PSI - Issue 13

Barış Tanrıkulu et al. / Procedia Structural Integrity 13 (2018) 1840 – 1844 Author name / Structural Integrity Procedia 00 (2018) 000–000

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Figure 2. Cold forming simulation results (Effective plastic strain)

Figure 3. Cold forming simulation results with various socket depth (Effective Plastic Strain)

2.3. Experimental procedure and setups Torque-tension and fatigue experiments were conducted for all the sample types. Axial fatigue tests were carried out by mounting fasteners on the test device with a locking length of 30 mm. The schematic representation of the test system is shown in Figure 4(b).

Figure 4. (a) Fatigue test setup; (b) Torque-Tension test setup

The load applied during the tests were obtained with reference to the proof load value of the bolt M8 10.9 according to DIN 898-8. Accordingly, mean load values were taken as 70% of the fasteners proof loads and fasteners were subjected to an alternating stresses, corresponding to 10%, 15% and 20% of the proof load values which were 21,1 kN (proof load), 4 kN, 6 kN and 8 kN (alternating loads) respectively. Each set of experimental procedure was repeated five times. In the Torque-tension tests, instantaneous detection of the change in the clamp load occuring on the fasteners during the