PSI - Issue 60

A.K. Dwivedi et al. / Procedia Structural Integrity 60 (2024) 286–297 A.K.Dwivedi/ Structural Integrity Procedia 00 (2019) 000 – 000

295

10

Figure 8: Effect of initial shape and clustering of secondary voids on (a) normalized crack driving force J/(σ 0 X 0 ) versus crack extension, (b) variation of J/(σ 0 X 0 ) as a function of the reduction in the ligament between the crack tip and the nearest void. The initial volume fraction of primary and secondary voids is 1.6% and 0.06%, respectively.

Figure 9: Contours of equivalent plastic strain showing details of two-scale void interaction and the resulting crack growth. Idealized linear clusters of circular secondary voids are modelled at an angle Ɵ=45 with respect to the initial crack plane. Contours shown in (a) and (b) are extracted at J = 0.483 σ 0 X 0 and J = 0.625 σ 0 X 0 , respectively.