PSI - Issue 71

Poshadri Chathri et al. / Procedia Structural Integrity 71 (2025) 309–316

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increased stress can exceed the material’s yield strength, initiating cracks more easily compared to a smooth, without pitted sample. This makes the material more prone to failure under applied stress. The synergistic effect of the presence of pits formed under corrosion media along with the mechanical loading makes the samples with pits samples more prone to failure.

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Fig. 4. a. 3D model of the specimen with random pits, b . Finite element model of the specimen c. Refined mesh of pit.

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Fig. 5. a . Von-Mises stress distribution of fractured random pits specimen, b. Stress-strain curve with pits c. Stress-strain curve validation with reference paper and comparison with and without pits.

3. Results and discussion 3.1. Without pits specimen

Fig. 6a presents the von-Mises distribution of the fractured surface of the without pits specimen and Figure 6b. shows the force vs displacement plot by incorporating all the parameters and constraints from the literature (Liu et al., 2023). The maximum force for the original specimen is 69.85 KN, and the displacement is 51.12 mm. a b

Fig. 6. a. Von-Mises stress distribution of fractured specimen, b. Force vs Displacement curve without pits

3.2. Random spherical and different shapes of pits with different aspect ratios, with inline and random orientations. Fig. 7 a-b illustrates the comparison between force-displacement curves of specimens with and without pits based on its various aspect ratios. Reduction in both force and displacement values are observed in specimens with an aspect