4. Results and analysis 4.1 The maximum principal stress failure criterion Refering to quasi static tensile tests, the maximum principal stress of Q235 was 560MPa，The maximum shear stress of Q235 was 448MPa. With the simulation computation, failure mode of the maximum principal stress for different velocity is showing in Fig.5 and 6. After impacting on the rigid wall, the Taylor bar was smashed. The fragments were very small and almost in the same volume (v=400m/s). Fig.5 Failure mode of the maximum principal stress Fig.6 Failure mode of the maximum principal stress (v=300m/s) (v=400m/s) 4.2 The equivalent plastic strain failure criterion Refering to quasi static tensile tests, the equivalent plastic strain, 0 2ln f d d ε ⎛ ⎞ = ⎜ ⎟ ⎝ ⎠ , for Q235 1 fε = . Through the simulation, failure mode of equivalent plastic strain for different velocities (v=300m/s, 400m/s) are showing in Fig.7and 8.
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