| Abstract:In this study, aramid III paper honeycomb lattice materials were prepared from aramid III chopped fibers, meta-sedimentation fibers and waterborne polyimide resins, and the effects of the length and content of chopped fiber on the structure and tensile strength, elastic modulus, elongation at break and tearing strength of the lattice materials were studied, and the mechanical properties of aramid III paper honeycomb were predicted by the mechanical property parameters of the lattice materials. The results show that the tensile strength of the lattice material decreases first and then increases with the increase of the length of the chopped fiber, and the elastic modulus increases with the increase of the length of the chopped fiber, and the theoretical value of the compressive and shear properties of aramid III paper honeycomb is the maximum when the length of the chopped fiber is 6 mm. The tensile strength and elastic modulus of the lattice material first increased and then decreased with the increase of chopped fiber content, reaching the maximum value of 86.3 MPa and 5698 MPa when the chopped fiber content was 60%, respectively, and the tearing strength increased with the increase of chopped fiber content, reaching the maximum value of 1081 mN when the chopped fiber content was 90%, the theoretical value of the compressive strength of aramid III paper honeycomb had a maximum value when the chopped fiber content was 90%, and the flat compression modulus of aramid III paper honeycomb, The theoretical values of the L- and W-direction shear modulus have a maximum value when the chopped fiber content is 80%. |