微动疲劳损伤机理数值分析与实验研究

针对机械结构中广泛存在的微动疲劳问题进行数值分析和实验研究。应用有限元法对微动疲劳接触区的应力场分布进行了定量分析。进一步开展了实验研究,设计了微动疲劳实验系统,进行了微动疲劳实验。综合有限元分析和实验结果发现,滑移区和黏着区交界处的应力场存在突变,微动疲劳裂纹即在这一区域萌生,微动疲劳寿命随着接触载荷的增大而增大。

Numerical and Experimental Study on the Fretting Fatigue Damage Mechanism

This paper uses numerical and experimental method to investigate the fretting fatigue problems which exist widely in mechanical structures. The FEM method was used to quantitative analyze the stress distribution of the contact region of fretting fatigue. Furthermore, fretting fatigue experiment was carried out. A fretting fatigue testing system was designed to investigate the fretting fatigue mechanism. Take full consideration of the FEM and experimental results, it is found that there is a sharp change of stress at the edge between slip region and stick region, where the fatigue crack will initiate at this position; as the increase of the contact force, the fatigue life will be increased.