I'm performing a creep analysis on a dogbone specimen made of SS-304. I am following this paper Correlation Analysis of Established Creep Failure Models through Computational Modelling for SS-304 Material.
Following is the geometry: https://imgur.com/a/rsy4jW7
In property module I've created the material, specifying Young's modulus (201000 MPa) and Poisson's ratio (0.31) on sheet "Elastic" and specifying Power Law Multiplier (6.18e-17), equation stress order (6.82) and time order (0) in sheet "Creep".
Then I create Visco step in Step module, specifying a time period of 6480000 sec (18000 Hr); in the sheet "Incrementation" I've chosen the max number of increment (10000), Initial increment size (1), minimum (1e-20) and max (360000), then I've chosen creep/swlling...tolerance (0.1).
After that I've created a coupling constraint in Interaction module, then a reference point for the whole grip section with neck section of the specimen.
I've created a symmetry BC for the bottom section of grip and neck.
Then I've defined a load (displacement) of 2mm Magnitude. Also a thermal field is also defined of 720°C.
I've done the mesh, I’ve created and started the job, but I am getting wrong stress results but the creep results are somewhat In line. More over the creep curve trend also matched that of the literature, But not for stress results,
https://imgur.com/pRCY7uj https://imgur.com/PNXd25k https://imgur.com/xrBWjKq https://imgur.com/pCY5NeB
Any suggestion on how to fix the problem.
