ISSN: 1546-962X
Page Count: 21

Assessment of Plane Stress Tearing in Terms of Various Crack Driving Parameters
Naumenko, VP
Leading Scientist and Senior Scientist, G.S. Pisarenko Institute for Problems of Strength,

Volkov, GS

Abstract

The important role of mechanical parameters characterizing the global fracture behavior of a thin rectangular plate is demonstrated through comparison of various approaches to the investigation of ductile tearing at large amounts of stable crack extension. Tensile tests have been performed on middle-cracked specimens at different in-plane constraint states and on cruciform specimens. The latter geometry is treated as a physical counterpart of the basic structural element usually considered in model descriptions of tension- and/or compression-dominant crack geometries. Attention is focused on the simplest practical problem, namely, assessing the critical states of a center through crack under remote uniaxial tension. The case in point is a comprehensive assessment of the structural behavior of a thin-wall component where failure loads, displacements, and subcritical crack extensions must all be predicted from the crack growth data for a laboratory-size specimen of standard geometry.

Keywords:
plane stress tearing, boundary constraint, stress biaxiality, instability, energy dissipation rate, crack-tip opening angle, crack-mouth opening angle, crack volume ratio, ductile aluminum alloy

Paper ID: JAI12045
DOI: 10.1520/JAI12045
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