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针对任意铺层形式和任意壁厚复合材料圆形层合管件,提出一种等效抗弯刚度的计算方法。此方法采用符合复合材料圆形管件梁真实变形的变形理论,考虑横向剪切变形,非均匀扭转效应,主、次挠曲效应和层合材料的三维弹性效应,按照壳壁中实际应力状态,建立了复合材料圆形管件等效抗弯刚度的计算模型。通过与4种铺层管件的三点弯曲实验结果以及经典层合板理论计算的等效抗弯刚度进行对比,验证了计算模型的正确性。通过退化与各向同性材料抗弯刚度的计算方法进行对比,分析了计算模型的适用性。
Aiming at any kind of circular laminated pipe fittings with arbitrary thickness and arbitrary wall thickness, a method of calculating the equivalent bending stiffness is proposed. In this method, the deformation theory, which is in accordance with the true deformation of a circular pipe beam with a composite material, is adopted and the transverse shear deformation, the non-uniform torsional effect, the primary and secondary flexural effects and the three-dimensional elastic effect of the laminated material are considered. According to the actual stress state in the shell wall, The calculation model of equivalent bending stiffness of circular pipe fittings with composite materials is established. The correctness of the calculation model is verified by comparing the three-point bending test results of the four kinds of ply pipes and the equivalent bending rigidity calculated by the classical laminates theory. By comparing the calculation method of the bending stiffness of the isotropic and isotropic materials, the applicability of the calculation model is analyzed.