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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

[1]Newman, J. C. Jr., “A Finite Element Analysis of Fatigue Crack Closure,” ASTM STP, 590, pp. 281–301 (1976).Google Scholar
[2]McClung, R. C. and Sehitoglu, H., “On The Finite Element Analysis of Fatigue Crack Closure—1. Basic Modeling Issues,” Engnr. Fracture Mechanics, 33, pp. 237–252 (1989).CrossRefGoogle Scholar
[3]Nakagaki, M. and Atluri, S. N., “Elastic-Plastic Analysis of Fatigue Crack Closure in Modes I and II,” AIAA J., 18, pp. 1110–1117 (1980).CrossRefGoogle Scholar
[4]Hoff, R. and Rubin, C. A., “A New Finite-Element Technique for Modeling Stable Crack Growth,” Engnr. Fracture Mechanics, 23, pp. 105–118 (1986).CrossRefGoogle Scholar
[5]Mahanty, D. K. and Maiti, S. K., “Experimental and Finite Element Studies on Mode I and Mixed (I and II) Stable Crack Growth—I. Experimental, II. Finite Element Analysis,” Engnr. Fracture Mechanics, 37, pp. 1237–1275 (1990).CrossRefGoogle Scholar
[6]ASTM E647-90, “Measurement of Fatigue Crack Growth Rates,” Annual Book of ASTM Standards, 03.01 ASTM 1990, Philadelphia, PA, USA (1990).Google Scholar
[7]Abdd Mageed, A. M. and Pandey, R. K., “Effect of Measurement Location and Fatigue-Loading Parameters on Crack Closure Behavior,” Materials Science and Engineering, 150, pp. 43–50 (1992).CrossRefGoogle Scholar
[8]Lee, C. F. and Hsiao, L. T., “EndoFEM Crack Closure Analysis of Al 2024-T3 CCT Specimen under All Tension Fatigue Loading,” The Chinese Journal of Mechanics, 16, pp. 203–215 (2000).CrossRefGoogle Scholar
[9]Hiroshi, M. and Schijve, J., “Fatigue Crack Growth in Aluminum Alloy Sheet Material Under Constant-Amplitude and Simplified Flight- Simulation Loading,” Report LR-381, Delft University of Technology, Delft, The Netherlands (1983).Google Scholar
[10]Shin, C. S. and Li, R. Z., “Fatigue Crack Propagation in the Elastic-Plastic Regime in a Low Alloy Structural Steel,” Special Issue on Fracture Mechanics and Fatigue, Journal of Chinese Institute of Engineers, 22, pp. 275–284 (1999).Google Scholar
[11]Lee, C. F., “Recent Finite Element Applications of the Incremental Endochronic Plasticity,” Int. J. Plasticity, 11, pp. 843–865 (1995).CrossRefGoogle Scholar
[12]Hsiao, L. T. and Lee, C. F., “EndoFEM Node- Released Strategy in the Simulation of Fatigue Crack Closure Phenomena,” The Chinese Journal of Mechanics, 14, pp. 57–66 (1998).CrossRefGoogle Scholar
[13]Lee, C. F., “Simulation of CCT Fatigue Crack Open/Closure Phenomena of A1 2024-T3 via Computational Endochronic Plasticity,” The 6th Int. Sym. Plasticity and Its Current Applications, ed., Khan, A. S., Neat Press, Fulton, Maryland, USA, pp. 361–362 (1997).Google Scholar
[14]Lee, C. F., “Crack Growth Simulation via Computational Endochronic Plasticity,” Proc. 12th Eng. Mech. Conf. ASCE, La Jolla, CA, USA, ed. Murakami, H. and Luco, J. E., pp. 972–975 (1998).Google Scholar
[15]Newman, J. C. Jr., “A Crack Opening Stress Equation for Fatigue Crack Growth,” Int. J. Fracture, 24, pp. 131–135 (1984).CrossRefGoogle Scholar