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The double-torsion test configuration has been used to obtain crack growth information for a variety of materials. Recently critical reviews have suggested that certain assumptions used in the interpretation of double-torsion data are of questionable validity.
This paper presents experimental data for crack growth in glass specimens loaded in the double-torsion test configuration. The constant displacement rate technique was used to propagate cracks and velocity was measured continuously by superimposing a tuned-frequency sonic signal during cracking. The crack velocity profile as a function of position along the crack front was determined. The crack velocity at the tensile surface was measured as a function of crack length at constant load and the crack front shape was observed for various crack lengths.
double torsion testing, fractography, glass fracture mechanics, crack propagation, composite materials
Ceramic engineer, National Bureau of Standards, Washington, D.C.,
Mechanical engineer, Turbodyne Corp., Wellsville, N.Y.
Professor, N.Y.S. College of Ceramics, Alfred University, Alfred, N.Y.