Convergence issue

[TerryZ5075]

Hello all,

My model is a simple lap joint. Only one bolt is used in this model at this moment. One end of the joint is fixed, and the other end has a displacement B.C. of 0.01 inch.

For step 1, I have the maximum number of increments of 1000, initial increment size of 1E-5, and minimum of increment size of 1E-20.

For interaction, I have a general contact where I selected 5 contact pairs, instead of using "all with self". I also tried "surface to surface contact with small sliding". It doesn't converge either.

some screenshots are attached. Appreciate any advise. Thanks.

 

[FEA way]

Try enabling automatic stabilization in step settings. If it doesn’t help, you can switch to dynamic implicit quasi-static step type but it might be also necessary to fix contact issues first - ensure initial establishment of contact.

 

[DanStro]

You also might want to look at making the mesh of one of the parts in the contacting area finer than the other. If they are the same material I don't think it'll matter which you pick but if they are different materials then put a finer mesh on the less stiff material.

 

[TerryZ5075]

Thanks FEA way. I switch to dynamic implicit and it works. Appreciate your reply.