Preforms constructed froma plain-weave, glass fabric were compressed in-plane within a fixture that mimicked the constraints of a closed mold. Typically, a gap was left betweenthe bottom of the preform and the floor of the fixture; upon initial compression, the preform slid within the fixture, which allowed the friction between the preform and the fixture wall to be measured. The preform began to compress as it contacted the floor of the fixture. The deformation was proportional to the applied stress until a critical stress was reached. Above this stress, the preform sustained damage in the form of localized buckling and a corresponding decrease inmechanical integrity. The in-plane compressive behavior varied with system parameters, such as preform geometry, fabric orientation, and clamping stress and was shown to be strongly dependent onfrictionof the preform against the fixture wall. A model was developed to describe the contribution of preform frictionwith the fixture wall to the in-plane compressive behavior of constrained preforms.
展开▼
