Learning Forum

[RoyalFlowers]

Dear Peter,

Thanks a million for your illumination answers.

-The following picture shows loading and boundary conditions

The plate in which stress distribution was evaluated was attached with some screws to bone. Screws have MPC contact with plate holes, and there is no contact between plate and bone surface.

The applied load results in screw bending and because bonded contact between diagonal screw and plate hole (highlited in below picture) act as a fixed support, there is a stress concentration around plate hole as it is shown. And Max von-Misess stress happended arround this hole. 

-As you said, this stress concentration occured due to boundary condition and I think that I can report this max stress value and I should not go furthur a way to report stress. Is my interpration correct?

-Loading is linear and all materials are assumed as linear elastic.The plate material is Titanium alloy and it is ductile material, hence we want to evaluate von-Misess stress distribution to compare the effect of bone fracture geometry on the load transfer and stress ditributions of the plate. Of course the fracture geometry has an effect on Von-Misess stress distribution of plate. If Max. stress value is closer to yiels strength of plate material, there is a sign of plate failue in that area. Are you agree with me?

-My another question in this regard is that since we do not do any plactic or material strength evaluation, Doess it make sence to report von-Misess stress counturs  or is it better to focous on von-Misess strain instead of that?

-What is your recommendation if we want to report stress of plate only as one value?

I am grateful for your kind attention regarding my questions in-advance. 

Sincerely, Shabnam