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相较于传统的层合板复合材料，三维复合材料具有更高的比强度和损伤容限，其抗冲击性能和整体性更优。然而在实际应用中，制品会受到多次低速冲击载荷的影响，导致内部损伤。因此，设计三维正交玻璃纤维/聚丙烯纤维(GF/PP)混纺纱织物增强环氧基复合材料多次冲击的试验，通过分析多次冲击响应和观察损伤形貌，揭示不同冲击载荷下复合材料的力学响应规律、主要损伤机制及损伤模式。对预先热处理试样的损伤机制和形貌进行了分析，得到聚丙烯(PP)纤维在复合材料冲击中的作用机制。研究表明：热处理使聚丙烯纤维熔化并重新结晶，改变了其体积和形态，从而提高了环氧基复合材料的韧性。随着冲击能量的增加，首次冲击峰值力增大。试样在连续三次25 J能量冲击后，峰值载荷显著下降，最大变形量大约增加至首次冲击的1.2倍。在9 J能量下，随着冲击次数的累积，复合材料的损伤模式种类增多，吸能能力也随之增强。
Abstract：Compared with the traditional laminated composite, three-dimensional composites have higher specific strength and damage tolerance, and have good impact resistance and overall integrity. However, in practical application, the product is inevitably subjected to multiple low-velocity impact loads, resulting in some internal damage. Therefore, the three-dimensional orthogonal glass fiber/polypropylene fiber(GF/PP) blended yarn fabric-reinforced epoxy composites were designed for multiple impact tests. By analyzing the response of multiple impact response law and observing the damage morphology, the mechanical response characteristics, main damage mechanism, and damage modes of composites impacted multiple times under different impact loads are revealed. At the same time, the damage mechanism and morphology of the pre-heat-treated samples were analyzed to obtain the role of PP fiber in the impact behavior of composites. It is shown that heat treatment melts and recrystallizes the polypropylene fibers, changes their volume and morphology, thereby enhancing the toughness of epoxy composites. As the impact energy increases, the peak force of the first impact increases. After the specimen was subjected to three consecutive 25 J energy impacts, the peak load decreased significantly, and the maximum deformation increased to approximately 1.2 times that of the first impact. With the accumulation of the number of impacts at 9 J energy, the variety of damage modes of composites increased, and the energy absorption capacity was also enhanced.
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基本信息:
DOI：10.19886/j.cnki.dhdz.2024.0405
中图分类号:TB332
引用信息:
[1]赵勤勤,石琳,吴震宇等.三维正交玻璃纤维/聚丙烯纤维混纺纱织物增强环氧基复合材料冲击性能及损伤机制[J].东华大学学报(自然科学版),2025,51(04):106-114.DOI:10.19886/j.cnki.dhdz.2024.0405.
基金信息:
国家自然基金面上项目(52273054)