Stress and Damage in Polymer Matrix Composite Materials Due to Material Degradation at High Temperatures
This report describes analytical methods for calculating stresses and damage caused by degradation of the matrix constituent in polymer matrix composite materials. Laminate geometry, material properties, and matrix degradation states are specified as functions of position and time. Matrix shrinkage and property changes are modeled as functions of the degradation states. The model is incorporated into an existing composite mechanics computer code. Stresses, strains, and deformations at the laminate, ply, and micro levels are calculated, and from these calculations it is determined if there is failure of any kind. The rationale for the model (based on published experimental work) is presented, its integration into the laminate analysis code is outlined, and example results are given, with comparisons to existing material and structural data. The mechanisms behind the changes in properties and in surface cracking during long-term aging of polyimide matrix composites are clarified. High-temperature-material test methods are also evaluated.
- Research Organization:
- NASA Lewis Research Center, Cleveland, OH (United States)
- OSTI ID:
- 236797
- Report Number(s):
- N-96-21668; NASA-TM-4682; NAS-1.15:4682; E-9506; NIPS-96-34542; TRN: 9621668
- Resource Relation:
- Other Information: PBD: Jan 1996
- Country of Publication:
- United States
- Language:
- English
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