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To study dynamic response and overall damage modes of warship subjected to underwater explosion in near field, a ship-like model was designed based on similarity criterion. The dynamic response was investigated by changing stand-off and weight of explosive in experiments where four kinds of explosives were located closely under the mid-span of the hull girder. In experiments, high-speed photography was applied to obtain the girder's movement process. Simultaneously, the data of strain and acceleration was attained to make a detail analysis on how the object reacts against shock wave and bubble. Experimental results show that there exits a low-pressure fluid zone below the girder due to bubble pulse in near field. The low-pressure area makes the girder undergo a vertical bending moment and possibly suffer an overall bending damage. With the increase of stand-off, the relevance of explosion energy and damage effect gradually increases. If stand-off is close to the maximum bubble radius, the bubble will exert a maximum damage effect on the structure.
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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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