跨厚比对碳纤维复合材料三点弯曲性能的影响

Influence of span-to-thickness ratio on the three-point bending behavior of carbon fiber composites

本文分别以日本东丽T700SC、T1100G碳纤维为增强体,自制树脂体系为基体,采用模压工艺制备了单向碳纤维复合材料层合板。分别研究了两种复合材料层合板在跨厚比为16∶1、32∶1、40∶1、50∶1时三点弯曲强度的变化规律,并着重分析了对应的弯曲破坏模式。结果表明:T700、T1100碳纤维复合材料的三点弯曲最佳跨厚比分别为32∶1和40∶1,对应的破坏模式均为上表面压缩和分层破坏。在32∶1的标准跨厚比下,T1100碳纤维复合材料层合板的弯曲强度为1 779.87 MPa,仅比T700碳纤维复合材料层合板高2.61%。

Herein, we have utilized T700SC and T1100G carbon fibers from Toray(Japan) as reinforcement and self-prepared resin system as matrix to fabricate the unidirectional carbon fiber composite laminates through molding method. The variation of three-point bending strength of two kinds of composite laminates containing different span-to-thickness ratios of 16∶1, 32∶1, 40∶1 and 50∶1 was studied respectively. Meanwhile the bending failure modes of the corresponding composite laminates are analyzed. Our results indicate that at the span-to-thickness ratios of 32∶1 and 40∶1, both T700 and T1100 carbon fiber composites achieve the highest bending strength, with the common failure modes of the upper surface compression and delamination. At the standard span-to-thickness ratio of 32∶1, the bending strength of T1100 carbon fiber composites is up to 1 779.87 MPa, only 2.61% higher than that of T700 composites.