In order to capture the inception and development of strain localization of specimen during dynamic loading, high-speed photography is used. A full-field measuring system based on digital image correlation is successfully applied to track the displacement and strain field from initial plasticity to fracture, and thus provided some substantial information concerning the localisation and hence the inception of ductile failure. By using these techniques, the local fracture strain of material, the important parameter which often be used in numerical simulation, could be obtained. Acknowledgements This work was financially supported by the Natural Science Foundation of China (Grant Nos. 11172328, 11202232 and 11132012), and the foundation of National University of Defense Technology (Grant No. JC-11-02-17). References 1. Khan AS, Baig M, Choi SH, Yang HS, Sun X (2012) Quasi-static and dynamic responses of advanced high strength steels: experiments and modeling. Int J Plast 30–31:1–17 2. Van Slycken J, Verleysen P, Degrieck J, Bouquerel J, De Cooman BC (2007) The effect of silicon, aluminium and phosphor on the dynamic behavior and phenomenological modelling of multiphase TRIP steels. Met Mater Int 13(2):93–101 3. Curtze S, Kuokkala VT, Hokka M, Peura P (2009) Deformation behavior of TRIP and DP steels in tension at different temperatures over a wide range of strain rates. Mater Sci Eng A 507(1–2):124–131 4. Huh H, Kim SB, Song JH, Lim JH (2008) Dynamic tensile characteristics of TRIP-type and DP-type steel sheets for an auto-body. Int J Mech Sci 50(5):918–931 5. Winkler S, Thompson A, Salisbury C, Worswick M, Van Riemsdijk I, Mayer R (2008) Strain rate and temperature effects on the formability and damage of advanced high-strength steels. Metall Mater Trans A 39(6):1350–1358 6. Tang W, Shi YW (1995) Influence of strength matching and crack depth on fracture toughness of welded joints. Eng Fract Mech 51(4):649–659 7. Lee DG, Jang KC, Kuk JM, Kim IS (2004) Fatigue properties of inertia dissimilar friction-welded stainless steels. J Mater Process Technol 155-156:1402–1407 8. Kolsky H (1949) An investigation of the mechanical properties of materials at very high rates of loading. Proc Phys Soc B 62:676–700 9. Sutton M, McNeill S, Helm J, Chao Y (2000) Advances in two-dimensional and three-dimensional computer vision. Photomechanics 77:323–372 10. Hung PC, Voloshin A (2003) In-plane strain measurement by digital image correlation. J Braz Soc Mech Sci Eng 25(3):215–221 11. Van Slycken J, Verleysen P, Degrieck J, Samek L, De Cooman B (2006) High-strain-rate behavior of low-alloy multiphase aluminum-and silicon-based transformation-induced plasticity steels. Metall Mater Trans A 37(5):1527–1539 496 J.G. Qin et al.
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