A fundamental investigation on rotating tool cold expansion: Numerical and experimental perspectives

Kumar, B M and Panaskar, N J and Sharma, A (2014) A fundamental investigation on rotating tool cold expansion: Numerical and experimental perspectives. International Journal of Advanced Manufacturing Technology, 73 (5-8). pp. 1189-1200. ISSN 0268-3768

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In this study, we present the development of a novel technique for cold expansion using a rotating tapered mandrel that friction processes the cylindrical wall of the fastener hole and simultaneously cold expands it. The developed technique, named as rotating tool cold expansion (RTCE), is experimentally and numerically investigated. A 3D thermomechanical finite element model for predicting the compressive residual stress, responsible for delaying crack propagation from the edges of the holes, is introduced. The efficacy is that RTCE is assessed for varying degrees of cold expansion under different lubricating conditions at the tool-workpiece interface, such as dry, metal working fluid, and nanopowder. The plastic deformation combined with friction stirring at the tool-workpiece interface helps the RTCE in controlling the surface damage at entry and exit of the hole that is most often observed with the conventional cold expansion technique. Enhanced friction due to the nanopowder at the tool-workpiece interface helps in sustaining efficacy of the RTCE even at a higher degree of cold expansion which otherwise leads to surface damage with other mediums

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Uncontrolled Keywords: Cold expansion hole; Compressive residual stresses; Degree of cold expansion; Finite element method
Subjects: ?? sub4.9 ??
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 17 Dec 2014 06:59
Last Modified: 21 Jan 2016 06:08
URI: http://raiith.iith.ac.in/id/eprint/1180
Publisher URL: http://dx.doi.org/10.1007/s00170-014-5888-2
OA policy: http://www.sherpa.ac.uk/romeo/issn/0268-3768/
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