Notch root crack closure under cyclic inelasticity

Sunder, R (1993) Notch root crack closure under cyclic inelasticity. Fatigue amp; Fracture of Engineering Materials and Structures, 16 (7). pp. 677-692. ISSN 8756-758X

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Abstract

Aluminum alloy sheet coupons with a central hole were tested in fatigue under specially designed programmed load sequences. Electron microscopy of the fatigue fracture surfaces showed striation mode fatigue crack extension up to more than a millimeter before onset of rapid failure. rack opening stress was determined from striation patterns. Under variable amplitude loading and conditions of notch root cyclic inelasticity, crack opening stress exhibits noticeable hysteresis. The hysteresis is attributed to a difference between crack closure and opening stresses. A linear model of this phenomenon appears to describe observed behavior.

Item Type: Journal Article
Uncontrolled Keywords: Aluminum base alloys;Mechanical properties;Sheet metal; Fatigue failure;Crack propagation;Crack initiation;Notch sensitivity;Crack opening displacement;Aluminum alloys;Crack closure;Inelastic stress;Metal sheets;Electron microscopy; Fractography;Load distribution (Forces);Metal fatigue;Stress analysis;Stress-strain relationships
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Structures Division
Depositing User: M/S ICAST NAL
Date Deposited: 26 Mar 2008
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4271

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