Abstract
An experimental method that frequently has been used for the determination of material hardening parameters is the three-point bending test. The advantage of this test is that it is simple to perform, and standard test equipments can be used. The disadvantage is that the material parameters have to be determined by some kind of inverse approach. The test has then been simulated by means of the Finite Element Method, and the material parameters have been determined by finding a best fit to the experimental results by means of a Response Surface Methodology. An alternative method is the tensile/compression test of a sheet strip. In practice such a test is very difficult to perform, due to the tendency of the strip to buckle in compression. In spite of these difficulties some successful attempts to perform cyclic tension/compression tests have been reported in the literature. However, a few writers have reported that there are substantial differences between hardening parameters determined from bending tests and those determined from tensile/compression tests. The purpose of the present study is to try to understand the background of these differences, to find out the influence on predicted springback, and to determine which of the two methodologies for hardening parameter identification is the most suitable one.
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References
Eggertsen PA, Mattiasson M (2009) On the modelling of the bending-unbending behavior for accurate springback predictions. Int J Mech Sci 51:547–563
Eggertsen PA, Mattiasson M (2010) An efficient inverse approach for material hardening parameter identification from a three-point bending test. Eng Comput 26:159–170
Eggersten PA (2009) Prediction of springback in sheet metal forming, with emphasis on material modelling. Licentiate thesis, Chalmers University of Technology
Eggertsen PA, Mattiasson M (2010) On constitutive modeling for springback analysis. Int J Mech Sci 52:804–818
Yoshida F, Uemori T, Fujiwara K (2002) Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain. Int J Plast 18:633–659
Lee MG, Kim D, Kim C, Wenner ML, Wagoner RH, Chung K (2005) Spring-back evaluation of automotive sheets based on isotropic-kinematic hardening laws and non-quadratic anisotropic yield functions. Part II: characterization of material properties. Int J Plast 21:883–914
Balakrishnan V (1999) Measurements of in-plane Bauschinger effect in metal sheets. Master’s thesis, The Ohio state university
Kuwabara T (2007) Advances in experiments on metal sheets and tubes in support of constitutive modeling and forming simulations. Int J Plast 23:385–419
Zhao KM, Lee JK (2001) Generation of cyclic stress-strain curves for sheet metals. J Eng Mater Technol 123:291–397
Omerspahic E, Mattiasson K, Enqvist B (2006) Identification of material hardening parameters by the three-point bending of metal sheets. Int J Mech Sci 48:1525–1532
Yoshida F, Urabe M, Toropov VV (1998) Identification of material parameters in constitutive model for sheet metals from cyclic bending tests. Int J Mech Sci 40:237–249
Carbonnière J, Thuillier S, Sabourin F, Brunet M, Manach PY (2009) Comparison of the work hardening of metallic sheets in bending-unbending and simple shear. Int J Mech Sci 51:122–130
Kessler L, Gerlach J, Aydin MS. Proceedings of IDDRG (2008) Does the measurement of more material data necessarily result in higher forming simulation accuracy, Olofström. pp 441–452
Geng L, Shen Y, Wagoner RH (2002) Anisotropic hardening equations derived from reverse-bend testing. Int J Plast 18:743–767
Kessler L, Gerlach J, Aydin MS (2008) Proceedings of the German LS-Dyna user forum. Springback simulation with complex hardening material models. Bamberg
Banabic D, Aretz H, Comsa DS, Paraianu L (2005) An improved analytical description of orthotropy in metallic sheets. Int J Plast 21:493–512
Barlat F, Brem JC, Yoon JW, Chung K, Dick RE, Lege DJ, Pourboghrat F, Choi SH, Chu E (2003) Plane stress yield function for aluminum alloy sheets—Part I: theory. Int J Plast 19:1297–1319
