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Fatigue Threshold Considerations During Crack Propagation

[+] Author Affiliations
Lichun Bian, Jae-Kyoo Lim

Chonbuk National University, Chonju, South Korea

Paper No. PVP2002-1211, pp. 211-220; 10 pages
doi:10.1115/PVP2002-1211
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • New and Emerging Computational Methods: Applications to Fracture, Damage, and Reliability
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1949-3
  • Copyright © 2002 by ASME

abstract

The angled crack problem has been given special attention in the recent years by fracture mechanics investigators due to its close proximity to realistic conditions in engineering structures. In this paper, an investigation of fatigue crack propagation in steel pipes containing an inclined surface crack is presented. The inclined angle of the crack with respect to the axis of loading varied between 0° and 90°. During the fatigue tests, the growth of the fatigue crack was monitored using the AC potential drop technique. Based on the concept of the effective stress intensity factor range, Δkeff , the rate of fatigue crack propagation, db/dN, is postulated to be a function of the effective strain energy density factor range, ΔSeff . Subsequently, this concept is applied to predict crack growth due to fatigue loads.

Copyright © 2002 by ASME

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