13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- Fig. 2: Split Hopkinson Tensile Bar dimensions and corresponding lagrange diagram. A significant increase of stress level is observed with impact strain rate, as shown in Figure 3. Figure 3 Stress strain curves at intermediate strain rates 2.2. Shear tests Double shearing test can be realized which might prevent from geometrical instabilities. Divers versions of this test had been developed in the past decades [27-29]. A modified double shearing device to better fit with the 60mm-diameter Split Hopkinson pressure bar was developed by Merle [30]. Figure 4 shows the clamping device and specimen for the shearing tests. The specimen has two symmetric shearing zones of 3mm width and 20mm length. The clamping device is composed of the two moving coaxial pieces.
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