Impact Tests on High-Strength Membrane Materials under Biaxial Loads

摘要

Impact tests on high-strength membrane materials under biaxial loads were experimentally conducted in order to evaluate impact fracture properties of the membrane fabrics for the inflated applications. Cruciform specimens of the membrane materials were fabricated for applying biaxial loadings during the impact test. A steel ball was shot with using compressed nitrogen gas gun, and struck the membrane specimen. The diameter and the speed of the projectile were set to be 5mm and 200 m/s, respectively. Photographs of the impact fracture process were taken with using an ultra-high speed camera, and crack length in the specimen caused by the penetration of the projectile was measured in each biaxial loading condition. The results of the measured crack length and the ultra-high speed photographs indicate the effects of biaxial loading level and ratio on the fracture of membrane fabrics. Crack length due to the impact increases with applied tensile load, and impact damages of membrane materials under biaxial loadings were smaller than those of under uniaxial loadings.