Static and dynamic mechanical behavior of 30CrMnSiNi2A steel for rocket sled slipper
30CrMnSiNi2A steel has been used as a sliding shoe material in hypersonic rocket sled tests due to its excellent plasticity,toughness and impact resistance.Obtaining a constitutive model of the 30CrMnSiNi2A steel in a wide temperature range and wide strain rate range is a necessary condition for conducting research on rocket sled cutting problems based on numerical methods.The static and dynamic mechanical properties of the 30CrMnSiNi2A steel were studied by quasi-static compression experiments and dynamic impact experiments in the temperature range of 25-800 ℃ and the strain rate range of 0.0005-10000 s-1.The effects of strain rate and temperature on the flow behavior of the 30CrMnSiNi2A steel were analyzed,and the strain rate and temperature sensitivity of the material were discussed.Furthermore,based on the experimental data of quasi-static compression and dynamic compression,a Johnson-Cook constitutive model was established that can consider the effects of strain rate and temperature.The results show that the ultimate compressive strength of the 30CrMnSiNi2A steel does not solely vary with the change of strain rate,and the influence of strain rate on the ultimate compressive strength is not significant.Whether subjected to quasi-static compression or dynamic impact,the 30CrMnSiNi2A steel exhibits strong thermal softening effect,and the temperature sensitivity coefficient increases with the increase of temperature.The Johnson-Cook constitutive model can effectively predict the true response behavior of the 30CrMnSiNi2A steel under different temperatures and strain rates.
30CrMnSiNi2A steelrocket sledmechanical propertyJohnson-Cook constitutive model
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