段付薄肉円管に対する衝撃圧潰試験および同部材のエネルギー吸収能の評価に関する研究

概要

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To examine axial crushing properties of aluminum alloys under high strain rate deformations, the axial crushing tests of thin-walled circular tube specimens were conducted. Particularly, we introduced a new apparatus, load sensing block, with a special technique based on the theory of stress wave propagation for the dynamically-loaded axial crushing test. It enables us to get stable outputs to illustrate stress-strain curves for a wide strain range even in the case of the specimens with long length in the axial direction or low impedance. In accordance with the split-Hopkinson bar method, the size of device must be extended considerably in those cases. In order to evaluate the energy absorption abilities of those specimens, we paid attention to the absorbed energy density per unit length. The comparison among the modes of dynamic progressive buckling shows that the concertina buckling mode has the largest absorption ability among those modes. The conditions governing those buckling modes are also discussed.
一般社団法人日本機械学会の論文
1999-07-25