Abstract
Investigations on the fatigue crack growth of commercial pure titanium are carried out with cruciform specimens under different biaxial load ratios (λ = 0, 0.5, and 1) and crack inclination angles (β = 90°, 60°, and 45°) in this paper. Based on the finite element results, the modified solution of stress intensity factors KI and KII for cruciform specimens containing mixed mode I-II crack is obtained by considering crack size, biaxial load ratio, and crack inclination angles. The experimental results show that the maximum tangential stress criterion is fit for the prediction of crack initiation angles for mixed model I-II crack under uniaxial or biaxial loading condition. When the biaxial load ratio increases, the crack propagation angle becomes smaller, and so does the fatigue crack growth rate of mode I crack or mixed mode I-II crack. Based on an equivalent stress intensity factor, a new valid stress intensity factor is proposed to better describe the biaxial fatigue crack growth behavior, which can demonstrate the contribution of mode I and mode II of stress intensity factor.
Highlights
Uniaxial fatigue crack growth models are inadequate for mixed mode complex stress situations, so it is necessary to study the fatigue crack growth under biaxial loading
Fatigue crack growth behavior of Commercial pure titanium (CP-Ti) under different biaxial load ratios and crack inclination angles is investigated in this paper
Based on the finite element results, the shape coefficients and biaxial load ratio factor are obtained by regression, and the modified solutions of the stress intensity factors KI and KII for the cruciform specimens are derived
Summary
90°, 60°,isand the horizontal direction (X-axis) is changed according to biaxial load ratio λ, λ (λ = σx/σy) fatigue crack growth test, the crack needs to be prefabricated. Before the tion angle of 90°, the load crack perpendicular to the crack needs (Y-axis) is applied to propagate the fatigue growth test, the crack to be prefabricated. Fatigue growth is studied under biaxial load ratios performed [16],crack which is to eliminate the effect of machined notch0.5, on the crack growth. Biaxial load ratios of 0.5, In this paper, theinclination fatigue crack growth is 60°, studied. The fatigue crack growth is studied under biaxial load ratios of 0.5,.
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