PSI - Issue 60

S.K. Pandey et al. / Procedia Structural Integrity 60 (2024) 665–677 S. K. Pandey/ Structural Integrity Procedia 00 (2023) 000 – 000

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Fig. 6. Effect of length of striker on signal

4.5. Influence of offset of striker and specimen

Offset in the striker with incident bar and specimen with incident and transmission bar cannot be removed completely while doing the experiment. Hence study of offset is essential for the Split-Hopkinson Pressure Bar test. The finite element analysis of offset in striking bar with incident bar has been performed and signal has been plotted in Fig.7. The offset of 0.5 mm, 1 mm and 1.5 mm have been provided in striker. There is no significant change in signal due to offset in striker. The offset of 1 mm, 2 mm and 3 mm have been provided in specimen and no change is found in the signal. The velocity of striker has been considered as 12 m/s for all the above analysis.

4.6. Effect of size and shape of cross section of specimen

Fig.7. Effect of striker-incident bar offset in signal Fig.8. Effect of specimen-incident bar/transmission bar offset in signal Finite element analysis of SHPB has been performed with the specimen of similar size diameter of incident and transmission bar as 13 mm. During the elastic analysis the complete signal is transmitted with no reflected signal but in the case of elasto-plastic analysis a part of signal is reflected back. This is due to mismatch in impedance, due to increase in area of specimen, on the either side of interface. The different shaped cross section of