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0021998308092210v1
42/16/1619    most recent
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First published on June 26, 2008, doi:10.1177/0021998308092210

Journal of Composite Materials 2008;42:1619.

A more recent version of this article appeared on August 1, 2008

Article

Numerical Modeling of Gas Leakage Through Damaged Composite Laminates

Hisashi Kumazawa1* and John Whitcomb2

1 Structure Technology Center, Japan Aerospace Exploration Agency 6-13-1 Ohsawa, Mitaka-shi, Tokyo 181-0015, Japan
2 Department of Aerospace Engineering, Texas A&M University 3141 TAMU, College Station, TX 77843-3141, USA

* To whom correspondence should be addressed.


  Abstract

A computational fluid dynamics (CFD) model was developed to predict leakage through a damaged laminate. Crack opening displacements (COD) from a 3D finite element model were fit using a polynomial function. This curve fit was then used in defining the openings in the CFD model. Delamination length at crack intersections was estimated based on experimental data for specimens subjected to thermal loads only. Leakage under combined thermal and biaxial mechanical loadings was predicted with the estimated delamination length. Considering the sensitivity of the predictions to many variables, the calculated leakage under combined thermal and biaxial mechanical loadings was estimated with reasonable accuracy.

Key Words: laminates, leakage, finite element analysis, cracks, delamination, cryogenic tank.


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