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Outline
With the application of Rubin's penetration theory and the velocity potential model, some new results of penetration problem are presented in this paper. A code according to this model was written to calculate penetration problems of long rod projectile with conical-nose, ogive-nose and spherical nose. The results of penetration depths and residual velocity were compared with the experimental data to analysis the adaptability of the model to varied kinds of noses. The comparison showed that the results given by the theoretical penetration model are in good agreement with the experiments for ogive-nose rod projectile. Then we used the theoretical penetration model to study the scaling penetration problems of ogive-nose projectile impacting on aluminum targets. The calculated results testified the conclusion that the normalized penetration depths and residual velocity are equal. Meanwhile we drew an important conclusion that the deceleration of the projectile are inverse proportion to the size. Finally, using the theoretical model, we made a trial to calculate penetration problems of the concrete targets, presented some results consistent with the experiments, and gave a delicate analysis.
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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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