Influence of weld stiffness on buckling strength of laser-welded web-core sandwich plates

Loading...
Thumbnail Image

Access rights

© 2012 Elsevier. This is the post print version of the following article: Jelovica, Jasmin & Romanoff, Jani & Ehlers, Sören & Varsta, Petri. 2012. Influence of weld stiffness on buckling strength of laser-welded web-core sandwich plates. Journal of Constructional Steel Research. Volume 77. p. 12-18. DOI: 10.1016/j.jcsr.2012.05.001, which has been published in final form at http://www.sciencedirect.com/science/article/pii/S0143974X12001137.

URL

Journal Title

Journal ISSN

Volume Title

School of Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2012

Major/Subject

Mcode

Degree programme

Language

en

Pages

p. 12-18.

Series

Journal of Constructional Steel Research, Volume 77

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.

Description

Keywords

Buckling strength, global buckling, laser weld, rotation stiffness, stiffness, web core, plate

Other note

Citation

Jelovica, Jasmin & Romanoff, Jani & Ehlers, Sören & Varsta, Petri. 2012. Influence of weld stiffness on buckling strength of laser-welded web-core sandwich plates. Journal of Constructional Steel Research. Volume 77. p. 12-18. DOI: 10.1016/j.jcsr.2012.05.001.