会议专题

Integrated Damage Mechanics Approach to Brittle and Ductile Crack Propagation

  With decreasing temperature the failure of typical engineering metals changes from ductile fracture to cleavage.A possible cleavage initiation in the brittle-ductile transition region is typically evaluated by stress-based criteria like those after Ritchie-Knott-Rice or of Weibull-type.Such models describe the experimental results adequately in the lower brittle-ductile transition region but problems arise in the upper part of the transition region.In the present study cleavage is modeled by a cohesive zone and ductile damage is described by a non-local Gurson-model.With this modeling of both failure mechanisms the fracture initiation and propagation can be simulated in the whole brittle transition region.The results show that the crack tip constraint has a considerable influence on the stability of the crack propagation.

fracture mechanics brittle-ductile transition non-local Gurson model FEM simulation

Geralf Hütter Thomas Linse Uwe Mühlich Meinhard Kuna

Institute of Mechanics and Fluid Dynamics,TU Bergakademie Freiberg,09596 Freiberg,Germany Institute of Solid Mechanics,TU Dresden,01062 Dresden,Germany

国际会议

第13届国际断裂大会(ICF2013)

北京

英文

1-8

2013-06-16(万方平台首次上网日期,不代表论文的发表时间)