面内载荷下复合材料帽型加筋板结构稳定性分析

Analysis of structural stability for composite hat-stiffened plane under in-plane compression loads

为探究复合材料帽型加筋板结构稳定性问题,首先根据层合板理论和等效刚度法,通过分析边界条件得出复合材料帽型加筋板在面内压载作用下局部失稳的特征方程;然后,引入算例进行了数值计算,定量分析了结构参数变化对帽型加筋板临界载荷和屈曲模态的影响规律;最后,结合算例进行了相应的试验分析,试验结果和计算结果吻合较好。分析表明:帽型加筋板在面内压载作用下优先发生局部失稳,通过合理设计帽型筋条可有效避免结构整体失效。该研究结果对工程结构设计应用具有一定的理论参考价值。

In order to explore the stability issues of composite hat-stiffened plane,firstly,according to the layered plate theory and equivalent stiffness method,the characteristic equation of local instability for composite hat-stiffened plane subject to in-plane compression load was derived by analyzing the boundary conditions.And then,an example was given for numerical calculation,whereby the influence of structural parameters on the critical load and buckling mode of stiffened plates was analyzed quantitatively.Finally,in combination with the calculation example,the corresponding test analysis was carried out,and the test results were in good agreement with the calculation results.Analysis shows that local buckling of stiffened plates is preferentially occurred under in-plane compression loads,and that the overall failure of the structure can be effectively avoided by reasonable design of the hap stiffener.The research results have a certain theoretical reference value for the application of engineering structure design.