PSI - Issue 66

Carl H. Wolf et al. / Procedia Structural Integrity 66 (2024) 26–37 4 Carl H. Wolf, Sebastian Henkel, Christian Düreth, Maik Gude and Horst Biermann / Structural Integrity Procedia 00 (2025) 000–000 (2) image recording with component loading, (3) 2 load cycles with image acquisition and a test frequency of f machine = 0,5 Hz, (4) depending on the specimen loading: loading from 23 to 9998 cycles with f machine = 5 Hz, (5) repetition of steps (3) and (4) until failure of specimen. The applied forces are given in Table 2 . The tensile force F tension was always applied cyclically. The compressive force F compression , on the other hand, was zero in the uniaxial case and a static load in the biaxial case. The test direction and the positioning of the compression stamps for biaxial loading are shown in Figure 3 . (a)

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(b)

(c)

Figure 2: Specimen design according to [1, 10, 15] to investigate the fatigue properties of the hole-notch arrangement. (a) Isometric view, (b) side view and (c) top view. All dimensions in mm. Table 2: Test parameters for the investigation of fatigue crack growth for uniaxial and biaxial loading. F tension, mean [kN] F tension, amplitude [kN] F compression [kN] 2.75 2.25 0.0/0.5/1.0 3.85 3.15 0.0/0.5/1.0