PSI - Issue 21

Gürzap İ. Demirel et al. / Procedia Structural Integrity 21 (2019) 101 – 111 Gürzap / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 7 Crack initiation times of the aluminum and steel notched beams

Aluminum Notched Beam

Steel Notched Beam

Specimen #

Life (s)

Life (s)

825 840 895 435 730 869 876 855

480 398 445 673 476 500 597 521 387 475 341 408 413

1 2 3 4 5 6 7 8 9

1120

880

10 11 12 13

- - -

832.5 170.4

470.3

Mean

Standard Deviation

90.1

Table 8 compares the results of experimental vibration fatigue analysis results and vibration fatigue analysis results performed for two different UTS values which are integer multiples of 100 MPa. It is seen that the selected UTS value is highly effective on the vibration fatigue analysis results. Experimentally determined fatigue life are encompassed within the fatigue lifes obtained by the vibration fatigue analyses corresponding to the UTS values which are integer multiples of 100 MPa. In this regard, it can be inferred that vibration fatigue test and analysis results agree considerably well.

Fig. 6 The vibration fatigue test setup of the notched beams