NDE Characterization and Mechanical Behavior in Ceramic Matrix Composites

2006 ◽  
Vol 321-323 ◽  
pp. 946-951 ◽  
Author(s):  
Jeong Guk Kim ◽  
Sung Tae Kwon ◽  
Won Kyung Kim
Keyword(s):  
Mechanical Behavior ◽  
Nondestructive Evaluation ◽  
Tensile Testing ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Matrix Composites ◽  
Ir Camera ◽  
Qualitative Relationship ◽  
Microscopy Characterization

Several nondestructive evaluation (NDE) techniques, including ultrasonic C-scan, X-ray computed tomography (CT), and infrared (IR) thermography, were employed on ceramic matrix composites (CMCs) to illustrate defect information that might effect mechanical behavior and to analyze structural performance of CMCs. Prior to tensile testing, through C-scan and CT analyses results, the qualitative relationship between the relative ultrasonic transmitted amplitude and porosity based on CT was exhibited. An IR camera was used for in-situ monitoring of progressive damages and to determine temperature changes during tensile testing. Moreover, scanning-electron microscopy characterization was used to perform microstructural failure analyses. This paper describes the use of nondestructive evaluation (NDE) techniques to facilitate the understanding of tension behavior of CMCs.

Damage Characterization of Ceramic Matrix Composites (CMCs) during Tensile Testing

2005 ◽  
Vol 297-300 ◽  
pp. 2533-2538 ◽  
Author(s):  
Jeong Guk Kim ◽  
Jong Duk Chung ◽  
Joon Hyun Lee ◽  
Yeon Uk Jeong ◽  
Yong Ki Hong ◽  
...  
Keyword(s):  
Tensile Testing ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Flash Method ◽  
Measured Temperature ◽  
Matrix Composites ◽  
Ir Camera ◽  
Temperature Changes ◽  
Damage Characterization

Nondestructive evaluation (NDE) techniques were used for the tensile damage characterization in ceramic matrix composites (CMCs). Ultrasonic testing (UT) and infrared (IR) thermography were employed to assess defects and/or damage evolution before and during mechanical testing. Prior to tensile testing, a UT C-scan and a xenon flash method were performed to obtain initial defect information in light of UT C-scans and thermal diffusivity maps, respectively. An IR camera was used for in-situ monitoring of progressive damages. The IR camera measured temperature changes during tensile testing. This paper has presented the feasibility of using NDE techniques to interpret structural performance of CMCs.

Thermographic Damage Detection of Ceramic Matrix Composites During Tension Testing

2006 ◽  
Vol 321-323 ◽  
pp. 825-830 ◽  
Author(s):  
Joon Hyun Lee ◽  
Jeong Guk Kim
Keyword(s):  
Tensile Testing ◽  
Ceramic Matrix Composites ◽  
Microstructural Characterization ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Fracture Mechanisms ◽  
Matrix Composites ◽  
Ir Camera ◽  
Calcium Aluminosilicate ◽  
Tension Testing

The fracture behavior of Nicalon fiber reinforced calcium aluminosilicate (CAS) glass-ceramic matrix composites (Nicalon/CAS) was investigated with the aid of a nondestructive evaluation (NDE) technique. Infrared (IR) thermography was employed for unidirectional Nicalon/CAS composite specimens. During tensile testing, an IR camera was used for in-situ monitoring of progressive damages of Nicalon/CAS samples. The IR camera provided the temperature changes during tensile testing. Microstructural characterization using scanning electron microscopy (SEM) was performed to investigate the fracture mechanisms of Nicalon/CAS composites. In this investigation, the thermographic NDE technique was used to facilitate a better understanding of the fracture mechanisms of the Nicalon/CAS composites during tensile testing.

