EFFECT OF ALUMITE TREATMENT ON ULTRA-LONG-LIFE FATIGUE PROPERTY FOR ALUMINUM ALLOY IN ROTATING BENDING

摘要

Various kinds of aluminum alloys have been used as structural materials from a viewpoint of the lightweight. Ease of recycling is another reason why they are widely used as mechanical components in various fields of the present industries. Long-term use of the mechanical structures provides us a saving of the resources and the reduction of the environmental load to the globe in the process of material making. Accordingly, the long-term service of the mechanical products can give a key technology to keep the sustainable development of our society. However, fatigue characteristics of such aluminum alloys in the long life regime remain unsolved in comparison with ferrous metals. Thus the fatigue properties in the high cycle regime for an aluminum alloy with some different alumite treatments were experimentally examined by using a multi-spindle rotating bending fatigue-testing machine. Experimental results are discussed, paying a particular attention to the effect of the surface treatments.