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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12890
Title: Material flow visualization and determination of strain rate during friction stir welding
Authors: Kumar R.
Pancholi V.
Bharti R.P.
Published in: Journal of Materials Processing Technology
Abstract: Particle image velocimetry (PIV) technique was adopted to understand material flow and measure strain rate around the tool pin during friction stir welding (FSW). The micro-spherical glass tracers in a transparent visco-plastic material, of almost similar densities, were used as experimental materials. The characteristics of material flow, in particular, flow velocity and strain rate were obtained by following the path of the tracer particles. A rotational zone around the tool pin was observed due to large deformation of the material close to the tool pin. The maximum velocity was noted to be 60% (close to the pin surface) of the pin peripheral velocity, and strain-rate was found to be 20 s−1 (0.6 mm away from the pin periphery) at FSW parameters of 170 rpm and 50 mm min−1. The strain rate was found to increase from 8 s−1 to 44 s−1 with increase in rotational speed from 75 rpm to 425 rpm. Predictive correlations were established for variations of velocity and maximum strain-rate as a function of rotational, traverse speeds and distance away from the tool pin surface. Overall, it was established that PIV technique can be utilized for the understanding of material flow and strain-rate behaviour during FSW. Furthermore, this technique enabled in-situ visualization overcoming drawbacks of other techniques reported in the literature. © 2018 Elsevier B.V.
Citation: Journal of Materials Processing Technology (2018), 255(): 470-476
URI: https://doi.org/10.1016/j.jmatprotec.2017.12.034
http://repository.iitr.ac.in/handle/123456789/12890
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: FSW/P
Material flow velocity
PIV system
Strain rate
Visco-plastic material
ISSN: 9240136
Author Scopus IDs: 57211197963
14071738800
14521775900
Author Affiliations: Kumar, R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
Pancholi, V., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
Bharti, R.P., Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
Corresponding Author: Pancholi, V.; Department of Metallurgical and Materials Engineering, Indian Institute of TechnologyIndia; email: vivekfmt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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