9th ASCE Specialty Conference on Probabilistic Mechanics and Structural Reliability Srinivasan, S., and Bhattacharya, B. 1 PROBABILISTIC FAILURE PREDICTION OF FILAMENT-WOUND GLASS-FIBER REINFORCED COMPOSITE TUBES UNDER BIAXIAL LOADING

Filament-wound, fiber-reinforced polymer-matrix composite laminate tubes have been used for a wide range of engineering applications, owing to their high specific stiffness, strength and superior corrosion resistance. Leakage failure of composite tubes under multiaxial loading has been an important design concern. Extensive analytical and experimental investigations have recently been reported on leakage failure of composite tubes. These investigations developed deterministic estimates of leakage failure for different combinations of axial load and internal pressure. Effects of uncertainties in material properties and laminate construction on leakage failure need to be studied in detail. In this study; probabilistic analyses are performed to predict first-ply failure of angle-ply composite laminate tubes under combined internal pressure and axial loading. Randomness is considered in (1) elastic moduli along principal lamina directions; (2) uniaxial matrix-dominated strengths of each lamina; and (3) local thickness variation of individual plies. The probabilistic finite element analysis is performed using the ANSYSTM program and Latin hypercube sampling. Influence of each basic variable on first-ply failure is evaluated. These are compared with experimental results available in the literature