Role of plastic anisotropy and its evolution on springback

Geng, Lumin; Wagoner, R. H.

doi:10.1016/s0020-7403(01)00085-6

Cited by 193 publications

(68 citation statements)

References 98 publications

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“…However, it is unable to describe permanent softening and work-hardening stagnation. By introducing an additional bounding yield surface, Geng and Wagoner (2002) presented a model able to predict permanent softening. Work-hardening stagnation is a phenomenon mostly found in mild steel and models to address this effect have been presented by e.g.…”

Section: Isotropic Hardeningmentioning

confidence: 99%

Ductile Failure in High Strength Steel Sheets

Björklund¹

2014

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Cover:Results form finite element simulation of the stretching of the sheet metal exhaust bracket.Printed by: LiU-Tryck, Linköping, Sweden, 2014 ISBN 978-91-7519-389-2 ISSN 0345-7524 Distributed by: Linköping University Department of Management and Engineering 581 83 Linköping, Sweden c 2014 Oscar Björklund This document was prepared with L A T E X, March 7, 2014 No part of this publication may be reproduced, stored in a retrieval system, or be transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior permission of the author. PrefaceThe work presented in this thesis has been carried out at the Division of Solid Mechanics at Linköping University with financial support from the VINNOVA PFF project "Fail" and the SFS ProViking project "Super Light Steel Structures". Industrial partners DYNAmore Nordic, Outokumpu Stainless, Saab Automobile, Scania CV, SSAB, Swerea IVF and Volvo Car Corporation are gratefully acknowledged for their support. AbstractDevelopments in computer-aided engineering and the rapid growth of computational power have made simulation-driven process and product development efficient and useful since it enables detailed evaluation of product designs and their manufacturing processes. In the context of a sheet metal component, it is vital to predict possible failure both during its forming process and its subsequent usage. Accurate numerical models are needed in order to obtain trustworthy simulation results. Furthermore, the increasing demands imposed on improved weightto-performance ratio for many products endorse the use of high-strength steels. These steels often show anisotropic behaviour and more complex hardening and fracturing compared to conventional steels. Consequently, demand for research on material and failure models suitable for these steels has increased.In this work, the mechanical and fracture behaviour of two high-strength steels, Docol 600DP and Docol 1200M, have been studied under various deformation processes. Experimental results have been used both for material characterisation and for calibration of fracture criteria. One major requirement as concerns the fracture criteria studied is that they should be simple to apply in industrial applications, i.e. it should be possible to easily calibrate the fracture criteria in simple mechanical experiments and they should be efficient and accurate. Consequently, un-coupled phenomenological damage models have been the main focus throughout this work.Detailed finite element models including accurate constitutive laws have be used to predict and capture material instabilities. Most of the fracture criteria studied are modifications of the plastic work to fracture. Ductile tensile and ductile shear types of fracture are of particular interest in sheet metal applications. For these fractures the modification of the plastic work relates to void coalescence and void collapse, respectively. Anisotropy in fracture behaviour can be captured by the introduction of a material ...

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Section: Isotropic Hardeningmentioning

confidence: 99%

Ductile Failure in High Strength Steel Sheets

Björklund¹

2014

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“…The rate of reduction in springback angle increases with increasing material strength. The springback angle at high back forces is controlled by anticlastic curvature [9]. Higher back forces accentuate anticlastic curvature, which in turn increases the moment of inertia of the specimen cross section, thus reducing springback.…”

Section: Draw Bend Test Procedures and Parametersmentioning

confidence: 99%

Influence of draw restraining force on the springback in advanced high strength steels

et al. 2008

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“…However, the high strength achieved by high strain hardening in UHSSs often results in a greater tendency for springback when applied in manufacturing vehicle components for the automotive industry using stamping technologies [7]. For accurate springback prediction, several material models are modified based on material properties, such as the Bauschinger effect [8], transient behavior [9], nonlinear elastic behavior [10], and modulus change behavior [11]. Based on the material properties, Eggertsen and Mattiasson [12] modified the yield functions and the hardening laws and concluded that the yield functions and the hardening laws have a greater impact on the predicted springback.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Strain Heterogeneity and Transformation of Metastable Austenite on Springback Behavior in Quenching and Partitioning Steel

Liu

et al. 2018

Metals

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Multiple strengthening methods, such as high dislocation density, high twin density, small grain size, and metastable austenite phase can give high strength to ultra-high strength steels (UHSSs). However, the high strength of UHSSs often results in a greater tendency for springback when applied in manufacturing vehicle components. In the present study, two types of UHSSs, dual-phase (DP) steel and quenching and partitioning (QP) steel are investigated to study the springback behavior during the bending process. Results indicated that both the strain heterogeneity and the transformation of retained austenite impacted the springback behavior. The springback angle of the DP steel increased with the increase in bending angle, which was caused by the increasing degree of strain heterogeneity. However, the springback angle of the QP steel decreased to a 14.75 • when QP specimens were strained at a 104 • bending angle due to the inhibiting effect of the phase transformation. This indicated that there was preferential phase transformation in the thickness direction in the retained austenite of the outer and inner zones. The phase transformation caused low strain heterogeneity, which resulted in a lower tendency for springback. The results suggested that QP steel could possess lower springback at a proper bending angle.

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Role of plastic anisotropy and its evolution on springback

Cited by 193 publications

References 98 publications

Ductile Failure in High Strength Steel Sheets

Ductile Failure in High Strength Steel Sheets

Influence of draw restraining force on the springback in advanced high strength steels

The Impact of Strain Heterogeneity and Transformation of Metastable Austenite on Springback Behavior in Quenching and Partitioning Steel

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