PSI - Issue 57

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Ahmad Qaralleh et al. / Procedia Structural Integrity 57 (2024) 649–657 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

652

Fig. 2 Unnotched specimen geometry

3. Experimental Setup Force-controlled tests are carried out for the steering knuckles. A total of 24 steering knuckles were tested. The test rig is shown in Fig. 3. These cyclic tests are carried out with both constant and variable amplitudes for the two load ratios R= -1 and R= 0 using a servo-hydraulic testing machine. To determine the experimental variable amplitude curve, which is also known as the Gassner curve (Gassner, 1983), load-time functions follow the Gaussian distribution were used .

Steering Kunckel

Fig. 3 Schematic representation showing the test rig of the steering knuckle.

The study is including strain-controlled tests under constant and variable loading (Incremental Step Test). The tests with constant strain amplitudes are essential for determining the strain curve, whereas the incremental step tests are used to examine the effect of higher stresses on the material behavior when subjected to small amplitudes.