衝撃圧縮開始時刻と計測応力波の立上り開始時刻との関係 : 数値計算による分割ホプキンソン棒圧縮法の標準化に関する研究 1 [in Japanese] Relationship between Commencement Time of Impact Compression and Commencement Time of Observed Stress Pulses : Study of Standardization of Impact Compression Test by Split Hopkinson Pressure Bar Technique with the Aid of Numerical Simulation 1 [in Japanese]
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The split Hopkinson pressure bar test is numerically simulated, in which the assumed mechanical property of the specimen is compared with that calculated from the stress waves in incident and transmitted bars. The method of processing the stress waves in the bars is investigated to improve the accuracy of the stress-strain curve. The stress-strain curve of the specimen depends on how one determines the commencement time of stress pulse in the elastic bars. When the commencement time of stress pulse is determined using an appropriate threshold value of stress, both the elastic and plastic properties are close to the assumed ones. On the other hand, when the commencement time of stress pulse is determined by the speed of elastic wave propagation, the elastic modulus is considerably underestimated. Considering that both the elastic and plastic behaviors are well described quantitatively, the method using the threshold value of stress in determining the commencement time of stress pulse could be suitable for obtaining more accurate stress-strain curve.
- Journal of the JSTP
Journal of the JSTP 48(558), 635-639, 2007-07-25
The Japan Society for Technology of Plasticity