Abstract Piston rings cause significant friction losses within internal combustion engines. Especially the first compression ring, which is pressed onto liner by high cylinder pressure, contributes significantly to total loss of piston assembly. The tribological behavior oil scraper ring mainly related pretensioning force and can lead even at low idle speed. Due this, there always a markable ri...

Abstract The loss of support beam elements in Italian precast buildings is one the main vulnerabilities recorded past earthquakes. reason for falling due to absence adequate structural details beam-column joints, which were typically relying on friction located regions previously classified as non-seismic prone. To guarantee safety whole existing building stock, this collapse mechanism must be ...

In this paper we derive a new dynamic friction force model for the longitudinal road/tire interaction for wheeled ground vehicles. The model is based on a dynamic friction model developed previously for contact-point friction problems, called the LuGre model [7]. By assuming a contact patch between the tire and the ground we develop a partial differential equation for the distribution of the fr...

In tribological applications, because of the corrosive problems of the metals in water applications, poly-ether-ether-ketone (PEEK) and its composites are preferred for rubbing materials. As it is known PEEK is a high performance semi-crystalline thermoplastic polymer and has received significant attention in recent years. This is due to its high mechanical strength and elastic modulus, high to...