Thank you for useful video! I have a problem. In my case, the vessel is subjected to internal pressure and before cyclic pressure, there are autofrettage process (large value of internal pressure to make the vessel yield fully). Based on finite element method, I know about the stress and strain amplitude during cyclic pressure but the predicted fatigue life is too large compared with the experiment (nearly 5 times) Could you help me explain the reason, please!
I would suggest you review the work done on autofrettage at the Technical University of Darmstadt by Tim Seeger, Michael Vormwald and Volker Koettgen. There can be many reasons why experiments and calculations do not align and any reasons I could give right now would only be guesses. But I have seen calculations that use the multiaxial strain life approach be successful for autofrettage. Happy studies!
Thank you for useful video!
I have a problem. In my case, the vessel is subjected to internal pressure and before cyclic pressure, there are autofrettage process (large value of internal pressure to make the vessel yield fully).
Based on finite element method, I know about the stress and strain amplitude during cyclic pressure but the predicted fatigue life is too large compared with the experiment (nearly 5 times)
Could you help me explain the reason, please!
I would suggest you review the work done on autofrettage at the Technical University of Darmstadt by Tim Seeger, Michael Vormwald and Volker Koettgen. There can be many reasons why experiments and calculations do not align and any reasons I could give right now would only be guesses. But I have seen calculations that use the multiaxial strain life approach be successful for autofrettage. Happy studies!
@@mbarkey.mechanics Thank you so much!
Could you give me some papers or research of given authors, please!
Best,
you will find them with a search. Happy studies.