Design of sandwich structures for concentrated loading

Improved high order analysis of sandwich beams by considering a bilinear elasto-plastic behavior of core: An analytical and experimental investigation

“…6. As seen, the comparison among the results reveals that the solution from the present theory is very close to that of the HSAPT [25] in which the face sheets follow the classical beam theory (CLPT). However, the little difference between the results of the present theory and HSAPT [25] is due to the FSDT gives more deflection in comparison with the one obtained from CLPT at the same level of loading.…”

“…Due to the lack of any results on the high order approach of sandwich panel's theory in which the face sheets follow the FSDT in the open literature, the obtained results of present theory based on the elastic assumption for the response of the simply supported sandwich panel are compared with analytical results that were presented by Kim and Swanson[25]. The geometrical parameters of the studied panel are: length L=152.4mm, width b=25.4 mm, core thickness c= 6.35mm and face sheet thicknesses h t =h b =0.526mm.…”

On the non-linear high-order theory of unidirectional sandwich panels with a transversely flexible core

“…Linear analyses of localized effects in sandwich panels, especially in the vicinity of localized and concentrated loads and supports, have been investigated by several authors including: Thomsen using an elastic foundation approach (Thomsen, 1995) as well as the chapters on localized effects in Zenkert (1995Zenkert ( , 1997, linear elasticity solutions, see Kim and Swanson (2001) and by Frostig using an enhanced model with the High-Order Sandwich Panel Theory (HSAPT) approach, see Frostig et al (1992). The HSAPT approach has been successfully applied to linear and nonlinear applications in the field of sandwich structures by the authors as well as by others, such as: delamination at face-core interfaces in bending of unidirectional sandwich panels, see Frostig (1992); buckling analysis of sandwich panels through linearization of the non-linear HSAPT equations, see Frostig and Baruch (1993); buckling analysis of sandwich plates through the non-linear plate equations of the HSAPT, see Frostig (1998); experimental validation and verification through photoelastic measurements, see Thomsen and Frostig (1997); analysis of the non-linear behavior of sandwich panels with rigid and non-rigid interfaces including branching behavior due to in-plane compressive loads, see Sokolinsky and Frostig (2000); special non-linear behavior, see Sokolinsky et al (2002); comparisons of results obtained using the high-order approach, theory of elasticity and FEA results have revealed a good agreement including the correct location and regions of the localized effects, see Swanson (1999); indentation resistance failure analysis using the high-order approach, see Sutcliffe (1999, 2000); and recently an experimental and analytical study of four points bending, see Sokolinsky et al (2003), in which the non-linear response is characterized experimentally.…”

Numerical simulations of structural behavior of sandwich panels subjected to concentrated static loads

“…The examination of the composite sandwich panels made of glass fibre reinforced polymer facings and a modified phenolic core was presented in [1]. The experiments carried out on foam core sandwich beams with carbon/epoxy facings were discussed in [2]. The results of classical sandwich panel testing used in civil engineering were presented in [3].…”