The merit of Jahed-Varvani (JV) as an energy-based model and Smith-Watson-Toper (SWT) as a critical plane fatigue model are assessed for three wrought magnesium alloys. The raw data, including the stabilized strain-stress hysteresis loops and strain-life curves, was collected from the literature. The SWT model provided more scattered predictions than the JV model, which suggests that the JV model is more appropriate for fatigue modeling of wrought magnesium alloys, that exhibit anisotropic and asymmetric behavior. A discussion justifies the differences between the predictions of the two models. Eventually, the life of the materials in different directions is predicted by one set of JV parameters, which was previously extracted for AM30 in the transverse direction. The promising results provide supplementary support for the auspicious capability of strain energy density as a damage parameter for wrought magnesium alloys.
Notches are inevitable in many components and structures due to design limitations. In addition, they are the locations for stress concentration and are susceptible to fatigue failure. As a result, the cyclic stress/strain response at a notch is of key importance. Fiber Bragg Grating (FBG) sensors have been successfully utilized for mechanical and thermomechanical strain measurement in many cases; nevertheless, their capability of measuring strain at spots with intensive stress/strain has not yet been explored. In this research, FBG sensors are employed for strain measurement at the notch tip. A verification test was designed to substantiate the FBG measurements. The test involves a rectangular magnesium sheet with a center hole, subjected to uniaxial cyclic loading while the strain was measured at the notch tip using three different methods: strain gage, digital image correlation (DIC), and FBG. There were good agreements between the three measurements.
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