Multiaxial fatigue life prediction for titanium alloy TC4 under proportional and nonproportional loading

Refined Analysis of Fatigue Crack Initiation Life of Beam-to-Column Welded Connections of Steel Frame under Strong Earthquake

“…However, according to the study by Shamsaei and Fatemi [26] and Wu et al [27], the predicted fatigue lives are not highly sensitive to the exact value in the region of the short lives. Thus they suggested that the value in the FS parameter model can be approximately assumed as = 1.0 [17,26,27]. Figure 19 gives the comparison of fatigue life prediction between the FS parameter and the tests.…”

Micromechanics based fatigue life prediction of a polycrystalline metal applying crystal plasticity

“…Here, the fatigue life means the cycle number to failure of a material specimen under cyclic loading with a macro uniform deformation. The Manson-Coffin equation (Manson, 1953;Coffin, 1954) or its modification was widely used by some researchers to predict fatigue life of materials (Ni and Mahadevan, 2004;Buciumeanu et al, 2011;Roy et al, 2012;Wu et al, 2014;Ince and Glinka, 2014). But the premise for using this equation is that a series of fatigue experiments of the material needs to be carried out to obtain the respective fitting parameters in the equation.…”

A fatigue model for sensitive materials to non-proportional loadings

“…These experiments include different loading paths and materials such as Inconel 718 [21], 304 steel [22], 1045 Steel [23], S460 [24], 30CrNiMo8HH [25], and Titanium TC4 [12]. In addition, to evaluate the accuracy of the model, obtained results were compared with predicted lives through some prominent fatigue models including maximum shear strain, SWT, and FatemiSocie.…”

“…Chen et al [9] proposed non-proportionality factor as ratio of a circle area with a radius equals the maximum shear strain to the swept area by maximum shear strain in different directions in polar coordinates. Fatigue models do not predict a higher level of damage under non-proportional loadings than proportional loadings [10][11][12], this leads to over-estimated fatigue life for nonproportionality sensitive materials under non-proportional loadings [10][11].…”