SEDL / STP / STP601-EB / STP28641S

Mixed Mode Fracture in Anisotropic Media

Williams, JG
Professor of polymer engineering and research assistant, Imperial College, London,

Birch, MW
Professor of polymer engineering and research assistant, Imperial College, London,

Pages: 13    Published: Jan 1976

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Abstract

Tests were performed on straight-grained timber to give Mode I fractures in three geometries, and satisfactory K¹ data were produced. Mode II tests were more difficult to perform, and the data correlated on a constant net section shear stress basis indicated some form of shear yielding failure. The mixed mode tests used tension specimens with the grain at various angles, and very good data were obtained which gave a constant K^Ic fracture criterion independent of K^II.