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Stress linearization

Stress linearization

Stress linearization

(OP)
Can the stress linearization method (ASME Section VIII Div 2) be used for analyzing components which do not form pressure boundary parts? For example if a FEA is done on a shaft with a torque acting on it ,and there are some local stress concentrations in the shaft, then can I use the method described under the elastic analysis to see if the component will fail or not?

RE: Stress linearization

I doubt that it would help you.

The procedures in the ASME Code are designed for Protection Against Plastic Collapse and Protection Against Failure from Cyclic Loading - Ratchetting. And Protection Against Plastic Collapse is based on thin-shell theory for Pressur vessels.

RE: Stress linearization

(OP)
Thank you for the reply TGS4. Does this mean that both the elastic analysis method and elastic-plastic analysis cannot be used if the component are not pressure boundary components?

RE: Stress linearization

In order to use any method to evaluate stresses (or strains), you need to have an understanding of the failure modes and any assumptions built into the evaluation procedure that you are using .

With respect to the elastic-plastic method, the load factors used in the current edition of the ASME Code are specific to Division 2 pressure vessels with the concurrent fabrication techniques and tolerances. For a non-VIII-2 application, you need to determine the appropriate load factors.

My recommendation: figure out the appropriate failure modes for your structure. Then determine appropriate design factors / load factors. Then, use an appropriate evaluation technique where you understand the assumptions. Then, go ahead and use it.

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