Experimental Researches On Structural Performance Of Tri-axial Grids Sandwich Panels

The Green Tri-axial Grids Structural Panel (TGSP) is a kind of green engineered materials, which is not only applied in bridge deck, insulation wall, roof and etc. but also used in container and packaging engineering field. TGSP is made from wood-base materials first and then through treatments of structural design and advance composited technology. It has properties of low density, high strength, fire resistant, water resistant and thermal insulation. Therefore, it will have a huge potential market and a broad application on energy conversation and low-carbon green economy.Refering to the design and manufactory method of aviation structure materials and marketing on the field of green construction materials, this thesis researches on the production process and structure-performance of tri-axial interlocked structural panels which mainly made by materials of wood-based phenolic laminated papers based on the current theory and reasearch. The thesis focuses on simulating the joint performance of TGSPs with their surfaces through beaming specimens of varied fillets in different angles and materials. The bending results showed that the factors of angle and materials of fillets directly affect the utmost mechanical performance of structure, Comparing to the TGSPs without fillets treated, the bending results of TGSPs which applied the optimizing factor of fillets in the former experiment showed that the fillet is not only resisent the delaminated of panels, but also improved the mechanical property and stability of TGSPs.This thesis researched on the out-plane compression property, in-plane compression property and bending property of TGSPs under reinforcing combinations of different materials, namely carbon fiber coating TGSPs, glass fiber coating TGSPs and another, TGSPs, urethane pour foam filled in the core. The results showed that the TGSPs had excellent mechanical properties and was satisfied with the works requirement. The carbon fiber and glass fiber apparently reinforced the bending properties of TGSPs, and carbon fiber composite TGSPs is superior to glass fiber composite TGSPs in bending load and elastic matrix results. Urethane pour foam filled in the core of TGSPs improved its buckling and increased the compression properties greatly in out-plane direction as well as in-plane direction. Based on the orthotropic laminate plate theroy, the mechanical model of TGSPs was set up by equivalent modulus. The contrast between the bending results of theoretical model and experiments showed that the results of theoretical model were consistent with the experimental results, especial in elastic phase with less error. Therefore, in this theoretical mechanical model, the modified design parameters and optimal design can be achieved by simple calculations.Meanwhile, the finite element method of ANSYS was applied in the bending analysis of TGSPs by solid model. Compared with the experimental results, the solid model of finite element was highly accurate and had limited error, however, beacuse it was a complex model and used large amount of calculation, it was not easy to modify the design parameters for optimizing redesign. Therefore, theoretical mechanical model can use to preliminary design, and finite element model can be applied for checking to ensure the accuracy and reliablity.Finally, the thesis focused on the coefficients of thermal conductivity on different kinds of TGSPs. The results showed that the TGSP is an excellent thermal resistant material. The thermal conductivity of TGSP with urethane pour foam filled in the core was only0.0761W/m·K, which is several times less than concrete and ordinary wood.