Welcome to Journal of Automotive Safety and Energy,
汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2015, Vol. 6 ›› Issue (03): 250-258.DOI: 10.3969/j.issn.1674-8484.2015.03.008

• Automotive Safety • Previous Articles     Next Articles

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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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