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Through-type tail lamp of a vehicle type cracks and fails during road test and it is confirmed by analysis of the cracking position that the failure is a kind of interface fatigue cracking. To address this issue, the paper confirms that mismatch between thermal expansion coefficient of Heterotropic material and mechanical properties is the cause of failure cracking. Stress distribution of lampshade is calculated by CAE software combined with sun exposure test, which shows that the stress distribution location is consistent with physical lampshade cracking. In combination of the evaluation of stress result by means of S-N curve, it rationally explains the seasonal pattern of cracking. This method is used to evaluate through-type tail lamp with different materials, colors and structures, the results shows that the highest risk of cracking appears in through-type tail lamp made from black styrene, ASA and transparent Polymethyl Methacrylate (PMMA), which is consistent with the law of after-sales statistics data.
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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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