Nondestructive Estimation of Remaining Fatigue Life: Thermography Technique
A technique for the estimation of remaining fatigue life (RFL) of metallic specimens when subjected to cyclic load is presented. The procedure includes evaluation of thermal response of the metal and its correlation with the fatigue life. Results are presented for a series of fully reversed fatigue tests with Stainless Steel 304L at room temperature. It is demonstrated that the slope of temperature rise as a function of time is a good candidate for estimation of RFL. Once the temperature slope is measured, the remaining useful life of the specimen can be effectively estimated.
KeywordsRemaining fatigue life Nondestructive testing Infra-red thermography
The authors are grateful to one of their colleagues, Mr. Md. Liakat Ali of LSU Center for Rotating Machinery for assistance in performing one of the validation tests reported in this article.
- 1.Attermo, R., Ostberg, G.: Measurements of the temperature rise ahead of a fatigue crack. Int. J. Fract. Mech. 7, 122–124 (1971)Google Scholar
- 4.Henneke, E.G., Reifsnider, K.L., Stinchcomb, W.W.: Thermography—an NDI method for damage detection. J. Met. 31, 11–15 (1979)Google Scholar
- 8.Huang, Y., Li, S.X., Lin, S.E., Shih, C.H.: Using the method of infrared sensing for monitoring fatigue process of metals. Mater. Eval. 42, 1020–1024 (1984)Google Scholar
- 12.Peckner, D., Bernstein, I.M.: Handbook of Stainless Steels. McGraw-Hill, New York (1977)Google Scholar