PSI - Issue 18

A. Vshivkov et al. / Procedia Structural Integrity 18 (2019) 608–615 Author name / Structural Integrity Procedia 00 (2019) 000–000

612

5

da ~Q dN

  

  

. The characteristic dependences are shown in figures

and in the second stage – to the power of heat flux

2

4, 5.

Crack rate, m/cycle

a)

b)

Fig. 4. Dependence between crack rate and heat flux in the first (a) and second (b) stages for uniaxial mode.

a)

b)

Fig. 5. Dependence between crack rate and heat flux in the first (a) and second (b) stages for biaxial mode.

4. Theoretical calculation of heat dissipation Using approach suggested in [14] the energy of plastic deformation at the fatigue crack tip can be estimated as follows:     dN a A a A dl dN dl W A ,r W A ,r dN dU p p tot p 2 2 2 1 2 2 2 1         , (2)