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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• 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
• 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