Full
Outline
The explosives initiation by simultaneous impact from two fragments was simulated based on Lee-Tarver ignition and growth model by using finite element code LS-DYNA. In order to verify the simulation method and parameters, the courses that tungsten spheres with different diameters impacted tantalum covered Composition B charges were simulated, and the critical velocity to ignite Composition B was gained, which accorded well with the experimental results. The problems that two tungsten spheres with three kinds of diameters impacted Composition B charges were simulated. It can be found that the critical velocity to ignite explosives by two fragments, which was lower than one tungsten sphere condition, varied with the distance between the two fragments approximately in term of parabolic curve. When the impact velocity was equal to or slightly larger than the critical velocity, there can be different shapes of detonation wave appearing in the charge, including spherical, W-shape, V-shape, VW-shape and so on.
15
2
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
