This paper proposed a semi-theoretical model to quantitatively predict leakage rate of tubing and casing premium connections. The geometric parameters the sealing surface profile approximated by sinusoidal micro-convex were first obtained based on random normal distribution sampling method. With actual area prediction formula for elastic–plastic contact an axisymmetric body equivalent simulatio...

We applied aluminum hinged shoes (AHSs) to the club foot-associated contracted feet of 11 Thoroughbred yearlings to examine the effects of the shoes on the shape of the hoof and third phalanx (P III). After 3 months of AHS use, the size of the affected hooves increased significantly, reaching the approximate size of the healthy contralateral hooves with respect to the maximum lateral width of t...

In this paper, a transient temperature calculation model for simulating grinding face gear with worm is proposed. Firstly, according to the principle of differential geometry, equations determining contact length and width instantaneous area between wheel are deduced. Based on method single abrasive particle cutting force heat, mathematical heat established, theoretical formula maximum teeth ob...

Friction is a classical field that goes back to Leonardo da Vinci, Guilliame Amonton, and Charles Augustin de Coulomb. Amonton found that friction force is proportional to normal load, but surprisingly is independent of the area of the apparent contact surface. This observation is known as the Amonton’s paradox. The apparent contact surface is the geometric object surface projected to the conta...

It has been shown experimentally that boundary friction is proportional to load (commonly known as Amontons’ law) for more than 500 years, and the fact it holds true over many scales (from microns kilometres, from nano-Newtons Mega-Newtons) materials which deform both elastically plastically subject of much research, in order fully understand its wide applicability (and also find any deviations...

Dans cet article on démontre que si une structure de contact sur variété dimension trois est portée par un livre ouvert à pages planaires, alors certaine configuration d’intersections n’apparaît dans l’homologie d’aucun ses remplissages minimaux. On plus les d’une telle ne contiennent pas surface symplectique genre positif. En appliquant ces obstructions aux structures canoniques bords des sing...

Abstract We propose a frictionless contact formulation for isogeometric analysis, which combines collocated the surfaces with standard Galerkin treatment of bulk. denote it as Collocated Contact Surface (CCS) formulation. The approach is based on simple pointwise enforcement constraints, performed in this study penalty method. Unlike (node-to-surface or point-to-surface) algorithms framework, C...

This paper deals with the scattering of a TM plane wave from a perfectly conductive sinusoidal surface with finite extent. For comparison, however, we briefly discuss the diffraction by the sinusoidal surface with infinite extent, where we use the concept of the total diffraction cross section per unit surface introduced previously. To solve a case where the sinusoidal corrugation width is much...