T2铜的动态力学性能及本构关系

发布时间：2018-03-20 16:33

  本文选题：T铜　切入点：霍普金森压杆试验　出处：《中国有色金属学报》2016年07期 　论文类型：期刊论文

【摘要】：利用Gleeble1500热模拟试验机和分离式霍普金森压杆试验装置(SHPB)对T2铜进行常温下准静态压缩试验和高应变率下的冲击压缩实验,获得不同应变率下的应力-应变曲线。结果表明:T2铜在动态冲击下的强度明显高于准静态压缩下的强度,具有显著的应变率强化效应;在动态冲击较低应变速率的区域内,T2铜的塑性流动应力对应变率很敏感,具有明显的应变强化和应变率强化效应。但在动态冲击较高应变速率的区域内,发生相同变形时的应力水平相差不大,表现出对应变率变化不敏感的性质。对传统的Johnson-Cook本构模型进行修正,拟合曲线与试验曲线吻合较好。
[Abstract]:Using Gleeble1500 thermal simulator and split Hopkinson compression bar test device, the quasi-static compression tests and impact compression tests of T2 copper were carried out at room temperature and at high strain rate, respectively. The stress-strain curves at different strain rates are obtained. The results show that the strength of W T2 copper under dynamic impact is significantly higher than that under quasi-static compression, and has a significant strain rate strengthening effect. The plastic flow stress of T 2 copper is sensitive to strain rate and has obvious strain strengthening and strain rate strengthening effects in the low strain rate region of dynamic impact, but in the high strain rate region of dynamic impact, the plastic flow stress of T 2 copper is sensitive to strain rate. The stress level of the same deformation shows little difference and is insensitive to the change of strain rate. The fitting curve is in good agreement with the experimental curve by modifying the traditional Johnson-Cook constitutive model.
【作者单位】： 北京科技大学材料科学与工程学院;中国兵器装备集团公司西南技术工程研究所;
【分类号】：O347
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本文编号：1639919