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

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.