Materials Design Principles for the Dynamic Fracture of Larminar Composite Structures

摘要

The goal of this program of basic research is to develop engineering principles for dealing with dynamic, multiple cracking damage in laminated structures, including large scale crack bridging, due to through-thickness reinforcement, and friction. Bridging and friction are treated by materials models at the smallest scales relevant to the mechanisms. By reference to the fundamentals of the dynamic growth of single cracks, which is already largely understood, simple approaches are being formulated to calculate the development of distributed delamination cracks in laminated structures with non-trivial geometry and general loading conditions. To treat large scale bridging effects, structural sub-component models must support dimensions of tilde100 mm or more. The approach bridges scales ranging from this characteristic structural size down to that of micromechanisms (friction, fiber bridging) within the process zone of a single crack. By doing this, a direct link is being established between structural performance and materials design.