OBSERVATIONS OF FIBROUS FRACTURE MODES IN A PRESTRAINED LOW-ALLOY STEEL
Crack-opening displacement (COD) tests have been performed on prestrained QIN (HY-80) low-alloy steel. In specimens containing fatigue precracks the COD is largely insensitive to prestrains below 0.17, but a significant reduction in COD occurs at higher prestrains. Measurements of the yield-stress variation with tensile strain have enabled the effects of prestrain on fracture toughness to be estimated. Apart from a small initial increase, the general effect of prestrain is to reduce fracture toughness. The decrease in toughness with prestrain is accompanied by the development of zig-zag fractures. Crack growth appears to be intermittent and occurs by a process of shear decohesion along paths corresponding to either the spiral slip-lines emanating from a blunted crack-tip, or, at lower displacements, the straight slip-lines emanating from a sharp crack.
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Availability:
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Corporate Authors:
Metals Society
1 Carlton House Terrace
London SW1Y 5DB, England -
Authors:
- Clayton, J Q
- Knott, J F
- Publication Date: 1976-2
Media Info
- Features: References;
- Pagination: p. 63-71
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Serial:
- Metal Science
- Volume: 10
- Issue Number: 2
- Publisher: Metals Society
- ISSN: 4E
Subject/Index Terms
- TRT Terms: Alloy steel; Cracking; Fracture mechanics; Steel
- Uncontrolled Terms: Crack propagation; Fracture
- Subject Areas: Materials; Railroads;
Filing Info
- Accession Number: 00156211
- Record Type: Publication
- Source Agency: Engineering Index
- Files: TRIS
- Created Date: Jul 19 1977 12:00AM