AN APPROACH FOR CONTROLLING OSCILLATION IN DYNAMIC STRESS-STRAIN MEASUREMENT
(1.Xiangtan Mining Institute, Xiangtan 411201；
2.Central South University of Technology, Changsha 410083)
2.Central South University of Technology, Changsha 410083)
Abstract: The reasons why oscillation exists in the measurement of dynamic stress-strain curves of the SHPB subjected to a rectangular loading wave have been analyzed and a conclusion of that the oscillation can be controlled by the loading stress waveforms was made. Then, the Impact Discrete Inversion Technique proposed by the authors was introduced to design the rams based on expected stress waveforms. The confirmative experimentation results obtained using the designed ram which can produce an approaching sine wave showed that the oscillations were effectively controlled.
Key words: dynamic experiment technique impact stress waveform