PSI - Issue 52

Xuran Xiao et al. / Procedia Structural Integrity 52 (2024) 111–121 Xuran Xiao/ Structural Integrity Procedia 00 (2023) 000 – 000

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5

where, 0 and are crack initial length and final crack length.

Fig.4. Range of stress intensity factor with crack growth length in smooth specimen As the Paris law parameters are dependent on =0 , the Walker Equation (Dowling, Calhoun et al. 2009) is applied to calculate the equivalent stress intensity factor ( Δ ) from the range of SIFs shown in Figure 4, for fully reversed load =−1 . ∆ = ∆ (1 − ) 1− (7) The results for Δ are shown in Figure 5. The crack growth life of standard smooth specimens is shown in Figure 6, where the results are also approximated by exponential function as: log( ) = 7.39 − 0.00824 (8)

Fig.5. ΔKeqv with crack growth length