Eight different models to represent the effect of friction in control valves are presented: four models based on physical principles and four empirical ones. The physical models, both static and dynamic, have the same ...

The experimental flow stress curves of structural steels obtained from axisymmetric compression tests conducted under hot-working conditions very often include the frictional effects present at the tool/specimen interface. ...

The micro-scale abrasive wear test by rotative ball has gained large acceptance in universities and research centers, being widely used in studies on the abrasive wear of materials. Two wear modes are usually observed in ...

The present work analyzes the friction capabilities at room temperature of three types of lubricants (denoted as A, B and C) with a graphite concentration of 5%. To do that, the standard pin -on disc test is deployed to ...

Due to the high pressures that are involved in tube hydroforming processes, high values of the friction forces are developed and, therefore, lubricants are usually employed to increase the formability of the workpiece. ...

One possibility to intervene in falls due to slipping is to use shoes with soles that can resist possible slips. The objective of this research is to evaluate the friction coefficient of the female footwear for the elderly ...

Objective: To evaluate stainless steel archwire static friction in active and passive self-ligating lingual and conventional brackets with secondorder angulations. Methods: Two conventional lingual brackets for canines ...