Characterizing Thermal/Mechanical Properties of Filament Wound Composites

摘要

The characterization of composites is a continuing process involving a wide variety of materials with different compositions, laminate geometries and fabrication processes. This thesis examines bench test methods for the determination of the linear coefficients of thermal expansion, residual stresses due to fabrication, and delamination strengths in S2-Glass/Epoxy and AS4 Graphite/Epoxy filament wound cylinders. Results from these tests are compared to finite element and closed form solutions. Test theory correlation is generally good. The slopes of temperature-strain curves are closely approximated by the linear coefficient of thermal expansion calculated for the laminates. Predicted values of residual stress are approximately equal to those determined by a simple bench test. Measured delamanation strengths were found to be considerably lower (35%) than other published data.