Simulation of Crack Tip Stress Fields in Elastic-Plastic FCC Single Crystals

Guilherme Fiorin Fornel¹; Eduardo Bittencourt¹; Rafael Luis Moresco¹

¹ Universidade Federal do Rio Grande do Sul

doi:10.20906/CPS/CILAMCE2017-0383

Resumo

In this work, stress fields at the crack tip in FCC (face-centered cubic) metals considering the elastic-plastic behavior of the crystalline microstructure are obtained numerically and compared with the analytical solutions proposed by Rice (1987) and Drugan (2001). It is assumed that the crack tip is inserted into a grain (single crystal), disregarding the effect of adjacent grains. It is considered a two-dimentional geometry, with the single crystal oriented at plane (1-10) and blocked strains in the [1-10] direction, characterizing plane-strain. Such conditions allow treating the problem considering only three active crystalline systems. The analysis covers small strains, rate-independent and perfectly-plastic behavior. The finite element method is used for discretization of the problem.

Palavras-chave: Crystal plasticity; Fracture; Finite element