PSI - Issue 39

D. Fedotova et al. / Procedia Structural Integrity 39 (2022) 419–431 Author name / Structural Integrity Procedia 00 (2019) 000–000

428 10

steels 34X and P2M, which have the same elastic properties, the dependences of the elastic SIFs on the crack length in the CTS sample coincide (Fig. 5a). On the contrary, for the same steels under the same loading conditions, the distributions of the plastic HRR SIFs differ significantly from each other (Fig. 5e) because of the influence of the plastic properties of the materials. Plastic SIFs for SGP (Fig. 5e and 5f) have a different distribution compared to the classic plastic SIFs for HRR. In the plasticity of HRR steel P2M has the lowest value in the distributed SIFs, whereas new intensity factors SGP for steel P2M has the greatest value of distributions, both for mode I and mixed modes. These dependences are apparently related to a different type of singularity at the crack tips for two plastic models. Mode I Mixed mode a b

c

d

e

f

Fig. 5. (a, b) elastic SIFs, (c, d) classical plastic HRR SIFs and (e, f) new plastic SIFs SGP under pure mode I and initial mode II loading.