SEDL / STP / STP627-EB / STP27397S

Measurement of Fast Crack Growth in Metals and Nonmetals

Congleton, J
Senior lecturer and senior research associate, University of Newcastle upon Tyne, Newcastle upon Tyne,

Denton, BK
Senior lecturer and senior research associate, University of Newcastle upon Tyne, Newcastle upon Tyne,

Pages: 23    Published: Jan 1977

Download this paper for $25 PDF (376K)          View License Agreement
Abstract

The use of a surface deposited resistance grid technique for crack velocity measurements and the extension of its general applicability to brittle solids by the incorporation of a circular time base for single shot, open shutter oscilloscope recording is described. For metal specimens a more direct crack velocity measurement procedure was used, and it was found that the dynamic potential drop across the faces of the propagating crack obeyed an equation of the form V^dynamic = A·v·c, where v is the crack velocity, c the crack length, and A an empirical constant. Crack velocity profiles for three-point-bend tests on polymethylethacrylate and a variously tempered tool steel are presented.