Introduction to UMAT Subroutine in Abaqus

In many engineering projects, the built-in material models in Abaqus are not enough for capturing complex material behavior. This is where user-defined material subroutines come into play. Abaqus allows advanced users to write their own material model through a User MATerial subroutine, commonly known as UMAT. In simple terms, a UMAT is a piece of […]

Large Deformation in ABAQUS via UMAT

1. An Introduction to Non-Linear Continuum Mechanics Finite deformation (also called large deformation or finite strain theory) is a framework in continuum mechanics that describes the behavior of materials undergoing significant volume changes, where strains and rotations are not small. Contrary to small deformation theories, which assume infinitesimal changes, finite deformation accounts for geometric non-linearities […]