Computation of Effective Fatigue Thresholds Based on a New Concept of Crack Closure


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A new theoretical concept of crack closure under plain strain was applied to assess the effective fatigue threshold under various loading condition for selected aluminium and titanium alloys of different microstructures. The concept is based on the long-range effect of geometrically necessary dislocations remaining in the wake of propagating fatigue cracks. Calculated threshold values FKeff,th for 7475 aluminium alloy are about 1.9 MPa.m1/2 (in vacuum) and 1 MPa.m1/2 (in air), and about 2.5 MPa.m1/2 and 3.3 MPa.m1/2 for c-titanium and Ti-2.5%Cu, respectively. All calculated values are nearly independent on both the microstructure and the applied stress ratio and they are in a good agreement with experimental data.



Key Engineering Materials (Volumes 324-325)

Edited by:

M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz




J. Horníková et al., "Computation of Effective Fatigue Thresholds Based on a New Concept of Crack Closure", Key Engineering Materials, Vols. 324-325, pp. 803-806, 2006

Online since:

November 2006




[1] R. Pippan, G. Strobl, H. Kreuzer and C. Motz: Acta Mater. Vol. 52 (2004), p.4493.

[2] J. Pokluda, P. Šandera and J. Horníková: Fat. Fract. Engng. Mater. Struct. Vol. 27 (2004), p.141.

[3] J. Pokluda and R. Pippan: Mater. Sci. Eng. A (2006), in press.

[4] J. Pokluda, P. Šandera and J. Pippan, in: 9th International Fatigue Congress, Atlanta (2006), in press.

[5] G. Chai and J. Pokluda, in: 9th International Fatigue Congress, Atlanta (2006), in press.

[6] R. Pippan, M. Berger and H. P. Stüwe: Metallurgical Transactions Vol. 18A (1987), pp.429-435.

[7] R. D. Carter, E. W. Lee, E. A. Starke, Jr. and C. J. Beevers: Metallurgical Transactions Vol. 15A (1984), pp.555-563.

[8] J. L. Robinson and C. J. Beevers: Metal Science Journal Vol. 7 (1973), pp.153-159.

[9] J. K. Gregory, in: ASM Handbook, Fatigue and Fracture Vol. 19, edited by S. R. Lampman et al., ASM Int. (1996), pp.845-853.

[10] S. H. Wang and C. Müller: Materials Science and Engineering Vol. A255 (1998), pp.7-15.

[11] B. L. Boyce and R. O. Ritchie: Engineering Fracture Mechanics Vol. 68 (2001), pp.129-147.

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