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Experimental Mechanics

, Volume 59, Issue 1, pp 51–63 | Cite as

Experimental Method for Multistage Loading Tests with Various Prestrain Paths

  • L. H. Zheng
  • Z. J. WangEmail author
  • H. Song
Article
  • 168 Downloads

Abstract

Two-stage loading tests with various prestrain paths between simple shear and equibiaxial tension are essential for understanding multistage sheet metal forming processes. Yet, as to each existing experimental method, two-stage loading tests can only be realized with one type of prestrain path. Worse still, two-stage loading tests with various pre-deformation paths between simple shear and uniaxial tension are unachievable through current experimental methods. In this paper, an experimental method with controllable prestrain paths is proposed to resolve these problems. The principle of the experimental method for achieving two-stage loading tests with various prestrain paths is first given. Then a tension and shear biaxial loading method is established and specimens suitable for the two-stage loading tests are determined through the finite element analyses of the strain field uniformity, accuracy of the calculated plastic work per unit volume and strain paths of specimens under different loading conditions. Subsequently, experiments on 6K21-T4 aluminum sheet are performed to validate the feasibility and capability of the proposed method. It is found that the mechanical properties and behavior of the material subjected to non-linear strain paths with different prestrain paths between simple shear and plane strain tension can be obtained by changing the loading conditions acting on the boundaries of the new flat specimen. Therefore, the proposed experimental method can be used for multistage loading tests of sheet metals with various prestrain paths, especially with different prestrain paths between simple shear and uniaxial tension, which solves the problems mentioned above.

Keywords

Multistage loading Strain paths Mechanical properties and behavior Biaxial tension and shear Prestrain 

Notes

Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (No. 51275130). The authors would like to take this opportunity to express their sincere appreciation to the funding.

References

  1. 1.
    Kuwabara T (2007) Advances in experiments on metal sheets and tubes in support of constitutive modeling and forming simulations. Int J Plast 23:385–419CrossRefzbMATHGoogle Scholar
  2. 2.
    Manik T, Holmedal B, Hopperstad OS (2015) Strain-path change induced transients in flow stress, work hardening and r-values in aluminum. Int J Plast 69:1–20CrossRefGoogle Scholar
  3. 3.
    Khan AS, Pandey A, Stoughton T (2010) Evolution of subsequent yield surfaces and elastic constants with finite plastic deformation. Part II: a very high work hardening aluminum alloy (annealed 1100 Al). Int J Plast 26:1421–1431CrossRefzbMATHGoogle Scholar
  4. 4.
    Sun L, Wagoner RH (2013) Proportional and non-proportional hardening behavior of dual-phase steels. Int J Plast 45:174–187CrossRefGoogle Scholar
  5. 5.
    Riel MV, Boogaard AHVD (2007) Stress-strain responses for continuous orthogonal strain path changes with increasing sharpness. Scr Mater 57:381–384CrossRefGoogle Scholar
  6. 6.
    Barlat F, Ferreira DJM, Gracio JJ, Lopes AB, Rauch EF (2003) Plastic flow for non-monotonic loading conditions of an aluminum alloy sheet sample. Int J Plast 19:1215–1244CrossRefzbMATHGoogle Scholar
  7. 7.
    Gérard C, Cailletaud G, Bacroix B (2013) Modeling of latent hardening produced by complex loading paths in FCC alloys. Int J Plast 42:194–212CrossRefGoogle Scholar
  8. 8.
    Tarigpula V, Hopperstad OS, Langseth M, Clausen AH (2008) Elastic-plastic behaviour of dual-phase, high-strength steel under strain-path changes. European Journal of Mechanics - A/Solids 27:764–782Google Scholar
  9. 9.
    Ha J, Lee MG, Barlat F (2013) Strain hardening response and modeling of EDDQ and DP780 steel sheet under non-linear strain path. Mech Mater 64:11–26CrossRefGoogle Scholar
  10. 10.
    Yu HY, Shen JY (2014) Evolution of mechanical properties for a dual-phase steel subjected to different loading paths. Mater Des 63:412–418CrossRefGoogle Scholar
  11. 11.
    Chung JH, Dong NL (1993) Effect of changes in strain path on the anisotropy of yield stresses of low-carbon steel and 70-30 brass sheets. J Mater Sci 28:4704–4712CrossRefGoogle Scholar
  12. 12.
    Laukonis JV, Ghosh AK (1978) Effects of strain path changes on the formability of sheet metals. Metall Trans A 9:1849–1856CrossRefGoogle Scholar
  13. 13.
    Li YN, Luo M, Gerlach J, Wierzbicki T (2010) Prediction of shear-induced fracture in sheet metal forming. J Mater Process Technol 210:1858–1869CrossRefGoogle Scholar
  14. 14.
    Mohr D, Oswald M (2008) A new experimental technique for the multi-axial testing of advanced high strength steel sheets. Exp Mech 48:65–77CrossRefGoogle Scholar
  15. 15.
    Mohr D, Dunand M, Kim KH (2010) Evaluation of associated and non-associated quadratic plasticity models for advanced high strength steel sheets under multi-axial loading. Int J Plast 26:939–956CrossRefzbMATHGoogle Scholar
  16. 16.
    Dunand M, Maertens AP, Luo M, Mohr D (2012) Experiments and modeling of anisotropic aluminum extrusions under multi-axial loading-part I: plasticity. Int J Plast 36:34–49CrossRefGoogle Scholar
  17. 17.
    Dunand M, Mohr D (2011) Optimized butterfly specimen for the fracture testing of sheet materials under combined normal and shear loading. Eng Fract Mech 78:2919–2934CrossRefGoogle Scholar
  18. 18.
    Wang ZX, Wu ZQ, Zhen XJ, Yang RD, Xi JT, Chen XB (2015) A two-step calibration method of a large FOV binocular stereovision sensor for onsite measurement. Measurement 62:15–24CrossRefGoogle Scholar
  19. 19.
    Walters CL (2013) The effect of machining the gage section on biaxial tension/shear plasticity experiments of DP780 sheet steel. Exp Mech 53:1647–1659CrossRefGoogle Scholar
  20. 20.
    Khan AS, Huang S (1995) Continuum theory of plasticity. Wiley, New YorkzbMATHGoogle Scholar
  21. 21.
    Wardlow J, Allameh SM (2015) On the micromechanical characterization of metallic MEMS by a hybrid Microtester. Proceedings of 2015 ASME International Mechanical Engineering Congress and Exposition, IMECE2015-50942, Nov. 13-19, Houston, TX.  https://doi.org/10.1115/IMECE2015-50942

Copyright information

© Society for Experimental Mechanics 2018

Authors and Affiliations

  1. 1.National Key Laboratory for Precision Heat Processing of Metals, School of Materials Science and EngineeringHarbin Institute of TechnologyHarbinChina

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