Notes on Projectile Impact Analyses by Hao Wu & Yong Peng & Xiangzhen Kong

Author:Hao Wu & Yong Peng & Xiangzhen Kong
Language: eng
Format: epub
ISBN: 9789811332531
Publisher: Springer Singapore

4.2.1 EFP Impact Test

4.2.1.1 Shaped Charge

Figure 4.1 shows the schematic diagram and dimensions of the SC in the present test, which mainly consists of the detonator, detonator base, booster, cover plate, explosive, casing, and metal liner. Ri and Ro denote the inner and outer radiuses of the spherical segment liner; thus, the constant thickness of the liner is 1.8 mm. After the inner explosive is detonated, the detonation wave propagates within the explosive at the velocity of about 8 km/s. When the detonation wave arrives at the metal liner, the liner is accelerated and warped in the axial direction. Finally, a projectile-like metal fragment is formed at the velocity generally between 1 and 2 km/s.

The detonator base, cover plate, and casing are made from 2A12 aluminum alloy, while the explosive filled into the casing and booster is Comp B. As shown in Fig. 4.2, two kinds of liner materials, i.e., T2 copper and 2A12 aluminum alloy, are adopted. T2 copper is widely used as SC liner for the properties of high density (8.96 g/cm3), low yield strength (90 MPa), and good elongation (45–50%). While the 2A12 aluminum alloy is an important material applied in aerospace and military fields for the characteristics of low density (2.785 g/cm3) and high yield strength (265 MPa). The mass of the precursor SC is 62.2 g (liner 5.6 g, explosive 12.9 g, and casing 43.7 g) with liner materials of T2 copper.

Fig. 4.2Shaped charges with liner of a T2 copper and b 2A12 aluminum alloy.

Reprinted from Hu et al. (2017a), copyright 2019, with permission from Elsevier

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