PSI - Issue 68

J.C. Gomez-Mancilla et al. / Procedia Structural Integrity 68 (2025) 1208–1215 Gomez-Mancilla J / Structural Integrity Procedia 00 (2025) 000–000 St

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Fig. 5. Probe’s bending response. β’, β’’ criteria (upper graph), vs. 1 st bending freq. component (Ch2), (lower).

6. Probe's Damage Study by X-ray Tomography (XCT) Fig. 6 below is X-ray scanning. After receiving the probe from PIMM Lab at the end of the test, but with no damage analysis on such probe, nor any information, the author requested examining it by X-ray computerized tomography (XCT) using GE Phoenix v|tome|x m. The objective is to detect early microcracks and micro-slip crack damage in the metal specimen subjected to preliminary fatigue cycles. The inspection was performed using (XCT) with a slice resolution of 35 µm. Micro-slip cracks in sub-surface areas. Micro-slip cracks in sub-surface regions.

Fig. 6. At LHS the analyzed test probe with neck indicating the scanning location, the RHS images show details of found micro-slip-cracks.

6.1 Slip band cracks at 300 µm depth. The identified micro-slip cracks have a length of approximately 120 µm and are associated with their formation by intergranular slippage. These characteristics suggest that the material is experiencing localized plasticity, which could accelerate the propagation of larger failures with additional cycles.