アルミニウム合金製構造体の疲労寿命評価 Fatigue Life Evaluation of Welded Joints of an Aluminum Alloy
In order to clarify the fatigue behavior of welded joints connecting an outer plate to the keel of a ship made of JIS A 5083 alloy, constant displacement amplitude fatigue tests of the welded joints (four types) were conducted. Additionally, a finite element method (FEM) analysis and residual stress measurements were carried out. The FEM analysis gave a fairly good estimation of the elastic strain distribution near the toe of the weld. The life evaluation procedure was proposed based on Dowing's stress based approach.<br>By analysis incorporating quantitatively the effects of stress concentration, welding residual stress and mean stress on the fatigue life of the welded joints, the relationship giving the 95% confidence limits between the equivalent completely reversed stress amplituede σ<sub>ar</sub> and cycles to failure N<sub>f</sub> was given by the following formula.<br>σ<sub>ar</sub>(MPa)=A⋅N<sub>f</sub><sup>B</sup>: A=702-453, B=-0.17.<br>This empirical relation appears very useful for designing favorable welded joints for shipbuilding purposes.
圧力技術 35(2), 58-64, 1997-03-25
HIGH PRESSURE INSTITUTE OF JAPN(HPI)