Numéro |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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Page(s) | 1175 - 1181 | |
DOI | https://doi.org/10.1051/jp4:2006134179 | |
Publié en ligne | 26 juillet 2006 |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 1175-1181
DOI: 10.1051/jp4:2006134179
Effects of strain-rate and pre-fatigue on tensile properties of laser welded joint of high strength steel plates
H. Kobayashi1, M. Daimaruya2, H. Tsuda3 and K. Horikawa11 Department of Mechanical Science and Bioengineering, Osaka University, 1-3, Machikaneyama, Toyonaka 560-8531, Japan
2 Department of Mechanical Systems Engineering, Muroran Institute of Technology, 27-1, Mizumoto, Muroran 050-8585, Japan
3 Suzuki Motor Co. Ltd., 300 Takatsuka-cho, Hamamatsu 432-8611, Japan
Published online: 26 July 2006
Abstract
The impact tensile properties of laser welded butt joints
of two kinds of high strength steel plates with the tensile strength level
of 590 MPa and 780 MPa (denoted by HR590 and HR780, respectively), were
investigated using split Hopkinson bar tensile testing apparatus. Impact
tension tests for the joint specimens pre-fatigued were also carried out to
examine the effect of pre-fatigue. There were no significant effects of
strain-rate and pre-fatigue on the dynamic and quasi-static tensile strength
of laser welded butt joints. However, the decrease in the elongation of
HR780 welded joints subjected high cycle pre-fatigue was observed only at a
high strain-rate. From the observation of fracture surface, it was found
that the decrease in the elongation may be caused by a number of damages due
to the combination of high cycle pre-fatigue and high strain-rate.
© EDP Sciences 2006