168
I. S. Nikitin et al.
a
b
Fig. 12.7 VHCF fatigue curves σ max (N ) for V-notched Al-alloy specimen, where ◦ means real
test points, • means calculating points: a R = −1, b R = 0.01
12.5 Conclusions
A multi-mode kinetic model of cyclic loading damage development is proposed to
describe the fatigue fracture process development. To determine the coefficients of
the kinetic equation of damage, the well-known criterion of multiaxial fatigue failure
SWT based on the mechanism associated with the development of microcracks of
normal detachment is used.
A procedure has been proposed for calculating the kinetic equation coefficients
for various fatigue failure modes of the LCF-HCF and VHCF. A numerical method
for calculating crack-like zones up to macrofracture is proposed. The model parameters are determined from the condition of matching the experimental and calculated
fatigue curve for a specimen of a certain geometry at a given load amplitude and
cycle asymmetry coefficient. Using the obtained values, the results of experiments
on specimens of a different geometry and asymmetry coefficients were reproduced
and the model and calculation algorithm performance were confirmed.
Acknowledgements The study was carried out with a grant from the Russian Science Foundation
(project No. 19-19-00705).
References
1. Basquin, O.H.: The exponential law of endurance tests. Proc. Am. Soc. Test. Mater. 10, 625–630
(1910)
I. S. Nikitin et al.
a
b
Fig. 12.7 VHCF fatigue curves σ max (N ) for V-notched Al-alloy specimen, where ◦ means real
test points, • means calculating points: a R = −1, b R = 0.01
12.5 Conclusions
A multi-mode kinetic model of cyclic loading damage development is proposed to
describe the fatigue fracture process development. To determine the coefficients of
the kinetic equation of damage, the well-known criterion of multiaxial fatigue failure
SWT based on the mechanism associated with the development of microcracks of
normal detachment is used.
A procedure has been proposed for calculating the kinetic equation coefficients
for various fatigue failure modes of the LCF-HCF and VHCF. A numerical method
for calculating crack-like zones up to macrofracture is proposed. The model parameters are determined from the condition of matching the experimental and calculated
fatigue curve for a specimen of a certain geometry at a given load amplitude and
cycle asymmetry coefficient. Using the obtained values, the results of experiments
on specimens of a different geometry and asymmetry coefficients were reproduced
and the model and calculation algorithm performance were confirmed.
Acknowledgements The study was carried out with a grant from the Russian Science Foundation
(project No. 19-19-00705).
References
1. Basquin, O.H.: The exponential law of endurance tests. Proc. Am. Soc. Test. Mater. 10, 625–630
(1910)