湿热环境下复合材料层板压缩性能研究

摘要

The influence of hygrothermal environment on compressive property of woven carbon fiber epoxy resin composite was investigated.Specimens in wet and dry state, manufactured by composite laminates, were tested un-der different temperature.Moisture absorption, compressive property and failure modes were analyzed.The mois-ture absorption tests results indicate that the balance moisture content of the specimens is around 0.88%.After moisture absorption, the specimen surface becomes smooth, but few fibers were pulled out and the failure of inter-face occurs.The experimental results show that the compression property of composite laminate was significantly in-fluenced by hygrothermal environment.The compressive strength of the laminates, dominated by the matrix, are re-duced by the hygrothermal conditions.The retention rate of compressive strength are about 65%on the condition of 130 ℃after moisture absorption.Interfacial properties have a great influence on the compressive failure modes of composite laminate.The side of fracture morphology appeared a phenomenon of delaminating as a result of the sharp decrease of interfacial binding force between fiber and resin under the condition of hygrothermal environment.%采用压缩试验方法研究了湿热环境对机织碳纤维环氧复合材料压缩性能的影响。对干态、湿态复合材料层板进行了不同温度下的压缩试验。分析了该复合材料的吸湿特性、不同湿热环境下的压缩性能及破坏模式。吸湿试验结果表明：机织碳纤维环氧复合材料的平衡吸湿率在0．88％左右。吸湿后试样表面变的较为光滑，存在一些树脂破坏，有少量纤维拔出；并发生了界面破坏。压缩试验结果表明：湿热环境对该复合材料压缩性能的影响较为显著，湿热会降低由基体性能主导的压缩强度，130℃下湿态试样的压缩强度保持率约为65％。纤维与基体的结合强度对压缩破坏模式有重要的影响，湿热条件下由于纤维与基体的结合强度降低，侧面断口出现分层破坏现象。