Micromechanical Modeling of Grain Boundary Resistance to Cleavage Fracture Propagation


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A micromechanical model representing two adjacent grains is developed. Rapid crack propagation from one grain into another driven by a constant global stress state is simulated. The normal of the crack face in the grain where the micro-crack initiates coincides with the principle loading direction. In the adjacent grain, the propagation direction changes and separation occurs in a mixed way, involving both normal and shear separation. The largest grain size that can arrest a rapidly propagating micro-crack is defined as the critical grain size. The effects of the global stress state and temperature on the critical grain size is examined. The influence of the mismatch in lattice orientation between two neighboring grains is qualitatively described. The influence of temperature is modeled by a temperature dependent viscoplastic response.



Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim




M. Stec and J. Faleskog, "Micromechanical Modeling of Grain Boundary Resistance to Cleavage Fracture Propagation", Key Engineering Materials, Vols. 345-346, pp. 825-828, 2007

Online since:

August 2007




[1] Kroon M., and Faleskog J., 2005. Micromechanics of cleavage fracture initiation in ferritic steels by carbide cracking. Journal of the mechanics and physics of solids 53, 171-196.

DOI: 10.1016/j.jmps.2004.05.008

[2] Kroon M., and Faleskog J., 2003. Influence of carbide/ferrite interface and carbide shape on cleavage fracture initiation in ferritic steels. Report 343, KTH Solid Mechanics, Stockholm, Sweden.

DOI: 10.1016/j.mechmat.2008.03.006

[3] Qiao Y. Argon A.S., 2003. Cleavage cracking resistance of high angle grain boundaries in Fe3%wt. Si alloy. Mechanics of materials 35, 313-331.

DOI: 10.1016/s0167-6636(02)00284-3

[4] QiaoY., Argon A.S., 2003. Cleavage crack-growth-resistance of grain boundaries in polycrystalline Fe-2%Si alloy: experiments and modelling. Mechanics of materials 35, 129154.

DOI: 10.1016/s0167-6636(02)00194-1

[5] Melin S., 1994. Accurate data for stress intensity factors at infinitesimal kinks. Journal of applied mechanics 61, 467-470.

DOI: 10.1115/1.2901468

[6] Stec M., Faleskog J., Micromechanical modeling of grain boundary resistance to cleavage crack propagation in ferritic steels. Work in progress. To be published in (2007).

DOI: 10.1007/s10704-009-9415-7

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