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Sandwich Structure

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1.Introduction In today's modern living era, the quest for alternate solutions to technically challenge problems isnever ending. Many researchers have proposed variety of tailored materials to match thespecific requirement. Out of these materials, sandwich composites are preferred structures for best stiffness over lightness ratio [1-3]. In modern living many structures made up of conventional materials are replaced by sandwich construction due to their superior performance, durability and extremely low weight. A sandwich structure will offer different mechanical properties with the use of different types of materials, because the overall performance depend on many parameters such as the properties of the constituents,face sheets, core and …show more content…

material properties mismatch. Thus it is essential to know the bending and shear properties these modified structural elements prior to manufacture. There are many experimental techniques [9] numerical methods to evaluate the properties and these techniques need the results of both 3P-point and 4P-bending tests. However the proposed technique needs only the results ofmulti specimen3P-bending testfor different span length. This method of evaluation includes the average effect of slope of load (F) v/s deflection(y) and graphical extrapolation that leads to more close results compared to actual results.The present experimental investigation was mainly focus on evaluation of apparent shear modulus of multilayer polyurethane foam cored sandwich beams and to study the effect of layer order on shear properties. To pursue this task, series of experimental three-point bending tests were conducted on sandwich beams made up of composite face sheets (Bi-woven E-glass/epoxy resin) and multilayer polyurethane foam coreof differentlayered density and span lengths. Beams of various layer configurationswereexperimented in order to study the effect of layer order on the apparent shear modulus.Prior toactual task and to get more confidence on this novel technique and alsoto understand the experimental procedure necessary for the present investigation, some samples of sandwich beams of single PUF core of known densities were tested to evaluate the shear modulus(Gc) and compared the results with existing data as shown

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