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Based on the frontal 25% offset collision condition, a mathematical model was established for simulation analysis. 2 000 MPa hot formed steel was used to replace 1 500 MPa hot formed steel, and the hot gas expansion method was used to replace the traditional hot forming method, thus realizing lightweight design on A-pillar structure of a vehicle model. Through the simulation analysis of small offset impact performance, it was concluded that the solution of 2 000 MPa hot formed steel meets the performance requirements. Through cost comparison and analysis, due to the reduction of the number of parts, the single vehicle cost and part mass of the overall scheme of 2 000 MPa hot gas expansion have decreased. The analysis results show that the lightweight design of A-pillar based on 2 000 MPa thermal expansion is feasible, which can reduce the cost of a single vehicle by 10.51 RMB and the weight of the designed A-pillar is 27.5% lower than the original one, which makes it have good economic benefits and lightweight effect. At the same time, the application of thermal expansion reduces the section of A-pillar cavity, reduces the obstacle angle of A-pillar by 22.2%, and effectively improves the blind area of A-pillar visual field.
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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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