蜂窝夹层结构弯曲疲劳寿命预测研究  

Bending fatigue life prediction of honeycomb sandwich structures

作　　者：董帆 马伟杰 计浩然 李亚智[1,2] 周春苹 DONG Fan;MA Weijie;JI Haoran;LI Yazhi;ZHOU Chunping(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;National Key Laboratory of Strength and Structural Integrity,Xi’an 710072,China;Aviation Key Lab of Science and Technology on High Performance Electromagnetic Windows,AVIC Research Institute for Special Structures of Aeronautical Composites,Jinan 250104,China;Marine Design&Research Institute of China,Shanghai 200011,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]强度与结构完整性全国重点实验室,西安710072 [3]航空工业济南特种结构研究所高性能电磁窗航空科技重点实验室,济南250104 [4]中国船舶及海洋工程设计研究院,上海200011

出　　处：《航空工程进展》2024年第6期224-234,共11页Advances in Aeronautical Science and Engineering

基　　金：航空工业特种所—西北工业大学电磁功能结构可靠性/维修技术联合实验室开放课题资助项目。

摘　　要：复合材料夹层板兼具轻质高承载特性,但也面临多样的失效模式,深入研究其性能与失效机理,对确保结构安全与效能至关重要。针对一种玻璃纤维/氰酸酯织物层压面板和Nomex蜂窝复合的夹层板,采用特殊设计的试验夹具,开展三点弯曲静力和疲劳试验,分析该夹层板的弯—剪承载特性,观察其疲劳损伤和失效现象;同时,根据夹层板承力特点,对受面内力的面板和受面外剪切的芯材分别建立疲劳损伤模型,借助夹层板等效有限元模型,预测夹层板弯曲疲劳寿命。结果表明:所推荐的预测方法能够合理地反映夹层板弯曲疲劳损伤过程,疲劳寿命预测结果略为保守,与实测寿命误差属于可接受范围。Composite sandwich panels possess the characterizations of lightweight and high load-bearing capacity.They also face diverse failure modes,and an in-depth study of their mechanical performance and failure mechanisms is essential to ensure structural safety and applicability.In this paper,three-point bending static and fatigue tests are carried out for the sandwich panels consist of plain weave glass fiber/cyanate fabric laminate and Nomex honeycomb by using a specially designed test fixture to investigate the bending-shear load capacity and fatigue performance of the panel,and observe the fatigue damage and failure phenomena.According to the internal stress states of the sandwich panel,fatigue damage models are established for the face panels subjected to in-plane stresses and the sandwich core subjected to out-of-plane shear.Substituting the honeycomb core by an equivalent solid finite element,the bending panel is discretized by using the solid finite elements.Then the bending fatigue lives of the sandwich panel are predicted by means of finite element analysis and cumulative fatigue damage analysis.Results show that the simulated bending fatigue performance of the sandwich panel correlate well with the experimental results.The predicted fatigue lives are a little conservative and acceptable.

关 键 词：蜂窝夹层板 弯曲疲劳试验 疲劳损伤模型 有限元建模 寿命预测 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程] TB33[一般工业技术—材料科学与工程]