Reliability Analysis of Filament-wound Composite Pressure Vessels
|關鍵字:||可靠度;破壞準則;首層破壞分析;直接數值積分;串聯系統假設;韋氏分佈;纏繞式複合材料;壓力容器;reliability;failure criteria;first-ply failure;direct numerical integration;series system hypothesis;weibull distribution;filament-wound composite;pressure vessel|
A method formulated on the basis of the concept of first-ply failure and the structural reliability theory is presented for the reliability analysis of filament-wound composite pressure vessels with random strength parameters. The first-ply failure analysis of the filament wound composite pressure vessels is achieved via the use of different phenomenological failure criteria and the finite element method. The maximum stress and Tsai-Hill criteria are used to establish the limit state equation. The direct numerical integration method together with the series system hypothesis are adopted to compute the reliability of the pressure vessels. Experimental investigations of lamina strength distributions and first-ply failure of filament-wound composite pressure vessels were performed. It has been found that the lamina strengths and the first-ply failure load of the vessels can be well fitted by Weibull distributions. Baseline probability distributions of lamina strength parameters constructed from the tests are used in the reliability analyses of the filament-wound composite pressure vessels. The accuracy of the proposed methods in reliability analyses of the filament wound composite pressure vessels are verified by the experimental results.
|Appears in Collections:||Thesis|