摘要
钢丝间的微动磨损以及由此引起的钢丝的疲劳断裂是提升钢丝绳失效的主要原因之一。以6×19点接触式提升钢丝绳为研究对象,将钢丝绳中钢丝的微动损伤过程进行实验室模型化,在自制的钢丝微动磨损试验机上进行钢丝试样的微动磨损实验,考察接触载荷和微动时间变化对钢丝试样磨损深度的影响。结果表明,钢丝试样的微动磨损深度随着接触载荷和微动时间的增加而呈增长趋势,但由于接触面积和接触应力在微动磨损过程中随着接触载荷和微动时间的变化而变化,使磨损深度在不同磨损工况下增长趋势不同。建立的钢丝接触有限元模型表明,接触区中心的最大接触应力随着接触载荷的增加而增大,随着嵌入深度的加深而减小。其结果验证了试验过程中接触面积和接触应力对磨损深度的影响关系。
Fretting wear and its induced fatigue and fracture of wires was one of the major failure modes of the hoisting ropes. The 6 × 19 point contact hoisting rope was taken as an example and a model for the fretting wear of wire rope was developed in laboratory, h series of tests were performed on the serf-made fretting wear test rig to examine the fretting wear of steel wires, by taking the wear depth of steel wires as a characterization parameter describing the fretting wear in relation to contact load and fretting time. The results demonstrates that the fretting wear depth increases with the increasing of the contact load and fretting time. However, the increasing trends of wear depth varies at different fretting wear conditions due to the simultaneous variations of contact area and contact stress in the process of fretting wear. The developed finite element model of contact condition between wire speeimens shows that the maxmum stress in the center of contact zone increases as the contact load increases and decreases as the insert depth deepens, which validated the experimental results that the contact area and contact stress had an effect on the wear depth.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2007年第1期148-151,共4页
Journal of Mechanical Strength
关键词
钢丝
微动磨损
磨损深度
接触力学
Steel wires
Fretting wear
Wear depth
Contact mechanism
