Flexural Behavior of Cross-Ply Thermally Aged Bismaleimide Composites
Thermal aging in oxidative environments is a critical degradation mechanism for polymer composites in aerospace applications. After degradation, the composite strength is reduced and the working life is shortened. In the present work, thermal-oxidation effects on the bending behavior were studied experimentally and numerically. A cross-ply laminate was manufactured using, IM7G/AR4550, a unidirectional bismaleimide prepreg system. Thermal aging experiments were conducted in air at 176.7 °C (350 °F) for 1,700 hours. Weight loss of the samples was monitored during aging and three-point bending test was performed to characterize thermal oxidation impact on the bending behavior. 3D transient coupled diffusion-reaction simulations were conducted based on representative volume elements (RVE) using COMSOL Multiphysics. Three-point bending test was simulated using ABAQUS taking the effect of the transient oxidation growth and degradation into consideration. Thermal aging for 1,700 hours resulted in a weight loss of 0.5 % and a reduction of 19 % in the flexural modulus of the samples. Weight loss and flexural modulus simulation results showed a good match with the experimental findings.
R. M. Hussein et al., "Flexural Behavior of Cross-Ply Thermally Aged Bismaleimide Composites," Proceedings of the Composites and Advanced Materials Expo 2016 (2016, Anaheim, CA), The Composites and Advanced Materials Expo (CAMX), Sep 2016.
Composites and Advanced Materials Expo 2016, CAMX 2016 (2016: Sep. 26-29, Anaheim, CA)
Mechanical and Aerospace Engineering
Intelligent Systems Center
Keywords and Phrases
Aerospace applications; Degradation; Laminated composites; Oxidation; Thermal aging; Thermooxidation; Bismaleimide composites; Composite strength; Comsol multiphysics; Degradation mechanism; Oxidative environment; Representative volume element (RVE); Three-point bending test; Transient oxidations; Steam turbines
Article - Conference proceedings
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01 Sep 2016