论文部分内容阅读
提出一种复合材料薄壁圆柱壳轴压局部屈曲承载力计算模型。在梁弯曲变形平截面假定和小变形假定的基础上,提出复合材料层合梁抗弯刚度的计算方法;根据轴压下圆柱壳的几何对称性及受力对称性,将圆柱壳局部屈曲问题转化为轴向和环向壳带的弯曲变形问题。依据薄壳稳定理论,建立弹性基础上纵向壳带局部屈曲模型,得到了复合材料圆柱壳屈曲承载力解析公式。理论计算公式与经验工程计算公式相比,具有形式上的相似性,且得到的计算系数可直接求出,而非经验范围选取。对三种铺层的复合材料薄壁圆柱壳进行了轴压试验,结合文献试验数据对比,试验结果与理论预测值基本一致,满足工程精度要求,验证了模型的正确性。
A local buckling bearing capacity calculation model of composite thin-walled cylindrical shell under axial load is proposed. Based on the assumptions of plane deformation and the assumption of small deformation of beam, the calculation method of flexural rigidity of composite laminated beam is proposed. According to the geometric symmetry and stress symmetry of cylindrical shell under axial compression, the local buckling problem of cylindrical shell is transformed into Axial and circumferential belt bending deformation problems. According to the theory of shell stability, the local buckling model of longitudinal shell with elastic foundation is established, and the analytical formula of buckling capacity of composite cylindrical shell is obtained. Compared with the empirical engineering calculation formula, the theoretical calculation formula has the formal similarity, and the calculated calculation coefficient can be directly obtained, not the empirical range selection. The axial compressive tests of the three kinds of composite thin-walled cylindrical shells were carried out. According to the comparison of the experimental data and the experimental results, the experimental results were basically consistent with the theoretical predictions. The accuracy of the model was verified and the correctness of the model was verified.