Prediction of Fatigue Life in Notched Specimens Using Multiaxial Fatigue Criteria

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

فیروز اسماعیلی گلدرق ¹ , سجاد برزگر محمدی ² , علیرضا بابائی ³ , امیر افکار ⁴

1 - استادیار، گروه مهندسی مکانیک ،واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
2 - کارشناس ارشد مهندسی مکانیک، شرکت پتروشیمی خارک، خارک، ایران.
3 - مربی، گروه مهندسی مکانیک، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران.
4 - عضوهیات علمی گروه پژوهشی خودروونیرومحرکه،پژوهشکده برق،مکانیک وساختمان،پژوهشگاه استاندارد،کرج،ایران

Received: 2015-09-26 Accepted : 2015-09-26 Published : 2014-06-22

Keywords: Finite Element, notch, Multiaxial fatigue, Critical plane,

Abstract :

In this research, the effects of notch shape on the fatigue strength of 2024-T3 aluminum alloy notched specimens have been studied using experimental and multiaxial fatigue analysis. For this purpose, four set of specimens with different notch shape were prepared and then fatigue tests were carried out at various cyclic longitudinal load levels. Load controlled fatigue tests of mentioned specimens have been conducted on a 250kN servo-hydraulic Amsler H250 fatigue testing machine with the frequency of 10Hz. A nonlinear finite element ANSYS code was used to obtain stress and strain distribution in the specimens due to the longitudinal applied loads for all kinds of specimens. Estimation fatigue lives of the specimens were carried out with several different multiaxial fatigue criteria by means of local stress and strain distribution obtained from finite element analysis, i.e. KBM, FS, Crossland, VF and WY, by means of local stress and strain values obtained from finite element simulations. Results obtained from the multiaxial analysis revealed that among the applied criteria, the Crossland’s criterion has the best accuracy for all types of the specimens.

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