基于弹性基础梁理论的复合材料薄壁圆柱壳屈曲承载力模型

发布时间：2018-02-11 03:20

本文关键词： 弹性基础梁局部屈曲圆柱薄壳承载力轴压　出处：《复合材料学报》2017年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:A model for calculating the local buckling capacity of composite thin-walled cylindrical shells under axial compression is presented. Based on the assumption of plane section and small deformation of beam bending deformation, the calculation method of flexural stiffness of composite laminated beams is presented. According to the geometric symmetry and force symmetry of cylindrical shells under axial compression, the local buckling problem of cylindrical shells is transformed into the bending deformation problem of axial and toroidal shell belts. Based on the theory of thin shell stability, the local buckling model of longitudinal shell bands on elastic foundation is established. The analytical formula for buckling bearing capacity of composite cylindrical shells is obtained. Compared with empirical engineering formulas, the theoretical formulas are similar in form, and the calculated coefficients can be obtained directly. The axial compression test of three kinds of laminated composite thin walled cylindrical shells is carried out, and the experimental results are in good agreement with the theoretical prediction values, which meet the requirements of engineering accuracy and verify the correctness of the model.
【作者单位】：解放军理工大学野战工程学院;东南大学土木工程学院;昌大建筑科技有限公司;
【基金】：国家自然科学基金(51408606) 国家科技支撑计划(2014BAB15B01-05)
【分类号】：TB33

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