Effect of L/D on penetration performance of tungsten fibre/Zr-based bulk metallic glass matrix composite rod. (December 2019)

• Record Type: Journal Article
• Authors: Du, Chengxin; Shu, Dongwei; Du, Zhonghua; Gao, Guangfa; Wang, Meng; Zhu, Zhengwang; Xu, Lizhi
• Is Part Of: International journal of refractory metals & hard materials. Volume 85(2019)
• Publication Date: 2019-12
• Subjects: L/D -- Tungsten fibre/Zr-based bulk metallic glass matrix composite (WF/Zr-MG) -- Penetration self-sharpening -- Longitudinal splitting -- Finite element method (FEM); Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2019.105042
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Tungsten fibre/Zr-based bulk metallic glass matrix composite (WF/Zr-MG) is a potential penetrator material. In the present paper, the effect of L/D on the penetration performance of WF/Zr-MG rod is studied. Experiments and finite element method (FEM) simulations of WF/Zr-MG and tungsten heavy alloy (WHA) rods with L/D of 18.33, 5.4, 3.89, 3.75 and 1.11 penetrating into armor steel targets (RHA) are conducted. The experimental results show that penetration efficiency (P/L) of WF/Zr-MG rods with L/D of 18.33, 5.4, 3.89 are higher than that of WHA rods with the same L/D, because the penetration process is long enough to include a steady state penetration self-sharpening. The steady state penetration self-sharpening results in less kinetic energy consumed of rods during penetration. Longitudinal splitting occurs in WF/Zr-MG rods with L/D of 3.75 during the penetration process, which results in a much lower P/L than that of WHA rods with L/D of 3.75. A jacket structure could prevent the longitudinal splitting and increase P/L of WF/Zr-MG rods. P/L of jacketed WF/Zr-MG rods with L/D of 1.11 is slightly lower than that of jacketed WHA rods with L/D of 1.11, because of its short penetration process without the steady state penetration self-sharpening. P/L curve fitted as a function of normalized impact velocity and L/D of the WF/Zr-MG rods into RHA shows the advantages of WF/Zr-MG rods over WHA rods increase with L/D. Highlights: When L/D > 1, WF/Zr-MG rods exhibit steady state penetration self-sharpening. With steady state penetration self-sharpening, WF/Zr-MG penetrate deeper than WHA. Longitudinal splitting is likely to occurs in WF/Zr-MG rods with small L/D. Longitudinal splitting results in non-ideal penetration and small penetration depth. Ratio of penetration depth to length of WF/Zr-MG rods decrease with increase of L/D.