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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4.2. Comparison of elastic and elasto-plastic model

Elasto-plastic finite element analysis of Split-Hopkinson Pressure Bar has been carried out to compare the result with elastic analysis. This analysis may be use full to predict the behaviour of material undergo only elastic deformation. Sometime due to large size or high elastic modulus of specimen material or low velocity of striker, the specimen will be in the elastic region only. The transmitted signal for elasto-plastic case is lower than the elastic case because the tangent modulus of elasticity decrease with plastic deformation. The reflected signal is more for elasto-plastic analysis compare to elastic analysis since the sum of incident and reflected signal is equal to the transmitted signal. In the elasto-plastic behaviour of specimen the amplitude of transmitted signal increases with time due to strain hardening of material.

Fig. 3. Comparison of elastic and elasto-plastic model of SHPB analysis

4.3. Mesh convergence

The elasto-plastic analysis of Split-Hopkinson Pressure Bar have been performed with three different mesh size of specimen such as 0.5 mm, 0.4 mm and 0.3 mm. It has been observed from Fig. 4 that the signal is same for the all analyses hence analysis is converged with chosen mesh size as 0.5 mm.