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The second Sandia Fracture Challenge : predictions of ductile failure under quasi-static and moderate-rate dynamic loading

B.L. Boyce 1 S.L.B. Kramer 1 T.R. Bosiljevac 1 E. Corona 1 J.A. Moore 2 K. Elkhodary 3 C.H.M. Simha 4 B.W. Williams 4 A.R. Cerrone 5 A. Nonn 6 J.D. Hochhalter 7 G.F. Bomarito 7 J.E. Warner 7 B.J. Carter 8 D.H. Warner 8 A.R. Ingraffea 8 Tiantian Zhang 9 X. Fang 9 J. Lua 9 Vincent Chiaruttini 10 Matthieu Mazière 11 Sylvia Feld-Payet 10 Vladislav Yastrebov 11 Jacques Besson 11 Jean Louis Chaboche 10 J. Lian 12 Y. Di 12 B. Wu 12 D. Novokshanov 12 N. Vajragupta 12 P. Kucharczyk 12 V. Brinnel 12 B. Dobereiner 12 S Munstermann 12 M.K. Neilsen 1 K. Dion 13 K.N. Karlson 13 J.W. Foulk 13 A.A. Brown 13 M.G. Veilleux 13 J.L Bignell 1 S.E. Sanborn 1 C.A. Jones 1 P.D. Mattie 1 K. Pack 14 T. Wierzbicki 14 S.W. Chi 15 S.P. Lin 15 A. Mahdavi 15 J. Predan 16, 15 J. Zadravec 16 A.J. Gross 17 K. Ravi-Chandar 17 L. Xue 18 
Abstract : Ductile failure of structural metals is relevant to a wide range of engineering scenarios. Computational methods are employed to anticipate the critical conditions of failure, yet they sometimes provide inaccurate and misleading predictions. Challenge scenarios , such as the one presented in the current work, provide an opportunity to assess the blind, quantitative predictive ability of simulation methods against a previously unseen failure problem. Rather than evaluate the predictions of a single simulation approach, the Sandia Fracture Challenge relies on numerous volunteer teams with expertise in computational mechanics to apply a broad range of computational methods, numerical algorithms, and constitutive models to the challenge. This exercise is intended to evaluate the state of health of technologies available for failure prediction. In the first Sandia Fracture Challenge, a wide range of issues were raised in ductile failure modeling, including a lack of consistency in failure models, the importance of shear calibration data, and difficulties in quantifying the uncertainty of prediction [see Boyce et al. (Int J Fract 186:5–68, 2014) for details of these observations]. This second Sandia Fracture Challenge investigated the ductile rupture of a Ti–6Al–4V sheet under both quasi-static and modest-rate dynamic loading (failure in ∼0.1 s). Like the previous challenge, the sheet had an unusual arrangement of notches and holes that added geometric complexity and fostered a competition between tensile-and shear-dominated failure modes. The teams were asked to predict the fracture path and quantitative far-field failure metrics such as the peak force and displacement to cause crack initiation. Fourteen teams contributed blind predictions, and the experimental outcomes were quantified in three independent test labs. Additional shortcomings were revealed in this second challenge such as inconsistency in the application of appropriate boundary conditions, need for a thermomechanical treatment of the heat generation in the dynamic loading condition, and further difficulties in model calibration based on limited real-world engineering data. As with the prior challenge, this work not only documents the 'state-of-the-art' in computational failure prediction of ductile tearing scenarios , but also provides a detailed dataset for non-blind assessment of alternative methods.
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Submitted on : Monday, April 25, 2016 - 3:31:23 PM
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B.L. Boyce, S.L.B. Kramer, T.R. Bosiljevac, E. Corona, J.A. Moore, et al.. The second Sandia Fracture Challenge : predictions of ductile failure under quasi-static and moderate-rate dynamic loading. International Journal of Fracture, Springer Verlag, 2016, 198, pp.5-100. ⟨10.1007/s10704-016-0089-7⟩. ⟨hal-01305640⟩



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