6.5.4 Plastic Indicators
For plasticity models, the those zones/elements satisfying the yield criterion can be displayed. Such an indication usually denotes that plastic flow is occurring, but it is possible for an element to simply ‘sit’ on the yield surface without any significant flow taking place. In such cases it is important to examine the whole pattern of plasticity indicators to see if a failure mechanism has developed. Two types of failure mechanisms are indicated by the plasticity state: shear failure and tensile failure (figure 19).
Figure 19: Simulation Result of slope in terms of plastic and yield zones or elements