Aretz H (2005) A non-quadratic plane stress yield function for orthotropic sheet metals. J Mater Process Technol 168:1–9
Mattiasson K, Sigvant M (2008) An evaluation of some recent yield criteria for industrial simulation of sheet forming proceses. Int J Mech Sci 50:774–787
Hodge PG (1957) A new method of analyzing stresses and strains in work hardening solids. J Appl Mech 24:482–483
Crisfield MA (1997) More plasticity and other material non-linearity-II. In: Crisfield MA (ed) Non-linear finite element analysis of solids and structures, vol 2. Wiley, Chichester, pp 158–187
Armstrong PJ, Frederick CO (1966) A mathematical representation of the multiaxial bauschinger effect. G.E.G.B. report RD/B/N 731
Geng L, Wagoner RH (2000) Springback analysis with a modified hardening model. SAE paper No. 2000-01-0768, SAE, Inc
Boger R.K (2006). Non-Monotonic strain hardening and its constitutive representation, Dissertaion, The Ohio state University
Yoshida F, Uemori T (2002) A model of large-strain cyclic plasticity describing the Baushinger effect and work hardening stagnation. Int J Plast 18:661–686
Yoshida F, Uemori T (2003) A model of large-strain cyclic plasticity and its application to springback simulation. Int J Mech Sci 45:1687–1702
LS-DYNA keyword user’s manual (2007) Volume I, Version 971, Livermore Software technology corporation (LSTC)
Ortiz M, Simo JC (1986) An analysis of a new class of integration algorithms for elastoplastic constitutive relations. Int J Numer Methods Eng 23:353–366
Prager W (1956) A new method of analysing stresses and strains in work hardening plastic solids. J Appl Mech 23:493–496
Ziegler H (1959) A modification of Prager’s hardening rule. Quart Appl Math 17:55–65
Bathe KJ, Montáns FJ (2004) On modeling mixed hardening in computational plasticity. Comput Struct 82:535–539
Chaboche JL (1986) Time-independent constitutive theories for cyclic plasticity. Int J Plast 2:149–188
Chaboche JL (1989) Constitutive equations for cyclic plasticity and cyclic viscoplasticity. Int J Plast 5:247–302
Mróz Z (1967) On the description of anisotropic work hardening. J Mech Phys Solids 15:163–175
Dafalias YF, Popov EP (1976) Plastic internal variables formalism of cyclic plasticity. J Appl Mech 98:645
Yoshida F, Uemori T, Fujiwara K (2002) Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain. Int J Plast 18:633–659
Sigvant M, Mattiassson K, Vegter H, Thilderkvist P (2009) A viscous pressure bulge test for the determination of a plastic hardening curve and equibiaxial material data. Int J Mater Form 4:235–242
Zhao KM, Lee JK (2002) Finite element analysis of the three-point bending of sheet metals. J Mater Process Technol 122:6–11
Stander N, Roux W, Eggleston T, Craig K (2007) LS-OPT user’s manual, Version 3.2. Livermore Software technology corporation (LSTC)
Mattiasson K, Strange A, Thilderkvist P, Samuelsson A (1995) Simulation of springback in sheet metal forming. In: Simulation of materials processing: theory, methods and applications 115-24
Logan RW, Hosford WF (1980) Upper-bound anisotropic yield locus calculations assuming (111)-pencil glide. Int J Mech Sci 27:419–430
Acknowledgements
The characterization of the materials used in this study was conducted by Per Thilderkvist and Jörgen Hertzman at the Industrial Development Center in Olofström, Sweden. The three-point bending tests were performed by Bertil Enquist at Växjö University. Their contribution to this work is gratefully acknowledged.
Financial support has been provided by Vinnova through the FFI research program (Strategic Vehicle Research and Innovation).
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Eggertsen, PA., Mattiasson, K. On the identification of kinematic hardening material parameters for accurate springback predictions. Int J Mater Form 4, 103–120 (2011). https://doi.org/10.1007/s12289-010-1014-7
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DOI: https://doi.org/10.1007/s12289-010-1014-7