Learning Forum

[darshankumar.bhat]

Hello everyone,

I am currently using following material model combination in Ansys.
1) Nonlinear Isotropic Hardening- Voce model
2) Kinematic Hardening - Chaboche Model
3) Creep - Modified Strain Hardening
APDL code looks like this,
mpdata,ex, matID,1, ARG1 !Young's modulus [MPa]
mpdata,prxy,matID,1, 0.34 !Poisson ratio
tb,CHABOCHE,matID,1,2
tbdata,1,C_1
tbdata,2,C_2,C_3
tbdata,4,C_4,C_5
tb,NLISO,matID,1,,VOCE
tbdata,1,k_initial,R_initial,R_inf,b

My question now, is this a valid material combination in ANSYS?
The model is experiencing convergence problems for some material parameters.

[Mike Rife]

Hi 

Please see the public documentation here, which includes an example of that material models combination:

https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v242/en/ans_mat/elemmcpos050301.html

Mike

[darshankumar.bhat]

Thank you for your reply.

I am aware of this documentation and it leads to further questions. In the link you sent, I could not see, CHABOCHE+ NLISO + CREEP. However, there is an example of this combination in https://ansyshelp.ansys.com/public//Views/Secured/corp/v242/en/ans_mat/strmamoco050401.html#strchabcreepnliso       

-->(8.2.49) CHABOCHE and CREEP and NLISO Example.

In this example, I see that implicit creep model (strain hardening), NLISO (power law) and Chaboche is combined. 
Can we also combine Creep model (modified strain hardening), NLISO(Voce) and Chaboche ?