Journal Published Online: 01 April 1996
Volume 18, Issue 2

Simplified Data Reduction Methods for the ECT Test for Mode III Interlaminar Fracture Toughness



Simplified expressions for the parameter controlling the load-point compliance and strain energy release rate were obtained for the edge crack torsion (ECT) specimen for Mode III interlaminar fracture toughness. Data reduction methods for Mode III toughness based on the present analysis are proposed. The effect of the transverse shear modulus G23 on Mode III interlaminar fracture toughness characterization was evaluated. Parameters influenced by the transverse shear modulus were identified. Analytical results indicate that a higher value of G23 results in a lower load point compliance and lower Mode III toughness estimation. The effect of G23 on the Mode III toughness using the ECT specimen is negligible when an appropriate initial delamination length is chosen. A conservative estimation of the Mode III toughness can be obtained by assuming G23 = G12 for any initial delamination length.

Author Information

Li, J
NASA Langley Research Center, Hampton, VA
O’Brien, TK
NASA Langley Research Center, Hampton, VA
Pages: 6
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Stock #: CTR10520J
ISSN: 0884-6804
DOI: 10.1520/CTR10520J