Improvement of contact calculation in spherical discontinuous deformation analysis

Improvement of contact calculation in spherical discontinuous deformation analysis
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球形不连续变形分析中接触计算的改进

DOI:
10.1007/s11431-016-0203-6
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发表时间:
2017-01
期刊:
Science in China - Series E: Technological Sciences
影响因子:
--
通讯作者:
Tan Fei
Tan Fei
中科院分区:
其他
文献类型:
--
作者:
Wang Long;Jiao YuYong;Huang GangHai;Zheng Fei;Zhao Zhiye;Tan Fei

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非连续变形分析(DDA)方法是一种新发展起来的离散元方法,它采用隐式时间积分法求解控制方程,采用开闭迭代法处理接触问题,计算效率相对较低。而基于球面单元的非连续变形分析(SDDA),由于采用了点-点接触等简单的接触方式,计算速度更快。在SDDA框架下,通过去掉OCI格式,采用最大位移增量(MDI),提出了一种非常简单的接触计算方法。通过算例验证了该方法的正确性和有效性,并获得了较高的计算效率。
Discontinuous deformation analysis (DDA) method is a newly developed discrete element method which employs the implicit time-integration scheme to solve the governing equations and the open-close iteration (OCI) method to deal with contact problem, its computational efficiency is relatively low. However, spherical element based discontinuous deformation analysis (SDDA), which uses very simple contact type like point-to-point contact, has higher calculation speed. In the framework of SDDA, this paper presents a very simple contact calculation approach by removing the OCI scheme and by adopting the maximal displacement increment (MDI). Through some verification examples, it is proved that the proposed method is correct and effective, and a higher computational efficiency is obtained.
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