摘要
通过理论推导与有限元仿真,研究了湿热环境下一端固支与四端固支约束含分层平面编织玻璃纤维/环氧树脂基复合材料层合板的不同分层夹角及分层位置的振动特性。首先基于Mindlin一阶剪切变形理论与Hamilton原理,考虑湿热应力和质量效应,依据湿度与温度的等效性,推导了受湿热环境影响的含分层层合板的湿热本构方程与固有频率表达式。利用有限元软件ABAQUS自带的用户材料子程序(UMAT)接口,编制相应的接口程序,建立了一系列温湿度组合下的分层损伤模型。并将数值结果与文献中试验值进行了验证。算例结果表明:湿热效应下,分层加剧了湿热环境下平面编织层合板各阶固有频率的下降;不同的分层夹角会引起固有频率值的改变,夹角越大固有频率下降幅值越大;湿度对分层层合板振动特性的影响比温度对分层层合板振动特性的影响显著;湿热效应会引起高阶频率向低阶的漂移,加剧局部共振现象;表面分层与中面分层都会引起各阶固有频率值下降,但下降幅值两者之间差别不大。
Through theoretical derived and finite element simulation,the vibration characteristic of delaminated plain woven fabric glass fiber/epoxy composite laminate with four sides clamped and one side clamped under hygrothermal environment were studied.This paper studies the relationship between delamination angle,delamination location and vibration characteristic.Based on the first order shearing deformation theory of Mindlin and Hamilton principle,the formula of hygrothermal constitutive equation and the natural frequency of laminated plates was derived,considering the hygrothermal stress,mass effect and the equivalence between moisture and temperature.Using user material subroutine(UMAT)interface with the finite element software ABAQUS,the corresponding interface program was compiled and a series of delaminated model under hygrothermal environment were established.It is found that the simulation results are in good agreement with literature experimental value.Results show that delamination makes vibration frequency decrease intensify under hygrothermal environment.Increasing delamination angle can cause the decline of frequency value,and the larger delamination angle,the larger decline frequency.The influence of moisture is more serious than that of temperature on vibration characteristic.The hygrothermal effect can cause the order of the base frequency decline and intensify the local resonance phenomenon.Surface delamination and middle delamination can cause modal change,but there is little difference.
作者
贾宝惠
张刚
蔺越国
卢翔
JIA Baohui;ZHANG Gang;LIN Yueguo;LU Xiang(Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2019年第4期892-904,共13页
Acta Materiae Compositae Sinica
基金
面向民机维修的基础数据研究与应用(MJ-2016-Y-73)
中央高校基本科研业务费(3122016B003)
关键词
含分层平面编织复合材料层合板
分层夹角
分层位置
湿热环境
振动特性
delaminated plain woven fabric glass fiber/epoxy composite laminate
delamination angle
delamination location
hygrothermal environment
vibration characteristic
