Studies on understanding the shear flow by varying geometry and skin to core weight ratios of sandwich composites help identify the failure patterns and correlate them with the observed test data. Glass/epoxy skin- rigid foam core sandwich composites used in niche applications exhibit various types of failures under static loading conditions. The current study focuses on understanding the shear flow patterns in core failure by flexure. Polyurethane and Polyisocyanuraterigidfoams of 65 kg/m3 and 126kg/m3 densities were considered for the study.Sandwich panels with glass fabric/ epoxy skin were fabricated by maintaining different skin to core weight ratios with various core thicknesses of 10mm, 25mm and 50mm.. Tensile and compressive data evaluated analytically were used to determine the shift in neutral axis for the flexural specimens by finding the ‘r’ (shift) ratio. The influence of the shift on the shear flow patterns were observed in each case and presented.