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Outline
In order to study the relation of powder liner material density and performance of the shaped charge jet, the curves of shaped jet velocity, jet particle momentum and jet particle kinetic energy with respect to the liner density were calculated under the same charge conditions, according to the Birkhoff's steady theory and Gurney's formula of crushed speed. In the same charge structure, the jet velocity and penetration power of two kinds of powder liner were tested, whose mass ratios of W to Cu were 0.5∶0.5 and 0.4∶0.6 respectively. It is found that the experimental results are well in agreement with the calculation results. Therefore, it is considered that the calculated curves have certain reference values, and the penetration power can be increased effectively by improving the density of powder liner.
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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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