レーザーピーニングによる疲労特性の改善

摘要

Laser Peening is expected to improve the high cycle fatigue property of metal materials. The fatigue property is improved by competition between positive peening effects and the negative ones that are caused by laser peening. The major positive peening effects include an increase in the hardness of the material surface and compressive residual stress near the surface layer. On the other hand, the primary negative peening effect is an increase in the surface roughness. This paper introduces examples of these peening effects and fatigue property improvement by laser peening under such major fatigue loading conditions as axial loading, rotating bending, and plane bending.