<title>Experimental research on fatigue performance of a material by temperature change</title>

In order to characterize fatigue performance of a material by temperature change, rotary bending fatigue tests were performed for an aluminum alloy 2024 and a structural steel. The temperature changes of these specimens were successively measured using IR thermometer. The test were performed at a rate of 2850 rpm in air at room temperature. The stresses below proof stress or yield strength were applied to aluminum alloy specimens and structural steel specimens respectively. Results are as follows: During fatigue test, between both materials, obvious difference in temperature change to stress sequence was observed. Temperature change of the aluminum alloy specimen was influenced by the stress and the number of cycles applied. So the temperature change indicates that fatigue damage of the aluminum alloy cumulates non-linearly to the number of cycles. On the other hand, as the temperature change of the structural steel depended only on stress and not on number of cycles, it indicates that fatigue damage of steel cumulates linearly to the number of cycles.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.