Journal Published Online: 07 March 2023
Volume 51, Issue 5

A Fatigue Method in the Tension-Compression Axial Stress Control Test of Automotive Sheet Steel

CODEN: JTEVAB

Abstract

Focused on the common problem of easy buckling of specimens in the tension-compression axial stress control fatigue test of automobile sheet steel, a stress fatigue test method for thickness less than 2.5 mm was proposed. For two kinds of automobile sheet materials with different strength levels and thicknesses, fatigue specimens with different widths of test section, parallel lengths, and fillet radii are designed. Without the anti-buckling device, high-cycle fatigue tests with a stress ratio Rs = −1 at different stress levels were carried out, and the shape and size of the fatigue specimens of automobile sheet materials were determined by the number of fatigue life cycles of specimens with different sizes under the same stress cycle form. The results show that for automobile sheet steel with a thickness of 1.0–2.5 mm, the recommended sizes of the uniform-gauge fatigue specimens are width of test section w = (1–3) t, parallel length Lp = (1–3) w, and fillet radius r = (3–10) t. For automobile sheet steel with a thickness less than 1 mm, because the time-displacement curve jitters during the test, it is recommended to install an anti-buckling device, specifically the anti-buckling device with mortise and tenon structure by self-design and with a flattop structure recommended by ISO 1099-2017, Metallic Materials—Fatigue Testing—Axial Force-Controlled Method.

Author Information

Su, Hongying
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Gao, Yifei
NCS Testing Technology Co. Ltd., Central Iron and Steel Research Institute Group, Beijing, China
Lu, Yanpeng
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Hu, Zhiping
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Liu, Rendong
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Lin, Li
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Xu, Xin
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Lv, Dong
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Lu, Xiaofeng
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Cao, Zheng
Automobile and Home Application Steel Institute, Technology Center of Angang Steel Company Limited, Anshan, China
Pages: 19
Price: $25.00
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Details
Stock #: JTE20220576
ISSN: 0090-3973
DOI: 10.1520/JTE20220576