碳纤维复丝压缩性能测试方法

为准确测试碳纤维(CF)的压缩性能,针对浸胶固化的碳纤维复丝,设计了制样方法和测试夹具,建立了碳纤维复丝压缩性能测试方法。采用所建立方法对东丽T700SC等碳纤维进行压缩性能测试,研究了制样条件、测试条件及材料种类对碳纤维复丝压缩强度及破坏模式的影响,考察因素主要包括复丝胶含量、复丝浸胶固化的张力、预加载、测试段长度及树脂基体和纤维种类。结果表明:所建立的方法操作简单,测试结果分散性小;除预加载以外,所考察因素对测试过程及结果具有明显影响;当试样含胶量为30%~35%(树脂质量百分含量)、复丝浸胶的张力为10~15N、测试段长度为1.5mm时,环氧树脂浸渍固化的T700SC碳纤维复丝压缩强度测试结果最高,优化的测试条件对所考察的其他种类碳纤维复丝的压缩强度测试也适用;树脂的种类对复丝压缩强度有显著影响。

Measuring method for compression property of carbon fiber multifilament

In order to accurately test the compression property of carbon fiber (CF), sample preparation method and test fixture were designed based on carbon fiber multifilament with impregnation curing, and a measuring method for compression property of carbon fiber multifilament was established. The compression properties of Toray T700SC and other carbon fibers were tested using the established method. The influences of sample preparation conditions, test conditions and material type on compression strength and failure mode of carbon fiber multifilament were investigated. The considered factors include resin content of multifilament, tension of multifilament during impregnation curing, pre-loading, testing length, resin matrix and fiber types. The results show that the established method is easy operation and has low dispersibility of test results. Except pre-loading, other factors have obvious effects on the testing process and result. For 30%-35% resin content of sample(mass percent of resin), 10-15 N tension of multifilament impregnation, and 1.5 mm testing length, epoxy impregnated curing T700SC carbon fiber multifilament has the highest testing result of compression strength, and the optimized test conditions are also applicable to the compression strength test of other kinds of carbon fiber multifilament. The type of resin has significant impact on the compression strength of multifilament.