軸圧縮荷重を受ける薄肉円筒のひずみ集中

概要

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In this paper, elastoplastic post-buckling behavior of cylindrical tubes under axial compression is studied by using finite element method. In particular, the effects of tube geometries and strain hardening characteristics on the high strain concentration in circumferential direction ε_θ which arises at the vertex of outward wrinkles are investigated. It is found that the maximum value of ε_θ is dependent on the thickness-to-radius ratio t/R, and independent of the length-to-radius ratio L/R and the nondimensional hardening coefficient E_h/E. Moreover, based on our results we propose an approximation to evaluate the maximum strain ε_<θmax> by using the deformed shape of tubes. This approximation can be used to estimate the experimental results of ε_<θmax> with a good accuracy.
一般社団法人日本機械学会の論文
2005-07-25