Hi,
I am interested in performing crack initiation and propagation analysis considering high-temperature creep for metals using Abaqus. I know that Abaqus has creep analysis capability with Abaqus/standard and damage modeling capability for ductile metals. However, after defining creep in the material card, I am not able to use ductile damage initiation and evolution anymore.
The error I got was:
"The option *damage initiation, criterion=shear cannot be used in conjunction with *creep"
My question on this matter is three-fold:
1) Is there any Abaqus built-in way to model creep + damage?
2) why is creep analysis not implemented in Abaqus/explicit? Is it because of computational accuracy or efficiency?
3) if there is no built-in models, what is the best way to move forward. Should I consider writing a UMAT/VUMAT subroutine considering both creep and failure, or write a CREEP subroutine and link it to a UMAT/VUMAT failure subroutine?
Thanks,
Shiyao
Hi Shiyao,
I believe you need to use CREEP subroutine in which you can define the creep constitutive equations (depending on which creep model you want to use). You can also include creep damage equations in the subroutine.
I believe ABAQUS only accept one subroutine file, so creep and damage have to be in the same subroutine file.
Regards,
Wu
Hi Wu,
Thank you for your recommendation. I will study the CREEP subroutine. Do you have any recommended papers from you or from other scholars on this matter (CREEP+DAMAGE)?
I believe it is possible for Abaqus to utilize multiple user subroutines. Previously, I was able to write VUMAT + VUCHARLENGTH, both of which are user subroutines to define material constitutive behaviors and directional elemental characteristic lengths. I also know that some VUEL code is used in conjunction with VUMAT codes for the purpose of post-processing for VUEL.
Regards,
Shiyao
Hi Shiyao, you are right ABAQUS can take multiple subroutines, but to my knowledge they have to be in the same FORTRAN file?
I did some relevant study in this paper:
Determination of Creep Damage Properties from Small Punch Creep Tests Considering Pre-Straining Effect Using an Inverse Approach
Regards,
Wu
- Badges
- Science topic
- Similar topics
- Biological Science
- Immunology
- Antibodies