SYMPOSIA PAPER Published: 01 January 1981
STP28294S

Experimental Observation of Crack Velocity and Crack Front Shape Effects in Double-Torsion Fracture Mechanics Tests

Source

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.

Author Information

Michalske, TA
National Bureau of Standards, Washington, D.C.
Singh, M
Turbodyne Corp., Wellsville, N.Y.
Frechette, VD
N.Y.S. College of Ceramics, Alfred University, Alfred, N.Y.
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Details
Developed by Committee: E08
Pages: 3–12
DOI: 10.1520/STP28294S
ISBN-EB: 978-0-8031-4811-6
ISBN-13: 978-0-8031-0731-1