Mechanical Characteristic Analysis Of Hybrid Sandwich Plate With Corrugated-Cores Subjected To Slamming Impact

Sandwich structures with light weight,high strength, high impact resistance, excellent vibration and energy absorption rate and other characteristics, have received widespread attention and application around the world in the fields of vehicle engineering, shipbuilding, aerospace industry and civil engineering.In recent years, the mechanical properties, failure modes and other aspects of sandwich structures subjectedtostaticloadshave been investigated in a lot of researches for both academia and engineering significance.However, few achievements have been reported in relation to the structure-air-water three-phase coupling situation for slamming problems of sandwich structures.Therefore, the research on its dynamic behavior under loads of slamming is of great significance.The main contents are as follows:1) With hybrid sandwich plate with corrugated-coresas the object, the slamming process is simulated using the finite element software LS-DYNA, and the water pressure features, deformation distribution, failure modes and energy absorption characteristics are studied and compared to that of non-filling corrugated sandwich plate with the same weight. And on this basis, the effect of thickness of bottom plate and corrugated-core, on the peak value of slamming pressure, plate deformation and energy absorption is discussed.The results show that polyurethane foam filling can effectively improve the impact strength of hybrid sandwich plate with corrugated-cores.Within the range of parameters discussed, increasing the thickness of bottom plate and corrugated-core has positive influence on panel deformation reduction and overall stiffness enhancement, especially the thickness of corrugated-core.2) With hybrid sandwich plate with corrugated-coresas the object, the slamming process is simulated using the former FEM software and effect of three filling materials and modes on the impact strength is discussed.The results show that filler material of higher strength can significantly reduce the structural deformation of bottom plate, and the reduction of the overall deformation is more obvious.theaddition of foam material can reduce energy absorption of bottom plate and corrugated-core, and will increase that of the top plate. For the panel with a thin waterside face, the upper-filled is superior to the lower-filled in impact strength.But, in the case of panel with a thincore web, the result went into an opposite way.3) Taking the peak value of slamming pressure, panel deformation of the central point of bottom plate under slamming loads as the objective function, sample points are generated through orthogonal design approach. Using APDL language for parametric modeling, LS-DYNA analysis was conducted to obtain the sample response. Based on the numerical simulation results, the polynomialresponse surface agent model is established and the accuracy checking is carried out within the design value space, and the maximum error meets engineering demond, besides the estimated value is correlated with the calculated value.