Computer Modelling of Crack Propagation in Porous Reactor Core Graphite

Abstract:

Article Preview

This study aims to develop computer models, with a microstructure representative of the PGA graphite, to contribute to the understanding of the relationship between the amount of porosity, the load-displacement behaviour and crack propagation. The project is in two linked parts, the first provides a model of the porous graphite which is then introduced into a lattice type finite element model to provide the load-displacement and crack propagation predictions. Microstructures consisting of matrix and pores with added aligned filler particles, typical of needle coke, were studied. The purpose was to isolate the effect of filler particles on fracture strength and the fracture path. In the paper crack paths and fracture mechanisms are discussed for different amounts of porosity and various filler particle arrangements.

Info:

Periodical:

Key Engineering Materials (Volumes 452-453)

Edited by:

A. Saimoto and M.H. Aliabadi

Pages:

729-732

DOI:

10.4028/www.scientific.net/KEM.452-453.729

Citation:

E. Schlangen et al., "Computer Modelling of Crack Propagation in Porous Reactor Core Graphite", Key Engineering Materials, Vols. 452-453, pp. 729-732, 2011

Online since:

November 2010

Export:

Price:

$35.00

[1] P.J. Heard, R. Moskovic and M.R. Wootton, Study of cracking behaviour of virgin PGA and Gilsocarbon reactor moderator graphite, University of Bristol, Interface Analysis Centre report PJH/IAC/03/09/C02, (2009).

[2] B.T. Kelly, The structure and manufacture of nuclear graphite' in 'Irradiation damage in graphite due to fast neutrons in fission and fusion systems, IAEA-TECDIC-1154, IAEA, (2000).

[3] A. Hodgkins, T.J. Marrow, M.R. Wootton, R. Moskovic and P.E.J. Flewitt, A consideration of the effect of radiolytic oxidation on fracture of reactor core graphites, Securing the safe performance of graphite reactor cores, Nothingham, November 24-26, 2008, in press.

DOI: 10.1039/9781847559999-00171

[4] P.J. Heard, M.R. Wootton, R. Moskovic and P.E.J. Flewitt, Crack initiation and propagation in Pile Grade A (PGA) reactor core graphite under a range of loading conditions, University of Bristol, interface Analysis Centre Report PJH/IAC/10/09/C01, (2009).

DOI: 10.1016/j.jnucmat.2010.03.023

[5] G.M. Hughes, P.J. Heard and M.R. Wootton, Examination of the pore structure of virgin PGA graphite using focussed ion beam microscopy and Amira 3-D reconstruction software, University of Bristol, Interface Analysis Centre Report GMH/IAC/06/07/C01, (2008).

[6] A. Hodgkins, T.J. Marrow, M.R. Wootton, R. Moskovic and P.E.J. Flewitt, Fracture behaviour of radiolytically oxidised reactor core graphites: a view, Material Science and Technology, 2010, in press.

DOI: 10.1179/026708309x12526555493477

[7] A.Y. Yaghi, T.H. Hyde, A.A. Becker and G. Walker, The integrity of graphite blocks in nuclear reactors, University of Nothingham Report, GRA/AHY/040806, August (2004).

[8] B.T. Kelly, Physics of graphite, Applied Science (London), (1981).

[9] B.L. Karihaloo, Fracture mechanics and structural concrete, Longmans Scientific and Technical (Harrow), (1995).

[10] E. Schlangen and E. J. Garboczi, Fracture simulations of concrete using lattice models: Computational aspects, Eng. Fracture Mech. 57 (1997) 319-332.

DOI: 10.1016/s0013-7944(97)00010-6

[11] E. Schlangen, Crack development in concrete, Part 1: fracture experiments and CT scan observations, in advances in fracture and damage mechanics VII, Key Engineering Materials, Vol. 699, 385-388, (2008).

DOI: 10.4028/www.scientific.net/kem.385-387.69

[12] E. Schlangen, E. and Z. Qian. 3D Modeling of fracture in cement-based material, Journal of Multiscale Modelling, Vol. 1, No. 2 (2009), 1-17.

[13] E. Schlangen and J. G. M. van Mier, Experimental and numerical analysis of micromechanisms of fracture of cement-based composites, Cem. Conc. Composites, 14 (1992) 105-118.

DOI: 10.1016/0958-9465(92)90004-f

[14] E. Schlangen, Report: DUT_CiTG_Microlab_GPS-574. 04_5, Delft University, May, (2010).

[15] G. Smith & A. Crocker. Final report GPS0574. 03, University of Surrey, December (2009).

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