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In this paper, the general rules and characteristics of the failure damage of basin insulators in recent years were firstly summarized. Then, the typical failure area of sample was extracted to analyze the matrix microstructure morphology and the failure fracture surface morphology. Finally, the micro mechanical properties of the heterogeneous interface in composite materials were characterized and analyzed by nanoindentation mechanics technology, and the crack initiation and failure fracture mechanism of Al2O3/epoxy resin composite materials were expounded. The results show that the fracture toughness value of the epoxy resin matrix is about 0.55 MPa·m1/2, and the cracks originate from the epoxy resin matrix under the action of load and continuously expand. When encountering high-strength Al2O3 particles, the cracks deflect due to the retardation and rapidly expand along the interface between the particles and matrix.
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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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