In this paper, the twinning-induced plasticity (TWIP) steel was tested under single-stage gas gun plate impact loading with the speed of 500 m/s in the strain rate range of 5.5 × 104 s−1–3.6 × 105 s−1 to study the effect of strain rates on spall strength and damage. The microstructures of TWIP steel after impact loading were characterized by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD) to investigate the impact response mechanisms. The impact process of TWIP steel was simulated based on finite element software ANSYS/LS-DYNA to better understand the stress change of the flyer plate on samples. Experimental results reveal that the spall strength of TWIP steel has a strong dependence on strain rates. The samples made by TWIP steels occur full spallation at different strain rates, and spall damage increases with decreasing strain rates. The failure mechanisms of TWIP steel are analyzed at different loading conditions, showing ductile voids at the grain boundaries and triple junctions dominating the fracture. Contact stress formed during impact progress propagates from the contact edge to the sample center as spherical waves. When t = 16.14 μs, the stress at the center of the sample reaches the maximum and spall damage occurs. The results obtained from finite element analogy are extremely in agreement with the experiment.
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