Full
Outline
Friction is important in the production and application of pyrotechnics, and the dynamic friction coefficient is a key parameter for quantitative analyzing the friction work. A new method for determining the dynamic friction coefficient is presented, which combines the physical model of MGY-1 friction device with theoretical analysis and numerical calculations. The dynamic friction coefficients of three pyrotechnic simple substances including potassium nitrate, magnesium and aluminum alloy and sulfur, and two pyrotechnic compounds are measured using this method. The results show that the dynamic friction coefficients of the pyrotechnics are range values, and the dynamic friction coefficient of potassium nitrate decreases with the addition of magnesium and aluminum alloy and sulfur. Moreover the reasons for producing above two phenomena are analyzed theoretically.
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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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