SEDL / STP / STP743-EB / STP28790S

Benefits of Overload for Fatigue Cracking at a Notch

Underwood, JH
Materials engineers, U.S. Army Armament Research and Development Command, Large Caliber Weapon Systems Laboratory, Benet Weapons Laboratory, Watervliet, N.Y.

Kapp, JA
Materials engineers, U.S. Army Armament Research and Development Command, Large Caliber Weapon Systems Laboratory, Benet Weapons Laboratory, Watervliet, N.Y.

Pages: 15    Published: Jan 1981

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Abstract

Tests are described which measure the effect of compression overload on fatigue crack initiation and growth from a 0.1-mm-radius notch in alloy steel K^Ic specimens.

Other tests are described which measure the effect of tension overload on fatigue crack initiation and growth from a 3.4-mm-root-radius notch in similar specimens.

The effect of overload on the number of cycles required for crack growth is described for both types of tests in relation to a residual stress model.