The Effect of Lüders' Flow on Brittle Fracture Initiation in Pearlitic Steel

Abstract:

Article Preview

In pearlitic steels the fracture initiation of pre-cracked specimens is strongly affected by Lüders’ flow and higher strength properties. There is a gap in fracture toughness data of pre-cracked Charpy (PC) and compact tension (CT) specimens between 60 and 90 MPam1/2 due to plastic hinge formation. The distribution of maximum principal stress ahead of the crack tip in PC specimen loaded into fully plastic regime was found to be identical with that of reference stress-strain field in plane-strain SSY condition. 3D FEM simulations have also shown that there is no constraint loss in PC specimens.

Info:

Periodical:

Materials Science Forum (Volumes 567-568)

Edited by:

Pavel Šandera

Pages:

413-416

Citation:

I. Dlouhý et al., "The Effect of Lüders' Flow on Brittle Fracture Initiation in Pearlitic Steel", Materials Science Forum, Vols. 567-568, pp. 413-416, 2008

Online since:

December 2007

Export:

Price:

$41.00

[1] Jurášek L. Holzmann M. Dlouhý I.: Local approach use at solution of fracture parameters transferability, ECF 17, 2007, Proc. On CD.

DOI: https://doi.org/10.1007/1-4020-4972-2_630

[2] Jurášek L.: The effect of Temperature and Strain Rate on Fracture Behaviour of Steels, PhD thesis, Brno University of Technology (2005).

[3] Hartwig P., New Method for Fracture Toughness Determination on Railway Wheels, Valdunes S.A.S., Unpublished Rpt., (2005).

[4] Ritchie R.O., Knott J.F., Rice J.R. On the relationship between tensile stress and fracture toughness in mild steel. J Mech Phys Solids. 1973; 21: 395-410.

DOI: https://doi.org/10.2172/4442244

[5] Smith E. (1966) The nucleation and growth of cleavage microcracks in mild steel. In: Stickland AC (ed) Physical basis of yield and fracture, Conf. proceedings, Oxford, pp.36-46.

[6] Lindley T.C., Oates G., Richards C.E. (1970) A critical appraisal of carbide cracking mechanism in ferrite /carbide aggregates. Acta Metallurgica 18: 1127 - 1136.

DOI: https://doi.org/10.1016/0001-6160(70)90103-3

[7] Chell G.G., Curry D.A. (1981) Mechanics and mechanisms of cleavage fracture. In: Chell GG (ed) Developments in Fracture Mechanics - 2, Applied Science Publishers, London, p.101.

[8] Lewandowski J.J., Thompson A.W. (1987) Micromechanisms of cleavage fracture in fully pearlitic microstructures. Acta Metallurgica 35: 1453 - 1462.

DOI: https://doi.org/10.1016/0001-6160(87)90091-5

[9] Kavishe FPL, Baker T. J (1986) Cleavage fracture in a eutectoid and hypoeutectoid steel. In: van Elst HC and A. Backer, ECF6, Vol. III. Amsterdam, June 1986. EMAS Ltd., 1721 - 1735.

[10] Chen J.H., Wang Q., Wang G.Z., Li Z (2003) Fracture behaviour at crack tip - a new framework for cleavage mechanism of steel. Acta Materialia 51: 1841 - 1855.

DOI: https://doi.org/10.1016/s1359-6454(02)00581-5