tensor.j2

Syntax

f := tensor.j2(t)

Get the second deviatoric stress invariant. The tensor must be of size three. This is defined as J2=16[(σxσy)2+(σyσz)2+(σzσx)2]+τ2xy+τ2yz+τ2zx .

Returns:f - second deviatoric stress invariant
Arguments:t - tensor