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September 26, 2024 at 2:24 pmtobias.doerrSubscriber
Dear All,
I'm using Ansys 2023 R2, Mechanical Application within Workbench.
The purpose is a crack simulation of an arbitrary crack, calculating Fatigue (number of cycles under variying loads).
For this purpose, I use Paris law (Fig.1). This works fine as long as I use only one value for Material constant C and exponent m in the Engineering data.
Â
However, if I want to use Paris law with different material constants and exponents depending on temperature (Fig.2), it doesnt work.
Is there a way to make it work?
    Â
Thanks for your help.
Regards,
Tobi
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September 30, 2024 at 9:51 amLydiaAnsys Employee
Hi Tobias,
You can define a temperature-dependent crack growth law in a SMART Crack Growth analysis but you will need to employ some APDL commands.
"The constants can be defined as a function of temperature (TBTEMP or TBFIELD,TEMP) and/or stress ratio (TBFIELD,SRAT)" :  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v241/en/ans_frac/franundcgrowmech.html%23fraccgrowmechanics
So, insert a Commands Object under your SMART Crack Growth Object; First apply Paris law but then define the two temperature points like tbdata,1,C1,m1and tbdata,1,C2,m2
Then assign the crack growth law to crack CGROW (ansys.com) like:
cgrow,fcop,mtab,cglawid
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October 1, 2024 at 11:30 am
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October 3, 2024 at 11:26 amtobias.doerrSubscriber
EDIT: The question before mentioned aims to adress the following:
- 1. I want to make a creep calculation of the model
- 2. map the residual stresses/strains onto a submodel
- 3. calculate crack fatigue with the pre-conditioned stresses/strains (stress ratio is 0)
Thank you very much for your help!
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