Abstract
In this study, the fatigue characteristics of aluminum alloys and mechanical components were investigated. To evaluate the effect of forging, fatigue specimens with the same chemical compositions were prepared from billets and forged mechanical components. To evaluate the cleanliness of the aluminum alloys, the cross-sectional area of specimens was observed, and the maximum inclusion sizes were obtained using extreme value statistics. Rotary bending fatigue tests were performed, and the fracture surfaces of the specimens were analyzed. The results show that the forging process not only elevated the fatigue strength but also reduced the scatter of the fatigue life of aluminum alloys. The fatigue characteristics of C-specimens were obtained to develop finite-element method (FEM) models. With the intrinsic fatigue properties and strain–life approach, the FEM analysis results agreed well with the test results.
Highlights
Scroll compressors have been widely used in the automobile and air-conditioning industries
The normalized fatigue strengths indicate the discrepancy between the test stress amfailure mechanism, but when Al-NF alloy specimens failed from inclusions, Nf significantly plitude and the hypothetical fatigue limit of the specimen
Using the C-specimens, the fatigue life of the mechanical components was evaluated at various load levels.of
Summary
Scroll compressors have been widely used in the automobile and air-conditioning industries. Where ni and Ni is the number of life cycles and the fatigue life in cycles at a certain stress level, respectively, and D is the damage fraction Another factor used to calculate the crack initiation cycle is the mean stress effect, which provides a counting method for correction of nonuniform loading conditions [18]. Ince et al [19] indicated that the SWT model can apply changes in the load by calculating the energy multiplied by σmax This method is flexible, under high-loading conditions. They applied the same methodology to predict fatigue characteristics using the SWT model to evaluate the multi-axial fatigue life [19]. Bending fatigue tests were carried out using a servo hydraulic test machine, Model 810 from MTS (Eden Prairie, MN, USA), and the results were compared to the FEM analysis results
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