Deflection of a Web-Core Sandwich Beam in Weak Direction

The method for calculating the deflection of a web-core sandwich panel in its weak direction is based on complex shell and plate theory. A simple method was presented by assuming inflection points are located at the mid-span of the facing plate segment between two adjacent web cores. It also assumes that an inflection point also exists at the midheight of the web core. Based on these assumptions, a very simple equation was proposed. However, these assumptions are necessary to be evaluated for its suitability since the geometry of a web-core sandwich can be much different in theoretical design. This study then carries out a parametric study to find the validity range of the presented equation for calculating the deflection of a web-core sandwich panel in its weak direction. In the parametric study, finite element method is used to analyze such deflection. The parametric study shows that the accuracy of the presented equation is acceptable when the flexural stiffness per length of the web core is not less than that of the facing plates. This conclusion can be considered in practical design stage.