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Buckling of the mettalic liner can occur during the depressurization phase of the proof test because it has been plastically stressed during the pressurization phase. Therefore it is in a state of residual compression. Local progressive debonding between the composite overwrap and the metallic liner may then occur, allowing the liner to buckle inward.
FROM:
Venkata M.K. Akula and Michael K. Shubert (Dassault Systems SIMULIA Corporation, Lewisville, Texas), “Analysis of debonding of filament wound composite pressure vessels”, Proceedings of the 28th American Society of Composites (ASC) Conference, Charles Bakis (Editor), DEStech Publications, Inc, November 2013
ABSTRACT: The process of filament winding has gained broad support among a wide range of applications from rocket propellant tanks and automobile natural gas storages tanks to SCUBA and firefighting equipment. The high stiffness-to-weight characteristic of these pressures vessels makes them ideal for such applications. Many failure criteria have to be considered when designing composite pressure vessels. These include, but are not limited to, fiber rupture, liner fatigue, liner buckling, overwrap leakage, and composite crack propagation resulting in burst. In order to simulate a number of these failure mechanisms, the debonding between the liner a composite overwrap must be modeled. In this paper, the use of surface based cohesive behavior in Abaqus to model the debonding between a metallic liner and a carbon fiber composite overwrap will be investigated. The deformation behavior across the bond will be examined along with the effects of bond failure. A procedure will be developed to systematically set up a simulation of the debonding of a liner from a composite overwrapped pressure vessel due to phenomenon such as cylinder buckling and surface defects which effect the liner-to-composite bond.
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