Critical Strain Energy Density along the Curved Front of the Growing Fatigue Crack


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A two-parameter constraint-based fracture mechanics approach is used to explain the effect of the constraint on the apparently anomalous behavior of short fatigue cracks. The different levels of stress constraint are quantified by the T-stress, and microstructurally as well as mechanically short cracks are discussed. Short cracks generally behave more sensitively to the constraint than the long ones. It is shown that in most cases, the existence of short cracks goes hand in hand with an intrinsic loss of the constraint, which contributes to a decrease of their fatigue threshold values and accelerates their growth. In this paper, the above effect is quantified and conclusions concerning the applicability of the fracture mechanics parameters and approaches to the estimation of the residual fatigue life of structures are discussed.



Edited by:

Jaroslav Pokluda




T. Denk et al., "Critical Strain Energy Density along the Curved Front of the Growing Fatigue Crack", Materials Science Forum, Vol. 482, pp. 307-310, 2005

Online since:

April 2005




[1] Skelton, R. P. - Vilhelmset, T. - Webster, G. A.: Energy Criteria and Cumulative Damage During Fatigue Crack Growth. Int. J. Fatigue, vol. 20, no. 9, 1998, pp.641-49.


[2] Pandey, K. N. - Chand, S.: An Energy Based Fatigue Crack Growth Model. Int. J. Fatigue, vol. 25, 2003, pp.771-778.

[3] Oliva, V. - Materna, A. - Michlik, P.: Three-Dimensional FEM Model of the Fatigue Crack Growth in a Thick CT Specimen. MSMF-3, 2001, pp.368-378.

[4] Oliva, V. - Materna, A. - Denk, T.: FEM Model of Planar Fatigue Crack with Curved Crack Front. Fractography 2003, pp.26-33.

[5] Sih, G. C. - Moyer, E. T. Jr.: Path Dependent Nature of Fatigue Crack Growth. Engng. Fract. Mech., 17, 1983, vol. 3, pp.269-280.


[6] Materna, A. - Oliva, V.: Strain Energy Density Ahead of Crack Front as a Measure of Local Material Degradation In: Degradácia konštrukčných materiálov. Žilina: EDIS-vydavatelstvo ŽU, 2003, pp.25-29. ISBN 80-8070-112-1. (in Czech).

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