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http://www.aero.iitb.ac.in:8081/~awarman/composite_course/Chapter9.pdf

The Hoffman criteria for composites is the same as the Tsai-Wu criteria except a different form for the interaction term (FXY) is used). You can find the equations in the following chapter: www.aero.iitb.ac.in:8081/~awarman/composite_course/Chapter9.pdf

The interlaminar normal stress in a curved quasi-isotropic laminate can be approximated by -1.5*M/Rm*t where M is the moment per unit length, Rm is the mean radius, and t is the laminate thickness. I think you can find this in the Niu composit book.

A number of solid element formulations with rotational DOFs exist and have been proposed over the years. Cmfg, this paper might help: "Hybrid stress tetrahedral elements with Allman's rotational D.O.F.s", K. Y. Sze, Y. S. Pan You can find it in the International Journal for Numerical Methods...

Thanks for the replies. Imagine a circular plate with many bolts attached around the perimeter. Clearly if I apply a tensile load to the center of the plate all the bolts will see the approximately same load (unless of course the stiffness of the structure the plate is attached to is not...

Hi all, I am familiar with the classic methodology presented in Bruhn and Niu to distribute a shear load among a group of fasteners, but I have never found a reference which explains what to do to distribute a tensile (out-of-plane) load. Can someone please point me to a good reference? Thanks Pap