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- W142476109 abstract "Abstract : Dynamic experiments were conducted to evaluate the effects of oxidation on the mechanical properties of both 5250-4 resin and its composite under high strain rates. A long split Hopkinson pressure bar was used in experiments. For the resin oxidized at 245 deg C for 1500 hrs its mechanical properties, such as Young's modulus and compressive strength, show only slight reduction at high strain rates. For composites oxidized at 195 deg C for 1500 hrs, near the service temperature, the changes of mechanical properties are negligible. For composites oxidized at 245 deg C for 1500 hrs, when loaded along the fiber direction, the mechanical properties decreases by 1/3, when loaded in other two directions the properties show even more drastic reduction, maintaining only about 1/3 of the stiffness and strength compared with pristine composites. Results indicate that when the composites are subject to a temperature slightly higher than the service temperature, the property degradation is extremely significant. In the modeling task, the micromechanical model was extended to predict progressive failure of a laminate in the presence of nonlinear effects, such as, matrix cracking, fiber/matrix debond, delaminations, and viscoelasticity using fundamental principles of continuum damage mechanics." @default.
- W142476109 created "2016-06-24" @default.
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- W142476109 date "2008-09-01" @default.
- W142476109 modified "2023-09-22" @default.
- W142476109 title "Life Prediction of High Temperature Polymer Matrix Composites for Aircraft Engine and Airframe Applications" @default.
- W142476109 hasPublicationYear "2008" @default.
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