1st European Mechanics of Materials Conference on Local Approach to Fracture '86 - 96'
J. Phys. IV France 06 (1996) C6-123-C6-131
Numerical and Experimental Study of Early Stages of the Failure of AlSi-Cast AlloysN. Lippmann1, 2, S. Schmauder2 and P. Gumbsch1
1 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestrasse 71, 70174 Stuttgart, Germany
2 Staatliche Materialprüfungsanstalt (MPA), University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany
The failure mechanisms in different AlSi-cast alloys with varying microstructures of the Si-eutectic are studied by in-situ tensile tests in a scanning electron microscope. Failure criteria for the matrix and the Si-particles as well as the macroscopic fracture behaviour are determined on the basis of these observations. The critical failure stress of Si-particles is calculated by Finite Elemente modelling of the fracture behaviour of a large grained model alloy. Crack initiation and subsequent crack propagation in the real microstructure of the technical alloys is then simulated using the recently introduced method of multiphase elements and an automatic element elimination technique. Experiment and simulation are in very satisfactory agreement.
© EDP Sciences 1996