Damage Development Upon Creep Test in Ceramic Matrix Composites

2002 ◽  
pp. 179-191
Author(s):  
S. Darzens ◽  
G. Boitier ◽  
J. L. Chermant ◽  
J. Vicens
Keyword(s):  
Creep Test ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Damage Development

Durability and Damage Development in Woven Ceramic Matrix Composites Under Tensile and Fatigue Loading at Room and Elevated Temperatures

2000 ◽  
Vol 122 (4) ◽  
pp. 394-401 ◽  
Author(s):  
A. Haque ◽  
M. Rahman
Keyword(s):  
Elevated Temperature ◽  
Elevated Temperatures ◽  
Failure Strain ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Cracking ◽  
Woven Composites ◽  
Rate Equations ◽  
Matrix Composites ◽  
Damage Development

This paper investigates the damage development in SiC/SiNC woven composites under tensile and cyclic loading both at room and elevated temperatures. The ultimate strength, failure strain, proportional limit, and modulus data at a temperature range of 23°C–1250°C are generated. The tensile strength of SiC/SiNC woven composites has been observed to increase with increased temperatures up to 1000°C. The stress/strain plot shows a pseudo-yield point at 25 percent of the failure strain εf, which indicates damage initiation in the form of matrix cracking. The evolution of damage above 0.25 εf both at room and elevated temperature comprises of multiple matrix cracking, interfacial debonding, and fiber pullout. Although the nature of the stress/strain plot shows damage-tolerant behavior under static loading both at room and elevated temperature, the life expectancy of SiC/SiNC composites degrades significantly under cyclic loading at elevated temperature. This is mostly due to the interactions of fatigue damage caused by the mechanically induced plastic strain and the damage developed by the creep strain. The in-situ damage evolutions are monitored by acoustic event parameters, ultrasonic C-scan, and stiffness degradation. Rate equations for modulus degradation and fatigue life prediction of ceramic matrix composites both at room and elevated temperatures are developed. These rate equations are observed to show reasonable agreement with experimental results. [S0094-4289(00)02304-5]

2D/3D Oxide/Oxide Ceramic Matrix Composites Life Prediction Methods: Virtual Characterization of Mechanical Properties, and Virtual Testing of Structural Component

2007 ◽  
Author(s):  
Frank Abdi ◽  
Dan Thompson
Keyword(s):  
Life Prediction ◽  
Biaxial Tension ◽  
Progressive Failure ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Oxide Ceramic ◽  
Matrix Composites ◽  
Damage Development ◽  
Plane Shear ◽  
Progressive Failure Analysis

Progressive failure analysis (PFA) method was employed to investigate the material and sub-element performances made of Alumina/Alumina (N720/A) ceramic matrix composites (CMC). A numerical material characterization was performed to derive the composite constituent properties based on the tested in-plane tensile and compressive properties of the 2D CMC. The derived constituent properties were then applied to the simulations of the 2D composite other properties including in-plane shear, inter-laminar shear and tension, in-plane bending and biaxial tension. The 3D composite in-plane and inter-laminar tensile behaviors were also predicted using the constituent properties. Finally, the simulation procedure was applied to the life prediction of a sub-element fabricated from the 2D N720/A CMC. The simulation results agreed well with the Siemens test data, which indicates the constituent properties can account for their realistic behaviors in the N720/A CMC. In addition, simulations also provided detailed information of stress fields, damage development and failure mechanisms involved in each specimen.

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