# struct.shell.prop.anis

Syntax

l := struct.shell.prop.anis(p,itype)
struct.shell.prop.anis(p,itype) := l

Get/set the anisotropic material properties as a list of 6 values.

Membrane stiffness is indicated by itype = 1, and bending stiffness is indicated by itype = 2.

If the element does not have anisotropic properties an error will occur.

Modifying the stiffness of an element can result in instability if done during cycling. Dependent values should be forced to update using struct.force.update. See the documentation of struct.force.update for comments on the cost.

Returns: l - the shell anisoptric material stiffness coefficients for itype l - the shell anisoptric material stiffness coefficients for itype p - a pointer to a shell element itype - indicates membrane (1) or bending (2) stiffness