碳化钨合金的动态本构关系研究

Study on Constitutive Equation of One Tungsten Carbide Alloy

利用改进的霍普金森压杆实验方法对一种新型碳化钨合金进行了动态压缩加载实验,获取了从200到510 s-1应变率碳化钨合金的应力-应变曲线,得到了本构模型参量。结果表明,碳化钨合金属弹脆性材料,随着应变率由200增加至510 s-1,最大应变值由0.008逐渐增加至0.026,但应力峰值均约为2.10 GPa;采用一维弹脆性损伤本构模型,对实验数据进行了拟合,拟合曲线和实验曲线吻合良好。

Dynamic mechanical behavior of one new-type tungsten carbide alloy was investigated experimentally by split Hopkinson pressure bar(SHPB).The stress-strain curves in the strain rate range of 200~510 s-1 were obtained and the constitutive model parameters were fitted.The results show that the alloy is nonlinear elastic-brittle material,mechanical behaviors of the alloy exhibit obviously strain rate-dependent,andwith the increase of strain rate from 200 to 510 s-1,the maximum strain value gradually increases from 0.008 to 0.026,but the peak stress is about 2.10 GPa.A strain-rate dependent damage-modified nonlinear elastic dynamic constitutive equation was obtained by fitting the SHPB test data.The fitting curve agrees well with the experimental curve.