Study On Preparation And Mechanical Behavior Of Carbon Fiber Reinforced Plastic Lattice Truss Sandwich Cylindrical Shell

Because of its low density、excellent mechanical properties and the capability of reserving space for the conduction of heat, lattice truss sandwich structure of carbon fiber reinforced plastic has broad application prospects in the aerospace field as a new kind of structural materials with light weight and high strength. Aimed at lattice sandwich structures of carbon fiber reinforced plastic, this paper carried out the research on pyramid lattice mandrel preparation technology. The study has been implemented from structural design, preparation and mechanical property evaluation.Through scanning electron microscope specimens cut surface cutting by several used carbon fiber reinforced plastic composites processing methods were observed.water jet cutting manner may causing the stratification of carbon fiber laminate probability, the resin may born down the edge of the ablated, however, carved engraving machine mode cause minimal damage.Present usage of the preparation of the pyramid lattice sandwich structure during the interlocking assembly, too much manual operation to worker lead to the low production efficiency, and has prepared more difficult to ensure the accuracy of the test piece, the paper designed a pressing mold so that the core can be integrated molding pyramid lattice, which greatly improves the efficiency of the preparation of the specimen.It is analyzed that the main failure mode of flat type specimen is the fracture of diagonal rod by plain compression performance testing, Pressure resistance is0.57 MPa and Pressure modulus is 11.4MPa;its main failure mode is the fracture of part of diagonal rod and then detachment of core and surface by Shear Performance Testing, shear resistance is 0.51 MPa, shear modulus is 13.71 MPa.Through vibration performance testing to cylindrical specimen with different thickness(0.4mm、0.6mm and 0.8mm), it is discovered the thicker the specimen is,the higher the natural frequency is and the stronger the resistance for shock;Through axial compression performance under load testing, it is found that the specimen failure mode is local buckling occurs first panel and then crushed, but with the increase in the thickness of the specimen, local buckling of the time is gradually reduced, panel crushed as the main failure mode, can withstand the limit load is gradually increasing.