Long-Term Creep and Creep Rupture Behavior of Woven Ceramic Matrix Composites at Elevated Temperatures

Materials ◽  
2004 ◽  
Author(s):  
Siarajus Salekeen ◽  
Mohammad M. Rahman ◽  
Hassan Mahfuz ◽  
Shaik Jeelani
Keyword(s):  
Matrix Composite ◽  
Creep Behavior ◽  
Elevated Temperatures ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Test System ◽  
Creep Rupture ◽  
Tensile Creep ◽  
Matrix Composites ◽  
Stress Levels

The strong interest in ceramic matrix composite for high temperature application arises primarily from their ability to retain good creep behavior. The objective of this work is to investigate the creep behavior of quasi-isotropic woven silicon carbide fabric reinforced silicon-nitrogen-carbon (SiC/SiNC) ceramic composite at stress levels which are above and below the monotonic proportional limit strength. Constant-load tensile creep-rupture tests were performed on SiC/SiNC ceramic matrix composite on an Instron 8502 material test system. The creep behavior of SiC/SiNC matrix composites were investigated at various temperatures (700°C and 1000°C) and stress levels (55%, 65% of ultimate strength, σult). The strain vs. time curves consisted of primary and secondary (steady state) creep regions were established. The stress exponent and activation energy of SiC/SiNC ceramic matrix composite were also determined at these temperatures. The creep data followed the traditional power law exhibiting an exponential relationship between creep rate and stress.

A Review of Failure Models for Ceramic Matrix Composite Laminates Under Monotonic Loads

1990 ◽  
Vol 112 (4) ◽  
pp. 492-501 ◽  
Author(s):  
D. E. Tripp ◽  
J. H. Hemann ◽  
J. P. Gyekenyesi
Keyword(s):  
Matrix Composite ◽  
Composite Laminates ◽  
Damage Mechanics ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Failure Models ◽  
Monotonic Loads ◽  
Semi Empirical

Ceramic matrix composites offer significant potential for improving the performance of turbine engines. In order to achieve their potential, however, improvements in design methodology are needed. In the past most components using structural ceramic matrix composites were designed by “trial and error” since the emphasis on feasibility demonstration minimized the development of mathematical models. To understand the key parameters controlling response and the mechanics of failure, the development of structural failure models is required. A review of short-term failure models with potential for ceramic matrix composite laminates under monotonic loads is presented. Phenomenological, semi-empirical, shear-lag, fracture mechanics, damage mechanics, and statistical models for the fast fracture analysis of continuous fiber unidirectional ceramic matrix composites under monotonic loads are surveyed.

scholarly journals Oxide Ceramic Matrix Composite Materials for Aero-Engine Applications: A Literature Review

2021 ◽  
Author(s):  
George Karadimas ◽  
Konstantinos Salonitis ◽  
Konstantinos Georgarakis
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Gas Turbine ◽  
Matrix Composite ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix ◽  
Turbine Engines ◽  
Oxide Ceramic ◽  
Matrix Composites ◽  
Gas Turbine Engines

The development of aircraft gas turbine engines has extensively been required for the development of advanced materials. This complex development process is however justified by the system-level benefits in terms of reduced weight, higher temperature capability, and/or reduced cooling, each of which increases efficiency. This is where high-temperature ceramics have made considerable progress and ceramic matrix composites (CMCs) are in the foreground. CMCs are classified into non-oxide and oxide-based ones. Both families have material types that have a high potential for use in high-temperature propulsion applications. Typical oxide-based ones are based on an oxide fiber and oxide matrix (Ox-Ox). Some of the most common oxide subcategories, are alumina, beryllia, ceria, and zirconia ceramics. Such matrix composites are used for example in combustion liners of gas turbine engines and exhaust nozzles. However, until now a thorough study on the available oxide-based CMCs for such applications has not been presented. This paper focus on assessing a literature survey of the available oxide ceramic matrix composite materials in terms of mechanical and thermal properties.

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