During fretting, the removal of material by wear leads to an increase of contact stress in the stick zone. If elastic behaviour is assumed, the boundary between stick and slip zones does not move, wear eventually ceases, and a mode-I singularity of contact pressure is predicted after infinitely many cycles. For real materials, the development of singular stresses must be limited by plastic defo...

Due to the increased number of revision total hip arthroplasties (THAs) to correct pain secondary to fretting from modular hip stems, this study was conducted in an effort to correlate objective findings of serum cobalt (Co) levels, serum chromium (Cr) levels, and/or reactive tissue seen on metal artifact reduction sequence (MARS) magnetic resonance imaging (MRI) with a patient's need for revis...

Affluent western individuals are increasingly fretting about the carbon dioxide emissions from their lifestyle and energy use but one key issue, having fewer children, is little considered. Nigel Williams reports.

Fretting experiments were conducted on the (10 0) crystal (cubic) face of a single crystal Ni-base superalloy in two directions, /10 0S and /110S, to study the effect of crystallographic orientation on the fretting response in both partial slip and gross slip regimes. The study involved point contacts using a tungsten carbide (WC) ball with radius 10 mm tested at room temperature. Ball indentat...

Fretting fatigue is a degrading process which responsible for considerable amount of mechanical structure failure every year. In the present study, finite element model proposed to show effect bending moment on flat surface under fretting loading. The results that has major friction stress distribution two solids contact. Finite analysis predicts an increased damage when load applied as pure mo...