Browse > Article

Fatigue Life Evaluation of Spot Weldments of SPC Sheet Including Strain Rate Effect  

Song, Joon-Hyuk (Jeonju Machinery Research Center)
Nah, Seok-Chan (Division of Mechanical & Aerospace System Engineering, Chonbuk National University)
Yu, Hyo-Sun (Division of Mechanical & Aerospace System Engineering, Chonbuk National University)
Kang, Hee-Yong (Division of Mechanical & Aerospace System Engineering, Chonbuk National University)
Yang, Sung-Mo (Division of Mechanical & Aerospace System Engineering, Chonbuk National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.1, 2006 , pp. 48-53 More about this Journal
Abstract
A methodology is described for predicting the fatigue life of the resistance spot weldment including strain rate effect. Because it is difficult to perform a physical failure test with high strain rate, an analytical method is necessary to get the mechanical properties of various strain rate, To this end, quasi-static tensile-shear tests at several strain rate were performed on spot weldments of SPC. These test provided the empirical data with the strain rate. With these results, we formulated the function of fatigue life prediction using the lethargy coefficient which is the global material property from tensile test. And, we predicted the fatigue life of spot weldment at dynamic strain rate. To confirm this method for fatigue life prediction, analytical results were compared with the experimental fatigue data.
Keywords
Lethargy coefficient; Spot weldments; Quasi-static tensile-shear test; SPC; Strain rate effect; Fatigue life;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 H. Kitagawa, T. Satoh and M. Fujimoto, 'Fatigue Strength of Single Spot-Welded Joints of Rephosphorized High-Strength and Low-Carbon Steel Sheets,' SAE 850371, pp.114-126, 1985
2 J. H. Song, H. G. Noh, H. Y. Kang and S. M. Yang, 'Estimation of Fatigue Strength with Practical Dynamic Force by Inverse Problem and Lethargy Coefficient,' Transactions of KSAE, Vol.12, No.1, pp.106-113, 2004
3 D. A. Chatfield and R. R. Rote, 'Strain Rate Effect on the Properties of High Strength Low Allow Steels,' SAE 740077, 1977
4 A. S. Korhonen and H. J. Kleemola, 'Effects of Strain Rate and Deformation Heating in Tensile Testing,' Metall. Trans. A, Vol.9A, pp.979-986, 1978
5 S. H. Song, Y. J. Yang and J. W. Jeon, 'A Fatigue Behavior for Spot Welded Steel Plate Carbon C by the Variation of the Interval Between Two Spots,' Proceedings of KSME A, Vol.24, No.11, pp.2845-2852, 2000
6 H. S. Yu, 'A Study on Ultrasonic Test for Evaluation of Spot Weldability in Automotive Materials,' KSME International Journal, Vol. 13, No.12, pp.775-782, 1999   DOI
7 H. S. Yu, S. I. Lee, I. H. Kwon and B. G. An, 'Fatigue Life Evaluation of Spot Weldment Using DCPDM,' Journal of KWS, Vol.19, No.1, pp.58-64, 2001
8 D. H. Bae, I. S. Sohn, W. S. Jung and H. K. Lee, 'Fracture Mechanical Fatigue Strength Evaluation of IB- Type Spot Welded Lap Joint under Tension-Shear Load,' KSME International Journal, Vol.6, No.5, pp.20-27, 1998
9 M. Mizui, T. Sekine, A. Tsujimura, T. Takishima and Y. Shimazaki, 'An Evaluation of Fatigue Strength for Various Kinds of Spot-Welded Test Specimen,' SAE 880375, pp.382-391, 1988
10 J. H. Song, H. G. Noh, H. S. Yu, H. Y. Kang and S. M. Yang, 'Estimation of Fatigue Life by Lethargy Coefficient using Molecular Dynamic Simulation,' Int. J. Automotive Technology, Vol.5, No.3, pp.215-219, 2004