TY - JOUR
T1 - Effect of stretching-shearing coupling on instability-related delamination growth
AU - Davidson, Barry D.
AU - Ferrie, Catherine H.
N1 - Funding Information:
One of the authors (C.H.E) was supported by the National Science Foundation Research Experience for UndergraduatPerso gram, NSF Award Nos EID-9101145 and EID-9200508. The authors wouldl ike to thank MrB rianDix for his 'pioneering work' making this research possible, Mr John Kotlarz and Mr Kevin CaUahan for their assistance in the development of the test fixturing, and the Ciba-Geigy Corporation, in particular Dr S. M. Lee, for their generous donation of materials used in this research.
PY - 1994
Y1 - 1994
N2 - Results are presented from a combined theoretical and experimental investigation into the effect of stretching-shearing coupling on the buckling and growth of near-surface delaminated regions. Honeycomb sandwich laminates with graphite/epoxy face sheets containing preimplanted, through-width delaminations were tested in compression. Two layups were tested. Each layup contained delaminated regions with identical in-plane and flexural moduli; however, one layup exhibited stretching-shearing coupling, whereas the other did not. Delamination buckling was predicted using a cylindrical buckling analysis, and energy release rates and fracture mode ratios were obtained by a crack tip element analysis. Delamination growth was predicted using a linear, mixed-mode delamination growth law. Significantly different delamination buckling and growth strains were predicted for the two layups. Predicted delamination buckling and growth strains correlated well with experimental results.
AB - Results are presented from a combined theoretical and experimental investigation into the effect of stretching-shearing coupling on the buckling and growth of near-surface delaminated regions. Honeycomb sandwich laminates with graphite/epoxy face sheets containing preimplanted, through-width delaminations were tested in compression. Two layups were tested. Each layup contained delaminated regions with identical in-plane and flexural moduli; however, one layup exhibited stretching-shearing coupling, whereas the other did not. Delamination buckling was predicted using a cylindrical buckling analysis, and energy release rates and fracture mode ratios were obtained by a crack tip element analysis. Delamination growth was predicted using a linear, mixed-mode delamination growth law. Significantly different delamination buckling and growth strains were predicted for the two layups. Predicted delamination buckling and growth strains correlated well with experimental results.
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U2 - 10.1016/0263-8223(94)90106-6
DO - 10.1016/0263-8223(94)90106-6
M3 - Article
AN - SCOPUS:0028728504
VL - 29
SP - 383
EP - 392
JO - Composite Structures
JF - Composite Structures
SN - 0263-8223
IS - 4
ER -