PSI - Issue 60

S.K. Chandra et al. / Procedia Structural Integrity 60 (2024) 203–213 Author name / Structural Integrity Procedia 00 (2019) 000 – 000 9 Figure 10(a) shows that the 5 −∆ curves for pre-cracked SENT and DENT specimen show good match up to a certain extent of crack growth ∆ , but progressively increasing deviation with increasing ∆ beyond this point. ( 5 )−∆ data for both the specimens were computed using the entire data set, Fig. 10(b). However, for identifying the approximate range for ( 5 ) measurements, only the initial data set up to the point of matching in Fig. 10(a) could be considered. The results basically confirm the transferability of 5 −∆ data between these two geometries. The increasing difference with increasing ∆ beyond the matching point may be attributed to the difference in the geometry dependences beyond the respective critical CTOA regimes in these two geometries. 211

Fig. 10. (a) δ 5 −∆a and (b) φ(δ 5 )−∆a curves for pre-cracked SENT and DENT specimens.

Fig.11. (a) δ 5 −∆a and (b) φ(δ 5 )−∆a curves for pre-cracked and notched SENT specimens. Figures 11(a) and 11(b) compare respectively the 5 −∆ curves and the ( 5 )−∆ plots for a notched ( =0.1 mm) and a pre-cracked SENT specimen. As expected from results presented in Fig. 6, the initial transient regime persists to a higher ∆ level for the notched specimen, Fig. 11(b); for higher levels of ∆ , the plots for notched and pre-cracked specimens show good agreement. Here it is worth-mentioning that usually, the notch specimens are