Fracture Test Methods for Plastically Responding COPV Liners | Zendy

D. S. Dawicke | Zendy; J. C. Lewis | Zendy

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Fracture Test Methods for Plastically Responding COPV Liners

Author(s) -

D. S. Dawicke,

J. C. Lewis

Publication year - 2009

Publication title -

54th aiaa/asme/asce/ahs/asc structures, structural dynamics, and materials conference

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2009-2516

Subject(s) - materials science , fracture (geology) , composite material , structural engineering , test (biology) , forensic engineering , geology , engineering , paleontology

An experimental procedure for evaluating the validity of using uniaxial tests to provide a conservative bound on the fatigue crack growth rate behavior small cracks in bi-axially loaded Composite Overwrapped Pressure Vessel (COPV) liners is described. The experimental procedure included the use of a laser notch to quickly generate small surface fatigue cracks with the desired size and aspect ratios. An out-of-plane constraint system was designed to allow fully reversed, fully plastic testing of thin sheet uniaxial coupons. Finally, a method was developed to determine to initiate small cracks in the liner of COPVs.

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