BiQuad
This failure model uses a simplified nonlinear, strain-based, failure criteria with linear damage accumulation. The failure strain is described by two parabolic functions calculated using curve fitting from up to 5 user-defined failure strains.
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Select BiQuad from the Select
Failure list.
- The chart changes to rupture strain vs triaxiality and plots the BiQuad curve. This failure criteria uses five parameters. Here you can select a material set it with default parameters. Shift the curve only by the rupture strain. The characteristic curve always remains the same, only the rupture strain changes.
- Select Advanced and the five fields can be manipulated by value and slider. The characteristic of the failure curve will change.
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Define the failure criteria in the Select Outcome list
and create the material card. If created, strain rates are taken into
account.
Figure 1. Failure BiQuad 