A Novel Grip Design for High-Accuracy Thermo-Mechanical Tensile Testing of Boron Steel under Hot Stamping Conditions

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Title: A Novel Grip Design for High-Accuracy Thermo-Mechanical Tensile Testing of Boron Steel under Hot Stamping Conditions
Author(s): Ganapathy, M
Li, N
Lin, J
Abspoel, M
Bhattacharjee, D
Item Type: Journal Article
Abstract: Achieving uniform temperature within the effective gauge length in thermo-mechanical testing is crucial for obtaining accurate material data under hot stamping conditions. A new grip design for the Gleeble Materials-Simulator has been developed to reduce the long-standing problem of temperature gradient along a test-piece during thermo-mechanical tensile testing. The grip design process comprised two parts. For the first part, the new design concept was analysed with the help of Abaqus coupled Thermal-Electric Finite element simulation through the user defined feedback control subroutine. The second part was Gleeble thermo-mechanical experiments using a dog-bone test-piece with both new and conventional grips. The temperature and strain distributions of the new design were compared with those obtained using the conventional system within the effective gauge length of 40 mm. Temperature difference from centre to edge of effective gauge length (temperature gradient) was reduced by 56% during soaking and reduced by 100% at 700 °C. Consequently, the strain gradient also reduced by 95%, and thus facilitated homogeneous deformation. Finally to correlate the design parameters of the electrical conductor used in the new grip design with the geometry and material of test-piece, an analytical relationship has been derived between the test-piece and electrical conductor.
Publication Date: 4-Oct-2017
Date of Acceptance: 21-Aug-2017
URI: http://hdl.handle.net/10044/1/54090
DOI: https://dx.doi.org/10.1007/s11340-017-0333-8
ISSN: 0014-4851
Publisher: Springer Verlag
Start Page: 243
End Page: 258
Journal / Book Title: Experimental Mechanics
Volume: 58
Issue: 2
Copyright Statement: ©The Author(s) 2017. This article is an open access publication
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: NMP3-SE-2013-604240
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Mechanics
Materials Science, Characterization & Testing
Materials Science
Grip design
Thermo-mechanical testing
Temperature fields
Boron steel
Hot stamping
Electrical-resistance heating
UNIFIED CONSTITUTIVE-EQUATIONS
MICROSTRUCTURE EVOLUTION
SIMULATOR
BEHAVIOR
MODEL
0905 Civil Engineering
0913 Mechanical Engineering
0915 Interdisciplinary Engineering
Mechanical Engineering & Transports
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Dyson School of Design Engineering



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