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Outline
In explosive consolidation of nano-powders, the duration in which the loading changed markedly on nano-particles by shock wave is far longer than the time of stress wave propagating through the character length of the particles; and the ceramic powders behave brittleness during explosive shock consolidation. The elastic hypothesis is put forward based on the two facts mentioned above, and the hypothesis is used to deduce the stress status in particles during the process of consolidation. The three criteria of brittleness fracture of damage (Hugonoit elastic limit, dynamic yield strength and theoretical shear strength) are reviewed. The probability of fracture of ceramic particles is estimated by the intersection value of the three criteria. Based on the calculation, it is concluded that there are two maximal shear positions: one is located in the depth of 0.5 nm in particle from the contact surface, where the shear stress is maximum; the other is located further from the surface. This result offers a reference for interpreting the plasticity and fracture during the process of explosive consolidation.
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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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