| 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); Tang, DH (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China.
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| 发表期刊 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
 |
| 2015-09
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| 卷号 | 58期号:9页码:1596-1603 |
| ISSN | 1674-7321
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| 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. |
| 关键词 | Two-scale
Contact Model
Collision
Elastic Wave
Element Subdivision
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| DOI | 10.1007/s11431-015-5902-4
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| URL | 查看原文
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| 收录类别 | SCI
; EI
; CSCD
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| 语种 | 英语
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| WOS记录号 | WOS:000360935100012
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| 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
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| WOS研究方向 | Engineering
; Materials Science
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| WOS类目 | Engineering, Multidisciplinary
; Materials Science, Multidisciplinary
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| 项目资助者 | This work was supported by the National Basic Research Program of China ("973" Project) (Grant No. 2015CB250903), the CAS Strategic Priority Research Program (B) (Grant No. XDB10030303), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2012BAK10B01), and the Youth Science Fund of the National Natural Science Foundation of China (Grant No. 11302230).
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| CSCD记录号 | CSCD:5530189
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| 课题组名称 | LMFS工程地质体力学(LEM)
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| 论文分区 | 二类/Q2
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/58425
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| 专题 | 流固耦合系统力学重点实验室
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| 通讯作者 | Tang, DH (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China. |
推荐引用方式
GB/T 7714 |
Li SH,Tang DH,Wang J,et al. A two-scale contact model for collisions between blocks in CDEM[J]. SCIENCE CHINA-TECHNOLOGICAL SCIENCES,2015,58,9,:1596-1603.
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| APA |
Li SH,唐德泓,王杰,&Tang, DH .(2015).A two-scale contact model for collisions between blocks in CDEM.SCIENCE CHINA-TECHNOLOGICAL SCIENCES,58(9),1596-1603.
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| 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.
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