

Proposal of a coupled DDA-SPH method incorporating a new contact algorithm for soil-structure interaction simulations in geotechnical hazards

引用

COMPUTERS AND GEOTECHNICS 2023年 164卷

作者： Peng, Xinyan Yu, Pengcheng Zhu, Hui Cheng, Xiao Zhang, Yingbin Li, Changze Sichuan Univ Inst Disaster Management & Reconstruct MOE Key Lab Deep Earth Sci & Engn Chengdu Peoples R China Southwest Jiaotong Univ Sch Civil Engn Dept Geotech Engn Chengdu Peoples R China Kyoto Univ Disaster Prevent Res Inst Kyoto Japan

Accurate description of soil-structure interaction problems in geotechnical hazards is challengeable. A coupled method is a potential approach to solve such problems. Discontinuous deformation method (DDA) can be used to describe structure behavior and smoothed particle hydrodynamics (SPH) suits well for capturing soil behavior;meanwhile, the coupled DDA-SPH method can simulate complex soil-structure interaction through a contact algorithm. In the original contact algorithm, a penalty method using the Mohr-Coulomb failure criterion is utilized to embody the interaction forces. However, five calculation parameters are involved and should be chosen carefully. Moreover, the energy dissipation cannot be considered quantitatively and suitably. To overcome these drawbacks, a new contact algorithm is proposed in this study. This new contact algorithm can consider the friction and energy dissipation at contacts between DDA blocks and SPH particles using two physical parameters (including the interface friction angle and coefficient of restitution). Several validation examples were carried out to investigate the performance of the newly coupled DDA-SPH method. The simulated results were compared with theoretical solutions or those obtained by other different numerical methods, which shows good agreements. This suggests that the newly coupled DDA-SPH method can be applied to conduct the soilstructure interaction simulations with ease.

关键词： Soil-structure interaction Discontinuous deformation method (DDA) Smoothed particle hydrodynamics (SPH) Coupled method contact algorithm Energy dissipation

来源：评论

学校读者我要写书评

暂无评论

An improved 3D multi-sphere DE-FE contact algorithm for interactions between an off-road pneumatic tire and irregular gravel terrain

引用

COMPUTATIONAL PARTICLE MECHANICS 2023年第1期10卷 97-120页

作者： Guo, Xiaobing Zheng, Zumei Chen, Shunhua Zang, Mengyan South China Univ Technol Sch Mech & Automot Engn 381 Wushan RD Guangzhou 510641 Peoples R China Qilu Univ Technol Shandong Acad Sci Sch Mech Engn Jinan 250353 Peoples R China Sun Yat Sen Univ Sch Marine Engn & Technol Zhuhai 519082 Peoples R China Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China

The traveling analysis of an off-road tire on granular terrain is a typical application of contact interaction problems between structures and granular particles. In previous studies, extensive efforts normally idealized irregular gravel materials using spherical discrete elements (DEs), and the influence of irregular shapes was ignored. In our recent works, a coupling algorithm that used a multi-sphere model to accurately represent irregular gravel particles in the context of tire-terrain interactions was proposed. However, this algorithm suffers from low computational efficiency for contact interactions. To address this issue, this work develops a robust and efficient contact algorithm to handle the complex interactions between multi-sphere DEs and finite element segments for tire traveling analysis. The advantages of the presented algorithm are three-folded. Firstly, a rectangular dynamic contact domain is reconstructed to reduce the computational cost in the global searching phase with the use of an efficient multi-grid algorithm. Secondly, we use virtual bounding spheres instead of virtual bounding boxes for hexahedral FE segments to reduce memory storage. Thirdly, a numerical treatment is developed to deal with multi-point contact problems between multi-sphere DEs and FE segments using an inside-outside algorithm in the local searching phase. Finally, the traveling behavior of two off-road tires on multi-sphere gravel terrain using our proposed algorithm is simulated, and the robustness, accuracy and efficiency of the presented algorithm is demonstrated via an indoor soil-bin data.

关键词： Multi-sphere particle contact algorithm DE-FE coupling method Tractive performance Soil-bin experiment

来源：评论

学校读者我要写书评

暂无评论

contact algorithm for Material Point Method With Beam-Column Elements

引用

Journal of Chinese Soil and Water Conservation 2024年第3期55卷 154-161页

作者： Lin, Yu-Ting Yang, Wen-Chia Department of Civil Engineering National Chung Hsing University Taichung Taiwan

The Material Point Method (MPM) performs well in simulating large deformations of continua, such as debris flows. However, when structural components are involved in simulations, the grid sizes of the simulated continua are often overly coarse relative to the structural elements, which increases the difficulty of accurately assessing the internal stresses of the structural members. Thus, this study introduces beam-column elements into the MPM, leveraging beam theory to improve the accuracy of stress calculations. The beam-column elements and the MPM are integrated using a two-stage contact algorithm. In the first stage, the beam-column elements are treated as velocity boundary conditions in the MPM to obtain nodal boundary forces, and in the second stage, these forces are used to update the states of both the beam-column elements and the MPM-simulated continua. Numerical experiments reveal that although the proposed projection-point-searching algorithm is less efficient under large displacements, the use of beam-column elements can prevent shear locking and enhance the accuracy of the internal flexural stress field of the structural members in MPM simulations. Moreover, simulations involving beam-column elements are significantly more efficient than particle-based simulations of structural members. © 2024 Chinese Soil and Water Conservation Society. All rights reserved.

