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FROM:
Jelovica, Jasmin (1), Romanoff, Jani (1), Ehlers, Sören (2) and Varsta, Petri (1)
(1) Department of Applied Mechanics / Marine Technology, Aalto University School of Engineering, P.O. Box 15300, 00076 Aalto, Finland
(2) Department of Marine Technology, Norwegian University of Science and Technology, 7491 Trondheim, Norway
“Influence of weld stiffness on buckling strength of laser-welded web-core sandwich plates”, Journal of Constructional Steel Research. Vol. 77. p. 12-18, 2012, DOI: 10.1016/j.jcsr.2012.05.001.
ABSTRACT: This paper investigates the influence of weld rotation stiffness on the global bifurcation buckling strength of laser-welded web-core sandwich plates. The study is carried out using two methods, the first is the equivalent single-layer theory approach solved analytically for simply supported plates and numerically for clamped plates. First-order shear deformation theory is used. The second method is the three-dimensional model of a sandwich plate solved with finite element method. Both approaches consider the weld through its rotation stiffness. The weld rotation stiffness affects the transverse shear stiffness. Plates are loaded in the web plate direction. Four different cross-sections are considered. Weld stiffness is taken from experimental results presented in the literature. The results show a maximum of 24% decrease in buckling strength. The strength was affected more in plates with high reduction of transverse shear stiffness and high bending stiffness. Furthermore, clamped plates were influenced more than simply supported. The intersection between buckling modes shifted towards higher aspect ratios, in the maximum case by 24%. The results show the importance of considering the deforming weld in buckling analysis.
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