検力ブロックを利用した動的負荷試験装置の開発とその応力-ひずみ曲線評価への応用

概要

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A compact dynamic loading device for the strain rate range from 300/s to 1500/s which enables us to measure a long stress pulse without wave disturbance due to wave reflection and interference has been developed and examined. A special load cell mechanism, a stress sensing block, which consists of the small cylindrical knob followed by a relatively large mass block was employed, and the displacement of the specimen was measured by means of the magnetic linear encoder. In this device, the dimension of input and output bar system can be reduced to 1/2 or 1/3 of that of a ordinary split Hopkinson bar device, while the accuracy of the obtained stress-strain curves retains the same level of that obtained by the split Hopkinson bar device. In order to verify the applicability of the device, stress-strain rerations of several fcc, bcc and hcp metals were measured, and their experimental tendencies are discussed.
1996-11-25