研究了TC4合金在柱面-平面接触条件下的微动疲劳行为,分析了其微动疲劳损伤机制.结果表明:在试验条件下,微动区边缘的损伤特征以粘着磨损为主,而微动区中部则以磨粒磨损和接触疲劳为主.疲劳裂纹易于在微动区,特别是在蚀坑处萌生和扩展.促使微动疲劳裂纹萌生的因素:一是法向应力和切向摩擦力引起的材料表层塑性变形,二是微动磨损破坏了材料的表面完整性,造成了缺口应力集中效应.
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