Dynamic mechanical behavior and constitutive model of stainless steel
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摘要: 利用带有温度调控系统的SHPB实验装置测定了0Cr17Mn5Ni4Mo3Al不锈钢在3种应变率(300、1 000、2 700 s-1)、4种环境温度（25、300、500和700 ℃）下的应力应变关系；在液压伺服材料试验机(MTS)上进行了3种温度下的准静态（0.0005 s-1）压缩实验。实验结果表明：该不锈钢有明显的应变率强化效应和温度软化效应，并且随着环境温度的升高，应变率强化效应减弱。对Johnson-Cook模型进行了修正，考虑了冲击过程中绝热温升引起的软化效应。修正后的Johnson-Cook模型与实验结果吻合较好。Abstract: Stress-strain curves of 0Cr17Mn5Ni4Mo3Al,at three Strain rates of 300,1 000,2 700 s-1 and four temperatures of 25,300,500,700 ℃ were experimentally obtained by using the split Hopkinson pressure bar equipped with a temperature controller.And the quasi-static experiment (0.000 5 s-1) was done in the material test system at three temperatures of 25,300,500 ℃.Experimental results show that the flow stress decreases with temperature but increases with strain and strain rate.The traditional Johnson-Cook model was modified considering the thermal softening caused by the impact adiabatic process. The modified Johnson-Cook model is in good agreement with the experimental results.
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Key words:
- solid mechanics /
- constitutive model /
- SHPB /
- stainless steel /
- Johnson-Cook model /
- temperature effect /
- strain rate effect
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