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Title of Journal: J Mech Sci Technol

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Abbravation: Journal of Mechanical Science and Technology

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Korean Society of Mechanical Engineers

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DOI

10.1007/s10439-014-1056-y

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1976-3824

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An investigation into the antireleasing performan

Authors: Jin Hwan Jeong HyunKyu Lee Keun Park JongBong Kim
Publish Date: 2015/12/12
Volume: 29, Issue: 12, Pages: 5127-5132
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Abstract

As the sizes of electric products such as mobile phones and watch phones decrease the joining bolt for the electric product should also be miniaturized However the miniaturesized bolt has to support sufficient joining torque and joining force The bolt also has to support sufficient antireleasing torque to keep the product fastened We investigated a serrated bolt as a candidate for a miniaturesized fastener to increase the antirelease torque In the serrated bolt serration shapes are formed on the bottom surface of a bolt head to create an obstacle to releasing In this study finite element analyses were carried out on joining and releasing and the antirelease torque was predicted Through the joining and releasing analyses for various values of the elastic modulus and yield strength of the joined part the effect of the mechanical properties of the joined part on the antireleasing performance were investigated The analysis results showed that a high strength insert nut is needed to increase the antireleasing torque when the yield strength of the joined part is low such as a plastic board in a mobile phoneJongBong Kim received the BS and MS in Precision Engineering from KAIST Korea Advanced Institute of Science Technology Daejon Korea in 1993 and 1995 respectively In 2000 he received his PhD in Mechanical Engineering from Taejon Korea Since September 2006 he has been with the Department of Automotive Engineering SeoulTech Seoul National University of Science Technology Seoul Korea where became an Associate Professor in 2012 His areas of interest include highstrain rate deformation behaviors of solids and structures highstrainrate constitutive equations penetration analysis of projectiles active protection systems and dynamic collision analyses

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