Thermographic Determination of Fatigue Damage

Abstract

The energy released due to hysteresis effects in cyclically loaded materials can be used to predict where fatigue cracks are likely to initiate and to determine the stage of fatigue life. In the present study, thermography is used to monitor the surface temperature distributions on a series of double-notched, mild steel fatigue specimens cyclically loaded in bending. The results indicate that the fatigue life of the material encompasses three thermal stages, each of which is indicative of the fatigue damage the material has sustained. This information can be used to avoid in-service fatigue failures.

Infrared temperature mapping of ULTIMET alloy during high-cycle fatigue tests

“…One On the other hand, r value was markedly improved by parameter that has not been utilized widely during fatigue decreasing the carbon content from 0.0035 to 0.0009 pct, testing is temperature. [9,10] In the The bigger the ferrite grain size of annealed steel, the higher present study, a state-of-the-art IR camera was employed to the r value. The difference in r value between of a specimen during cyclic fatigue testing increases as a two steels is 0.2 to 0.3 at all annealing temperatures.…”