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| 汽车薄壁保险杠蒙皮材料特性分析与服役性能研究 |
| Material Characteristics and Service Performance of Automobile Thin-walled Bumper Skin |
| Received:April 17, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.06.004 |
| 中文关键词: 薄壁设计 汽车保险杠蒙皮 联合仿真 服役性能 |
| 英文关键词: thin-walled design bumper skin co-simulation service performance |
| 基金项目:广西重点研发计划(AB23026112);广西新能源重点实验室项目(2023AA04007) |
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| 中文摘要: |
| 目的 优化薄壁保险杠蒙皮材料的力学性能，评价薄壁保险杠蒙皮的服役性能。方法 以纳米碳酸钙(nano-CaCO3)、蒙脱土(MMT)和氢化苯乙烯-丁二烯嵌段共聚物(SEBS)为添加剂对PP进行协同改性。采用双螺杆挤压机制备PP/SEBS/nano-CaCO3和PP/SEBS/MMT共混材料，研究刚性粒子与SEBS对薄壁注塑用聚丙烯(PP)的强韧协同效应。研究无机填料/弹性体协同改性作用对薄壁注塑用聚丙烯结晶行为、力学性能与微观结构的影响规律。建立薄壁注塑用聚丙烯保险杠蒙皮有限元仿真模型，通过多个工况有限元仿真和实验来评价薄壁保险杠蒙皮的服役性能。结果 共混材料的结晶度相比PP/SEBS提高了1.2%~7.3%，结晶温度未产生显著变化;nano-CaCO3质量分数为4%的PP/SEBS/nano-CaCO3综合性能最好。仿真结果表明，薄壁保险杠蒙皮具有较好的服役性能，并且通过实验验证了该评价方法的有效性。结论 薄壁保险杠蒙皮材料可以通过共混改性达到理想的刚韧平衡效果，基于材料性能-成形质量-服役性能的方法为高效设计薄壁汽车保险杠蒙皮提供了新途径。 |
| 英文摘要: |
| The work aims to optimize the mechanical properties of thin-walled bumper skin materials and evaluate the service performance of thin-walled bumper skin. PP was modified synergistically with nano-CaCO3, montmorillonite (MMT) and hydrogenated styrene-butadiene block copolymer (SEBS) as additives. PP/SEBS/nano-CaCO3 and PP/SEBS/MMT blends were prepared by twin-screw extruder. The synergistic effect of rigid particles and SEBS on the strength and toughness of polypropylene (PP) for thin-walled injection molding was studied. The effects of inorganic filler/elastomer synergistic modification on the crystallization behavior, mechanical properties and microstructure of polypropylene for thin-walled injection molding were investigated. The finite element simulation model of polypropylene bumper skin for thin-walled injection molding was established, and the service performance of thin-walled bumper skin was evaluated by finite element simulation and experiment under multiple working conditions. The crystallinity of the blends increased by 1.2%-7.3% compared with that of PP/SEBS, and the crystallization temperature did not change significantly. The comprehensive performance of PP/SEBS/nano-CaCO3 with 4% nano-CaCO3 was the best. The simulation results showed that the thin-walled bumper skin had good service performance, and the effectiveness of the evaluation method was verified by experiments. The thin-walled bumper skin material can achieve the ideal balance of rigidity and toughness through blending modification. The method based on material properties-molding quality-service performance provides a new way for the efficient design of thin-walled automobile bumper skin. |
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