考虑弹塑性本构的三维模态变形体离散元方法断裂模拟

(1. 清华大学水沙科学与水利水电工程国家重点实验室，北京 100084；2. 华东中建地产有限公司，上海 200122； 3. 中国水电顾问集团成都勘测设计研究院，四川，成都 610072)

详细信息

A FRACTURE SIMULATION USING 3-D MODE DISTINCT ELEMENT METHOD (3MDEM) WITH ELASTOPLASTIC CONSTITUTIVE MODEL

(1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; 2. China State Construction Property Corporation LTD (East China), Shanghai 200122, China; 3. Chengdu Hydroelectric Investigation & Design Institute of SPC, Chengdu, Sichuan 610072, China)

摘要: 三维模态变形体离散元(3MDEM)是针对离散块体系统在小应变、有限位移、有限转动条件下，用变形模态模拟块体变形，经过严格推导建立的一种离散元方法。该文在3MDEM平台实现对结构从弹性、到塑性再到断裂破坏的连续非连续全过程模拟。鉴于传统的接触破坏准则在塑性计算中的缺陷，该文提出基于塑性应变的接触破坏判断准则，并采用双块体的拉伸和剪切算例进行验证，结果较合理。最后将考虑弹塑性本构的3MDEM用于悬臂梁算例，模拟结构进入塑性和断裂破坏的连续非连续全过程。
- 模态离散元 /
- 数值方法 /
- 弹塑性 /
- 非连续 /
- 接触
Abstract: 3-D mode distinct element method (3MDEM) is a distinct element method under the assumption of small strain, finite displacement and finite rotation for blocks. The deformation of blocks is expressed as a combination of deformation modes in 3MDEM. In this paper, simulation from continuum to discontinuum including elastic-plastic-fracture is presented on 3MDEM platform. Due to the shortcoming of common criterion for contact fracture, a new criterion based on plastic strain is introduced, which is verified by two numerical examples. At last, a cantilever beam is studied from elastic to elastoplastic stage, and further to discontinuous fracture stage.
- mode distinct element method /
- numerical method /
- elastoplastic /
- discontinuum /
- contact