基于套管式Hopkinson杆的双相钢动态拉伸试验研究  

Test research on the dynamic tensility of dual-phase steel by the split pipe Hopkinson tensile bar

作　　者：谷先广[1] 李永池[1] 

机构地区：[1]中国科学技术大学近代力学系,合肥230027

出　　处：《防护工程》2013年第1期11-15,共5页Protective Engineering

摘　　要：双相钢具有高强度、高韧性、高塑性等特点，适用于抗爆及抗冲击领域。利用MTS材料试验机和分离式套管Hopkinson拉杆实验装置，测定了双相钢（DP590）在准静态（0．01／s）和动态应变率（600／s～1800／s）条件下的应力一应变曲线。实验结果表明，DP590在高应变率条件下具有应变率增强以及应变强化效应。为了体现这两种效应，对传统的Johnson—Cook（J-C）本构模型进行了修正，基于试验数据拟合得到了该材料修正的动态J-C本构参数。为了验证DP590动态本构参数的有效性，建立了薄壁管有限元模型，发现修正后的动态J-C本构关系能大幅提高碰撞仿真的精度。Dual-phase steel has characteristics of high strength, high toughness, and high plasticity, making it suit- able for both anti-blast and anti-shock applications. The tensile experiments for DP590 were carried out with a matarials testing system and a split pipe Hopkinson tensile bar apparatus, and the stress-strain curves of DP590 were measured at quasi-static condition （0. 01/s ） and high strain rates （600/s N 1800/s）. The experimental results show that DP590 is sensitive to strain rate and has strain-hardening effect. Based on the modified Johnson-Cook （J- C） constitutive model, the dynamic constitutive parameters of DP590 are obtained by fitting the experimental re- suits. In order to verify the validity of the parameters, a thin-walled finite element model is established, and the simulation presents a reasonably good fit to the experimental results. The accuracy of the simulation can be greatly improved by the modified dynamic J-C constitutive model.

关 键 词：双相钢 SHTB 应变硬化 Johnson—Cook本构模型 应变率 

分 类 号：TU452[建筑科学—岩土工程]