Abstract
A theoretical model describing heat generation in the plastically deforming region near a crack tip under cyclic loading conditions has been developed. It predicts crack-tip temperature as a function of stress-intensity amplitude, cyclic loading frequency, time under load, and material parameters. Crack-tip temperatures are measured in AISI 4135 steel at a loading frequency of 20 Hz by employing a scanning infrared camera system. Measured temperatures compare reasonably well with values predicted by the theoretical model. Temperature changes are small under prevailing testing conditions.
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