Thermography detection of fatigue damage

B. Yang, P. K. Liaw, H. Tian, L. Jiang, H. Wang, J. Y. Huang, R. C. Kuo, J. G. Huang, D. Fielden

Research output: Contribution to conferencePaperpeer-review

Abstract

A high-speed and high-sensitivity thermographic infrared (IR) imaging system has been used for nondestructive evaluation of temperature evolutions during fatigue testing of reactor pressure vessel (RPV) steels. During each fatigue cycle, the specimen temperature was detected to oscillate within approximately 0.5°C depending on the loading conditions and test materials. When the applied stress reached the minimum, the temperature typically approached the maximum. However, the applied maximum stress did not necessarily correspond to the minimum temperature. A theoretical framework was attempted to predict temperature evolutions based on thermoelastic and inelastic effects, and heat-conduction models. Temperature oscillation during fatigue resulted from the thermoelastic effects, while the increase in the mean temperature derived from the inelastic behavior of the materials. The predicted temperature evolutions during fatigue were found to be in good agreement with the thermographic results measured by the advanced high-speed and high-sensitivity IR camera. Furthermore, the back calculation from the observed temperature was conducted to obtain inelastic deformation and stress-strain curves during fatigue.

Original languageEnglish
Pages249-258
Number of pages10
StatePublished - 2002
EventMechanisms and Mechanics of Fracture: The John Knott Symposium - Columbus, OH, United States
Duration: Oct 7 2002Oct 10 2002

Conference

ConferenceMechanisms and Mechanics of Fracture: The John Knott Symposium
Country/TerritoryUnited States
CityColumbus, OH
Period10/7/0210/10/02

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