There has historically been confusion about the "P-elements" in Pro/MECHANICA. Here is a list of resources that I hope will help in understanding this feature.
Please consider the commentary provided in this forum and specifically, the following threads from the Finite Element Analysis engineering Forum (Forum727):[li]p- elements (Thread727-23503) [/li][li]Pros/Cons of Pro/MECHANICA (Thread727-24111)[/li]
Articles by Scott A. Prost-Domasky, P.E., D.Sc:[li]p-version vs. h-version - Part I (www.engineersclub.net/techpubs/ENGCLUB7.doc) [/li][li]p-version vs. h-version - Part II (www.engineersclub.net/techpubs/ENGCLUB8.doc) [/li]