Stress intensity factors for semi-elliptical internal surface cracks in autofrettaged thick-walled cylinders
- 1 July 1997
- journal article
- research article
- Published by SAGE Publications in The Journal of Strain Analysis for Engineering Design
- Vol. 32 (5), 351-363
- https://doi.org/10.1243/0309324971513472
Abstract
Stress intensity factors for internal semi-elliptical surface cracks in autofrettaged cylinders with and without internal pressures applied are presented. The three-dimensional finite element based displacement method with the crack tip square-root singularity of stresses and strains simulated is used to evaluate the stress intensity factors along the crack front. Both allowing and disallowing the overlapping of crack faces are considered in this investigation, the latter being simulated by considering crack surface contact through a kind of interface element introduced into the cracked area. The residual stress distribution assumed to act on the crack face is obtained according to Tresca's yield criterion with the material assumed to be elastic-perfectly plastic. Three different overstrains of autofrettage are chosen. The results show that the stress intensity factor is generally underestimated if the crack contact that has actually occurred is ignored, which may lead to a danger in the assessment of either fracture strength or fatigue life. Implications of the stress intensity factor results are also briefly discussed, particularly for the prediction of fatigue lives, and it is shown that the full autofrettage treatment might be the most beneficial for increasing the fatigue life of cracks initiated from the inner core.Keywords
This publication has 14 references indexed in Scilit:
- Stress intensity factors for radial cracks in thick walled cylinders—II. Combination of autofrettage and internal pressureEngineering Fracture Mechanics, 1994
- Axial cracks in pressurised eroded autofrettaged thick cylindersInternational Journal of Fracture, 1993
- Partial closure and frictional slip of 3-D cracksInternational Journal of Fracture, 1993
- Eigenstrain methods in three-dimensional crack problems: An alternative integration procedureJournal of the Mechanics and Physics of Solids, 1993
- THE FATIGUE LIFE OF THICK‐WALLED AUTOFRETTAGED CYLINDERS WITH CLOSED ENDSFatigue & Fracture of Engineering Materials & Structures, 1991
- Fatigue crack growth in thick-walled cylinders under pulsating internal pressureEngineering Fracture Mechanics, 1989
- Stress Intensity Factors Caused by Residual Stress Fields in Autofrettaged TubingPublished by ASTM International ,1988
- Influence of Residual Stress on Fatigue Crack Growth in Thick-Walled CylindersPublished by ASTM International ,1988
- Strain behavior of pressurized cracked thick-walled cylindersExperimental Mechanics, 1982
- STRESS INTENSITY AND FATIGUE CRACK GROWTH IN MULTIPLY‐CRACKED, PRESSURIZED, PARTIALLY AUTOFRETTAGED THICK CYLINDERS*Fatigue & Fracture of Engineering Materials & Structures, 1981