薄壁异形环截面管材料环向动态拉伸特性测试

Study on a radial-direction dynamic tensile test method for a thin-walled tube structure with special ring section

针对薄壁异形环截面管状结构,结合有限元分析,提出了基于Hopkinson拉杆技术的环向材料动态拉伸实验方法;设计了特殊的夹具,采用空心透射杆提高透射波幅值;并对1Cr18Ni9Ti材料薄壁异形环截面管状结构进行不同应变率下的冲击拉伸实验。实验结果表明,该实验方法可适用于这种薄壁异形环截面管状结构,该结构具有良好的塑性变形能力,断裂应变随应变率的提高明显降低,拉伸强度随应变率的提高明显增大。

Aimed at a thin-walled tube structure with special ring section,combined with finite element analysis,a radial-directional dynamic tensile experimental method was proposed based on conventional split Hopkinson tensile bar（SHTB）.A special clamp was designed,and a hollow steel transimission bar was used to magnify the transmitted signals.For the 1Cr18Ni9Ti thin-walled tube structure,some dynamic tensile tests were implemented under different strain rates.The resulsts show that the experimental method is applicable to the thin-walled tube structure with special ring section.In addition,the special ring has a long plastic stage and the fracture strain is reduced with strain rate incressing.Moreover,the tensile strength is obviously enhanced with strain rate increasing.