PSI - Issue 60

N. Khandelwal et al. / Procedia Structural Integrity 60 (2024) 582–590 Author name / StructuralIntegrity Procedia 00 (2019) 000 – 000

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ranging from 0 to 150 mm for SSPW6-25, and 0 to 220 mm for SSPW 12-27. Load vs. displacement curve thus obtained from numerical simulation have been plotted in Figs. 4 and 5 for SSPW6-25 and SSPW 12-27 respectively. These curves are compared with the corresponding experimental results in the same figures for both the specimens. The curves, thus obtained from numerical results show good agreement with experimental result (within ±15% error) and clearly portray the plastic region and crack propagation region. PF variable ( ) contours representing the evolution of crack path as shown in Fig. 6 and 7 for SSPW6-25 and SSPW 12-27 respectively, indicate that the crack initiates from notches and propagates in the same notched circumferential plane of the specimen. The numerical crack propagation path well matched with experimental crack movement again validates the proposed methodology.

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Fig. 4. Load vs. displacement plot for specimen SSPW 6-25.

Fig. 5. Load vs. displacement plot for specimen SSPW 12-27.

5. Summary The study describes the experimental as well as numerical results of the fracture behaviour of the pipe specimens containing through wall crack at the centre. Numerical simulation of two pipe specimens to study crack behaviour are carried out in ABAQUS considering the phase field formulation. A user-defined element (UEL) subroutine is written and interfaced with ABAQUS work package, because inbuilt ABAQUS finite element can’t represent th e phase field formulation. The load-displacement curve thus obtained from the phase field method for both the pipes matches well with the experimental results. The crack propagation path obtained from the phase field method for both specimens is also similar to the experimental investigation. Thus, a good agreement between the numerical phase field result and experimental results opens a new field in fracture mechanics for solving multi-physics problem, which can further be extended in fatigue study.