Stability Analysis of Different Stiffened Plates in Thermal-Mechanical Coupling Environments

热力耦合下不同加筋壁板稳定性分析

¹ School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
² Aircraft Strength Research Institute, Xi'an 710072, China

Received: 19 March 2019

Abstract

In view of the structural stability problem of different typical stiffened panels under different loading conditions, ABAQUS software was used to build finite element models of four typical stiffened panels with the same cross section area. The buckling and post-buckling response of the stiffened panels was analyzed and buckling modes and deflection curves of stiffened panels under mechanical, temperature and thermal-mechanical coupling load were obtained. The result indicates that T type stiffened plate shows great stability under mechanical load, the maximum load is 281KN, which is much higher than that of other types of stiffened panels. The maximum load of a stiffened panel is little affected by the direction of the fillet, but reasonable layout of panels can greatly reduce the out-of-plane displacement of the stiffened panel. There is no obvious pre-buckling process when a panel is under thermal-mechanical coupling load and the post-buckling response is roughly similar as that under mechanical load. But the maximum load of a stiffened plate will decrease by 8%-15% due to the application of temperature load.

摘要

针对飞行器不同加筋壁板在不同载荷工况下的结构稳定性问题，采用Abaqus有限元分析软件，建立了长度和宽度相同的4种加筋壁板有限元数值分析模型。通过对加筋壁板的屈曲和后屈曲响应分析，给出不同筋条截面形式和布局方向的加筋板在机械载荷、温度载荷以及热力耦合下的屈曲模态和挠度曲线。结果表明：T型加筋板在机械载荷作用下表现出良好的稳定性，最大承受载荷为281 kN，远大于其他截面形式的加筋板；筋条布局方向对加筋板的承载能力影响很小，但是合理的布局能够大幅减小加筋壁板的面外位移；热力耦合下加筋板没有明显的前屈曲过程，其后屈曲响应与机械载荷作用下时大致相同，但是加筋板的最大承载能力会由于温度载荷的存在而减小8%~15%。