金属橡胶内螺旋金属丝微动磨损预测模型研究

Fretting Wear Prediction Model of Spiral Metal Wire in Metal Rubber

目前金属丝微动磨损预测模型多适用于垂直接触,而锐角交叉下的模型存在计算过程繁琐、表征不全面等不足,难以便捷有效地预测金属橡胶内部复杂无序的金属丝磨损情况。基于有限元分析,确定螺旋曲率对磨损结果的影响极小,因此将金属橡胶内部螺旋金属丝接触对微元理想化为直金属丝接触对,探究无序接触下金属丝磨损特征的演化规律。结果表明,无序接触状态下的磨损特征演化规律与金属丝接触夹角大小密切相关。依据几何学分析,得到任意锐角接触下磨损磨痕位于金属丝1/2接触夹角处的特殊位置关系,据此建立任意接触形态下的微动磨损演化预测模型,并利用已有文献中的金属丝微动磨损试验结果对预测模型进行验证。结果显示,建立的任意锐角下的磨损演化模型能够较准确地预测金属丝的磨损结果,误差均在15%以内。研究结果为预测金属橡胶内部金属丝微动磨损和使用寿命提供一定理论基础。

At present,most metal wire fretting wear prediction models are suitable for vertical contact,while the models under acute angle intersection have some shortcomings,such as cumbersome calculation process and incomplete characterization,which are difficult to predict the complex and disordered metal wire wear in metal rubber conveniently and effectively.Therefore,based on the finite element analysis,it was determined that the spiral curvature has little effect on the wear results.Therefore,the spiral metal wire contact pairs in the metal rubber were idealized into straight metal wire contact pairs to explore the evolution law of the metal wire wear characteristics under disordered contact.The results show that the evolution of wear characteristics under disordered contact condition is closely related to the contact angle of wire.According to the geometric analysis,the special position relationship of the wear mark located at the 1/2 contact angle of the metal wire under arbitrarily acute contact was obtained,and the fretting wear evolution prediction model under arbitrarily contact shape was established.The prediction model was verified by the fretting wear test results of metal wire in the existing literature.The results show that the established wear evolution model under arbitrarily crossing angle can accurately reflect the wear results of metal wires,and the error is less than 15%.The research results can provide a theoretical basis for predicting the fretting wear and service life of metal wire in metal rubber.