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首页> 外文会议>Third International Conference on Coupled Instabilities in Metal Structures CIMS'2000, 3rd, Sep 21-23, 2000, Lisbon-Portugal >BUCKLING OF THIN CYLINDRICAL SHELLS UNDER LATERAL PRESSURE: INFLUENCE OF LOCALISED THICKNESS VARIATION
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BUCKLING OF THIN CYLINDRICAL SHELLS UNDER LATERAL PRESSURE: INFLUENCE OF LOCALISED THICKNESS VARIATION

机译：薄壁圆柱壳在侧向压力作用下的屈曲：局部厚度变化的影响

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Aggressive environments can provoke corrosion of thin cylindrical shells widely used in different engineering applications. This work treats the influence of thickness imperfections on buckling of cylindrical shells under hydrostatic pressure. An experimental setup permitting buckling analysis under pressure up to 16 MPa was built up. The specimens were pressurised in a test chamber by oil pressure under quasi-dispiacement controlled conditions. Parameters that were surveyed include shell geometry and thickness distribution. Localised thickness imperfections were induced by electroerosion. A numerical analysis methodology, together with the formulation of one finite element permitting to analyse circumferential and axial distribution of geometrical and thickness imperfections was performed. Two parametric studies treating modal and localised thickness imperfections as well as their coupling with geometrical ones were realised. In the case of modal imperfections two imperfection modes appeared to be the most detrimental; the mode 1 imperfection and the mode 2n imperfection, where n is the linear bifurcation mode of the perfect shell with nominal thickness. Thickness variation in these cases was taken to be symmetrical to the shell's mid surface. With each of the analyses an analytical numerical study for the infinitely long cylinder under external pressure is done as well. Localised thickness imperfections at the external surface of the shell are also presented. For each of these two parametrical analyses an estimate of the buckling load reduction is established as a function of the BATDORF Z parameter. The domain of the imperfection parameters variation for validating the proposed estimate using experimental analysis is given. The presentation of experimental methodology is given. Interpretations and numerical validations of the performed tests are given as well. Finally the buckling load estimate is compared with the test results.
机译：恶劣的环境会引起广泛用于不同工程应用中的薄圆柱壳的腐蚀。这项工作处理了厚度缺陷对静水压作用下圆柱壳屈曲的影响。建立了允许在高达16 MPa的压力下进行屈曲分析的实验装置。在准位移控制的条件下，通过油压将样品在测试室中加压。被调查的参数包括壳的几何形状和厚度分布。电蚀引起局部厚度缺陷。进行了一种数值分析方法，以及一个允许分析几何和厚度缺陷的周向和轴向分布的有限元公式。实现了两个对模态和局部厚度缺陷以及它们与几何缺陷的结合的参数研究。在模态缺陷的情况下，两种缺陷模式似乎是最有害的。模1缺陷和模2n缺陷，其中n是标称厚度的理想壳体的线性分叉模。在这种情况下，厚度变化被认为与壳体的中表面对称。通过每个分析，还完成了在外部压力下无限长圆柱体的分析数值研究。还介绍了外壳外表面的局部厚度缺陷。对于这两个参数分析中的每一个，都根据BATDORF Z参数确定了屈曲载荷减少量的估计值。给出了使用实验分析来验证所提出的估计的缺陷参数变化范围。给出了实验方法的介绍。还给出了所执行测试的解释和数值验证。最后，将屈曲载荷估算值与测试结果进行比较。

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