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首页> 外文期刊>Composite Structures >Thermal postbuckling behavior of 3D braided beams with initial geometric imperfection under different type temperature distributions
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Thermal postbuckling behavior of 3D braided beams with initial geometric imperfection under different type temperature distributions

机译：不同类型温度分布下具有初始几何缺陷的3D编织梁的热屈曲行为

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摘要

Thermal postbuckling analysis for 3D (three-dimension) braided beams to initial geometrical imperfection in general modes subjected to uniform, linear and non-linear temperature distribution through the thickness are presented. The cross-section of 3D braided composite beam may be treated as a cell system and the geometry of each cell is deeply dependent on its position. A generic imperfection function for one-dimensional composite beam is introduced to model various possible initial geometrical imperfection including sine type, local type, and global type imperfections. Based on first-order shear deformation beam theory incorporating von Karman nonlinear strain displacement relations, the governing equation is nonlinear integral-differential equations. An analytical solution for thermal postbuckling of 3D braided beams with and without imperfection obtained as a function of the applied thermal load is employed to determine buckling temperatures and postbuckling equilibrium paths of 3D braided beams. The results reveal that the temperature dependent properties, temperature distribution, geometric parameter, fiber volume fraction, initial geometrical imperfections and braiding angle have a significant effect on thermal postbuckling behavior of braided composite beams.
机译：提出了在3D（三维）编织梁在初始模式下对初始几何缺陷进行热后屈曲分析的一般模式，该模式在整个厚度范围内受到均匀，线性和非线性温度分布的影响。 3D编织复合梁的横截面可被视为单元系统，每个单元的几何形状在很大程度上取决于其位置。引入了用于一维复合梁的通用缺陷函数，以对各种可能的初始几何缺陷进行建模，包括正弦类型，局部类型和整体类型的缺陷。基于一阶剪切变形梁理论并结合了von Karman非线性应变位移关系，控制方程为非线性积分微分方程。使用具有和不具有作为施加的热负荷的函数的缺陷的3D编织梁的热后屈曲的解析解决方案，来确定3D编织梁的屈曲温度和后屈曲平衡路径。结果表明，温度依赖性，温度分布，几何参数，纤维体积分数，初始几何缺陷和编织角对编织复合梁的热后屈曲性能有显着影响。

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