The textbook from Micheal Niu has a relatively easy methods utilizing FEM to derive the load distribution of fasteners, but, only contains a limited numbers of fasteners and configurations.
From your saying of plastic injection mold making related applications. I think you should be looking at program such as MoldFlow instead of conventional FE code such as ANSYS, and ANSYS contact modeling is not as powerful as those offered by Abaqus and MARC, which is a proven products comes to...
