Reply To: creep analysis_ benchmark the data

[John Doyle]

The standard creep options listed in Table 4.2 of the MAPDL Material Reference Guide are limited to primary and secondary creep and do not capture the higher rate of creep strain development that occurs at the onset of tertiary creep.  

Having said that, if you are certain that you are observing tertiary creep in your application, there are other options that might be helpful.  

You can try to combine creep with metal plasticity and possibly a generalized damage model.  See Section 7.1, of MAPDL Material Reference Guide, for a list of valid material combinations.  There is also an APDL example input documented in Section 7.2 of the combination of plasticity, creep and damage.  There are no curve fitting tools available in MAPDL for the damage model options. 

If material combinations is not helpful, it is also possible to write your own user creep routine and link it into the standard MAPDL code.  Please refer to the MAPDL Programmer Reference Guide for more details.