PSI - Issue 28

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Barış Tanrıkulu et al. / Procedia Structural Integrity 28 (2020) 1267 – 1275 Author name / Structural Integrity Procedia 00 (2019) 000–000

1270

Fig. 2. Technical drawing and sample photo of plates used in junker vibration test

2.2. Experimental procedure and setups Within the scope of the experimental study, tests were carried out to examine the effect of tightening strategy, clamp length and plate hardness. During the tests, two different strategies were used as tightening the fastener from the nut or bolt head. The test plan given in Table 1 was created by combining plate hardness, tightening strategies and clamp length values for the Junker vibration tests. Results were averaged by performing 5 repetitions for each test combination so that total of 45 experimental tests were performed. The schematic representation of the Junker test device where loosening tests were performed is given in Figure 3.

Table 1. Experimental test combinations. Experimental test Plate Hardness

Nut Type

Tightening Strategy Bolt Head Nut Head Nut Head Bolt Head Nut Head Nut Head Bolt Head Nut Head Nut Head

Clamp Length 29 mm 29 mm 29 mm 40 mm 40 mm 40 mm 40 mm 40 mm 40 mm

Set 1 Set 2 Set 3 Set 4 Set 5 Set 6 Set 7 Set 8 Set 9

175 HV 175 HV 175 HV 175 HV 175 HV 175 HV 300 HV 300 HV 300 HV

Rip Nut Rip Nut Plain Nut Rip Nut Rip Nut Plain Nut Rip Nut Rip Nut Plain Nut