高温环境作用下T800碳纤维/AC631双马来酰亚胺复合材料的疲劳行为  

Effect of High Temperature Aging on the Fatigue Properties of T800 Carbon Fiber/AC631 BMI Composites

作　　者：高禹 杨晓东 董尚利[2] 王柏臣 包建文 Yu Gao;Xiaodong Yang;Shangli Dong;Baichen Wang;Jianwen Bao(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;National Key Laboratory of Advanced Composites,Beijing 100095,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [3]先进复合材料国防科技重点实验室,北京100095

出　　处：《高分子材料科学与工程》2022年第3期89-95,共7页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51373102);辽宁省教育厅科学研究经费项目(JYT2020008)。

摘　　要：在200℃高温环境下对多向铺层T800/AC631双马来酰亚胺复合材料进行了长时间暴露处理,测试了复合材料的质损率、动态力学性能和拉伸强度。根据拉伸强度确定疲劳应力水平,并测试了高温环境处理前后材料的疲劳性能。采用宏观目视和超声C扫描对复合材料疲劳损伤状况进行了表征和分析。结果表明,随着高温环境处理时间的延长,复合材料的质损率先迅速增加再缓慢增加。复合材料动态力学性能的变化归因于高温环境处理后的复合材料发生了一定程度的后固化、物理老化和界面局部脱粘。高温环境处理1000 h后,复合材料出现了轻微损伤,其疲劳寿命与原始态相比明显下降。复合材料的疲劳破坏模式主要为纤维断裂和铺层分层开裂。经历高温环境处理的T800/AC631复合材料的刚度明显下降,迟滞回能环轴线斜率和面积减少,表明复合材料出现了明显的高温老化损伤。The multi-directional laminate T800/AC631 composite material was exposed for a long time under a high temperature environment of 200℃,and the mass loss rate,dynamic mechanical properties(DMA)and tensile strength of the composite material were tested.The fatigue stress level was determined according to the tensile strength,and the fatigue performance of the material before and after the high temperature environment treatment was tested.Macroscopic visual inspection and ultrasonic C-scan were used to characterize and analyze the fatigue damage of the composite material.The results show that with the increase in the treatment time under the high temperature environment,the mass loss of the composite material first increases rapidly and then increases slowly.The changes in the dynamic mechanical properties of the composite material are attributed to a certain degree of post-curing,physical aging and local interface debonding in the composite material treated in a high-temperature environment.The T800/AC631 composite material is slightly damaged after being treated under a high-temperature environment for 1000 h,and its fatigue life is significantly reduced compared with the original state.The fatigue failure modes of the composite material are mainly fiber fracture and layer delamination.The stiffness of the T800/AC631 composite material that has undergone high-temperature environmental treatment is significantly reduced,and the slope and area of the axis of the hysteretic energy loop are reduced,which indicates that the composite material has obvious high temperature aging damage.

关 键 词：碳/树脂基复合材料 高温环境 疲劳性能 动态力学热分析 超声C扫描 

分 类 号：TB332[一般工业技术—材料科学与工程]