PSI - Issue 64

Hamid Dahaghin et al. / Procedia Structural Integrity 64 (2024) 1192–1199 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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tip through the plate thickness. Fig. 7(b) depicts the stress distribution in the plate the after external load is applied. The increased cross-sectional area and compressive stress around the crack tip help arrest the crack even under external load. However, high stress levels are observed at the interface between the deposited WAAM and the steel plate, as shown in Fig. 7(b). To address this, the shape of the WAAM is altered to a pyramid using machining, as illustrated in Fig. 8. Fig. 9 compares the stress distribution along the deposition root shown in Fig. 7(b) for three different specimens. Thanks to the smooth WAAM shape, the maximum stress is reduced from 540 MPa to 390 MPa, as depicted in Fig. 9. Nevertheless, it is important to acknowledge that the machining process leads to extended repair times and increased expenses (Dahaghin et al., in press).

Fig. 6. Longitudinal stress distribution in the plate for reference sample (in Pa)

B

C

Section C-C

Section B-B

Deposited WAAM

Steel plate

B

C

(a)

B

C

G

C

Section B-B

Section C-C

B

(b) Fig. 7. (a) Longitudinal RS distribution (after deposition process) in the plate; (b) Longitudinal stress distribution (after applying external load) in the plate (in Pa)

Machined WAAM to the pyramid shape

Fig. 8. Stress distribution of the steel plate repaired with machined WAAM (in Pa)