Full
Outline
The characteristics of fragments, which are numerical studied with Smoothed Particle Hydrodynamic (SPH) algorithms, come from the steel cylinder subjected to the detonation of internal short cylinderical explosive charge. Grady spall model is employed to describe the spall failure of the steel cylinder. Stochastic failure is used to define the failure models, in which Mott distribution is used to depict the failure strain. Mass distribution and velocity of fragments are mainly discussed. The results show that the part near the head of explosive begins to fracture after the steel cylinder expands to a certain extent, and then the part around the explosive disaggregates to fragments. For the closed cylinder, the ends are the other weakness position. The fragments around the explosion centre are smaller with high velocity, while the fragments around cylinder ends are larger with low velocity. The fragments near the explosion centre are relatively concentrated in the space.
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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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