Analysis of Heat Generation during Fracture in Ceramic Matrix Composites

2008 ◽  
Vol 385-387 ◽  
pp. 689-692 ◽  
Author(s):  
Jeong Guk Kim
Keyword(s):  
High Temperature ◽  
Heat Generation ◽  
Damage Evolution ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
In Situ Monitoring ◽  
Potential Candidate ◽  
Matrix Composites ◽  
Ir Camera ◽  
Structural Applications

Ceramic matrix composites (CMCs) have evolved as potential candidate materials for high-temperature structural applications due to lightweight, high-temperature strength and excellent corrosion and wear resistance. In this investigation, damage evolution and heat generation of CMCs during monotonic loadings were investigated using different types of nondestructive evaluation (NDE) techniques, such as acoustic emission (AE) and infrared (IR) thermography and microstructural characterization. IR camera was used for in-situ monitoring of temperature evolution, and the temperature changes during testing were measured. A significant temperature increase has been observed at the time of failure. Microstructural characterizations using scanning electron microscopy (SEM) were performed to investigate fracture behavior of CMC samples. In this investigation, the NDE technique and SEM characterization were employed to analyze damage evolution and progress of ceramic matrix composites during monotonic loading.

Fracture Behavior of Ceramic Matrix Composites during Monotonic and Cyclic Loadings

2007 ◽  
Vol 345-346 ◽  
pp. 649-652 ◽  
Author(s):  
Jeong Guk Kim ◽  
Peter K. Liaw
Keyword(s):  
Fracture Behavior ◽  
Glass Ceramics ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Cyclic Fatigue ◽  
In Situ Monitoring ◽  
Matrix Composites ◽  
Ir Camera ◽  
Temperature Changes ◽  
Ceramics Matrix

The fracture behavior of ceramic matrix composites (CMCs) was investigated using the infrared (IR) thermography nondestructive evaluation (NDE) technique during monotonic and cyclic loadings. The CMCs used for this investigation are continuous Nicalon (silicon carbide fiber) fiber reinforced calsium aluminosilicate (CAS) glass-ceramics matrix composites. During monotonic tension and cyclic fatigue loadings, IR camera was used for in-situ monitoring of temperature evolution, and the temperature changes during testing were measured. Microstructural characterizations using scanning electron microscopy (SEM) were performed to investigate fracture modes and failure mechanisms of Nicalon/CAS samples. In this investigation, the NDE technique and SEM characterization were employed to facilitate a better understanding of damage evolution and progress of Nicalon/CAS composites during monotonic and cyclic loadings.

Ceramic Matrix Composite Materials for Engine Exhaust Systems on Next-Generation Vertical Lift Vehicles

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
Michael J. Walock ◽  
Vann Heng ◽  
Andy Nieto ◽  
Anindya Ghoshal ◽  
Muthuvel Murugan ◽  
...  
Keyword(s):  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Thermal Exposure ◽  
Gas Flows ◽  
Matrix Composites ◽  
Engine Exhaust ◽  
Ir Camera ◽  
Before And After ◽  
Ceramic Components

Future gas turbine engines will operate at significantly higher temperatures (∼1800 °C) than current engines (∼1400 °C) for improved efficiency and power density. As a result, the current set of metallic components (titanium-based and nickel-based superalloys) will be replaced with ceramics and ceramic matrix composites (CMCs). These materials can survive the higher operating temperatures of future engines at significant weight savings over the current metallic components, i.e., advanced ceramic components will facilitate more powerful engines. While oxide-based CMCs may not be suitable candidates for hot-section components, they may be suitable for structural and/or exhaust components. However, a more thorough understanding of the performance under relevant environment of these materials is needed. To this end, this work investigates the high-temperature durability of a family of oxide–oxide CMCs (Ox–Ox CMCs) under an engine-relevant environment. Flat Ox–Ox CMC panels were cyclically exposed to temperatures up to 1150 °C, within 240 m/s (∼0.3 M) gas flows and hot sand impingement. Front and backside surface temperatures were monitored by a single-wavelength (SW) pyrometer and thermocouple, respectively. In addition, an infrared (IR) camera was used to evaluate the damage evolution of the samples during testing. Flash thermography nondestructive evaluation (NDE) was used to elucidate defects present before and after thermal exposure.

Sign in / Sign up

Export Citation Format

Share Document