复合材料科学与工程DOI:10.19936/j.cnki.2096-8000.20230328.012跨厚比对碳纤维复合材料三点弯曲性能的影响王一超,李鹏*,周菊萍(北京化工大学材料科学与工程学院,北京100029)摘要: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1779.87MPa,仅比T700碳纤维复合材料层合板高2.61%。关键词:复合材料;跨厚比;三点弯曲;破坏模式中图分类号:TB332文献标识码:A文章编号:2096-8000(2023)03-0083-06Influenceofspan-to-thicknessratioonthethree-pointbendingbehaviorofcarbonfibercompositesWANGYichao,LIPeng*,ZHOUJuping(SchoolofMaterialsScienceandEngineering,BeijingUniversityofChemicalTechnology,Beijing100029,China)Abstract:Herein,wehaveutilizedT700SCandT1100GcarbonfibersfromToray(Japan)asreinforcementandself-preparedresinsystemasmatrixtofabricatetheunidirectionalcarbonfibercompositelaminatesthroughmoldingmethod.Thevariationofthree-pointbendingstrengthoftwokindsofcompositelaminatescontainingdiffer-entspan-to-thicknessratiosof16∶1,32∶1,40∶1and50∶1wasstudiedrespectively.Meanwhilethebendingfail-uremodesofthecorrespondingcompositelaminatesareanalyzed.Ourresultsindicatethatatthespan-to-thicknessratiosof32∶1and40∶1,bothT700andT1100carbonfibercompositesachievethehighestbendingstrength,withthecommonfailuremodesoftheuppersurfacecompressionanddelamination.Atthestandardspan-to-thicknessra-tioof32∶1,thebendingstrengthofT1100carbonfibercompositesisupto1779.87MPa,only2.61%higherthanthatofT700composites.Keywords:compositematerials;span-to-thicknessratio;three-pointbending;failuremode收稿日期:2022-02-14作者简介:王一超(1997—),男,硕士研究生,主要从事碳纤维复合材料制备及工艺方面的研究。通讯作者:李鹏(1967—),男,博士,...