局所的にSiC_p/Al_2O_3ハイブリッドMMCで強化されたAl鋳造合金の破壊機構の評価(S07-4 複合材料II,S07 メゾスケールにおける先進材料の力学と強度・機能評価)

抄録

To contribute to a better understanding of the fracture mechanisms and stress distributions of aluminum cast alloy locally reinforced by SiC particle and Al_2O_3 whisker hybrid MMC a symmetrical four-point bending test was precisely analyzed experimentally and numerically. The four-point bending test was performed on straight beam specimens of rectangular cross section in the MTS machine, using special bending fixtures. The fracture mechanism and the fracture path ahs been investigated on the fracture surfaces. Crack initiation location and fracture surface morphologies have also been investigated. The stress distribution of SiC particle/Al_2O_3 whisker and homogeneous material joint have been calculated. Both the experimental results and the finite element simulation results show that the critical location for fracture is a region on MMC side near the interface.