Crippling of Titanium Matrix Composite Stiffeners

Abstract

Using established principles of laminate buckling theory and postbuckling load redistribution, a theory is derived for crippling analysis of specially orthotropic or very nearly specially orthotropic laminated composite stiffeners. Results from testing of SCS-6/Ti-15-3 titanium matrix composite (TMC) stiffener segments are also presented and show good correlation with theoretical predictions. The testing program includes three different layups, three different geometries, and a repetition of two tests for each possible geometry/layup combination for a total of 18 tests. The results of the theory are presented in the form of easy-to-use design curves.

A new parameter to describe crippling strength: Experimental and theoretical investigations for post‐buckling behaviors of the composite structures

“…Although slenderness (i.e., or length) is not an effective parameter to find crippling strength in composites, it is very difficult to create only one curve for composites like metals. Fogarty 21 explains difficulties of the empirical curve employments in laminated materials with two reasons. Firstly, it is emphasized that the elastic modulus is the same through all directions for isotropic bodies.…”