Abstract
The experimental study of heat flux evolution at the fatigue crack tip during uniaxial and biaxial loading was carried out. The plane samples of Grade 2 titanium alloy were weakened by notch to initiate fatigue crack. A contact heat flux sensor based on the Seebeck effect was used for monitoring of the dissipated energy. During the tests, the samples were subjected to cyclic loading with constant stress amplitudes and different biaxial parameter. Based on the analytical estimation of heat dissipation at the crack tip we proposed an approximation of heat dissipation as a function of crack growth rate. The approximation is universal for all considered loading types (uniaxial and biaxial). A linear correlation between crack growth rate and heat dissipation was obtained.
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