关键词： beam theory beam-column elements contact algorithm Material point method

来源：评论

学校读者我要写书评

暂无评论

Implementation of three-dimensional contact algorithm in numerical manifold method for the structural impact simulation

引用

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 2024年 193卷

作者： Ouyang, Qiumeng Zhuang, Xiaoying Rabczuk, Timon Ning, Youjun Kang, Ge Chen, Pengwan Beijing Inst Technol Stake Key Lab Explos Sci & Technol Beijing 100081 Peoples R China Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China Leibniz Univ Hannover Chair Computat Sci & Simulat Technol Appelstr 11 D-30167 Hannover Germany Bauhaus Univ Weimar Inst Struct Mech D-99423 Weimar Germany Southwest Petr Univ Sch Mech Engn Chengdu 610500 Sichuan Peoples R China

Structural impact often accompanies large amounts of contacts and leads to complex mechanical phenomena. In solid mechanics, the numerical manifold method (NMM) is proposed to address problems featuring continuousdiscontinuous transitions by utilizing a dual coverage system encompassing both mathematical and physical covers. In the present work, a penalty contact algorithm for 3DNMM based on cover-based contact theory is programmed and applied to impact mechanics problems. The accuracy of the developed contact algorithm is firstly calibrated through free-falling blocks and collision blocks. The influence of contact parameters on contact convergence is systematically studied, and three preliminary criteria for how to set contact parameters are provided. The effectiveness of the contact algorithm is verified by conserving system momentum during block collisions. Subsequently, the contact algorithm is applied to Taylor rod and car-streetlight impact simulation, further confirming its effectiveness in modeling high-speed collisions, large displacements, and large deformations of structures. By comparing the 3DNMM results with those from Abaqus, the contact algorithm developed here performs exceptionally well in solving collision problems and produces results consistent with commercial software. The research results in the present work verify the applicability and accuracy of the proposed contact algorithm in solving structural dynamic impact problems. The present work also provides guidance for contact parameter setting in impact problems.

关键词： Numerical manifold method 3D-NMM contact cover contact algorithm Impact problem

来源：评论

学校读者我要写书评

暂无评论

A critical assessment and contact algorithm for the staggered grid material point method

引用

INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN 2021年第4期17卷 743-766页

作者： Kan, Lei Liang, Yong Zhang, Xiong Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China Univ Calif Berkeley Dept Civil & Environm Engn Berkeley CA 94720 USA

The material point method (MPM) has demonstrated itself as an effective numerical method to simulate extreme events with large deformations. However, the original MPM suffers several defects caused by the particle quadrature, including cell crossing noise, low spatial integration accuracy, and loss of spatial convergence. Our newly developed staggered grid material point method (SGMP) employs the cell center quadrature to efficiently eliminate the cell crossing noise and to recover the spatial convergence. In this paper, the SGMP is further formulated with the updated stress last, updated stress first and modified updated stress last schemes. The energy errors of the SGMP with different schemes are derived analytically to study their accuracy and stability. The performance of the SGMP is critically assessed by investigating its performance in terms of convergence, stability, dissipation and efficiency theoretically and numerically. This study shows that the SGMP performs much better than the MPM. In addition, a contact algorithm is also developed for the SGMP to model the contact-impact problems, and is verified by several numerical examples.

关键词： Material point method Staggered grid Energy error contact algorithm

来源：评论

学校读者我要写书评

暂无评论

A First Violation contact algorithm that Correctly Captures History Dependence

引用

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2021年 198卷 106375-106375页

作者： Chauda, Gaurav Segalman, Daniel J. Michigan State Univ Mech Engn E Lansing MI 48824 USA

Problems of elastic frictional contact are of great engineering relevance playing major roles in many fields such as tribology, attachment integrity, and even structural dynamics. These problems are historically extremely difficult to analyze either theoretically or numerically. A quick review of the literature provides insight as to a major cause of the numerical difficulty specifically that traditional algorithms search for contact solutions that satisfy all equality and inequality constraints using iterative processes that pass through states that do not satisfy those constraints and are physically inadmissible. A novel contact algorithm the Method of First Violation is introduced to address the deficiency identified in traditional methods by choosing load steps precisely so as to avoid iterations through inadmissible states. The new algorithm is demonstrated on multiple contact problems and the results compared to those of a conventional algorithm and to analytic solutions where available. Finally, the Method of First Violation is demonstrated on a contact problem with a nontraditional friction model (Dahls model) to demonstrate generality and robustness.

