Patternanalysis of the Severity of Multiple Crack Arrays


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Multiple Site Damage (MSD) is a typical problem of aging aircraft structures. On the other hand a similar situation may occur, if damages in the vicinity of the crack tip of a large crack is investigated. In some preceding papers the author has shown the possibility to assess the criticality of a MSD-scenario by comparing certain data compression measures of the crack scenario in an early stage. All of these scenarios were linked to cracks in one row of fasteners of equal distance, and the method was used in conjunction with the Monte-Carlo Simulation. The idea of using such ways to assess multiple crack scenarios is extended now in the paper presented here. The investigations are extended now in the sense that, the scenarios are more complex as they include large cracks and small cracks in the vicinity of the crack, where no fixed distance of the cracks is foreseen. The attempt is made to relate such results to experimental data on residual strength and therefore, to relate them to sophisticated models like the Gurson model.



Key Engineering Materials (Volumes 348-349)

Edited by:

J. Alfaiate, M.H. Aliabadi, M. Guagliano and L. Susmel




P. Horst, "Patternanalysis of the Severity of Multiple Crack Arrays", Key Engineering Materials, Vols. 348-349, pp. 193-196, 2007

Online since:

September 2007





[1] J.C. Newman: Advances in fatigue and fracture mechanics analyses for aircraft structures, Plantema Memorial Lecture, ICAF 1999, (1999).

[2] A.L. Gurson: Continuum theory of ductile rupture by void nucleation and growth: Part1-Yield criteria and flow rules for porous ductile media, J. Engg. Materials Technology, vol. 99, (1977), pp.2-15.


[3] T. Siegmund and W. Brocks: Prediction of the work of separation and implications to modeling, Int. J. of Fracture, vol. 99, (1999), pp.97-116.

[4] T. Pardoen and J.W. Hutchinson: Micromechanics-based model for trends in toughness of ductile metals, Acta Materialia, vol 51 (2003), pp.133-148.


[5] K-F. Nilsson and J.W. Hutchinson: Interaction between a major crack and small crack damage in aircraft sheet material, Int. J. Solids Structures, vol. 31, (1994), pp.2331-2346.


[6] P. Horst: Criteria for the Assessment of Multiple Site Damage in Ageing Aircraft Structural Integrity & Durability, Vol. 1 (2005), pp.49-65.

[7] D.A. Hills, P.A. Kelly, D.N. Dai and A.M. Korsunsky: Solution of crack problems - The distributed dislocation technique, Kluwer (1996).

[8] P. Horst: A simple numerical model for the calculation of multiple cracks in thin structures, German Aerospace Congress(DGLR-Jahrestagung) (1995), pp.905-913.

[9] R. de Wit, R.J. Fields, S. R. Low, D.E. Harne and T. Foecke: Fracture testing of large-scale thin-sheet aluminium alloy. NIST report NISTIR 5661 (1995).