During high-temperature ball-on-disc tests of aluminium against steel, hot aluminium deformsand wear track evolves. The individual contributions of ploughing and shearing to theapparent friction and the contact pressure are unknown. The aim of this chapter was todevelop a model capable of determining these parameters. It was found that during high-temperature ball-on-disc tests,...

Metal-on-polyethylene total disc replacements have been an alternative to spinal fusion in the lumbar spine under certain indications for more than a decade. Recently, cervical total disc replacement has also become an alternative to cervical fusion. Knowledge acquired from years of in vitro simulator studies on other joint replacements has highlighted the risks associated with premature wear d...

Changing the cutter is an essential procedure in tunnel boring machine (TBM) operations. The danger and low efficiency of manually replacing disc has led engineering equipment designers to study technologies automate changing cutters. key step design a new integrated (simplifying replacement process) facilitate robot operation. Until now, research systems mainly relied on inspiration. In this p...

Button cutters are commonly used in hard rock drilling because the inserted carbide buttons provide exceptional wear resistance, impact and high strength challenging geological formations. One of most pressing issues designing a button cutter is to study breaking mechanisms buttons. In this study, three-dimensional discrete element method (DEM) was employed investigate mechanism cutting perform...

STATEMENT OF PROBLEM As a physical property, wear resistance of the materials used in the fabrication of orthodontic retainers play a significant role in the stability and long term use of the appliances. OBJECTIVES To evaluate the wear resistance of two commonly used materials for orthodontic retainers: Acropars OP, i.e. a polymethyl methacrylate based material, and 3A-GS060, i.e. a polyethy...