Weight functions and stress intensity factors for longitudinal semi-elliptical cracks in thick-wall cylinders
- Univ. of Waterloo, Ontario (Canada). Dept. of Mechanical Engineering
Semi-elliptical surface cracks are occasionally found in pressure vessels and pipes during service or production. Subsequent fracture and fatigue analysis of such cracks is of great practical interest, and requires the determination of stress intensity factors. Here, weight functions for the surface and the deepest point of an internal longitudinal semi-elliptical crack in a thick-wall cylinder (R{sub i}/t = 1) were derived from a general weight function and two reference stress intensity factors. For several linear and nonlinear crack face stress fields, the weight functions were validated against finite element data. Stress intensity factors were also calculated for the Lame through the thickness stress distribution induced by internal pressure. The weight functions appear to be particularly suitable for fatigue and fracture analysis of surface semi-elliptical cracks in complex stress fields. All stress intensity factor expressions given in the paper are valid for cylinders with the inner-radius-to-wall-thickness ratio, R{sub i}/t = 1.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 131631
- Journal Information:
- Journal of Pressure Vessel Technology, Vol. 117, Issue 4; Other Information: PBD: Nov 1995
- Country of Publication:
- United States
- Language:
- English
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