13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Fig. 7: Strain maps for quasi-static tensile test performed at 0.01 mm/s The same image analysis can be also applied to the double shear tests. Figure 8 shows a strain map of shear tests. In contrast with tensile test, a rather homogeneous strain field was observed. Figure 8, strain field measurement during shear tests 4 Conclusions This paper used Split Hopkinson pressure bar system and high-speed testing machine to investigate the pseudoelastic deformation of a NiTi plate specimen at various strain rates. It provides original results of the strain rate dependence under not only tensile but shear loadings. In addition, the image analysis were used in all the testing which allows a measurement of strain fields. Acknowledgements Authors would like to express their thanks to the research team led by Prof. Sun Qingping of Hong Kong University of Science and Technology for his advice and supply of specimen used in all our experiments.
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