SEDL / STP / STP627-EB / STP27399S

Towards Development of a Standard Test for Measuring K^Ia

Crosley, PB
Principal scientist and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

Ripling, EJ
Principal scientist and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

Pages: 20    Published: Jan 1977

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Abstract

Measurement of K^Ia requires the production of a run-arrest segment of crack extension in a laboratory specimen and evaluation of the stress intensity factor a short time after the crack has arrested. The crack should propagate under conditions which simulate propagation in a thick section. Progress towards meeting these requirements with tests on tapered-double-cantilever-beam specimens is described. Aspects which require further clarification are discussed.