Learning Forum

[Ganapti_Sastry]

Can anyone help me with an example illustrating how to use READ file command in INISTATE while giving residual stresses- different at different depth of a gear which is case carburised, as initial stresses in the model for static analysis? Is there any other command I should use?

[Ashish Khemka]

Please see if the following link helps you:
4.6. Example Problems Using Initial State (ansys.com)

To access Ansys Online Help: How to access the ANSYS Online Help ÔÇö Ansys Learning Forum

Regards Ashish Khemka

[Ganapti_Sastry]

Thank you for the reply..... please correct me if my understanding is wrong.....
From what I understand," INISTATE, DEFINE" or "INISTATE, READ", both have a format that involves element ID, integration points, and section integration points...which we cannot feed manually. The commands can be used only with the data coming from another analysis output that has the same mesh as our current model. Had it been uniform pre-stress throughout the model i.e: at all the points, it would have been simpler as we can use "all" in the format of "INISTATE, DEFINE or READ"
Is my understanding correct?
If ye, then how can I proceed with giving my pre-stress condition wherein I intend to feed different stress values at different points of the model?
Please clarify.
Thanks in advance.

[Ashish Khemka]

I believe you are using Mechanical APDL and not Workbench. Is that correct? The reason for asking this is because Workbench offers a better user interface and an easier way to import stress data. Please let me know and I will reply further.
Regards Ashish Khemka

[Ganapti_Sastry]

Yes.....I am using workbench.....

[Ashish Khemka]

Please see if the following video helps you:

How to Map Stresses using ANSYS Workbench Mechanical 18.0 - YouTube

Regards Ashish Khemka

[Ganapti_Sastry]

Thank you very much for your timely and precise response.....This pretty much solves my problem...

[Ganapti_Sastry]

But.....Can I apply varying stress values across the diameter of my gear? My pre-stress values are not the same throughout the gear but they vary with depth. Can I give such a condition while giving stresses(x,y,z)?

[Ganapti_Sastry]

I mean not x, y, z but tangential and radial stresses

[Ganapti_Sastry]

Let me rephrase my question.
In order for me to extract stress values for mapping into the model, I need to simulate the conditions that caused the net residual stresses in the model.which is not possible(if I am not wrong)..then how can I extract the residual stress values which eventually will be mapped?

[Ashish Khemka]

You can change the coordinate system to a cylindrical one and choose which stress value indicates radial, tangential and axial stress.

Regards Ashish Khemka