The uniaxial tensile mechanical properties of polyester filament-TPU composite fabric membranes under high and low temperature environments

With the advancement in the field of membrane structures, the development of new materials and innovative structures suitable for both high and low temperature environments has become a primary direction for future growth. This paper investigates the uniaxial tensile mechanical properties of the newly developed polyester filament-TPU composite fabric membrane (PF-TPU) under high and low temperature conditions. Additionally, numerical simulation was conducted on the self-designed rapidly deployable inflatable membrane structure tent. The study has yielded the relationship between the mechanical properties of the membrane material and temperature variations, as well as a preliminary assessment of the feasibility of the structural design. The results indicate that the PF-TPU membrane material possesses high tensile strength, with both the warp and weft directions, denoted as σ_uMD and σ_uTD, exhibiting tensile strengths greater than 200 kN/m at room temperature (25°C). As the temperature increases, both the tensile strength and the elastic modulus of the membrane material gradually decrease. The constitutive relationship curves of the membrane material in both the warp and weft directions exhibit a distinct three-stage characteristic. Inflatable membrane structure tents that can be quickly deployed and retracted can withstand the effects of wind and snow loads in high and low temperature environments. Adding external supports can further enhance the stability of the structure. Taking the wind load application and restoration to stability as an example, the internal pressure is beneficial in the first two stages, and in the final stage, the structure can be adjusted appropriately to be in the optimal stress state.