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Macro and micro fracture analysis shows that the ignition coil fixing bolt is mainly fractured by torsional load, and the micro fracture is a clockwise shear dimple. Through comparative analysis of simulated assembly test, the fracture surface of the failed part is consistent with the fracture surface of the bolt under pure torsional load, so the fracture mode of the bolt is torsional fracture failure (shear stress). The cause of torsional fracture may be that when the spark plug is replaced for the second time, the bolt is not screwed in normally (the internal thread is damaged or the bolt is screwed in obliquely), and the tightening torque is higher than the torsional fracture torque (14 N·m) of the bolt, which finally leads to the torsional fracture of the bolt.
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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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