Influence of forging pressure and welding time on microstructure and mechanical properties of dissimilar metal friction welding joints between AISI-316 austenitic stainless steel and AISI-4140 alloy steel under high speed rotation

2021 ◽  
Author(s):  
Haikal ◽  
Bambang Margono ◽  
Moch. Chamim ◽  
Apri Wiyono ◽  
Isnarno
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Welding Time ◽  
Dissimilar Metal ◽  
Aisi 4140 ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Welding Joints ◽  
Aisi 316 ◽  
Metal Friction

Rolled Tubular Scaffolds with Aligned Nanofibers and their Mechanical Properties

2013 ◽  
Vol 821-822 ◽  
pp. 1326-1329
Author(s):  
Gui Bo Yin
Keyword(s):  
Mechanical Properties ◽  
High Speed ◽  
Poly Lactic Acid ◽  
Fiber Direction ◽  
Construction Technology ◽  
Electrospinning Technique ◽  
Tubular Scaffold ◽  
High Speed Rotation ◽  
Rolling Method ◽  
Speed Rotation

In this paper, a novel tubular scaffold was constructed by electrospinning technique and rolling method. Firstly, a high speed rotation drum was used to collect aligned poly (lactic acid) (PLA) nanofibers. Secondly, the membrane was cut and rolled into tube. Finally, a randomly oriented nanofibers layer was electrospun onto the rolled tube to envelope the end of rolled membrane and increase the mechanical properties. The morphology and alignment of nanofibers was observed and the mechanical properties were evaluated. The results showed that desirable alignment could be obtained by adjusting rotation speed. Along the fiber direction, the tensile stress of aligned PLA nanofibers membrane reached 49.32 ± 14.83 MPa and the elongation was17.71% ± 0.06%. The suture strength was more than adequate for suturing during implantation (2.36 ± 0.80 N/needle). This results derived from this study indicated that the construction technology was feasible and fundamentally verified the applicability of novelly designed scaffolds in tissue engineering.

scholarly journals Sound Noise Generated from Ball Bearing in High Speed Rotation

1978 ◽  
Vol 21 (158) ◽  
pp. 1306-1310 ◽  
Author(s):  
Akio NAGAMATSU ◽  
Masaho FUKUDA
Keyword(s):  
High Speed ◽  
Ball Bearing ◽  
High Speed Rotation ◽  
Speed Rotation

Analysis of the Lubrication Regimes at the Small End and Big End of a Connecting Rod of a High Performance Motorbike Engine

2012 ◽  
Author(s):  
Luca Bertocchi ◽  
Matteo Giacopini ◽  
Daniele Dini
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
High Performance ◽  
Hydrodynamic Lubrication ◽  
Vertical Axis ◽  
Connecting Rod ◽  
Lubrication Regimes ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Squeeze Effect

In the present paper, the algorithm proposed by Giacopini et. al. [1], based on a mass-conserving formulation of the Reynolds equation using the concept of complementarity is suitably extended to include the effects of compressibility, piezoviscosity and shear-thinning on the lubricant properties. This improved algorithm is employed to analyse the performance of the lubricated small end and big end bearings of a connecting rod of a high performance motorbike engine. The application of the algorithm proposed to both the small end and the big end of a con-rod is challenging because of the different causes that sustain the hydrodynamic lubrication in the two cases. In the con-rod big end, the fluid film is mainly generated by the relative high speed rotation between the rod and the crankshaft. The relative speed between the two races forms a wedge of fluid that assures appropriate lubrication and avoids undesired direct contacts. On the contrary, at the con-rod small end the relative rotational speed is low and a complete rotation between the mating surfaces does not occurs since the con-rod only oscillates around its vertical axis. Thus, at every revolution of the crankshaft, there are two different moments in which the relative rotational speed between the con-rod and the piston pin is null. Therefore, the dominant effect in the lubrication is the squeeze caused by the high loads transmitted through the piston pin. In particular both combustion forces and inertial forces contribute to the squeeze effect. This work shows how the formulation developed by the authors is capable of predicting the performance of journal bearings in the unsteady regime, where cavitation and reformation occur several times. Moreover, the effects of the pressure and the shear rate on the density and on the viscosity of the lubricant are taken into account.

Research on Calibration Method of Tire Dynamic Balance Detection System

2012 ◽  
Vol 542-543 ◽  
pp. 828-832 ◽  
Author(s):  
Jing Fang Yang ◽  
Xian Ying Feng ◽  
Hong Jun Fu ◽  
Lian Fang Zhao
Keyword(s):  
High Speed ◽  
Detection System ◽  
Dynamic Balance ◽  
Calibration Method ◽  
Engineering Practice ◽  
Influence Coefficient ◽  
Quality Factors ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Upper Rim

Tire dynamic balance detection plays an important part in tire quality detection area. This paper uses the two-sided balance method to obtain the unbalance of the tire. According to the engineering practice, builds kinetic model and then introduces the calculating principle and operating procedures. In order to accurately determine the influence coefficient, a calibration method without tire is put forward. Further more, this new method is able to eliminate the unbalance caused by non-quality factors to some extent. But this method is presented based on the relative position invariance of the upper rim and lower rim, even both of them are under high-speed rotation situation. Finally, the experimental data acquired from both of the two methods are compared. The calibration method without tire is proved to be more feasible, efficient and accurate.

Improvement of Silver Recovery Efficiency by High-Speed Rotation

2003 ◽  
Vol 439 ◽  
pp. 156-162
Author(s):  
A. Da Camara ◽  
Joaquín Lira-Olivares ◽  
Soo Wohn Lee ◽  
H.D. Park ◽  
Y.S. Park
Keyword(s):  
High Speed ◽  
Recovery Efficiency ◽  
Silver Recovery ◽  
High Speed Rotation ◽  
Speed Rotation

High-speed Rotation and Speed Stability of the Sodium-driven Flagellar Motor inVibrio alginolyticus

1995 ◽  
Vol 251 (1) ◽  
pp. 50-58 ◽  
Author(s):  
Kazumasa Muramoto ◽  
Ikuro Kawagishi ◽  
Seishi Kudo ◽  
Yukio Magariyama ◽  
Yasuo Imae ◽  
...  
Keyword(s):  
High Speed ◽  
Flagellar Motor ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Speed Stability
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