Nonlinear Response of Boron/Aluminum Angleplied Laminates Under Cyclic Tensile Loading: Contributing Mechanisms and Their Effects [chapter]

CC Chamis, TL Sullivan
Fatigue of Composite Materials  
The nonlinear response of boron/aluminum angleplied laminates subjected to cyclic loads was investigated. A procedure is outlined and criteria are proposed which can be used to assess the nonlinear response, The procedure consists of testing strategically selected laminate configurations and analyzing the results using composite mechanics. Results from the investigation show the contributions to nonlinear behavior are from: premature random fiber breaks where the ply orientation angle is small
more » ... elative to the load direction, ply relative rotation at intermediate values of the ply orientation angle, and nonlinear aluminum matrix behavior at large values of the orientation angle. Premature fiber breaks result in progressively more compliant material; large ply relative rotations result in progressively stiffer material; and pronounced matrix nonlinear behavior results in no significant change in the stiffness of the initial load portion.
doi:10.1520/stp33167s fatcat:cf54dydrovcllj4wnv5faaspaa