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Contact mechanics; Adhesion; Friction; Tribology; Wear; Surface Cracking

Antonio Papangelo's picture

Numerical and experimental analysis of the bi-stable state for frictional continuous system

Friction induced vibrations are a very well known problem in engineering applications. Sometimes they are referred to be unpredictable, intermittent, capricious (!!!) and particularly experimentalists know this very well. Here, by means of numerical simulations and experimental measurements, we highlight how capriciousness may arise from the multistable behavior of frictional systems, i.e. their characteristic to show multiple stable solutions for the same set of governing parameters. Hence initial conditions and perturbations become crucial.

Antonio Papangelo's picture

Effect of Wear on the Evolution of Contact Pressure at a Bimaterial Sliding Interface

The eigenfunction method pioneered by Galin (J Appl Math Mech 40: 981–986, 1976) is extended to provide a general solution to the transient evolution of contact pressure and wear of two sliding elastic half-planes, under the assumption that there is full contact and that the Archard–Reye wear law applies. The governing equations are first developed for sinusoidal profiles with exponential growth rates.

Antonio Papangelo's picture

Can wear completely suppress thermoelastic instabilities?

ThermoElastic Instabilities (TEI) occur in sliding bodies at sufficiently high speed because a small thermoelastic disturbance tends to localize the contact, leading to “hot spots”. The role that wear plays in TEI has been studied briefly and only on highly idealized cases. We extend and complete in detail a model of Dow and Burton who studied the specific configuration of a blade sliding on a rigid halfspace normal to its line of contact. We find there is a limit value of wear coefficient, that can be estimated by simple equations, above which TEI is completely eliminated.

Antonio Papangelo's picture

The effect of wear on ThermoElastic Instabilities (TEI) in bimaterial interfaces

There is ample evidence of ThermoElastic Instabilities (TEI) occurring in sliding contacts. The very first experiments of JR Barber in 1969 suggested wear interacts in the process of localization of contact into ”hot spots”. However, studies on the interaction of TEI with wear are scarce. We consider the case of two sliding halfspaces and make a perturbation analysis permitting the formation of waves migrating over the two bodies, in presence of wear. We find that for exactly identical bodies wear does not affect the stability boundary.

Ramin Aghababaei's picture

Adhesion contribution to the process of adhesive wear

I hope this work be of interest to some of you, in particular, those in the field of tribology, contact and damage mechanics. We examined the opposite contribution of interfacial adhesion into the process of surface material removal during adhesive wear.

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