Use of a load-pulsing technique to determine stress corrosion crack velocity PW. Slattery, J. Smit, EN. Pugh
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- Language:
- English
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- Physical Description:
- 1 online resource (13 pages) illustrations, figures, tables
- Place of Publication:
- West Conshohocken, Pa. ASTM International 1984
- Summary:
- A load-pulsing technique has been used to determine the velocity of transgranular stress-corrosion cracks in Admiralty Metal tested in a 15N aqueous ammoniacal solution. In this technique, small load pulses are periodically superimposed onto an otherwise constant tensile load during crack propagation, producing markings on the fracture surfaces which delineate the positions of the crack front. The spacing between crack-front markings (?x) was measured for values of the time interval between pulses (?t) in the range 2 to 500 s. A one-to-one correspondence was observed between pulses and markings in this range, so that the crack velocity was given by ?x/?t. The velocity was found to be constant over much of the crack length for each value of ?t, indicating that an extensive Stage II region exists in this system. The Stage II velocity was constant: 1.9 x 10-7 m s-1 for values of ?t greater than 100 s; this value of velocity is approximately five times larger than those obtained by conventional methods, and this difference is attributed to the influence of grain boundaries in the latter case. The Stage II velocity increased with decreasing ?t for ?t < 100 s, and this is attributed to fatigue effects. It is concluded that the load-pulsing method can provide a convenient and reliable technique for the determination of Stage II velocities for transgranular stress-corrosion cracking
- Notes:
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- Includes bibliographical references
- Online resource; title from publisher's website, viewed February 19, 2016
- Related Work:
- American Society for Testing and Materials. Selected Technical Papers
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