Abstract
The final goal of this study is to apply the shock absorber utilizing plastic deformation of aluminum tube to elevator buffer. First, in order to study characteristics of axialty crushed tubes, various aluminum tubes were compressed on two types of plane and conical dies. As a result, these caused the two modes of progressive. bucking and inversion. It is concluded that the load-displacement curve of the inversion mode has ideal shape as shock absorber and the inversion load depends on the thickness of the tube. A theoretical expression to calculate the inversion load is derived from the virtual work theorem, the prediction of which agrees well with experimental and FEM results. Secondly, the adjustability of the inversion mode for elevator buffer is discussed Reproducibility of the inversion mode and effect of interference fit for earth quake-proof a presented. Moreover, anti-Euler buckling is discussed for long-stroke absorber. Finally, dynamic response of an elevator system with the inversion mode absorber was simulated by FEM, the result of which confirms that this absorber is able to satisfy specification of the buffer.
