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Endofem Integrated Methodology for Fatigue Crack Growth

Published online by Cambridge University Press:  05 May 2011

C. F. Lee  and
L. T. Hsiao
C. F. Lee*
Affiliation:
Department of Engineering Science, National Cheng-Kung University, Tainan, Taiwan 10617, R.O.C.
L. T. Hsiao*
Affiliation:
Nan-Jong Inst. of Technology
*
* Professor
** Assistant Professor
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Abstract

In this paper, the FEM with the incremental endochronic cyclic plasticity (EndoFEM) and the rc controlled node-released strategy are employed to study the fatigue crack opened/closed load (Pop) of Al 2024-T3 CCT specimens provided by Mageed and Pandey under several crack lengths and the constant amplitude with various load ratio (R). After statisfactory results are achieved by comparisons of computed Pop values and cited experimental data, the simulations will be extended to the crack lengths with significant bending effect due to short ligaments or high peak (Pmax) or high positive or very low negative R cyclic loads. Through these simulations, the complete map of Pop/Pmax vs. Kmax and R can be constructed and thereafter its correspondant empirical formulae can be proposed. Using these formulae and selecting the traditional fatigue crack growth parameter ΔKeff, the Al 2024-T3 fatigue crack growth rate da/dN vs. ΔK and R data, provided by Hiroshi and Schijve, can be employed to proposed empirical formulae of da/dN vs. ΔKeff and R. After integration, fatigue-crack-growth length a vs. N curves computed by EndoFEM can be obtained. The results are agreed very well with the existing experimental curves.

According to the above procedures of simulation and steps of comparions with experiment, this paper may provides an integrate methodology of numerical simulation in the studies of fatigue crack growth for academic and industrial researches and design analysis.

Keywords

EndoFEM with rc controlled node-released strategyCrack opened/closed loadBending effect of short ligamentCrack closure modelFatigue crack rate vs. ΔKeff
Type
Articles
Information
Journal of Mechanics , Volume 18 , Issue 2 , June 2002 , pp. 89 - 94
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2002

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References

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