Abstract
Abstract The effects of the coefficients of thermal expansion (CTE) of K3B/IM7 and X5260/G40-800 cross-ply laminates on matrix cracking are investigated. The composite CTEs are measured in the temperature range -50°C to 175°C. Based on this measured CTE as a function of temperature, the thermal residual stresses and energy release rates at the crack tip are calculated using the finite element method and compared to those results computed under the assumption of a constant CTE value. The residual stresses in the laminates will have the potential to reduce the mechanical properties of the composites. This paper clarifies the thermal energy release rate change in a temperature range and predicts the critical applied matrix cracking load of the laminates.
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