information about solid output vectors femap // advice how to calculate fatigue per element

[mech_eng_p]

Hi All,

I am using femap and i have a question regarding outputvector stresses.

1) Is there a location where i can read about the differences in outputvectors 60010-60031 "normal", "shear", "principle" and with what formula the solid von mises stress is calculated?

2) I am loading a block in two directions and i want to study the fatigue stress. What is the best way to look at stresses to have an idea about the changing stress per element?

I am looking forward to a reply.

 

[Dave442]

Normal, shear and principle components of stress/strain tensors along with the calculation of equivalent stress/strain metrics like Von Mises stress is discussed in mechanics of materials textbooks.

There are different approaches to fatigue analysis. The best way to conduct a fatigue analysis will depend upon your specific materials and loading conditions. The different approaches would be discussed in a fatigue/fracture mechanics textbook.

Here are two websites you might find helpful:

http://www.continuummechanics.org

http://simulatemore.mscsoftware.com/what-is-fatigue-analysis-msc-nastran/

 

[mech_eng_p]

I was actually looking for the actual formula which is used by femap to calculate von mises.

I looked in studybooks and tried already a lot, without any success, that is the reason i asked it hear..

 

[Mustaine3]

http://www.continuummechanics.org/vonmisesstress.html