Basalt fiber-reinforced polypropylene composites have been widely used in industrial production for lightweight designs owing to their low price, good mechanical properties and environmental friendliness. In this study, the automotive door interior trimming panel composed of basalt fiber (BF) reinforced polypropylene (PP) was prepared by injection molding. The effects of BF on the stiffness of PP automotive door interior trimming panels were studied by experiment and simulation. The indentation test was carried out by digital image correlation (DIC) technology. The finite element simulation (FES) was conducted and the result was compared with that of experiment to verify the accuracy of the FES. Then, the stiffness test and the FES of the automotive door interior trimming panels were implemented to study the effect of basalt fiber on the stiffness of polypropylene. Furthermore, the thickness of the automotive door interior trimming panel was optimized by stiffness simulation. The results showed that the indentation test had a great agreement with the FES results. The addition of BF could effectively improve the stiffness of polypropylene plastic automotive interior panel. The BF-reinforced polypropylene plastic automotive door interior trimming panel with a thickness of 1.0 mm had the same stiffness with polypropylene plastic automotive door interior trimming panel with a thickness of 2.4 mm.

玄武岩纤维增强聚丙烯复合材料以其低廉的价格、良好的力学性能和环境友好性等优点被广泛应用于轻量化设计的工业生产中。在这项研究中，通过注塑成型制备了由玄武岩纤维 (BF) 增强聚丙烯 (PP) 组成的汽车车门内饰板。通过实验和模拟研究了 BF 对 PP 汽车车门内饰板刚度的影响。压痕试验采用数字图像相关（DIC）技术进行。进行了有限元模拟（FES），并将结果与​​实验结果进行了比较，以验证FES的准确性。然后，通过对汽车车门内饰板进行刚度试验和FES，研究玄武岩纤维对聚丙烯刚度的影响。此外，通过刚度模拟优化了汽车车门内饰板的厚度。结果表明，压痕试验与FES结果非常吻合。BF的加入可以有效提高聚丙烯塑料汽车内饰板的挺度。厚度为1.0mm的BF增强聚丙烯塑料汽车门内饰板与厚度为2.4mm的聚丙烯塑料汽车门内饰板具有相同的刚度。结果表明，压痕试验与FES结果非常吻合。BF的加入可以有效提高聚丙烯塑料汽车内饰板的挺度。厚度为1.0mm的BF增强聚丙烯塑料汽车门内饰板与厚度为2.4mm的聚丙烯塑料汽车门内饰板具有相同的刚度。结果表明，压痕试验与FES结果非常吻合。BF的加入可以有效提高聚丙烯塑料汽车内饰板的挺度。厚度为1.0mm的BF增强聚丙烯塑料汽车门内饰板与厚度为2.4mm的聚丙烯塑料汽车门内饰板具有相同的刚度。