Cu基粉末冶金摩擦元件接触压力仿真与试验

Sintered bronze friction pair contact pressure simulation and experiment

为准确获得摩擦副接触压力在Cu基粉末冶金摩擦片接合过程中的动态分布情况,简化离合器结构,建立Cu基粉末冶金摩擦结构压力仿真分析3-D有限元模型,获得摩擦元件接触压力分布结果,并分析造成径向和周向压力不均的主要原因.为进一步验证压力仿真的准确性,并确定摩擦元件滑摩状态下的接触压力动态变化,设计并实现了通过应变测量间接反推获得摩擦元件接触压力的动态测试试验.进行各个测量点的标定并绘制标定曲线,完成应变值的采集.仿真和试验结果表明:摩擦副的径向和周向均存在接触压力分布不均的现象;径向压力分布关系主要受加载结构影响;周向分布关系的主要影响因素为弹性模量、沟槽结构和表面不平度等;摩擦副滑动过程中接触表面动态压力分析表明,接触压力动态测量曲线有明显的周期波动,随着外载荷的增加,接触压力总是趋向于更加均匀的分布状态.

To calculate the contact pressure of friction pair,a 3-D finite element friction model of sintered bronze is established by simplifying the structure of clutch. Accurate contact pressure distribution of friction pair is obtained by the study of friction characteristics. The distribution results and main reasons of contact pressure are analyzed by evaluating the data of radial and circumferential directions. To verify the computation and confirm the contact pressure dynamic change under sliding friction condition,the dynamic friction element contact pressure experiment is designed. The experiment is based on the strain measuring technology,the measurement points are calibrated,the strain data is collected and the pressure curves are drawn. The simulation and experimental results show that the friction pair contact pressure is uneven on radial and circumferential directions. Radial direction distribution is influenced by loading structure. The influences of circumferential direction are elasticity modulus,groove and roughness etc. Dynamic measurement curves of contact pressure show obvious cyclic quality. Contact pressure tends to be more uniform along with load increase.