Fatigue life and crack path prediction in 2d structural components using an adaptive finite element strategy

Abdulnaser M. Alshoaibi, and Ariffin, A.K., (2008) Fatigue life and crack path prediction in 2d structural components using an adaptive finite element strategy. International Journal of Mechanical and Materials Engineering, 3 (1). pp. 97-104. ISSN 1823-0334

Affiliations

Universiti Kebangsaan Malaysia, Faculty of Engineering. Dept. of Mechanical & Materials Engineering
Universiti Kebangsaan Malaysia, Faculty of Engineering. Dept. of Mechanical & Materials Engineering

Abstract

Fatigue crack propagation in two-dimensional structural components under constant amplitude loading is analyzed using an adaptive finite element procedure. The stress-intensity factors are estimated by using displacement correlation technique utilizing the purposely constructed singular elements around the crack tip with automatic remeshing algorithms. The propagation is modeled by the successive linear extensions under the linear elastic assumption. Subsequently, the fatigue life cycle is estimated based upon Paris’ equation. The test for the first specimen which is the single centered angled crack is applied only to show the accuracy and efficiency of this method to calculate accurate values of stress intensity factors. Subsequently, fatigue analysis is applied for two geometry specimens namely, single edge angled crack and modified four points bending SEN specimen. Verification of the predicted fatigue life is validated with relevant experimental data and numerical results obtained by other researchers. The comparisons show that the program is capable of demonstrating the fatigue life prediction results as well as the fatigue crack path satisfactorily.

Item Type:

Journal

Keywords:

Fatigue; adaptive mesh; finite elements; crack propagation; stress intensity factors; constant amplitude loading.

Subjects:

T Technology, Engineering

ID Code:

10410