1701 衝撃力を受けた構造材の力学特性変化に関する基礎研究(J22-1 衝撃破壊と安全性評価,J22 産業化および安全のための新技術)

概要

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The knowledge of mechanical property changes for materials and structures after the transmission of strong shocks is of great importance in safety evaluation for accidental impact phenomena. In this study, explosively shocked plate specimens of aluminum A2017-T4 were successfully recovered without a large amount of damages due to the reflected expansion waves using momentum trap method. The transmitted shock waves were generated by the plane detonation waves in the high explosive PETN initiated using wire-explosion techniques. Two-dimensional hydro code, Autodyn-2D was applied to simulate the time-histories of stress waves in the specimens in order to determine the test conditions, thicknesses of explosive PETN, specimens and momentum traps and evaluate the experimental results. Micro Vickers hardness distributions in cross-sections were measured for recovered shocked specimens and compared with those of virgin specimen, showing significant increase of hardness for shocked specimens. Furthermore the recovered shocked specimens were machined to miniature tensile specimens of 2mm diameter and tensile tests are in progress, and a preliminary test result has indicated remarkable reduction of elongation and ductility for the shocked specimen.
一般社団法人日本機械学会の論文
2006-09-15