617 異なる粒子径を有するSiC粒子強化Al合金の高温疲労挙動(GS.F-3 疲労)

概要

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Fully reversed axial fatigue tests have been performed at 150℃ and 250℃ using smooth specimens of SiC-particulate reinforced aluminium alloy composites with different particle sizes and high temperature fatigue behaviour was discussed on the basis of crack initiation, small crack growth and fractographic analysis. Fatigue strength decreased with temperature raise, particularly remarkable at 250℃. The particle size dependence of fatigue strength was seen at room temperature and 150℃, but it tended to disappear at 250℃. Crack initiation behaviour was dependent on temperature and particle size, and small crack growth rates were considerably faster at 250℃ than at room temperature and 150℃ when they were characterized in terms of the maximum stress intensity factor normalized with respect to elastic modulus.
一般社団法人日本機械学会の論文
2007-10-24