A two-scale contact model for collisions between blocks in CDEM

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	A two-scale contact model for collisions between blocks in CDEM
	Li SH(李世海); Tang DH(唐德泓); Wang J(王杰)
刊名	SCIENCE CHINA-TECHNOLOGICAL SCIENCES
	2015-09
通讯作者邮箱	tsinghtdh@126.com
卷号	58 期号:9 页码:1596-1603
关键词	two-scale contact model collision elastic wave element subdivision
ISSN号	1674-7321
通讯作者	Tang, DH (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China.
产权排序	[Li ShiHai; Tang DeHong; Wang Jie] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
中文摘要	Contact detection between interacting blocks is of great importance to discontinuity-based numerical methods, such as DDA, DEM, and NMM. A rigorous contact theory is a prerequisite to describing the interactions of multiple blocks. Currently, the penalty method, in which mathematical springs with high stiffness values are employed, is always used to calculate the contact forces. High stiffness values may cause numerical oscillations and limit the time step. Furthermore, their values are difficult to identify. The intention of this study is to present a two-scale contact model for the calculation of forces between colliding blocks. In this new model, a calculation step taken from the moment of contact will be divided into two time stages: the free motion time stage and the contact time stage. Actually, these two time stages correspond to two real physical processes. Based on this, we present a new numerical model that is intended to be more precise and useful in calculating the contact forces without mathematical springs. The propagation of the elastic wave during collision is of a characteristic length, which determines the volume of material involved in the contact force calculation. In conventional contact models, this range is always regarded as the length of one element, which may lead to an inaccurate calculation of contact forces. In fact, the real scale of this range is smaller than the length of a single element, and subdivided elements, which are refined according to the characteristic length and are presented in the new contact model.
分类号	二类/Q2
类目[WOS]	Engineering, Multidisciplinary ; Materials Science, Multidisciplinary
研究领域[WOS]	Engineering ; Materials Science
关键词[WOS]	DISCONTINUOUS DEFORMATION ANALYSIS ; NUMERICAL MANIFOLD METHOD ; DISTINCT ELEMENT MODEL ; ANALYSIS 3-D DDA ; MULTIBODY SYSTEMS ; POLYHEDRAL BLOCKS ; IMPACT ANALYSIS ; FORMULATION ; ALGORITHM
收录类别	SCI ; EI ; CSCD
原文出处	http://dx.doi.org/10.1007/s11431-015-5902-4
语种	英语
CSCD记录号	CSCD:5530189
WOS记录号	WOS:000360935100012
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/58425]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
推荐引用方式 GB/T 7714	Li SH,Tang DH,Wang J. A two-scale contact model for collisions between blocks in CDEM[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2015,58(9):1596-1603.
APA	Li SH,唐德泓,&王杰.(2015).A two-scale contact model for collisions between blocks in CDEM.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,58(9),1596-1603.
MLA	Li SH,et al."A two-scale contact model for collisions between blocks in CDEM".SCIENCE CHINA-TECHNOLOGICAL SCIENCES 58.9(2015):1596-1603.