SEDL / STP / STP559-EB / STP38596S

Further Studies of Crack Propagation Using the Controlled Crack Propagation Approach

Weitzmann, RH
Senior development engineer, Space Sciences Laboratory, and professor of Mechanical Engineering, University of California, Berkeley, Calif.

Finnie, I
Senior development engineer, Space Sciences Laboratory, and professor of Mechanical Engineering, University of California, Berkeley, Calif.

Pages: 16    Published: Jan 1974

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Abstract

In a previous paper, a new fracture-toughness-measuring technique was presented which made it possible to evaluate the functional relationship between load and cracklength at the moment of crack initiation or arrest. It was demonstrated that this relationship is directly relatable to the strain energy release rate and experimental results were presented for a 7075-T6 aluminum alloy.

This paper presents the results of additional exploratory work as the concept is applied to more 7075-T6 aluminum, a 250 grade maraging steel, and AZ31B magnesium plate.