SEDL / STP / STP559-EB / STP38595S

Further Aspects of Fracture Resistance Measurement on Thin Sheet Material: Yield Stress and Crack Length

Sullivan, AM
Consultant and metallurgist, Fracture Machanics, Metallurgy Division, Naval Research Laboratory, Washington, D. C.

Stoop, J
Consultant and metallurgist, Fracture Machanics, Metallurgy Division, Naval Research Laboratory, Washington, D. C.

Pages: 12    Published: Jan 1974

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Abstract

The fracture resistance value, K^c, has been determined for a number of alloys of aluminum, titanium, and steel and found to depend inversely upon the material yield stress. During this investigation various initial crack lengths, 2a^o, were employed.

Analysis of the data has disclosed that the amount of crack extension, that is, final crack length, 2ac, appears to be influenced by the initial crack length. Plotted on a log-log scale of (ao/ac) versus β=[1B(cKybσ)2], statistical analysis justifies a relationship conforming to the equation ln⁡10(ao/ac)=A-Bln⁡10β which can be transformed to (aoac)=AβB

The development of these relationships can be of real assistance in the design of a standard initial screening test for K^c.