The paper presents an analytical method that can be used by both polymer chemists and composite designers to develop a microcrack resistant composite cryogenic tank. The method incorporates failure analyses, which are based on an empirical material property called the microcracking fracture toughness. The paper investigates the micromechanics of a mixed-ply laminate, ((+/-theta)/90)s, typical of filament wound tank shells, subjected to both uniaxial and biaxial load. A scheme to measure the material's microcracking fracture toughness with the help of a concise set of experiments is identified. Finite element results are presented that shows the degradation of laminate stiffness as a function of the number of 90 degree plies in a cross-ply laminate, (0/90n)s and the angle theta in a ((+/-theta)/902)s laminate, subjected to uniaxial load. The analysis is extended to predict the influence of the helical angle theta on the stiffness reduction for a similar laminate subjected to biaxial load.
Thermo-micromechanics of microcracking in a cryogenic pressure vessel
2003
10 Seiten, 19 Quellen
Conference paper
English
Thermo-Micromechanics of Microcracking in a Cryogenic Pressure Vessel
British Library Conference Proceedings | 2003
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