Abstract
The elastodynamic response of a columnar thermal barrier coating to normal impact by a spherical particle is explored using an explicit finite element method. The transient stress state involves a tensile component at the edge of each column, and this may lead to erosion. The contact problem can be simplified to the impact of a single column by an inclined wedge. The peak tensile stress is determined as a function of geometry of column and level of friction between wedge and columns. The initiation of a crack from a pre-existing flaw within the column is explored. The implications of the various calculations are discussed for erosion of thermal barrier coatings.
References
[1] R.A.Miller: J. Am. Ceram Soc.67 (1984) 517–524. Search in Google Scholar
[2] J.A.Ruud, A.Bartz, M.P.Borom, C.A.Johnson: J. Am. Ceram Soc.84 (2001) 1545–1552. Search in Google Scholar
[3] A.G.Evans, D.R.Mumm, J.W.Hutchinson, G.H.Meier, F.S.Pettit: Prog. Mater. Sci.46 (2001) 505–553. Search in Google Scholar
[4] A.M.Karlsson, J.W.Hutchinson, A.G.Evans: J. Mech. Phys. Solids50 (2002) 1565–1589. Search in Google Scholar
[5] D.R.Mumm, A.G.Evans, I.T.Spitsberg: Acta Mater.49 (2001) 2329–2340. Search in Google Scholar
[6] S.R.Choi, J.W.Hutchinson, A.G.Evans: Mech. of Mater.31 (1999) 431–447. Search in Google Scholar
[7] P.K.Wright, A.G.Evans: Curr. Opinion in Sol. State Mater. Sci.4 (1999) 255–268. Search in Google Scholar
[8] X.Chen, R.Wang, N.Yao, A.G.Evans, J.W.Hutchinson, R.W.Bruce: Mater. Sci. Eng. A352 (2003) 221–231. Search in Google Scholar
[9] J.R.Nicholls, M.J.Deakin, D.S.Rickerby: Wear233 (1999) 352–361. Search in Google Scholar
[10] R.G.Wlmann, J.R.Nicholls: Wear242 (2000) 89–96. Search in Google Scholar
[11] X.Chen, M.Y.He, I.Spitsberg, N.A.Fleck, J.W.Hutchinson, A.G.Evans: Wear256 (2004) 735–746. Search in Google Scholar
[12] X.Chen, J.W.Hutchinson, A.G.Evans: Acta Mater.52 (2004) 565–571. Search in Google Scholar
[13] A.G.Evans, N.A.Fleck, S.Faulhaber, N.Vermaak, M.Maloney, R.Darolia: Wear260 (2006) 886–894. Search in Google Scholar
[14] R.G.Welmann, M.J.Deakin, J.R.Nicholls: Wear258 (2005) 349–356. Search in Google Scholar
[15] K.L.Johnson: Contact Mechanics. Cambridge University Press1985. Search in Google Scholar
[16] L.B.Freund: Dynamic Fracture mechanics. Cambridge University Press1990. Search in Google Scholar
[17] J.Cole, J.Huth: J. Appl. Mech.25 (1958) 433–436. Search in Google Scholar
[18] J.W.Craggs, A.M.Roberts: J. Appl. Mech.34 (1967) 207–209. Search in Google Scholar
[19] L.M.Brock, H.G.Georgiadis: J. Thermal Stresses23 (2000) 629–656. Search in Google Scholar
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