Fatigue behaviors of 2024 aluminum alloy at high temperatures have been investigated. The fatigue test was carried out with a sheet specimen loaded repeatedly, and heated by a small furnace during the test. The temperature range investigated was 100 - 250℃. It was found that the fatigue strength varied with the change in hardness of specimen, so the fatigue strength showed the maximum value at the temperature range of 200 - 225℃. In the case of rectangular specimen with a hole at the center, however, the fatigue strength was the highest at room temperature and decrased with temperature. Fatigue crack propagated along the principal stress plane for hardened specimens, but along the maximum shear stress pine for softened specimens. A single crack appeared and grew to fracture in repeated tension test, but a number of small cracks appeared and then a single crack was formed linking them in tension-compression test.
航空機用アルミニウム合金の疲労によるクラックの発生と伝ぱ(2)
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