抄録
In the previous report, two controlling methods for the residual stress of Al/CFRP laminated material were explained, and also the investigation were carried out how to change its static mechanical properties by these controls. In this report the relation between stress controls and fatigue characteristics are investigated. The effect of residual stress controls was conspicuously revealed, especially on the fatigue characteristics. The crack propagation rate was reduced with the decrease of residual stress in the aluminum layers. Under a certain magnitude of mean stress and stress amplitude, it was found that crack propagation in a test piece where residual stress in the aluminum layers was converted from tension to compression was completely stopped. Even if residual stress controls were not carried out, it was shown that this material is overwhelmingly surperior to monolithic aluminum alloy plates in fatigue resistance. From this fact, it was shown that CFRP in the hybrid materials has a function to prevent crack propagation in the aluminum layers.
