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Outline
To study the applicability and advantages and disadvantages of recycled plastics in the automotive field, bumpers skins are made from recycled and virgin polypropylene plastics (RPP and VPP), and the low-speed collision performance of the 2 materials'bumpers is compared and analyzed using a pendulum impact system. The results show that no fracture occurred after the test of the 2 material bumpers under different impact strengths, but the width of the RPP bumper abrasion is larger than that of the VPP, and the visual performance is not excellent. The impact force generated by the collision under the same load was less than that of the VPP, but the impact time is reversed, indicating that the impact acceleration of the RPP bumper is more modest, which is more advantageous in pedestrian protection. In addition, the mechanical properties of materials are analyzed in order to investigate the reasons for the variation in test. The yield elongation of the VPP material is lower than that of the RPP (35%) and the impact strength and energy absorption are slightly great. This allows the RPP bumper skin to generate the same deformation with less force (less impact acceleration). The performance of RPP bumpers is close VPP due to the advantage of additives of RPP and the greater melt fluidity.
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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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