Experimental study on laser assisted belt grinding of shark-skin bio-inspired riblets under different surface roughness

Abstract Present study investigates the roughness effect on laminar gas flow for microchannels ranging from 40 to 600 μm with various roughness heights (40–82 nm) by systematical experiments. The micro-channels are manufactured by micro-machining technology and KOH anisotropic etching is employed to achieve various roughness patterns. Experimental results shows that higher product levels of Reynolds number (Reh) and friction factor (f) are obtained for microchannels of larger size and smaller relative roughness and friction factor f approaches to laminar flow theory value f0 for very smooth channel but the ratio of (f/f0) decreases as the surface roughness increases.

Download Full-text

Effect of Tightening Speed on the Torque-Tension and Wear Pattern in Bolted Connections

Volume 2: Computer Technology ◽

10.1115/pvp2006-icpvt-11-93211 ◽

2006 ◽

Cited By ~ 2

Author(s):

Sayed A. Nassar ◽

Ramanathan M. Ranganathan ◽

Saravanan Ganeshmurthy ◽

Gary C. Barber

Keyword(s):

Experimental Data ◽

Experimental Study ◽

Surface Roughness ◽

Initial Level ◽

Zinc Coating ◽

Optical Microscope ◽

Wear Pattern ◽

Highly Sensitive ◽

Contact Surfaces ◽

Scanning Electron

This experimental study investigates the effect of tightening speed and coating on both the torque – tension relationship and wear pattern in threaded fastener applications. The fastener torque – tension relationship is highly sensitive to normal variations in the coefficients of friction between threads and between the turning head and the surface of the joint. Hence, the initial level of the joint clamp load and the overall integrity and reliability of a bolted assembly is significantly influenced by the friction coefficients. The effect of repeated tightening and loosening is also investigated using M12, Class 8.8, fasteners with and without zinc coating. The torque – tension relationship is examined in terms of the non-dimensional nut factor K. The wear pattern is examined by monitoring the changes in surface roughness using a WYKO optical profiler and by using a LECO optical microscope. A Hitachi S-3200N Scanning Electron Microscope (SEM) is used to examine the contact surfaces, under the fastener head, after each tightening/loosening cycle. Experimental data on the effect of variables and the tightening speed, fastener coating and repeated tightening on the nut factor are presented and analyzed for M8 and M12, class 8.8, fasteners.

Download Full-text

AN EXPERIMENTAL STUDY ON EFFECT OF PROCESS VARIABLES ON SURFACE ROUGHNESS, TOOL VIBRATIONS AND ELASTIC SPRING BACK IN MILLING OF AISI 316 STAINLESS STEEL

Journal of Production Engineering ◽

10.24867/jpe-2017-01-021 ◽

2017 ◽

Vol 20 (1) ◽

pp. 21-30

Author(s):

Sreenivasa Rao ◽

◽

Venkata Rao ◽

Keyword(s):

Experimental Study ◽

Surface Roughness ◽

Stainless Steel ◽

Process Variables ◽

Spring Back ◽

316 Stainless Steel ◽

Aisi 316 Stainless Steel ◽

Tool Vibrations ◽

Aisi 316 ◽

Elastic Spring

Download Full-text

Experiment and Surface Roughness Prediction Model for Ti-6Al-4V in Abrasive Belt Grinding

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1136.42 ◽

2016 ◽

Vol 1136 ◽

pp. 42-47 ◽

Cited By ~ 1

Author(s):

Ya Xiong Chen ◽

Yun Huang ◽

Gui Jian Xiao ◽

Gui Lin Chen ◽

Zhi Wu Liu ◽

...

Keyword(s):

Surface Roughness ◽

Response Surface Methodology ◽

Response Surface ◽

Great Influence ◽

Grinding Force ◽

Work Piece ◽

Belt Grinding ◽

Abrasive Belt ◽

Belt Speed ◽

Feeding Speed

In abrasive belt grinding, abrasive belt granularity, abrasive belt speed,feeding speed and grinding force have a great influence on the surface roughness. In order to predicate the surface roughness of Ti-6Al-4V,a response surface methodology are used to build the model to predict surface roughness,and the influence of various parameters on surface roughness was analysed. The research shows that with the abrasive belt granularity and abrasive belt speed increasing,the work piece surface roughness decreases;with the grinding force and feeding speed increasing,the work piece surface roughness increases. Through the test,the response surface methodology with high prediction accuracy,provides a theoretical basis for the reasonable selection of abrasive belt grinding parameters.

Download Full-text