FRACTURE MECHANICAL MODELLING OF BRITTLE CRACK PROPAGATION AND ARRESTS OF STEEL (2) -APPLICATION TO TEMPERATURE -GRADIENT TYPE TEST

A fracture mechanical model, which is based on local fracture stress criterion and takes account of the effect of crack closure stress by unbroken ligaments formed near the plate surface and of crack- bowing inside the plate, is extended to a crack propagation and arrest simulation in a specimen with temperature gradient. The model reproduced acceleration, deceleration and arrest behaviour of a crack. With increasing crack length and increasing temperature at crack-tip, thickness and length of the ligaments increase, thereby increasing the effect of crack closure by the ligament and bringing about crack-arrest. The crack is arrested at a point where dynamic fracture toughness versus crack velocity curve shows a minimum. Nominal arrest toughness calculated from applied stress and arrest crack length showed Arrenius type temperature dependency. The nominal arrest toughness weakly depends on temperature gradient.

• Supplemental Notes:
  • J Soc Naval Arch Japan, v 178, Dec 1995, p 545 [10 p, 10 ref, 1 tab, 16 fig]
• Authors:
  • Aihara, S
  • Machida, S
• Publication Date: 1995

Language

• Japanese

Subject/Index Terms

• TRT Terms: Cracking; Fracture mechanics; Temperature gradients
• Uncontrolled Terms: Crack propagation
• Old TRIS Terms: Crack arrest
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00728311
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Nov 4 1996 12:00AM