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Thermal Cicling and Stress Relaxation

Thermal Cicling and Stress Relaxation

Thermal Cicling and Stress Relaxation

(OP)
Hi all,

I started recently to work with Abaqus using thermal cicling loading and plasticity. To a first model ( a carbon steel pipe ) I used several steps increasing and decreasing the temperature values ( temp. room up to temp. max. and return to room ) and initially I think that were presented good results but looking for better modelling and results I have some doubts, like:

a) I used the step times and increment as default ( 1 ) and how I do not have time-dependent material properties ( like creep )I thought that this would not be important. Is it right ?
b) I would like to introduce "cycle hardening" with goal to get or verify ( if to happen) " mean stress relaxation" and I choosed the sub-options inside of plastic properties, the program asked me "combined" and I put to "cycle hardening" the yeld stress and plastic rate, similar to plastic datas field imput before ( because I do not have specifc material tests ). Could I work this way ? or would have a better way ?

Thanks for the help !

RE: Thermal Cicling and Stress Relaxation

For steel pipe, you could try this value for a test run.

*MATERIAL,NAME=x52_cyc
*ELASTIC
207E9,.3
*PLASTIC,HARDENING=combined, data type=parameters
350e6, 3600e6, 29

RE: Thermal Cicling and Stress Relaxation

(OP)
Thanks Yoman228 ,

Please, Could you explain me what are these parameters e your units ?

Did you already do some similar modelling to verify "stress relaxation " what would have been your evaluation ?


Thanks

RE: Thermal Cicling and Stress Relaxation

Creep generally isn't important for steel until you get to temperatures above 400C and then the effect isn't seen for some months. Much higher temperatueres are a different kettle of fish though and you'd have to think of phase transformations of the material and the rest.

corus

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