无人机结构复合材料在海洋环境下的强度退化研究

Research on Strength Degradation of UAV Structural Composites Material in Marine Environment

为了探究无人机结构复合材料在海洋环境下的力学性能,设计了为期60 d的加速老化试验。将试样浸入60℃的人造海水中进行加速老化试验以及力学试验;采用两种经验模型预测复合材料强度退化过程,确定材料强度随老化时间和吸湿率的变化;利用扫描电子显微镜(SEM)对失效试样的微观结构进行观察分析。结果表明:无人机结构复合材料的拉伸、压缩和弯曲试样的饱和吸湿率有不同程度上升,强度有不同程度下降。复合材料长期暴露在老化环境中,基体老化和纤维/基体界面脱黏会导致材料强度下降。

In order to explore the mechanical properties of the UAV structural composite material in the marine environment,a 60 day accelerated aging test was designed.The specimens were immersed in artificial seawater at 60℃for accelerated aging test and mechanical test.Two empirical models were used to predict the strength degradation process of composite materials,and the change of material strength with aging time and moisture absorption rate was determined.The microstructure of the failed specimens was observed and analyzed.The results showed that the saturated moisture absorption rate of the tensile,compressive and bending specimens increases to different degrees,and the strength decreases to different degrees.After long term exposure to the aging environment,the aging of the matrix and the debonding of the fiber/matrix interface will lead to a decrease in the strength of the composite material.