Failure Analysis of the Laser-Welded Web-Core Steel Sandwich Panel with Narrow Weld Width T-Joints

Abstract:

Static three-point bending test of the laser welded Web-core steel sandwich panel was performed. The deformation and failure of the sandwich panel with narrow weld width T-Joints were investigated. The results indicate that the deformation undertakes the following three stages: elastic deformation, plasticity deformation and T-joints cracking. The initial yield load is 25 kN, The maximum bending load is 54 kN. The high strength rate characteristic not be fully reflected. The finite simulation result shows the whole structure has no chance to reach the designed maximum value when the T-joints formed plasticity rings. Then the plastic region was developing till the weld cracked. We considered that the T-joint’s cracking is a new failure mode for the web-core steel sandwich panel. Thus, the laser welded T-joints with narrow weld width are the weakest location for the total structure. It is very necessary to consider the T-joint’s geometrical and mechanical properties for the total structural design.

• Periodical: Applied Mechanics and Materials (Volume 863)
• Pages: 311-316
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.863.311
• Online since: February 2017
• Authors: Xiao Xia Jiang, Shang Cai Fei, Shuai Zhang*, Hua Ji, Liang Zhu
• Keywords: Deformation, Failure, Panel, Three-Point Bending Test, T-Joint

References

[1] X. X. Jiang, L. Zhu, J. S. Qiao, Y. X. Wu, Z. G. Li, The strength of laser welded web-core steel sandwich plates, Appl. Mech. Mater. 551 (2014) 42-46.

DOI: 10.4028/www.scientific.net/amm.551.42

[2] M. Gao, X. Zeng, Q. Hu, J. Yan, Laser-TIG hybrid welding of ultra-fine grained steel, J. Mater. Process Tech, 209(2) (2009) 785-791.

DOI: 10.1016/j.jmatprotec.2008.02.062

[3] J. Romanoffa, P. Kujala, Formulation for the strength analysis of all steel sandwich plates, 2002, M-266, Helsinki University of Technology Ship laboratory.

[4] J. Romanoffa, Bending Response of Laser-Welded Web-core Sandwich Plates, Helsinki University of Technology, Doctoral Dissertation, (2007).

[5] H. Kolsters, D. Zenkert, Buckling of laser-welded sandwich panels, Part 1: Elastic buckling parallel to the webs, Proceed. Inst. Mech. Eng. Part M: J. Eng. Maritime, 220(2) (2006) 67-79.

DOI: 10.1243/14750902jeme33

[6] H. Kolsters, D. Zenkert, Buckling of laser-welded sandwich panels, Part 2: elastic buckling normal to the webs, Proceed. Inst. Mech. Eng. Part M: J. Eng. Maritime Environ. 220(2) (2006) 81-94.

DOI: 10.1243/14750902jeme34

[7] H. Kolsters, D. Zenkert, Buckling of laser-welded sandwich panels: Ultimate strength and experiments, Proceed. Inst. Mech. Eng. Part M: J. Eng. Maritime Environ. 224(1) (2010) 29-41.

DOI: 10.1243/14750902jeme174

[8] J. Jelovica, J. Romanoff, S. Ehlers, et al. Ultimate strength of corroded web-core sandwich beams, Mar. Struct. 31 (2013) 1-14.

DOI: 10.1016/j.marstruc.2012.12.001

[9] G. Y. Zu, R. H. Lu, X. B. Li, Zh. Y. Zhong, X. J. Ma, M. B Han, G. CH. Yao, Three-point bending behavior of aluminum foam sandwich with steel panel, Trans. Nonferrous Met. Soc. China 23 (2013) 2491-2495.

DOI: 10.1016/s1003-6326(13)62759-4

[10] X. X. Jiang, J. M. Li, R. Cao, L. Zhu, J. H. Chen, Y. X. Wu, Z. G. Li, Microstructures and properties of sandwich plane laser-welded joint of hull steel, Mater. Sci. Eng. A, 595 (2014) 43-53.

DOI: 10.1016/j.msea.2013.11.057