Hashin criteria predict failure modes in composites based on stresses in fiber and matrix. While effective, implementing them in numerical simulations poses challenges. Abaqus addresses this but is limited to 2D plane stress. A VUMAT subroutine extends Abaqus to simulate 3D damage progression using the energy method for static and dynamic problems.

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In this project, the Hashin damage model is implemented in Abaqus to conduct the failure analysis of fiber metal laminates (FMLs) containing a blunt notch.

Progressive damage FEA of a Type III COPV in Abaqus, custom Hashin failure UMAT (Intel Fortran) for T700/CFRP overwrap, Al 6061-T6 liner, Ti-6Al-4V boss, cohesive zone interface, 18,539 hex elements, four pressure regimes from 52.5 MPa proof load to 2500 MPa material limit investigation.