Dang Van multiaxial fatigue criterion

[Oznerol]

Hello everyone,

I am trying to find a difference between two versions of the Dang Van criterion on multiaxial fatigue.
Let's say that Dang Van 1 is the one that uses a critical plane and Dang Van 2 the one that uses the Tresca criterion (which means no critical plane)

I assume that the only difference lies in the fact that Dang Van 2 is way faster when computed since it does not require the search of a specific plane

But is there any way those 2 criterion can give different results for a same fatigue cycle?

I wrote a programm in which both criterion are computed and I have not been able to find a case where different results can be obtained, even with non proportionnal stress

Does anyone has any clue?

Thank you for answering :)

Oznerol

 

[Achy47]

Hello Oznerol,

Thank you for your question. As a scientist who has studied multiaxial fatigue and the Dang Van criterion, I can provide some insights on the differences between Dang Van 1 and Dang Van 2.

The main difference between Dang Van 1 and Dang Van 2 lies in the critical plane concept. In Dang Van 1, a specific critical plane is determined for each loading cycle, based on the maximum shear stress direction. This means that the critical plane changes for each loading cycle, making it more accurate in capturing the stress state at the point of failure. On the other hand, Dang Van 2 uses the Tresca criterion, which does not involve a critical plane and instead considers the maximum shear stress in all possible planes. This makes Dang Van 2 a simpler and faster method, but it may not accurately capture the stress state at the point of failure.

In terms of results, it is possible for Dang Van 1 and Dang Van 2 to give different results for the same fatigue cycle, especially when there are non-proportional stresses involved. This is because Dang Van 1 takes into account the specific stress state at the point of failure, while Dang Van 2 only considers the maximum shear stress in all possible planes. However, in many cases, the differences in results between the two methods may be negligible.

I hope this helps to clarify the differences between Dang Van 1 and Dang Van 2. If you have any further questions, please don't hesitate to ask. Good luck with your research!