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Thermal buckling and dynamic characteristics of composite plates under pressure load
Journal of Mechanical Science and Technology ( IF 1.6 ) Pub Date : 2020-08-07 , DOI: 10.1007/s12206-020-0702-6
Xuan Yang , Qingguo Fei , Shaoqing Wu , Yanbin Li

The effect of geometrical nonlinearities due to pressure load on the thermal buckling and dynamic characteristics of composite plates are investigated in this paper, which is the main contribution of this research work. The mechanical behavior of the plate is described with the first-order shear deformation theory. The geometrical nonlinearity due to both thermal effect and pressure load is introduced in the finite element model of the plate via additional stiffness matrices. Thermal buckling and modal analysis of a four-sided simply supported rectangular composite plate under different pressure fields are conducted. Numerical results show that both the mode frequencies and critical buckling temperature of the plate rise with the increase of the pressure. The vibrational mode shapes change with the gradient pressure load field. The maximum buckled deflection point moves from the center to the place where is easier to reach compressive stress state under uniform thermal load. The pressure distribution has a significant effect on the buckling mode shapes of the plate.



中文翻译:

压力载荷下复合板的热屈曲和动力特性

本文研究了压力载荷引起的几何非线性对复合板热屈曲和动力学特性的影响,这是本研究的主要贡献。用一阶剪切变形理论描述了板的力学行为。通过附加的刚度矩阵,在板的有限元模型中引入了由于热效应和压力载荷而引起的几何非线性。进行了在不同压力场下四边简支矩形复合板的热屈曲和模态分析。数值结果表明,模态频率和临界屈曲温度均随压力的增加而升高。振动模式形状随梯度压力载荷场而变化。最大弯曲挠曲点从中心移动到在均匀热负荷下更容易达到压应力状态的位置。压力分布对板的屈曲模式形状有重要影响。

更新日期:2020-08-08
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