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Measuring stress intensity factors during fatigue crack growth using thermoelasticity
Article first published online: 1 JUN 2004
DOI: 10.1111/j.1460-2695.2004.00782.x
Issue
Fatigue & Fracture of Engineering Materials & Structures
Volume 27, Issue 7, pages 571–583, July 2004
Additional Information
How to Cite
DÍAZ, F. A., PATTERSON, E. A., TOMLINSON, R. A. and YATES, J. R. (2004), Measuring stress intensity factors during fatigue crack growth using thermoelasticity. Fatigue & Fracture of Engineering Materials & Structures, 27: 571–583. doi: 10.1111/j.1460-2695.2004.00782.x
Publication History
- Issue published online: 1 JUN 2004
- Article first published online: 1 JUN 2004
- Received in final form 26 February 2004
- Abstract
- Article
- References
- Cited By
Keywords:
- DeltaTherm;
- differential thermography;
- fatigue cracks;
- stress intensity factor (SIF);
- thermoelastic stress analysis (TSA)
ABSTRACT
Thermoelastic stress analysis has been developed in recent years as a direct method of investigating the crack tip stresses in a structure under cyclic loading. This is a consequence of the fact that stress intensity factors obtained from thermoelastic experiments are determined from the cyclic stress field ahead of a fatigue crack, rather than inferred from measurement of the crack length and load range. In the present paper the results of fatigue crack growth tests performed on welded ferritic steel plates are reported. From the results it can be observed that the technique is sensitive to the effects of crack closure and the presence of tensile and compressive residual stresses due to welding.