Fatigue criteria in Abaqus

Abaqus provides a range of fatigue criteria that can be used to predict the fatigue life of structures and materials under cyclic loading conditions. Here are some of the commonly used fatigue criteria that are supported by Abaqus:

1. Stress-Life (S-N) Curve: This criterion is based on the relationship between the applied stress and the number of cycles to failure. It is commonly used for metallic materials and can be used to predict the fatigue life of a structure using the stress history.
2. Strain-Life (ε-N) Curve: This criterion is based on the relationship between the applied strain and the number of cycles to failure. It is commonly used for composite materials and can be used to predict the fatigue life of a composite structure using the strain history.
3. Fatigue Damage: This criterion is based on the accumulation of damage due to cyclic loading. It considers the number of cycles and the amplitude of the stress or strain to predict the fatigue life of a structure.
4. Critical Plane Analysis: This criterion takes into account the orientation of the stress or strain relative to the material properties. It predicts the fatigue life based on the maximum damage that occurs on the critical plane.
5. Energy-Based Criteria: This criterion is based on the amount of energy that is dissipated during each cycle of loading. It can be used to predict the fatigue life of a structure based on the energy history.

Abaqus also supports a range of multiaxial fatigue criteria, including the Smith-Watson-Topper (SWT) criterion, the Findley criterion, and the Fatemi-Socie criterion. These criteria take into account the effects of multiaxial loading on the fatigue life of a structure.