Advertisement

International Journal of Fracture

, Volume 186, Issue 1–2, pp 69–91 | Cite as

Prediction of ductile failure using a local strain-to-failure criterion

  • A. J. Gross
  • K. Ravi-ChandarEmail author
Original Paper

Abstract

In this article, we provide the details of the predictive simulations performed by the University of Texas team in response to the 2012 Sandia Fracture Challenge (Boyce et al. in The Sandia Fracture challenge: blind predictions of ductile tearing. Int J Fract. doi: 10.1007/10704-013-9904-6, 2013). The material constitutive model was calibrated using the tensile test data through an optimization scheme. A modified Johnson–Cook failure criterion was also partially calibrated using the material characterization data obtained from a tension test and a compact-tension fracture test. These models are then embedded in a highly refined finite element simulation to perform a blind prediction of the failure behavior of the Sandia Fracture Challenge geometry. These results are compared with experiments performed by Sandia National Laboratories and additional experiments that were performed at the University of Texas at Austin with full-field three-dimensional digital image correlation in order to explore the different failure modes. It is demonstrated that a well-calibrated model that captures the essential elastic–plastic constitutive behavior is necessary to confidently capture the elasto-plastic response of challenging structural geometries; it is also shown that a simple ductile failure model can be used to predict ductile failure correctly, when proper calibration of the material model is established.

Keywords

Localization Plasticity Simulations 

Notes

Acknowledgments

This work was performed during the course of an investigation into ductile failure under two related research programs funded by the Office of Naval Research: MURI Project N00014-06-1-0505-A00001 and FNC Project N00014-08-1-0189. This support is gratefully acknowledged.

Supplementary material

Supplementary material 1 (avi 22455 KB). Results of the SFC_blind_prediction indicating the development of PEEQ initially in the ligament A-D, subsequently in the ligament A-C, leading to failure along A-C-E.

Supplementary material 2 (avi 17701 KB). Video showing the development of equivalent plastic strain as obtained from the 3D-DIC for specimen S-09; the failure followed the path A-C-E.

Supplementary material 3 (avi 14969 KB). Video showing the development of equivalent plastic strain as obtained from the 3D-DIC for specimen S-11; the failure followed the path A-D-C-E.

10704_2013_9908_MOESM4_ESM.jpg (46.2 mb)
Figure23a High resolution image of Figure 23a, indicating development of cracks and shearing in the ligament A-D.

References

  1. Boyce BL, Kramer SLB, Fang HE et al (2013) The Sandia Fracture challenge: blind round robin predictions of ductile tearing. Int J Fract. doi: 10.1007/s10704-013-9904-6
  2. Ghahremaninezhad A, Ravi-Chandar K (2011) Ductile failure in polycrystalline OFHC copper. Int J Solids Struct 48:3299–3311CrossRefGoogle Scholar
  3. Ghahremaninezhad A, Ravi-Chandar K (2012) Ductile failure behavior of polycrystalline Al 6061–T6. Int J Fract 174:177–202CrossRefGoogle Scholar
  4. Ghahremaninezhad A, Ravi-Chandar K (2013) Ductile failure behavior of polycrystalline Al 6061-T6 under shear dominant loading. Int J Fract 180:23–39CrossRefGoogle Scholar
  5. Hill R (1948) A theory of the yielding and plastic flow of anisotropic metals. Proc R Soc Lond Ser A Math Phys Sci 193:281–297CrossRefGoogle Scholar
  6. Johnson GR, Cook WH (1985) Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Eng Fract Mech 21:31–48Google Scholar
  7. Lesuer DR, Kay GJ, LeBlanc MM (2001) Modeling large strain, high-rate deformation in metals. UCRL-JC-134118, Lawrence Livermore National LaboratoryGoogle Scholar
  8. McClintock FA (1968) A criterion for ductile fracture by the growth of holes. J Appl Mech 35:363–371CrossRefGoogle Scholar
  9. Rice JR, Tracey DM (1969) On the ductile enlargement of voids in triaxial stress fields. J Mech Phys Solids 17:201–217CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of Aerospace Engineering and Engineering Mechanics, Center for Mechanics of Solids, Structures, and MaterialsUniversity of Texas at AustinAustinUSA

Personalised recommendations