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汽车安全与节能学报

汽车安全与节能学报 ›› 2015, Vol. 6 ›› Issue (03): 250-258.DOI: 10.3969/j.issn.1674-8484.2015.03.008

• 汽车安全 • 上一篇    下一篇

304 不锈钢薄壁管环向材料力学行为的实验表征

赵赫1，夏勇1，姚再起2，金建伟2   

  1. 1. 清华大学 汽车工程系，汽车安全与节能国家重点实验室，北京 100084 ； 2. 吉利汽车研究院，杭州 311228
  • 收稿日期:2015-05-15 出版日期:2015-09-25 发布日期:2015-10-12
  • 通讯作者: 夏勇，副研究员。E-mail ：xiayong@tsinghua.edu.cn
  • 作者简介:赵赫（1991—），男（汉），安徽，硕士研究生。E-mail ：zhaoh07.thu@gmail.com
  • 基金资助:

    国家“十二五”科技支撑计划项目（ 2011BAG03B02）

Experimental characterization on material mechanical behavior in the hoop direction of 304 stainless steel thin-walled tubes

ZHAO He1, XIA Yong1, YAO Zaiqi2, JIN Jianwei2   

  1. 1. Department of Automotive Engineering, State Key Laboratory of Automotive Safety and Energy, Tsinghua University,Beijing 100084, China; 2. Geely Automobile Research Institute, Hangzhou, 311228, China
  • Received:2015-05-15 Online:2015-09-25 Published:2015-10-12

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摘要：

为了改进管件内高压成形工艺，用实验研究了某种304 不锈钢薄壁金属管材料力学特性。研
究了薄壁金属管的环向材料力学行为，搭建了环向拉伸试验装置，建立了环状试件测试段受力和夹具
受力之间的关系，分析了摩擦和试件装夹位置的影响；用数字图像相关分析技术（DIC），测量了环向
拉伸应变；利用各向同性材料验证了环向拉伸试验方法的可靠性。结果表明：试验管材环向应力应变
曲线呈S 形，试验管材轴向和环向材料力学行为有显著差异。

关键词: 薄壁管, 环向拉伸, 304 不锈钢, 材料各向异性, 马氏体相变

Abstract:

Thin-walled 304 steel tube material behavior was investigated experimentally to improve the
technique of tube hydro-forming. A ring hoop tension test (RHTT) system was built, and the simplified analytical
model for the RHTT specimen was analyzed to evaluate the impact of friction and specimen position. The RHTT
specimen strain was measured by using a digital image correlation (DIC) non-contact measurement system.
The RHTT system and data processing method were verified using an isotropic material. The results show that
an “S-shape” style is detected in the measured 304 tube hoop stress strain curve in large plastic deformation
phase and there is significant difference between the material behavior in tube axial direction and that in hoop
direction.

Key words: thin-walled tube, ring hoop tension test, 304 stainless steel, material anisotropy, martensitic transformation