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Outline
A fuel supply pipe bracket of a passenger car broke during the whole vehicle's durability test on a rough road. This paper conducts an analysis of the working conditions, material, CAE strength and durability, fracture surface and appearance dimensions of the fuel supply pipe bracket after the test. The material analysis and CAE strength and durability analysis both meet the enterprise standards. The fracture form is determined to be fatigue fracture through fracture surface analysis, and the fracture originated from the R corner at the root of the stamped protrusion on the part surface. The cause of the fracture is determined to be stress concentration caused by the too small R corner during the stamping process through appearance and dimension and CAE analysis. By improving the structure and process parameters of the stamping die, the problem of the too small R corner at the root of the stamped protrusion on the part surface was solved, and the overall feature dimensions of the part were completely consistent with the design model. The improved bracket did not fail during the durability test on a rough road.
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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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