An investigation of thermal barrier coatings on a metal substrate was conducted when the assembly was subjected to both thermal heating and mechanical edge loads generated by interference in adjoining expansion gaps. Both finite element and closed form solution models were developed and compared. The results of the analyses predict that the application of both thermal and mechanical edge loads on the edge of ceramic/metal composites can produce severe local edge spallation in the ceramic coating when an inadequate expansion gap is provided.
1.
Broek, D., 1991, Elementary Engineering Fracture Mechanics, 4th ed., Kluwer Academic Publishers, Boston, MA.
2.
Cannon, R. M., Jayaram, V., Dalgleish, B. J., and Fisher, R. M., 1986, “Fracture Energies of Ceramic-Metal Interfaces,” Ceramic Microstructures ’86—Role of Interfaces, J. A. Pask and A. G. Evans, eds., Plenum Press, New York, pp. 959–968.
3.
Gifford, L. N., 1979, “APES—Finite Element Fracture Mechanics Analysis,” Report DTNSRDC-79/023, David W. Taylor Ship Research and Development Center.
4.
Kokini
K.
Perkins
R. W.
1984
, “Free Edge Thermal Stress Singularities in Finite Concentric Cylinders
,” Computers and Structures
, Vol. 19
, No. 4
, pp. 531
–534
.5.
Kokini
K.
1987
, “Interfacial Cracks in Ceramic-to-Metal Bonds Under Transient Thermal Loads
,” J. Amer. Ceramic Soc.
, Vol. 70
, No. 12
, pp. 855
–859
.6.
Kokini
K.
1988
, “Material Compatibility in Interfacial Transient Thermal Fracture of Ceramic-to-Metal Bonds
,” ASME Journal of Applied Mechanics
, Vol. 55
, pp. 767
–771
.7.
Kuo
An-Yu
1989
, “Thermal Stresses at the Edge of a Bimetallic Thermostat
,” ASME Journal of Applied Mechanics
, Vol. 56
, pp. 585
–589
.8.
Lu
Ming-Che
Erdogan
F.
1983
a, “Stress Intensity Facors in Two Bonded Elastic Layers Containing Cracks Perpendicular to and on the Interface—I
,” Eng. Frac. Mech.
, Vol. 18
, No. 3
, pp. 491
–506
.9.
Nied, H. A., 1991a, “Edge Stress Concentrations in Layered Ceramic-Metal Composites Due to Thermal Mismatch,” Proc. 4th National Thermal Spray Conference, ASM, Metal Park, OH.
10.
Nied, H. A., 1991b, “Edge Stress Intensity Factors in Layered Ceramic-Metal Composites Due to Thermal Mismatch,” Proc. 1991 Intl. Conf. on Failure Analysis, ASM, Metal Park, OH.
11.
Parks, V. J., 1988, “Stresses in a Bonded Wafer,” Experimental Mechanics, Vol. 28, No. 1.
12.
Raju
I. S.
Crews
J. H.
1981
, “Interlaminar Stress Singularities at a Straight Free Edge in Composite Laminates
,” Computers and Structures
, Vol. 14
, No. 1–2
, pp. 21
–28
.13.
Rice, J. R., and Sih, G. C, 1965, “Plane Problems of Cracks in Dissimilar Media,” ASME Journal of Applied Mechanics, pp. 418–423.
14.
Rice
J. R.
1988
, “Elastic Fracture Mechanics Concepts for Interfacial Cracks
,” ASME Journal of Applied Mechanics
, Vol. 55
, pp. 98
–103
.15.
Schwartz, M. M., 1990, CERAMIC JOINING, ASM International, Metal Park, OH.
16.
Thouless
M. D.
Evans
A. G.
Ashby
M. F.
Hutchinson
J. W.
1987
, “The Edge Cracking and Spalling of Brittle Plates
,” Acta Metall.
, Vol. 35
, No. 6
, pp. 1333
–1341
.17.
Thouless
M. D.
Cao
H. C.
Mataga
P. A.
1989
, “Delamination From Surface Cracks in Composite Materials
,” Jour. Material Sci.
, Vol. 24
, pp. 1406
–1412
.18.
Verbeek, A. T. J., 1992, “Plasma Sprayed Thermal Barrier Coatings: Production, Characterization and Testing,” Thesis Eindhoven, ISBN 90 3860082 8, Drukkerji van Deursen bv, Nederweert.
This content is only available via PDF.
Copyright © 1998
by The American Society of Mechanical Engineers
You do not currently have access to this content.
