4.1.1. Failure Initiation

Material Stress

This model is useful for materials that are likely to fail along predefined material planes; for instance, where delamination failure occurs between layers in a composite plate.

Tensile Failure Stress 11

Tensile Failure Stress 22

Tensile Failure Stress 33

Maximum Shear Stress 12

Maximum Shear Stress 23 (3D only)

Maximum Shear Stress 31 (3D only)

Failure is initiated if any of the principal material stresses exceed their respective tensile failure stresses. For shear failures the shear stress on planes parallel to the principal directions are checked against the maximum shear stress.

Material Strain

This model is useful for materials, which are likely to fail along predefined material planes: For instance, where failure occurs parallel to the interface between two layers in a laminated plate.

Tensile Failure Strain 11

Tensile Failure Strain 22

Tensile Failure Strain 33

Maximum Shear Strain 12

Maximum Shear Strain 23 (3D only)

Maximum Shear Strain 31 (3D only)

Failure is initiated if any of the principal material strains exceed their respective tensile failure strains. For shear failures the shear strain on planes parallel to the principal directions are checked against the maximum shear strain.

Material Stress/Strain

This model is useful for materials that are likely to fail along predefined material planes: For instance, where failure occurs, parallel to the interface, between two layers in a laminated plate.