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TECHNICAL PAPERS

On Delamination Growth in Shallow Shells

[+] Author and Article Information
B. Storåkers, P.-L. Larsson, C. Rohart

Department of Solid Mechanics, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden

J. Appl. Mech 71(2), 247-254 (May 05, 2004) (8 pages) doi:10.1115/1.1668122 History: Received December 16, 2002; Revised September 19, 2003; Online May 05, 2004
Copyright © 2004 by ASME
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References

Figures

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Geometry of the problem. (a) General view. (b) Section view at the plane x=0.
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Measured fracture toughness as function of mode mixity for a unidirectional layup of carbon/epoxy 6376C/HTA7. Experimental results by Ljung 36.
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(a) Finite element mesh for a circular delamination with local crack advance indicated. (b) Complete finite element mesh.
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Local maximum (s=1) of the energy release rate Ḡ as function of the external load ε̄0
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Variation of the energy release rate Ḡ along the delamination front s at ε̄0=1, 2
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Stress intensity factors, K̄I,K̄II, along the delamination front s at ε̄0=2
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Mode mixity variation along the delamination front s at ε̄0=1, 2, Z=1
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Variation of the energy release rate Ḡ along the delamination front s at ε̄0=2,Z=1. (–), prior to crack advance. ([[dashed_line]]), after crack advance. The perturbed crack contour is also sketched.
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Local maximum (s=1) of the energy release rate Ḡ as function of the external load ε̃0
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Variation of the energy release rate Ḡ along the delamination front s at ε̄0=1.0, 1.1 and Z=0.1, 0.5
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Limits for contact as function of the external load ε̃0 and the geometry parameter Z, (–) by the condition KI=0, ([[dashed_line]]) by the condition w(a,0)=0
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Stress intensity factors K̄I,K̄II as function of the external load ε̃0. (a) Z=0.1. (b) Z=0.5.
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Hatched region of contact at ε̃0≈2,Z=1

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