A novel method of characterising friction in a virtual haptic environment is described and validated in a small experimental two-finger grasp task. The algorithm adapts a common technique called the god-object method, such that the god-object is updated only when it strays outside the friction cone defined by the coefficient of friction of the object surface. The technique not only allows effic...

The most prominent feature of sheet material forming process is an elastic recovery phenomenon during unloading which leads to springback and side wall curl. Therefore evaluation of springback and side wall curl is mandatory for production of precise products. In this paper, the effects of some parameters such as friction coefficient, sheet thickness, yield strength of sheet and blank-holder fo...

Nickel-based superalloys exhibit excellent high temperature strength, corrosion and oxidation resistance creep resistance. They are widely used in applications aerospace, power petrochemical industries. The need for economical efficient usage of materials often necessitates the joining dissimilar metals. In this study, welding between two different nickel-based superalloys, Inconel 718 600, was...

Aim: To evaluate the effect of ligation method on friction and the efficacy of the new slick elastomeric modules (TP Orthodontics, USA) and slide elastomeric modules (Leone Orthodontics, Italy) which claim to reduce friction at the module/wire interface. Materials and methods: Slick and slide modules were compared with regular modules, modules tied in figure of eight fashion, tight stainless st...

We analyze the Rice-Ruina state and rate dependent friction model. The system consists of a block driven by a spring with constant velocity on a dry, rough surface. Our discussion is limited to the creep-like motion, when the driving velocity is small. Two regimes of motion are observed: stick-slip and steady sliding. The stability of the steady sliding depends on the model parameters. Numerica...

Creep age forming (CAF) is one of the novel methods in aerospace industry that has been used to manufacture components of panels with improved mechanical properties and reduced fabrication cost. CAF is a combined age-hardening and stress-relaxation that are responsible for strengthening and forming, respectively. This paper deals with the experimental investigations of mechanical and springback...