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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specimen have been analysed to understand its effect on signal. Three type of shape such as circular with diameter of 5 mm, square with side of 4.31 mm and triangular with side of 6.73 mm, the cross section area of each type of specimen are same. From analysis it have been observed that there is no effect in signal due to shape of specimen if cross section area are same.

Fig.9. Effect of cross section size of specimen

Fig.10. Effect of shape of specimen

5. Evaluati on of Johnson-Cook Parameters The quasi-static stress strain data (Pandey 2022) has been used for finding the Johnson-Cook parameters A, B and n. The flow stress (provided in Eq. 17) is the function of multiplication of three terms, first term represent the quasi-static loading behaviour, second term for strain rate term and third for thermal softening. For evaluating the parameters A, B and n, the strain rate term and temperature softening effect term are set to be unity by performing