预张力纤维织物超高速碰撞热-力学特性分析

In an inflatable capsule, a bearing layer, which consists of high-performance fiber fabrics, is always used to bear its internal pressure load and to provide space debris protection. The pre-tension of the fiber fabric bearing layer, resulting from the pressure load, has a significant effect on the characteristics of the fiber fabric under space debris hypervelocity impact, thereby affecting the space debris protection performance of the inflatable capsule. To consider the thermo-mechanical behavior during hypervelocity impact, a numerical model for hypervelocity impact on pre-tensioned fiber fabrics is developed by introducing the Johnson-Cook strength model and Mie-Grüneisen state equation. The finite element method-smoothed particle hydrodynamics (FEM-SPH) coupling algorithm is used to discrete the yarn weaving structure of fiber fabrics. A fabric panel that has a rectangular configuration is pre-stretched by applying tensile stress boundary conditions. A projectile is then launched at a preset velocity and hit the four-side clamped pre-tensioned fiber fabric to simulate the hypervelocity impact process. The thermal-mechanical properties and space debris protection performance of the pre-tensioned fiber fabrics under hypervelocity impact are analyzed. The results show that with an increase in pre-tension, the perforation diameter of the fiber fabric increases, while the diffusion angle of the debris, as well as the absorption rate of the projectile kinetic energy and the temperature of the impact area, decrease. As a result, the pre-tension significantly reduces the space debris protection performance of the fiber fabrics.