PSI - Issue 52

A.D. Cummings et al. / Procedia Structural Integrity 52 (2024) 762–784 A. Cummings / Structural Integrity Procedia 00 (2023) 000–000

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Wang NTS model

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Normalised T-stress

Crack Front Position Φ [°]

Fig. A.2. Benchmarking model and results (a) Our benchmark model (b) Comparison of results after Wang (2003)

of the base and the half-crack length. Fig. A.3 shows the results of the extrapolation and explains why the Annex N solutions do not produce the same values of T-stress as the FEA models used in this report. Further extrapolation was required because no embedded flaw solutions exist in BS7910 (2019). It was found that the T-stress results from embedded flaw models were in-keeping with these results and therefore also considered acceptable.

Fig. A.3. Normalised T-stress results of benchmarking and extrapolation cases showing the limits of the polynomial expressions in Annex N of BS7910 (2019)