In situ observations of the real-time wear of PMMA flat against steel ball under torsional fretting.pdfVIP

I t Z a b a A R R A K F I F W 1 t [ t ( c s a v e t ( v f f s a d o m 0 dWear 271 (2011) 2242– 2251 Contents lists available at ScienceDirect Wear j o ur nal ho me p age: www.elsev ier .com/ locate /wear n situ observations of the real-time wear of PMMA flat against steel ball under orsional fretting hen-bing Caia, Min-hao Zhua,?, Sha Yanga, Xin-biao Xiaoa, Xiu-zhou Lina, Hai-yang Yub Tribology Research Institute, Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China r t i c l e i n f o rticle history: eceived 1 September 2010 eceived in revised form 18 January 2011 ccepted 18 January 2011 eywords: a b s t r a c t Detailed fretting wear phenomena are usually hidden between the two compact contact interfaces. Direct or in situ observation of fretting wear is supposed to obtain time-dependent damage information. In this paper, the torsional fretting wear tests of plymethyl methacrylate (PMMA) flat against AISI 52100 steel spheres had been investigated on an improved test rig, which provides the real-time in situ observation, friction vibration and noise measurements. The running behaviours (frictional kinetics characteristics), wear mechanisms, oxidative behaviours and debris behaviours of the torsional fretting contact interfacesretting wear n situ and real-time observations riction vibration ear mechanism in combination with the friction vibration analyses were analyzed in detail. The results of observation suggested that a slight damage could be found in the partial slip regime. And the spindle-like detachment occurred in the mixed fretting regime, which presented a radial pattern distribution in the wear scar. The friction lateral vibration decreased accomp