FRP夹强化泡沫芯复合材料的力学性能

摘要

In this article, mechanical properties of a new type of foam-core sandwich composites are studied. The core was made by inserting thin-walled circular tubes into a PU foam, resulting in a significant reinforcement in its Z-directional properties. The sandwich composites were further fabricated by using FRP (fiber reinforced plastic) panels as surfaces and the strengthened foam as core. Lateral compression, three- point bending and shear tests were carried out for the sandwich composites. Failure mechanisms were analyzed based on fracture modes observed. Theoretical predictions for compression and bending moduli were carried out. The results show that the sandwich materials developed can significantly improve Z-directional mechanical properties, and have a good application prospect.%本文研究一种新型强化泡沫芯夹层复合材料的力学性能。选择在低成本的PU泡沫中置入圆管状结构增强体，使泡沫芯的等效Z向性能大幅提高。对以FRP面板夹这种强化泡沫芯制成的三明治复合材料结构，进行了平压试验、三点弯曲试验和剪切试验，基于其结构破坏模式，分析其破坏机理，并应用三维层板理论和细观力学方法进行了理论模拟。结果表明，这种强化泡沫芯能显著提高三明治板材的Z向力学性能，具有良好的应用前景。