关键词： contact algorithm Stick-Slip Dry Friction Coulomb Friction Elastic Compliance contact Path Dependence

来源：评论

学校读者我要写书评

暂无评论

Adapting a contact-mechanics algorithm to predict damping in bolted joints using quasi-static modal analysis

引用

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2021年 189卷 105982-105982页

作者： Zare, Iman Allen, Matthew S. Univ Wisconsin Dept Engn Phys Madison WI 53705 USA

While a bolted joint can be modeled in commercial FE codes, even quasi-static analysis is extremely expensive due to the level of detail required to capture slip at the bolt interface. This is even worse for 3D cases where the solver must deal with the two-dimensional friction problem, making convergence more expensive. In order to address this issue, we present a quasi-static algorithm that greatly accelerates the analysis of 2D and 3D problems. This algorithm uses static reduction along with a new numerical method which is a hybrid between Block-Gauss-Seidel and Newton-Rhapson. A relaxed form of 2D frictional problem is presented in this algorithm which increases the efficiency of the method. In order to evaluate the performance of the algorithm, we apply the method to perform QSMA on 2D and 3D cases. QSMA uses a series of static loadings to predict the effective natural frequency and damping of each mode of a bolted structure as a function of vibration amplitude. In the cases studied here the algorithm resulted in dramatic computational savings while providing good accuracy as compared to simulations in commercial finite element software, both for the effective natural frequencies and damping and for the contact pressure distributions. To explore the robustness of the algorithm, the mesh density, preloads, and quasi-static force amplitudes are explored. The effect of the size of the reduced model on the accuracy of the result and the efficiency of the method is investigated in this paper.

关键词： Bolted joints Block Gauss Seidel contact algorithm Quasi-static Nonlinear damping Coulomb friction

来源：评论

学校读者我要写书评

暂无评论

A Laminated Ring on Elastic Foundation Model and a Feedback contact algorithm for Tire-Road contact Analysis

引用

TIRE SCIENCE AND TECHNOLOGY 2017年第4期45卷 307-334页

作者： Wang, Chunjian Ayalew, Beshah Rhyne, Timothy Cron, Steve Adcox, John Clemson Univ Int Ctr Automot Res CGEC 4 Res DrRoom 342 Greenville SC 29607 USA Michelin Amer Res Corp 515 Michelin Rd Greenville SC 29605 USA

This article proposes (1) a two-dimensional tire model that extends the deformable ring on elastic foundation (REF) model by treating the ring as a laminated beam and (2) a feedback compensation approach to solve the tire-road contact problem as facilitated by the laminated REF model. The internal layer of the laminated ring is formulated using the Timoshenko beam theory that can also be easily regressed to an Euler beam. The external layer of the laminated ring is modeled as a circular beam that primarily takes into account the strain energy contributed by the tire tread in the transverse or radial direction. The elastic foundations are assumed to have a predeformation in the radial direction, which can model tire inflation pressure in pneumatic tires or foundation precompression/pretension for nonpneumatic tires. The analytical solution for the static deformation response of this laminated REF model due to an arbitrary external force is detailed first. Then, a feedback p-controller algorithm that penalizes geometry errors in the contact region is outlined as a unified approach that can be used to solve frictionless contact problems between a tire and arbitrary road profiles. The performances of the proposed model and algorithm are compared against those obtained from a detailed finite element analysis. Both flat surface and cleat contact responses are shown to illustrate the utility of this laminated REF model and the contact algorithm.

关键词： ring on elastic foundation (REF) laminated ring model Timoshenko beam tire-road contact feedback compensation contact algorithm

来源：评论

学校读者我要写书评

暂无评论

Adhesive contact algorithm for MPM and its application to the simulation of cone penetration in clay 1

Adhesive contact algorithm for MPM and its application to th...

引用

1st International Conference on the Material Point Method (MPM)

作者： Ceccato, Francesca Beuth, Lars Simonini, Paolo Univ Padua DICEA Via Ognissanti 39 I-35129 Padua Italy Deltares Delft Netherlands

contact between bodies is one of the most challenging problems to solve, especially when combined with large deformations. For MPM, several methods have been developed to simulate frictional contact, i.e. shear stress is proportional to the normal stress via a friction coefficient;however, for cohesive soils under undrained conditions the interface shear stress is more likely a function of the undrained shear strength and independent of the normal stress (adhesive contact). This paper presents the extension of one of the most widely used contact algorithms in MPM for adhesive contact. This enhanced formulation is validated with a sliding block benchmark and applied to the simulation of cone penetration testing (CPT) in clay. CPT is an in situ test commonly used in geoengineering to determine the subsoil's stratigraphy and to estimate soil parameters. It is shown that the adhesion at the cone-soil interface affects significantly the measured cone resistance. Numerical results are compared with available analytical and experimental studies, showing the effectiveness of the proposed method to describe undrained penetration in clay. (C) 2016 The Authors. Published by Elsevier Ltd.

关键词： contact algorithm CPT adhesive contact

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：