ANSYS Creep Model -- Principal Stresses?

bplturner · July 7, 2017, 12:05

Hello,

I am trying to implement a user defined creep model in ANSYS. Is there some way I can get the principal stresses of some element in Usercreep.F? The principal stresses are an input to my model and I'm not sure how to retrieve them. The example only shows hydrostatic and equivalent stress being available.

Any help would be greatly appreciated!

EDIT: This link shows the inputs: http://www.cadfamily.com/download-pd..._USERCREEP.pdf
on page 9 of the slide. I see that 'pres' and 'seqv' are inputs to the usercreep function. Can I just modify the input function to add a principal stress vector?

bplturner · July 11, 2017, 16:16

I believe I somehow need to pass the principal stresses to the UDF. Do I need to save the principal stresses in a user defined variable and reference that from within the Usercreep.F creep strain formula?

Does anyone know how I could go about that? I haven't found many good examples of UDF's.

Thank you.

July 7, 2017, 12:05	ANSYS Creep Model -- Principal Stresses?	#1
bplturner New Member Anonymous Join Date: Apr 2012 Posts: 5 Rep Power: 14	Hello, I am trying to implement a user defined creep model in ANSYS. Is there some way I can get the principal stresses of some element in Usercreep.F? The principal stresses are an input to my model and I'm not sure how to retrieve them. The example only shows hydrostatic and equivalent stress being available. Any help would be greatly appreciated! EDIT: This link shows the inputs: http://www.cadfamily.com/download-pd..._USERCREEP.pdf on page 9 of the slide. I see that 'pres' and 'seqv' are inputs to the usercreep function. Can I just modify the input function to add a principal stress vector?

July 11, 2017, 16:16	Principal Stresses	#2
bplturner New Member Anonymous Join Date: Apr 2012 Posts: 5 Rep Power: 14	I believe I somehow need to pass the principal stresses to the UDF. Do I need to save the principal stresses in a user defined variable and reference that from within the Usercreep.F creep strain formula? Does anyone know how I could go about that? I haven't found many good examples of UDF's. Thank you.

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