PSI - Issue 18

Christoph Bleicher et al. / Procedia Structural Integrity 18 (2019) 46–62 Author name / Structural Integrity Procedia 00 (2019) 000–000

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(b)

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(d)

Fig. 8. (a) Comparison of the results of computer tomography for a specimen with Dross and (b) without Dross as well as (c) a results for magnetic particle inspection and (d) the sulphur test.

2.4. Fatigue tests The fatigue tests were performed on servo-hydraulic test rigs with a maximum load capacity of 63 kN, until a loss of stiffness of the specimen of 20 % compared to the initial state, or until the achievement of the limit number of cycles of N lim = 1ꞏ10 7 with test frequencies between 0.05 and 25.00 Hz. All fatigue tests were performed, according to Stahlinstitut (2006), under strain control at alternating loading, R ε = -1, using an extensometer with a test length of 25 mm mounted on the test volume of each fatigue specimen. This enabled a control of the fatigue and material behaviour of Dross during the fatigue test and also a determination of the cyclic stress-strain curve as well as the strain-life curve. A picture of the fatigue test rig is given in Fig. 9.

Fig. 9. Fatigue test rig