Tensile mechanical properties of metal honeycomb sandwich structurewith interface connection defects

摘要

Thermal protection system is one of the key technologies of reusable launch vehicle (RLV). The ARMOR TPS is one ofimportant candidate structure of RLV. ARMOR TPS has many advantages, for example: fixing easily, longer life, goodproperties, short time of maintenance and service. In comparison with traditional TPS, the ARMOR TPS will be the bestselection for all kinds of RLV. So the ARMOR thermal protection system will be used in aviation and spaceflight fieldmore and more widely because of its much better performance. ARMOR TPS panel is above the whole ARMOR TPS,and the metal honeycomb sandwich structure is the surface of the ARMOR TPS panel. So the metal honeycombsandwich structure plays an important role in the ARMOR TPS, while it bears the flight dynamic pressure and standsagainst the flight dynamic calefaction. Because the active environment of metal honeycomb sandwich structure is veryformidable, it can produce interface connection defects which can exist in the process of manufacture as well. Tensilemechanical properties of the metallic honeycomb sandwich structure with defects are analyzed to obtain damagetolerance of the structure. The effect of shape, dimension and location of defects on the tensile mechanical properties isconducted by experimental study. Then finite element analysis is performed to validate the experimental results.Haynes214 which is a kind of super alloy materials with high performances is chosen as both face sheet and core in thispaper.