PSI - Issue 52

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Huadong Xu et al. / Procedia Structural Integrity 52 (2024) 52–62 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 1. The configuration of shielding structure.

Fabric targets were made of multiple fabrics with an areal density equivalent to a 4 mm thick 5A06 Al plate. All targets have a similar areal density of about 10800±200 g/ ㎡ , with a planar dimension of 200 mm ×200 mm. The detailed parameters of the targets, such as the areal density of single layer fabric, the number of layers, and the total areal density are described in Table 1. The witness plate is installed behind the target, with an approximately 100 mm stand-off distance. The witness plate is composed of 4 layers of 1 mm thickness and 200 mm×200 mm size 5A06 Al plate, which is convenient to analyze the penetration of the target and the characteristics of fragments generated by projectile impact. All target specimens were impacted with 3.97 mm Al-2017 spheres (nominal mass: 0.09 ± 0.002 g) with the velocities of 4.0 ~ 4.2 km/s. 2.3. Experimental setup for HVI HVI experiments had been conducted with the help of a two-stage light-gas gun facility. Make up and installation process of the fabric target is shown in Fig. 2.

Fig. 2. HVI experiments equipment. (a) Fabric target. (b) Target holder. (c) Experimental chamber room.

The fabric was stacked along the thickness direction and glued on the edge, effectively preventing the yarn from pulling off and clamping the edge. The target assembly, consisting of the two steel plates and the fabric specimen, was held together by fasteners located around the target, effectively inducing clamped boundary conditions on targets, as shown in Fig. 2(a) and (b). Chamber room for target installation is located in two-stage light-gas gun, as shown in Fig. 2(c). In order to simulate the space environment, the target chamber was vacuumed, and the ambient pressure was lower than 200 Pa. The velocities of the projectiles were measured by electromagnetic velocity measurer.