PSI - Issue 39

A.L. Pinto et al. / Procedia Structural Integrity 39 (2022) 409–418 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Table 1 – Monotonic and cyclic properties of 7050-T7451 aluminum alloy. Young's Modulus, 71.7 GPa Poisson's ration, 0.33 MPa Yield stress, 469 MPa Ultimate tensile strength, 524 MPa Fatigue limit range, −1 292 MPa Threshold stress intensity factor range, ℎ 5.5 MPa √ Friction coefficient, 0.54 Critical distance, 113 Table 2 – Loading and geometry configurations of fretting experiments.

Load config. (N/mm) (N/mm) / R (mm) a (mm) 0 (MPa) (MPa) C1 240 800 0.3 70 1.34 380 0 C2 320 800 0.4 70 1.34 380 0 C3 400 800 0.5 70 1.34 380 0 C4 136.4 341 0.4 30 0.57 380 0 C5 136.4 341 0.4 30 0.57 380 25 C6 136.4 341 0.4 30 0.57 380 50 C7 320 800 0.4 70 1.34 380 25 C8 320 800 0.4 70 1.34 380 50

Figure 5 – Schematic of tests loading history.

5. Results and discussions Figure 6 presents crack path estimates for the tests C2, C3 e C4. The solid black lines represent the experimental crack path. The solid red and blue lines depict the results from Method 1 and Method 2 respectively. Note that the crack paths obtained by Method 1 are very close to the experimental ones. On the other hand, considering the Method 2, crack path estimates presented a persistent deviation from the experimental observations.