7.4. Modeling of stiffness degradation of laminated composite materials across length scales
We earlier formulated kinetic damage-accumulation models that can account for scale characteristics of fiber composite materials at differing microstructural scales; that is, corresponding to the microstructural level of constituents (fiber and matrix), as well as the size characteristics of a ply or group of plies. Next, we include these models when modeling the damage-accumulation process at the structural level for the whole composite laminate.
The algorithm for damage assessment for composite laminates uses the following assumptions:
1. The composite laminate is in the plane stress condition.
2. A change in quasistatic or cyclic loading conditions will ...