Fiber-Reinforced CMCs: Processing, mechanical behavior, modeling

Liaw

2007

Metall Mater Trans A

The tensile behavior of Nicalon fiber-reinforced silicon carbide matrix composites (Nicalon/SiC) was investigated with the aid of nondestructive evaluation (NDE) techniques. The NDE techniques include ultrasonic testing (UT), X-ray computed tomography (CT), and infrared (IR) thermography. Before mechanical testing, UT C-scans were developed to investigate defect distributions and to detect variations in the internal flaws. X-ray CT was used to characterize the type of defects and the location of flaws in composites to compare with UT C-scan results. The IR thermography was employed to monitor temperature evolution during tensile testing. This article also investigated the feasibility of using multiple NDE techniques as a means of assessing integrity for Nicalon/SiC composites. Microstructural characterization was performed using scanning electron microscopy (SEM) to investigate failure mechanisms of Nicalon/SiC composites, and the results were compared with NDE data.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tensile Fracture Behavior of Nicalon/SiC Composites

Liaw

2007

Metall Mater Trans A

“…Ceramic matrix composites (CMCs) has been one of the promising materials for high-temperature structural applications [1][2][3]. CMCs provide good corrosion resistance, a good balance of strength and toughness at higher temperatures above 1,000°C, and they are lightweight, as compared to metallic materials.…”

Section: Introductionmentioning

confidence: 99%

NDE Characterization and Mechanical Behavior in Ceramic Matrix Composites

Kwon

2006

KEM

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.

“…Ceramic matrix composites (CMCs) have evolved as a potential candidate material for high-temperature structural applications, including aircraft structures, fusion reactors, and heat-management systems, due to their lightweight, high-temperature, corrosion, and wear resistance, and an excellent balance of toughness and strength, especially, at elevated temperature [1][2][3]. To encourage wide applications of CMCs, nondestructive evaluation (NDE) of CMCs is required for assuring manufacturing quality and lifetime service applications.…”

Section: Introductionmentioning

confidence: 99%

Thermographic Damage Detection of Ceramic Matrix Composites During Tension Testing

Lee

2006

KEM

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.