温湿度对碳纤维复合材料许用值影响的试验研究

Experimental study on the effect of temperature and humidity on the allowable value of carbon fiber composites

基于复合材料结构许用值试验方法,开展了温度与湿度对复合材料结构许用值影响的试验研究。结合ASTM试验标准和充分取样方法,进行不同环境条件下碳纤维复合材料单层0°拉伸、单层0°压缩、单层90°拉伸、单层90°压缩试验,并利用数理统计方法和数据处理方法得到各类试验项目极限应变B基准值,对碳纤维复合材料拉伸性能环境影响系数进行计算分析。试验结果表明:在低温干态(CTD)工作环境下,随着温度和湿度的降低,试件的极限应变变小,拉伸性能变差;在高温湿态(ETW)环境下,随着温度和湿度的提高,试件的极限应变变小,压缩性能变差。碳纤维复合材料拉伸性能环境影响系数均值为1.050,压缩性能环境影响系数均值为1.366。在高温高湿和低温环境下,碳纤维复合材料的力学性能会表现出较大的差异,复合材料性能应充分考虑使用环境的影响。

Based on the allowable value test method of composite structure,the influence of temperature and humidity on the allowable value of composite structure was carried out.Combined with ASTM test standards and adequate sampling methods,the 0° tensile,single-layer 0° compression,single-layer 90° tensile and single-layer 90° compression tests of carbon fiber composites under different environmental conditions were carried out,and the numerical statistical methods and data processing methods were used to give the ultimate strain B benchmark values of various test items,and the environmental impact coefficients of the tensile properties of carbon fiber composites were calculated and analyzed.The test results show that with the decrease of temperature and humidity,the ultimate strain of the specimen becomes smaller,the tensile properties deteriorate,the low-temperature dry state(CTD) is the harsh working environment,in the 0°,90° compression test,with the increase of temperature and humidity,the ultimate strain of the specimen becomes smaller,the compression performance deteriorates,and the high-temperature wet state(ETW) is the harsh environment of work.The average environmental impact coefficient of tensile properties is 1.366 and compressive properties is 1.050.Under high temperature,high humidity,and low temperature environments,the mechanical properties of carbon fiber composite materials will exhibit significant differences.Therefore,the performance of composite materials should fully consider the impact of the usage environment.