金属積層造形技術で製造されたアルミニウム合金の回転曲げ疲労特性に及ぼす形状因子の影響

抄録

Metal additive manufacturing technology can easily produce metal parts with complex shapes and is being considered for application in a variety of fields. However, it is known that the fatigue strength of products manufactured using this technology is low due to internal porosity and surface roughness generated during fabrication. In this study, the effect of stress concentration sources on the rotating bending fatigue strength of aluminum alloys, AlSi10Mg alloys, which is expected to be applied to lightweight components, it was examined by changing the hatch size. The results of tests using a quadruple rotating bending fatigue tester showed that surface treatment to remove stress concentration sources significantly improved fatigue strength. Furthermore, it was considered that the variation in the size of near-surface defects in the smoothed specimens may affect the variation in fatigue life.