Sensitivity Analysis Of Fretting Parameters To Fretting Wear Behavior Of TC4 Alloy

TC4 titanium alloy with good comprehensive performance,high strength,low density,good processing performance,corrosion resistant performance is good wait for an advantage,should be widely in aerospace,biomedical,and the major equipment manufacturing and other engineering field,but because of poor wear resistance of titanium alloy,the micro is very sensitive,the shortcomings restrict its development and application in various fields more.Study of TC4 titanium alloy micro wear mostly focused on the experimental study,therefore,in this article,through experiment combined with finite element simulation to explore the law of the fretting wear,explore under different micro parameters(cycles,normal load and displacement amplitude),the change rule of micro wear after the test,through the friction coefficient,wear morphology and wear on the surface of the sample contact volume analysis,analyzed the TC4 titanium alloy under different parameters of micro damage mechanism,and micro wear finite element model is established,write UMESHMOTION subroutine for the model,The contact surface nodes were updated in real time to explore the fretting wear law,and a critical curve was obtained to distinguish the two slip states of fretting wear.Meanwhile,a finite element model of the real-time change of the friction coefficient was established to analyze the influence of the variable friction coefficient on the fretting wear.The main research contents of this paper are as follows:1.TC4 titanium alloy was studied under different micro parameters(cycles)and displacement amplitude of micro wear regularity,found under the same method to the load,the fretting wear of running state,with the increase of displacement amplitude gradually from the part of the slip zone to completely change slip zone,displacement amplitude,the greater the fretting wear,the more serious.However,when fretting is in the partial slip zone,the damage caused by fretting wear to the material is less than that in the complete slip zone.2.In the complete slip zone,it can be found that the wear marks on the sample contact surface are mainly abrasive wear and fatigue wear,and the friction coefficient fluctuates sharply.In the partial slip zone,it can be found that the wear mechanism in the contact zone is mainly adhesive wear and fatigue wear,and the friction coefficient is relatively stable.Under the same condition,the wear in the partial slip zone is much smaller than that in the complete slip zone.3.through the analysis of finite element simulation software,using Fortran language to write the finite element model is suitable for the fretting wear of UMESHMOTION subroutine,analysis under different displacement amplitude and normal load,fitting out a critical state curve to distinguish the part of the sliding zone and full slip zone,under the same conditions,can be found in the center of the part of the sliding contact of relative sliding distance is zero,the wear quantity is far less than fully slip zone.4.analysis of the friction coefficient of fretting wear finite element analysis results,the influence of the established finite element model of the friction coefficient and friction coefficient,the coefficient of friction of period and stable period,found that the results of the two finite element models have to slightly different,part of the slip zone constant friction coefficient model of wear depth is larger,but the wear volume is less than the variable friction coefficient model;In the complete slip zone,the wear depth and wear volume of the variable friction coefficient model are greater than that of the constant friction coefficient model.