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Hello,

Can anyone explain to me what is the problem with reduced quadratic elements (C3D20R) while used in a node to surface contact discretization?

I am using a traction-seperation formulation cohesive surface and for that I can only define node to surface contact. In this case element types of C3D8I and C3D20 work but C3D20R does not work! (I am using Abaqus)

Thanks a lot,

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Is there a relationship between the elastic constant of the metal and the the number of the fatigue cycles?If we can find the relationship of the stand test spesimen,can we use that  relationship to predict the fatigue life of other structures? 

Hi,