Manufacturing Simulation Using Finite Element - Finite Element Analysis for Satellite Structures - page 305

Fig. 7.31 Tie constraint definition between work piece and holder

σ

3

2

1 4

Fig. 7.32 Stress-Strain response of ductile material

One approach assumes fracture is due to nucleation, and growth of voids, while the
equivalent plastic strain at the onset of damage is a function of stress triaxiality and
strain rate. The other approach assumes fracture is due to shear band localization
and the equivalent plastic strain at the onset of damage is a function of shear stress
and strain rate. The approach adopted in this section is the ductile approach.
This approach is more common in the literature, but the reader is free to apply the
second approach and compare results.