【摘要】 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。更多还原

【Abstract】 The fretting fatigue behavior of TC4 alloy was investigated using cylinder-plane configuration.Based on the experimental results,the damage mechanism of fretting fatigue failure was discussed.The damage of fretting scar edge was caused by adhesive wear,and the center part of fretting scar was damaged by abrasive wear and contact fatigue.Fretting fatigue crack initiation tended to occur in fretting scar,especially from grinding pits.There were two factors responsible for specimens damage,one was the plastic deformation of the material layers adjacent to the contact surface caused by normal stress and tangential friction,another was the effect of notch stress concentration caused by surface damage.更多还原