ELEMENT STIFFNESS MATRIX
ELEMENT STIFFNESS MATRIX
(OP)
Hi,
I am using USDFLD and a solution dependent field variable to specify the variation of elastic modulus (fieldv=pressure=s11+s22+s33 in my case). Then how is the element stiffness matrix computed at beginning of each load increment? The material properties are a function of the field variable which in itself are solution dependent. I have read some text on this but it is not very clear to me. Can anyone help?
Thanks in advance
I am using USDFLD and a solution dependent field variable to specify the variation of elastic modulus (fieldv=pressure=s11+s22+s33 in my case). Then how is the element stiffness matrix computed at beginning of each load increment? The material properties are a function of the field variable which in itself are solution dependent. I have read some text on this but it is not very clear to me. Can anyone help?
Thanks in advance





RE: ELEMENT STIFFNESS MATRIX
RE: ELEMENT STIFFNESS MATRIX
Thanks for your reply. My confusion was because after using the subroutine, the stresses are computed correctly at the integration points but the strains are not. I thought that in FEM the order of solution is (i) nodal disp> strains> stresses. So, I was wondering how the stresses are correct but the strains are not.