Checking consistency of algorithmic tangents

[dhurtado]

Hi all,

I am coding user material and element subroutines. Is there any way in FEAP to check the consistency of the material and element algorithmic tangents (other than hoping for quadratic convergence)?

Best,

Daniel

[FEAP_Admin]

There are two things you can try:

TANG,NUME,1

will use a numerically computed tangent (finite differenced).  You can compare this to what you get with TANG,,1.

NTANgent does something similar but test on a simple problem to understand what each does.