Research On Mechanical Properties Of Metal Honeycomb Sandwich Plate

Honeycomb sandwich structure has been widely used in astronautics, aerospace,shipping and automobile industries as an important lightweight structure. Comparedwith traditional materials, metal honeycomb Sandwich structure has manyadvantages, such as high-specific strength, high temperature mechanical stability andintegral structure design. In contrast to ideally uniform and periodic honeycombs,most realistic honeycombs have inherent imperfections microstructure due to thecomplex manufacturing process, the stability of the manufacturing parameters andother uncertainties factors which can bring adverse impacts on mechanical properties.Both intact and imperfect metal sandwich plate with hexagonal honeycomb core areinvestigated in this paper and the main contents are as follow:This paper aimed to study the superalloy honeycomb sandwich structures. First,the in-plane compressive property and the out-plane bending responses areinvestigated by theoretical analysis, experimental method and FEM. Macro elasticproperties are derived based on the fundamental mechanical models and theories; theultimate strength and the failure mode are obtained by experiments; the finite elementmethod is used to analyze the impacts of the panel thickness, core height and weldingangle and other structural parameters on the mechanical properties.Secondly, The effects of missing welding defects on in-plane compressive andout-plane bending effective elastic stiffness and initial yield strength of sandwichplate are investigated using finite element analysis method. The elastic modulus,failure modes and structure strength are obtained with the shape, dimension andposition of the defects are taken into account.Finally, the in-plane compressive behavior and the three-point bending behaviorwere both investigated by conducting the high temperature experiments on thesandwich structure at400degree centigrade and800degree centigrade, respectively.The modules and strength are obtained from the test. Then the bending test at400degree centigrade was conducted on the sandwich panel with missing welding defectbetween face sheet and core to get the impact of the defect on the mechanicalproperties.