Mechanical Characteristic Analysis Of Corrugated-core Sandwich Plates Subjected To Slamming Impact

Sandwich Structures are comprehensively used in aerospace, ship design and marinestructure field. They hold significant advantages of light-weighted, high specific strength,strong capacity of anti-buckling, sound-absorbing, insulation and so on. In this paper, withthe help of commercial FEM (Finite Element Methods) software ANSYS LS-DYNA,comprehensive and detailed analyses were conducted focusing on the slamming pressureand responses of V-core sandwich plates, I-core sandwich plates and I-core hybridsandwich plates when they are subjected to slamming impact.This paper firstly aimed at the analysis of flow-solid coupling nonlinear dynamicbehaviors of the V-core sandwich plates when it is slamming into water at differentvelocities (1m/s-6m/s). A air-water-solid three-phase simulation model was established forV-core sandwich plates to find its characters of slamming pressure distribution togetherwith the law of structure deformation; then a comparison of the nonlinear mechanicalbehaviors was made between the V-core sandwich plates and stiffened plates with thesame weight. Simultaneously, the influences of V-core sandwich plates’ different designparameters to its response were studied. The results show that: There is an approximatelylinear relationship between the water entry velocity and the slamming pressure peak of thebottom plate’s central point; the deformation of bottom plate becomes larger with theincrease of water-entry velocity; Compared to stiffened plates with the same weight,V-core sandwich plates shows much better anti-slamming performance; Within a certainrange, increasing the thickness of bottom plate and core helps to improve theanti-slamming performance of V-core sandwich plates.Then, the same simulation method was applied to study the slamming responses ofI-core sandwich plates. The results show that: There is also an approximately linearrelationship between the water-entry velocity and the slamming pressure peak of thebottom plate’s central point; the deformation of the panel becomes larger with the increaseof water-entry velocity; Compared to stiffened plates with the same weight, I-coresandwich plates has smaller deformation, however, the slamming pressure on typicalpositions and the averaged pressure on bottom plate are larger; Buckling failure will occur during the process of slamming into water when the thickness of the core is relativelysmall; the thickness of the plates and core has explicit influences on the slammingpressure and deformation response of I-core sandwich platesAt last, this paper tried to build a FEM modeling method of I-core hybrid sandwichstructures; then studied its pressure loads and deformation response when slamming intowater. In this part of research, aluminum foam with the density ratio of0.15was chosen asthe filler material. Through detailed calculation and analysis, following conclusions weredraw:1. Compared to I-core sandwich plates with corresponding size, I-core hybridsandwich structures suffers a larger averaged slamming pressure; also the slammingpressure is relatively large at typical positions (Central point of bottom plate);2. Localdeformation is much smaller compared with I-core sandwich plates at corresponding size.The research of this thesis is a useful reference to deeply understand the mechanicalbehavior and failure mechanism of the corrugated-core sandwich plates, I-core hybridsandwich plates subjected to slamming loads...