湿热老化对T700/3234复合材料力学性能影响研究

Study on Hydrothermal Aging Effect on Mechanical Properties of T700/3234 Composites

在室温及70℃条件下对单向T700/3234复合材料进行了湿热老化试验,分别测试了经历不同吸湿时间后材料的吸湿率、层间剪切强度和弯曲强度,并且利用扫描电镜(SEM)对力学性能试样的断口形貌进行了分析。结果表明,吸湿温度越高,饱和吸湿率越高。T700/3234复合材料具有良好的耐湿热性能,其层间剪切强度、弯曲强度保持率分别为69.33%和76.06%。吸湿使界面出现一定程度的脱粘是导致其力学性能下降的主要原因。

The moisture absorption rate, interlaminar shear strength and bending strength of unidirectional T700/3234 composites with different aging time through hydrothermal aging tests under room temperature and 70℃ are tested, and the fractographs of the samples are analyzed with SEM. The results indicate that the saturation moisture absorption rate increases with the improving temperature. The T700/3234 composites show good moisture resistance, and the retention of interlaminar shear strength and bending strength are 69.33% and 76.06%, respectively. Fibermatrix de-bonding caused by moisture absorption is the main reason of the decrease in the mechanical properties.