PSI - Issue 13

Masataka Aibara et al. / Procedia Structural Integrity 13 (2018) 1148–1153 Masataka Aibara/ Structural Integrity Procedia 00 (2018) 000 – 000

1152

5

Fig. 5. A schematic of simulated fatigue crack growth. The dashed arrows indicate crack growth directions at respective positions.

4. Result

In order to increase the generality of the results, all parameters were made non-dimensional, and the following non dimensional number of cycle n and stress intensity factor of each point k were introduced. k value at each points A and B denoted as k A , k B . = { √ } (3) = √ (4) Figure 6 shows the relationship k and n at each point. When n = 0.083, the difference between k A and k B was approximately 3.2%, and it was considered that the equilibrium growth part absorbed the local growth part at this n , then the fatigue crack growth simulation was finished.

Fig. 6. The relationship between k and n at each point