纤维稀土镁合金超混杂层板弯曲性能及其失效机理  

Bending properties and failure mechanism of fiber rare earth magnesium alloy super hybrid laminates

作　　者：赵宗 郑兴伟 钱仁飞 汪伟 殷浩浩 ZHAO Zong;ZHENG Xingwei;QIAN Renfei;WANG Wei;YIN Haohao(College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China;College of Science,Donghua University,Shanghai 201620,China;Ningbo Dafa Chemical Fiber Co.Ltd.,Ningbo 315336,Zhejiang,China)

机构地区：[1]上海海洋大学工程学院,上海201306 [2]东华大学理学院,上海201620 [3]宁波大发化纤有限公司,浙江宁波315336

出　　处：《航空材料学报》2021年第4期157-166,共10页Journal of Aeronautical Materials

基　　金：国家自然科学基金(51775329);基础加强计划技术领域基金(2020-JCJQ-JJ-316)。

摘　　要：纤维金属层板主要应用于飞机的机身壁板、机翼蒙皮等关键部位,上述结构件在服役过程中承受较大的弯矩,要求纤维金属层板应当具有抵抗弯曲变形的能力。本工作以新型机身结构材料纤维稀土镁合金超混杂层板为研究对象,采用三点弯曲测试不同跨厚比(L/h)下单向和正交稀土镁合金超混杂层板的弯曲强度,使用SEM观察层板的弯曲破坏形貌,结合有限元仿真分析层板弯曲过程中的渐进损伤行为。研究结果表明:不同的L/h值对稀土镁合金超混杂层板的弯曲强度有一定的影响,单向和正交稀土镁合金超混杂层板有效弯曲破坏L/h值分别为16~22和16~20。通过SEM观察及有限元分析可知,稀土镁合金超混杂层板弯曲破坏模式包括弹性阶段、塑性阶段、纤维及环氧树脂基体断裂阶段以及镁合金断裂、层板分层阶段。The fiber metal laminate is mainly used in the fuselage wall board,wing skin and other key parts of the aircraft.The structural parts mentioned above bear a large bending moment during the service,which requires that the fiber metal laminate should have the ability to resist bending deformation.In this study,fiber rare earth magnesium alloy super hybrid laminate,a new type of fuselage structure material was used as the research object.Three-point bending was used to test the bending strength of unidirectional and cross-ply rare earth magnesium alloy super hybrid laminates under different span-to-thickness ratios(L/h).SEM was used to observe the bending failure morphology of the laminate,and the progressive damage behavior of the laminate during the bending process was analyzed with finite element simulation.The research results show that the different L/h values have a certain effect on the bending strength of rare earth magnesium alloy super hybrid laminates.The effective bending failure L/h values of unidirectional and orthogonal rare earth magnesium alloy super hybrid laminates are 16-22 and 16-20 respectively.Through SEM observation and finite element analysis,it is concluded that the bending failure modes of laminate include elastic stage,plastic stage,fiber and epoxy resin matrix fracture stage,rare earth magnesium alloy fracture stage and laminate delamination stage.

关 键 词：稀土镁合金 纤维金属层板 弯曲性能 失效机理 有限元分析 

分 类 号：TB333[一般工业技术—材料科学与工程]