新型铝锂合金AA2198高频疲劳红外热耗散演化规律

doi:10.7527/S1000-6893.2020.24482

Abstract

Abstract: An infrared imaging technology is used to study the rule of fatigue heat dissipation evolution of a new Al-Li alloy AA2198 under a high-frequency fatigue test condition of 100 Hz. It is found that fatigue heat dissipation on specimens shows fluctuation characteristics under different stress conditions, with its average temperature inclined to increase with the rise of the loading stresses. However, the temperature rise on specimens during fatigue test is not obvious, and the amplitudes of temperature variation under different stress condition is generally smaller than 1℃. The beginning of fatigue test and the moment of fatigue fracture occurrence are accompanied by a rapid temperature rise. An energy conversion theory model is proposed to explain the evolution process of fatigue heat dissipation. Meanwhile, the residual compressive stress formed on specimen subsurface during the shot peening process helps to intensify the fatigue crack closure, inhibiting the temperature rise on specimens.

Key words: new Al-Li alloy, infrared imaging technology, high-frequency fatigue test, infrared heat dissipation, shot peening

CLC Number:

XU Luopeng, HU Shi, LIU Qingsong, WANG Qingyuan. High-frequency fatigue infrared heat dissipation of new Al-Li alloy AA2198[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(9): 224482-224482.

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High-frequency fatigue infrared heat dissipation of new Al-Li alloy AA2198

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