履歴特性を伴う重ね板ばねの有限要素法解析 : 第1報, はり要素モデルに用いる特殊要素の基本的検討

概要

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When leaf springs are subjected to loads, the contact points between leaves as well as friction forces at those points change complicatedly during loading and unloading process. Accordingly, the load-deflection curve of the springs shows a nonlinear hysteresis. To predict the hysteresis behavior of leaf springs by FEM with beam elements, we propose a special contact element by which the states of the non-contact, sticking contact and slipping contact are handled in a unified manner. The frictional force between the leaves are replaced by the nodal force of the special element. The validity of the contact elememts has been confirmed for beams with a frictional constraint support under loading-unloading process of the axial force and the transverse force at frictional support. With the proposed special element for supported ends of a leaf spring, it has confirmed that FEM with beam elements express well the hysteresis of the load-deflection curve.