Abstract
The goal of this study was to evaluate the accuracy of different methods in correlating uniaxial fatigue properties to shear fatigue properties, as well as finding a reliable estimation method which is able to predict the shear fatigue behavior of steels and titanium alloys from their monotonic properties. In order to do so, axial monotonic as well as axial and torsion fatigue tests were performed on two types of steel and a Ti-6Al-4V alloy. The results of these tests along with test results of 23 types of carbon steel, Inconel 718, and three types of titanium alloys commonly used in the industry were analyzed. It was found that von Mises and maximum principal strain criteria were able to effectively correlate uniaxial fatigue properties to shear fatigue properties for ductile and brittle behaving materials, respectively. Also, it was observed that for steels and Inconel 718 obtaining shear fatigue properties from uniaxial fatigue properties which are in turn calculated from Roessle-Fatemi estimation method resulted in reasonable estimations when compared to experimentally obtained uniaxial fatigue properties. Furthermore, a modification was made to the Roessle-Fatemi hardness method in order to adjust it to fatigue behavior of titanium alloys. The modified method, which was derived from uniaxial fatigue properties of titanium alloys with Brinell hardness between 240 and 353 proved to be accurate in predicting the shear fatigue behaviors.
Highlights
Mechanical properties, both monotonic and fatigue, are key information in efficient design of components
The estimation methods often correlate the uniaxial monotonic properties of metallic materials, and especially steels, with their uniaxial strain-life fatigue properties. Methods such as four-point correlation proposed by Manson [2], modified four-point correlation proposed by Ong [3], universal slopes proposed by Manson [2], modified universal slopes proposed by Muralidharan and Manson [4], and uniform material law proposed by Bäumel and Seeger [5] have shown to result in close predictions of fatigue behavior for many steels
The goal of this study was to evaluate the performance of different methods in predicting the shear fatigue behavior of several classes of metallic materials from estimated uniaxial fatigue properties
Summary
Mechanical properties, both monotonic and fatigue, are key information in efficient design of components. The estimation methods often correlate the uniaxial monotonic properties of metallic materials, and especially steels, with their uniaxial strain-life fatigue properties. Methods such as four-point correlation proposed by Manson [2], modified four-point correlation proposed by Ong [3], universal slopes proposed by Manson [2], modified universal slopes proposed by Muralidharan and Manson [4], and uniform material law proposed by Bäumel and Seeger [5] have shown to result in close predictions of fatigue behavior for many steels. The Roessle-Fatemi method was shown to result in close predictions for uniaxial fatigue tests on 69 commonly used steels. This method has been widely used by many researchers and many studies such as [7,8,9,10] have shown good prediction results using this method
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