Probabilistic deformation and strength prediction for filament wound composite pressure vessel = 필라멘트 와인딩 복합재 압력 용기의 확률 변형 및 강도 예측

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In this study, probabilistic analysis and experimental tests are conducted to predict the probabilistic deformation and strength of composite pressure vessels subjected to inner pressure loading. For a probabilistic evaluation of deformation and strength, an integrated probabilistic progressive failure analysis code has been developed. The material non-linear laminated shell theory, progressive failure model, Monte-Carlo simulation, and Edgeworth expansion method have been integrated into the probabilistic strength analysis code. Probabilistic progressive failure model is also incorporated with a commercial FEA code (ABAQUS) to predict the reliability of composite pressure vessel including an AFT dome part. The probabilistic analysis code considers the uncertainties in material properties as well as in the composite fabrication process parameter. Three design random variables with uncertainties were selected: (1) composite elastic constants, (2) lamina strength; and (3) the thickness of the helical and hoop layer. In addition, volumetric size effect on the fiber strength is considered in the design random variables. As an analytical method, the Weibull weakest link model and the modified sequential multi-step failure model are considered and mutually compared. The accuracy of probabilistic analysis was verified by comparing the predicted results with the experimental hoop strain or with the burst pressure obtained by a hydro-test with ten composite pressure vessels. The sensitivities of each response to the design random variables were evaluated and conclusions are drawn concerning the relative importance of these variables in the design problem. Improvement of the structural design based on the probabilistic analysis is also discussed.
Advisors
Hong, Chang-Sunresearcher홍창선researcher
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2003
Identifier
181054/325007 / 000995412
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2003.2, [ xiii, 146 p. ]

Keywords

Size effect; Random variable; Burst pressure; Filament winding; Statistical analysis; 통계적 해석; 크기 효과; 확률 변수; 파열 압력; 필라멘트 와인딩

URI
http://hdl.handle.net/10203/26294
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=181054&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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