Material1D

In additional to the default output types supported by all materials, all uniaxial material models support the following basic output types.

variable label	physical meaning
SP	principle stress
EP	principle strain
EEP	principle elastic stress
PEP	principle plastic strain

All principle values are identical to the normal ones for uniaxial material models.

Depending on the specific material model, additional output types may be available.

The history vector is a vector of variadic length that stores the necessary history variables for the material model. Different material models may have different history variable storage layout.