Mullins effect: material and theory documentation

Checked documentation

Official Abaqus 2025 documentation checked for the softening factor, its beta=0 original-form limit, units and material limitations. This does not establish a fit to a NetPhysics specimen.

Material model and calibration · Theory and stress computation

The primary 1999 attribution remains Ogden–Roxburgh. Its original full text was not newly retrieved for this update.

Reproducible use

Implementation scope and equations · Original reference code · Predictive experiment design