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The strain fields present during the bending of ultra-high strength steels

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Hazra, S. K. , Efthymiadis, Panagiotis, Proprentner, Daniela, Shollock, Barbara A. and Dashwood, Richard (2017) The strain fields present during the bending of ultra-high strength steels. In: International Conference on the Technology of Plasticity, ICTP 2017, Cambridge, 17-22 Sept 2017. Published in: Procedia Engineering, 207 pp. 1314-1319. ISSN 1877-7058.

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Official URL: https://doi.org/10.1016/j.proeng.2017.10.889

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Abstract

Ultra high strength steels (UHSS) have an ultimate tensile strength of greater than 1GPa. Typically, their ambient temperature elongation is less than 10% and as a result, they are rarely used in stamping applications. However, the continuous demand for the weight reduction of structures built for the transport sector means that such materials are attractive because they can be used for parts with thinner cross-sections while maintaining required in-service performance. One way to overcome the ambient temperature ductility of these materials is to roll-form them, particularly with emerging flexible roll forming technology. Using numerically-controlled actuators, the rolls on each stand are designed with sufficient degrees of freedom to form parts that curve, vary in depth and width along their lengths. This makes flexibly roll-formed parts attractive to the transport, particularly the automotive, sector. Roll forming deforms a material through incremental, localised bending, which is known to suppress the necking response, resulting in deformations that are higher than in stretch deformation. Recent work, such as Le Maoût, Thuillier & Manach, Eng. Frac. Mech., Vol. 76, p.1202 (2009), focussed on the development of ductile fracture models to explain failure but their validation was limited to load displacement and surface strain data. This work aims to characterise the strain field during bending more comprehensively. Using the digital image correlation technique, the macroscopic strain distribution in UHSS in the thickness of the sheet and the strain partitioning in its microstructure is measured during bending. The data provides a detailed explanation of the strain distribution during bending.

Item Type: Conference Item (Paper)
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Steel, High strength, Roll forming (Metalwork)
Journal or Publication Title: Procedia Engineering
Publisher: Elsevier
ISSN: 1877-7058
Official Date: 15 November 2017
Dates:
DateEvent
15 November 2017Available
9 May 2017Accepted
Volume: 207
Page Range: pp. 1314-1319
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/M014096/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
Conference Paper Type: Paper
Title of Event: International Conference on the Technology of Plasticity, ICTP 2017
Type of Event: Conference
Location of Event: Cambridge
Date(s) of Event: 17-22 Sept 2017
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Open Access Version:
  • https://doi.org/10.1016/j.proeng.2017.10...

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