The Effect of a Low Angle Grain Boundary on the Short Fatigue Crack Growth

Abstract:

Article Preview

The influence on the fatigue crack growth behaviour of a short edge crack due to different configurations of a nearby located low angle grain boundary is investigated under quasi-static and plane strain conditions. The geometry is modelled by dislocation dipole elements in a boundary element approach, and the plasticity is modelled by discrete dislocations. The crack is assumed to grow in a single shear mechanism due to nucleation, glide and annihilation of dislocations in the material. It was found that the sign of the dislocations in the grain boundary, the distances between them and the placement of the dislocations in the grain boundary with respect to preferred slip plane directions, all strongly influenced the growth behaviour.

Info:

Periodical:

Edited by:

Pavel Šandera

Pages:

362-365

DOI:

10.4028/www.scientific.net/KEM.465.362

Citation:

P. Hansson and S. Melin, "The Effect of a Low Angle Grain Boundary on the Short Fatigue Crack Growth", Key Engineering Materials, Vol. 465, pp. 362-365, 2011

Online since:

January 2011

Export:

Price:

$38.00

[1] Suresh S.: Fatigue of Materials, second edition. University Press, Cambridge, (1998).

[2] Riemelmoser F.O., Pippan R., Kolednik O.: Cyclic crack growth in elastic plastic solids: a description in terms of dislocation theory. Computational Mechanics, 20: 139-144, (1997).

DOI: 10.1007/s004660050230

[3] Riemelmoser F.O., Pippan R.: Mechanical reasons for plasticity-induced crack closure under plane strain conditions. Fatigue & Fracture of Engineering Materials & Structures, 21: 1425-1433, (1998).

DOI: 10.1046/j.1460-2695.1998.00131.x

[4] Bjerkén C., Melin S.: A study of the influence of grain boundaries on short crack growth during varying load using a dislocation technique. Engineering Fracture Mechanics, 71(15): 2215-2227, (2004).

DOI: 10.1016/j.engfracmech.2003.10.006

[5] Hull, D. and Bacon, D, J. Introduction to Dislocations, fourth edition. Butterworth-Heinemann, (2001).

[6] Askeland, D.R. The Science and Engineering of Materials, third edition. Stanley Thornes (Publishers) Ltd, (1998).

[7] Hansson P., Melin S.: Dislocation-based modeling of the growth of a microstructurally short crack by single shear due to fatigue loading. Int Jnl of Fatigue, 27: 347-356, (2005).

DOI: 10.1016/j.ijfatigue.2004.09.002

[8] Hills D.A., Kelly P.A., Dai D.N., Korsunsky A.M.: Solution of Crack problems: The distributed dislocation technique. Kluwer Academic Publisher, (1996).

[9] Hansson P., Melin S.: Characteristics of short fatigue crack growth in the vicinity of a low angle grain boundary. ESMC 7, Lisbon, Portugal, September 7-11, (2009).

In order to see related information, you need to Login.