Full
Outline
When the penetration velocity is greater than the sound speed, a shock wave will be formed which leads the state parameters of the material change after shock wave front. As the shock wave affects the process of jet penetration and crater growth, Bernoulli equation can not be used directly across shock wave front. On the basis of considering the influence of shock wave during jet penetration, the mechanical properties of axial penetration and radial crater growth are analyzed in the process of shaped charge jet penetration, and the propagation and strength degradation of shock wave are assumed. The penetration model is established for the two cases of the penetration velocities greater or less than the sound speed of target respectively and a new equation of shaped charge jet penetration and radial crater growth is proposed. Compared with Szendrei-Held model, the results show that this model is more suitable for the experimental data of Held et al. Moreover, the influence of shock wave on axial penetration is much smaller than that on the radial crater growth.
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| 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 |
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