2325 CAEに適したボルト簡易モデル化手法と強度評価法(J09-2 接着・接合,溶接,J09 締結・接合部の力学・プロセスと信頼性評価)

概要

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We developed a simplified model of a bolt jointed structure that uses shell and beam elements and takes into account the stiffness of the structure's jointed plates. The stiffness of an engineering structure with joints depends not only on the materials and dimensions of the structure but also on the stiffness of the fasteners that connect its components. To evaluate the mechanical behavior of a complex structure with many bolted joints using computer-aided engineering (CAE), it is necessary to develop a simple finite element (FE) modeling technique that accounts for the effect of joints on stiffness. In our technique, the stiffness of beam elements was calculated taking into consideration the stiffness of the jointed plates and bolts for each joint. We set an equivalent pressure area on the bearing surface region and, using constraint equations, connect the nodes in the equivalent pressure area to the beam element as rigid regions. We measured the eigenvalues of test pieces and calculated them for the same test pieces using FE analysis. The calculated eigenvalues agreed well with the experimental results, meaning that our model was accurate.
2007-09-07