耐食性アルミニウム合金(A5083P-O)の低サイクル疲労強度に関する研究

概要

論文の詳細を見る
The axial strain controlled low-cycle fatigue tests at room temperature in air, data analysis and the fractographic study have been carried out on aluminum alloy, A5083P-O, This alloy is the most strong among non-heat-treatable alloys and has high corrosion resistance and good weldability, so it is applied extensively in marine vessels, vehicles, cryogenic tanks, pressure vessels and so on. Here, firstly, the static tesile properties and the distinctive slant fracture are studied. Then the relationships between crack initiated life and fatigue life, between fictitious stress amplitude and fatigue life and between total strain amplitude and fatigue life are obtained. The extreme values of repeated nominal stresses against the number of cycles show a good stability at total strain ranges from 0.36% to 1.30%. The result is compared with the result of the fatigue curves of Inconel 600 and pure titanium, with the other results of load controlled fatigue test on the same A5083P-O and with the same strain controlled fatigue test results on A5083P-O. Finally, it is shown that the fatigue crack propagation has three stages : fatigue crack inception stage, radial stable propagaion stage and final unstable fracture stage.
東海大学の論文