Research Article

Frontiers of Structural and Civil Engineering

, Volume 6, Issue 1, pp 57-68

3D mode discrete element method with the elastoplastic model

  • Wei HuAffiliated withState Key Laboratory of Hydroscience and Engineering, Tsinghua UniversityChina State Construction Property Corp. Ltd.
  • , Feng JinAffiliated withState Key Laboratory of Hydroscience and Engineering, Tsinghua University Email author 
  • , Chong ZhangAffiliated withChengdu Hydroelectric Investigation & Design Institute of SPC
  • , Jinting WangAffiliated withState Key Laboratory of Hydroscience and Engineering, Tsinghua University

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Abstract

The three-dimensional mode-deformable discrete element method (3MDEM) is an extended distinct element approach under the assumptions of small strain, finite displacement, and finite rotation of blocks. The deformation of blocks is expressed by the combination of the deformation modes in 3MDEM. In this paper, the elastoplastic constitutive relationship of blocks is implemented on the 3MDEM platform to simulate the integrated process from elasticity to plasticity and finally to fracture. To overcome the shortcomings of the conventional criterion for contact fracturing, a new criterion based on plastic strain is introduced. This approach is verified by two numerical examples. Finally, a cantilever beam is simulated as a comprehensive case study, which went through elastic, elastoplastic, and discontinuous fracture stages.

Keywords

mode discrete element method elastoplastic numerical method discontinuum contact