Below is the list of Hyper and Visco-elastic Material keywords.

/MAT/LAW33 (FOAM_PLAS)

/MAT/LAW34 (BOLTZMAN)

/MAT/LAW35 (FOAM_VISC)

/MAT/LAW38 (VISC_TAB)

/MAT/LAW40 (KELVIMAX)

/MAT/LAW42 (OGDEN)

/MAT/LAW62 (VISC_HYP)

/MAT/LAW69

/MAT/LAW70 (FOAM_TAB)

/MAT/LAW77

/MAT/LAW82