Fabrication of graded density impactor via underwater shock wave and quasi-isentropic compression testing at two-stage gas gun facility |
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Authors: | Wei Sun Xiaojie Li Kazuyuki Hokamoto |
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Institution: | 1. School of Ocean Science & Technology, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Panjin, 124000, Liaoning, China 2. Shock Wave and Condensed Matter Research Center, Kumamoto University, Kurokami 2-39-1, Kumamoto City, 860-8555, Japan
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Abstract: | We show direct evidence that underwater shock wave enables us to bond multithin plates with flat, parallel, and high-strength interfaces, which are key requirements for functionally graded material (also called graded density impactor). This phenomenon is ascribed to the super short duration of the high-speed underwater shock wave, reducing the surface tension, diffusion, evaporation, deposition, and viscous flow of matter. Thin magnesium, aluminum, titanium, copper, and molybdenum foils were welded together and designed with the increase in density. Experimental evidence and numerical simulation show that well bonding between the multilayer structures. Microstructure examinations reveal that the dominant interfacial form shifts from waviness to linearity. Graded density impactor with multilayer structure is proved that can produce quasi-isentropic compression in two-stage gas gun experiment with a designed pressure loading profile, which suggests a feasible method to simulate the conditions we want to study that were previously inaccessible in a precisely controlled laboratory environment. |
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