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| Study on resistance of lightweight sandwich curve plates with metal foam core to blast loadings |
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Abstract Sandwich structures have been widely used in engineering structures to resist the intense blast loadings due to the high specific strength, high specific stiffness, superior energy absorption, easily shaped to curved configurations, easily formed with integral face-sheets, and multifunctionality. Compared with the sandwich flat structures, the sandwich curve plates have different performances and will provide much more choices for the design of structures. In the past decades, more attentions focused on the dynamic response of sandwich flat structures. Investigations of the sandwich curve structures are few. In this paper, finite element analysis is performed to study on the dynamic response of fully clamped sandwich curve plates subjected to blast loading. The maximum deflections and maximum kinetic energy of the sandwich curve plate, sandwich flat plate, solid monolithic curve plate and solid monolithic flat plate of the same mass are compared. Evolution process of blast wave produced by TNT explosive on the surface of the sandwich flat and curve plates are presented. Central velocity, central deflection of inner and outer face sheets, and kinetic energy of structure versus time of the sandwich curve plate under TNT explosive loading are analyzed. Effects of different curvature and asymmetric factor on dynamic response of the sandwich curve structures are discussed. It is shown that the resistance of sandwich curve plate is the best among the plates subjected to blast loadings. Increasing the curvature of the sandwich curve plate can result in increasing of the blast resistance of the structure. In the certain range, increasing the thickness of the outer face sheet can decrease the deflection of the inner face sheet, and the resistance of the sandwich curve plate can be increased under the blast loading. The optimal asymmetric factor making the best blast resistance of the sandwich curve plate is obtained.
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Received: 20 March 2017
Published: 28 October 2017
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2017, Vol. 38 
