Residual thermal stresses and calculation of the critical metal particle size for interfacial crack extension in metal-ceramic matrix composites

1996 ◽  
Vol 44 (1) ◽  
pp. 279-287 ◽  
Author(s):  
R. Kolhe ◽  
C.Y. Hui ◽  
E. Ustundag ◽  
S.L. Sass
Keyword(s):  
Crack Extension ◽  
Metal Particle ◽  
Thermal Stresses ◽  
Interfacial Crack ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Metal Particle Size ◽  
Critical Metal ◽  
Metal Ceramic

ANALYSIS OF CERAMIC MATRIX COMPOSITES WITH BRIDGING CRACKS IN THE PRESENCE OF CREEP

1998 ◽  
Vol 22 (4B) ◽  
pp. 447-456
Author(s):  
V. Birman ◽  
L.W. Byrd
Keyword(s):  
Thermal Stresses ◽  
Tensile Load ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Effect Of Temperature ◽  
Uniaxial Tensile ◽  
Matrix Composites ◽  
Mechanical Loads ◽  
Aerospace Applications ◽  
Matrix Cracks

Ceramic matrix composites (CMCs) represent an attractive class of materials, particularly in aerospace applications where a combination of thermal and mechanical loads may present a challenge for a designer. An important feature of these materials is their ability to withstand damage without immediate failure. This emphasizes a significance of studies of damaged CMCs, particularly at high temperatures. In particular, the analysis of creep of CMCs with matrix cracks is important to accurately predict the response and reliability of such materials. The solution presented in this paper concentrates on creep in the presence of bridging cracks and uniaxial tensile load. Residual thermal stresses and the effect of temperature on the rate of creep are incorporated into the formulation.

Multiscale Modelling of the Influence of Damage on the Thermal Properties of Ceramic Matrix Composites

2010 ◽  
Vol 73 ◽  
pp. 65-71 ◽  
Author(s):  
Jalal El Yagoubi ◽  
Jacques Lamon ◽  
Jean Christophe Batsale
Keyword(s):  
Thermal Loading ◽  
Interfacial Crack ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Cracking ◽  
Fiber Direction ◽  
Multiple Cracks ◽  
Matrix Composites ◽  
Structural Applications ◽  
The Matrix

Ceramic matrix composites (CMC) are very attractive materials for structural applications at high temperatures. Not only must CMC be damage tolerant, but they must also allow thermal management. For this purpose heat transfers must be controlled even in the presence of damage. Damage consists in multiple cracks that form in the matrix and ultimately in the fibers, when the stresses exceed the proportional limit. Therefore the thermal conductivity dependence on applied load is a factor of primary importance for the design of CMC components. This original approach combines a model of matrix cracking with a model of heat transfer through an elementary cracked volume element containing matrix crack and an interfacial crack. It was applied to 1D composites subject to tensile ant thermal loading parallel to fiber direction in a previous paper. The present paper compares predictions to experimental results.

An Experimental Apparatus and Procedure for the Simulation of Thermal Stresses in Gas Turbine Combustion Chamber Panels Made of Ceramic Matrix Composites

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Larry Lebel ◽  
Sylvain Turenne ◽  
Rachid Boukhili
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Thermal Stresses ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Laboratory Observation ◽  
Experimental Apparatus ◽  
Specimen Test ◽  
Gas Turbine Combustion

This paper presents an experimental procedure developed to simulate the behavior of ceramic matrix composites (CMCs) under the cyclic thermal stresses of a gas turbine combustion chamber. An experimental apparatus was assembled that produces a temperature gradient across the thickness of a CMC specimen while holding the specimen at its two extremities, which simulates the bending stress that would be observed at the center of a combustor panel. Preliminary validation tests were performed in which A-N720 oxide–oxide CMC specimens were heated to a surface temperature of up to 1160 °C using an infrared heater, which allowed for the calibration of heat losses and material thermal conductivity. The specimen test conditions were compared with predicted conditions in generic annular combustor panels made of the same material. Provided that a more powerful heat source is made available to reach sufficiently high temperatures and through-thickness temperature gradients simultaneously, the proposed experiment promises to allow laboratory observation of representative deterioration modes of a CMC inside an actual combustion chamber.

Sign in / Sign up

Export Citation Format

Share Document