Research On Friction And Wear Behaviors Of The Coupling Of Electromagnetic Filed On A Pin-on-disc Friction Pair

Friction and wear with electric current is a problem in tribology under special working condition,and is a process of electric current contact.A heat coupling will produce a variety of heat in this process,which these thermal will result in temperature increment of the friction pairs.By ANSYS10.0 finite element software,experimental study on friction and wear behaviors with electrical current was carried out on a pin-on-disc tester.The two-dimensional finite element analysis model is established through the pin-on-disc friction pair: Temperature field and stress field change under different intensity of magnetic,relative sliding velocity and normal pressure were studied.1.The results and conclusions were as follows:By analyzing mechanical friction for the stainless steel material,these conclusions were drawn so follow:(1)While the relative sliding displacement keep unchanging and the relative velocity is 50km/h,the maximum temperature rises with the increasing of normal pressure;The maximum equivalent stress rises with the increasing of normal pressure,and appears in the lower right corner on a pin-on-disc contacting.2.By analyzing electromagnetic induction for the stainless steel material,these conclusions were drawn so follow:(1)When loading the magnetic field strength(flux density),the maximum temperature value rises from outer to inner,and it is consistent with the skin effect;(2)While the relative sliding displacement keep unchanging and the relative velocity is 50km/h,with the normal pressure is 40 N,as the maximum temperature(the maximum equivalent stress)rises with the increasing of the magnetic field strength(flux density);(3)The maximum equivalent stress appears in the lower right corner on a pin-on-disc contacting,and occurs abrasion.3.By analyzing coupling for the stainless steel material,these conclusions were drawn so follow:(1)While the relative sliding displacement keep unchanging and the relative velocity is 50km/h,and the normal pressure is 40N: The maximum coupling temperature slowly rises with increasing of the magnetic field strength,and appears in the lower right corner on a pin-on-disc contacting;The maximum equivalent stress rises with increasing of the magnetic field strength;The wear of contact place appears in the lower right corner on a pin-on-disc contacting;(2)While the relative sliding displacement keep unchanging and the magnetic field strength is 10000A/m,and the normal pressure is 40N: the maximum coupling temperature decreases with increasing of the relative velocity;The maximum coupling temperature appears in the lower right corner on a pin-on-disc contacting;The maximum equivalent stress decreases with increasing of the relative velocity;The maximum equivalent stress range increases with increasing of the relative velocity;It appears in the lower right corner on a pin-on-disc contacting;(3)While the relative sliding displacement keep unchanging and the magnetic field strength is 10000A/m,and the relative velocity is 50km/h: with the normal pressure sampling 0~80N,the maximum coupling temperature is effect between the mechanical friction and the electromagnetic heat;With the normal pressure sampling greater than 80 N,the maximum coupling temperature rises effect the mechanical friction;The maximum coupling temperature slowly rises with increasing of the normal pressure,and appears in the lower right corner on a pin-on-disc contacting;The maximum equivalent stress rises with increasing of the normal pressure;The maximum equivalent stress range increases with increasing of the normal pressure;It appears in the lower right corner on a pin-on-disc contacting;The equivalent stress decreases from outer to inner.4.By analyzing coupling the temperature field and the stress field for the stainless steel material,these conclusions were drawn so follow:(1)The map of the temperature field and the stress field known: When the heat flux is relatively large,as the maximum temperature and the maximum equivalent stress clearly show a trend of “U” with increasing of the normal pressure;For the different sliding velocity,a variation of “U” curve is more obvious in low speed;(2)The factors of wear extent have the normal pressure,the magnetic field strength,and the relative velocity.