安全壳中钢衬壳热屈曲问题理论与实验研究(Ⅱ)──实验部分

钢衬壳热屈曲问题是核工程安全壳设计中的主要问题，但实验研究方面的文章发表得不多文中以200兆瓦核电站安全壳中钢衬壳为研究对象，采用局部1：1模型，测得了钢衬壳热屈曲温度和应变载荷，给出了钢衬壳屈曲和初始后屈曲过程中挠度和温度关系、以及膜应变和温度关系，实验测得钢衬壳具有局域屈曲的现象，实验屈曲载荷与理论结果符合较好

THEORETICAL AND EXPERIMENTAL ANALYSES OF THERMAL BUCKLING PROBLEMS OF LINER SHELLS (II) -EXPERIMENTAL PART

In the present paper, the problem of the axisymmetric postbuckling response has been investigated for thin circular plates and delaminated circular films under the action of inplane compression. Especially, the problem of the asymmetric bifurcation buckling occuring at the stage of the axisymmetric postbuckling deformation has beed investigated for the first time.The regular solutions of the axisymmetric buckling and postbuckling equations are derived by the use of power series expansions, and the solutions of the equations for the second-time bifurcation buckling and postbuckling are obtained by using the Fourier series and the power series simultaneously.The delaminated circular film is treated as a thin circular plate clamped to the substrate along the boundary of the delaminated zone, and the energy release rates corresponding to the two stages of tile postbuckling deformation of the film are calculated.