Characterization of Fatigue Damage Modes in Nicalon/Calcium Aluminosilicate Composites

Kim, Jeongguk; Liaw, Peter K.

doi:10.1115/1.1836766

Cited by 30 publications

(13 citation statements)

References 18 publications

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“…Until now, there have been many studies on the mechanical properties and failure of ceramic composites, but relatively few studies on the fracture mechanism and detailed fracture process have been carried out [ 10 , 14 , 15 , 16 , 17 , 18 ]. Therefore, in this study, as discussed above, the fracture behavior of the actual ceramic composite material was studied, and a study was conducted on the fracture mechanism that can support the fracture behavior.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Kim

2020

Materials

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Ceramic composite materials have been efficiently used for high-temperature structural applications with improved toughness by complementing the shortcomings of monolithic ceramics. In this study, the fracture characteristics and fracture mechanisms of ceramic composite materials were studied. The ceramic composite material used in this study is Nicalon ceramic fiber reinforced ceramic matrix composites. The tensile failure behavior of two types of ceramic composites with different microstructures, namely, plain-weave and cross-ply composites, was studied. Tensile tests were performed on two types of ceramic composite material specimens. Microstructure analysis using SEM was performed to find out the relationship between tensile fracture characteristics and microstructure. It was found that there was a difference in the fracture mechanism according to the characteristics of each microstructure. In this study, the results of tensile tests, failure modes, failure characteristics, and failure mechanisms were analyzed in detail for two fabric structures, namely, plain-weave and cross-ply structures, which are representative of ceramic matrix composites. In order to help understanding of the fracture process and mechanism, the fracture initiation, crack propagation, and fracture mechanism of each composite material are schematically expressed in a two-dimensional figure. Through these results, it is intended to provide useful information for the design of ceramic composite materials based on the mechanistic understanding of the fracture process of ceramic composite materials.

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Section: Introductionmentioning

confidence: 99%

Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Kim

2020

Materials

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“…Various forms of nondestructive evaluation (NDE) techniques are applied to aid this research [9,10]. Techniques such as acoustic emission, high-speed infrared camera (Infrared Thermography), and ultrasonic testing are commonly used, and acoustic emission and high-speed infrared camera are useful for monitoring various signals generated from specimens during mechanical testing [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Tensile Fracture Behavior and Characterization of Ceramic Matrix Composites

Kim

2019

Materials

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Tensile fracture behavior of ceramic matrix composites (CMCs) was investigated using characterization tools. First, a high-speed infrared camera was used to monitor the surface temperature of the CMC specimen during mechanical testing. An infrared camera is a tool used to detect infrared (IR) radiation emitted from a specimen as a function of temperature, and it was used to analyze the temperature monitoring of specimen surface and fracture behavior during the tensile test. After the test, the microstructural analysis using SEM was performed. SEM analysis was performed to investigate the fracture mode and fracture mechanism of CMC materials. In this paper, it was found that the results of the surface temperature monitoring obtained from IR thermal imaging technology and the failure mode analysis obtained through SEM were in a good agreement. These techniques were useful tools to explain the mechanical behavior of ceramic matrix composites. The detailed experiments and testing results will be provided.

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“…During the cyclic loading, the composite modulus decreases, and the width of stress‐strain hysteresis loop and the residual strain increase. The experimental observation and measurement provide a basis for the investigation of fatigue damage mechanism of fiber‐reinforced CMCs, including, ultrasonic, acoustic emission, scanning electron microscope, surface temperature, electrical resistivity, and the hysteresis measurements . The fatigue hysteresis loops area, that is, the hysteresis dissipated energy, can be used to analyze the internal damage evolution in fiber‐reinforced CMCs under cyclic fatigue loading .…”

Section: Introductionmentioning

confidence: 99%

Mechanical hysteresis and damage evolution in C/SiC composites under fatigue loading at room and elevated temperatures

Reynaud

Fantozzi

2019

Int J Applied Ceramic Tech

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In this paper, the mechanical hysteresis and damage evolution in C/SiC ceramic matrix composites (CMCs) under cyclic tension-tension fatigue loading at room and elevated temperatures in air and in inert atmosphere and different loading frequencies are investigated. The fatigue hysteresis loops models considering multiple matrix cracking modes are developed to establish the relationships between fatigue hysteresis loops, fatigue hysteresis dissipated energy, and fiber/ matrix interface shear stress. The evolution of fatigue hysteresis dissipated energy and interface shear stress vs applied cycles is analyzed. It was found that the interface shear stress degradation rate increases with fatigue peak stress, and loading frequency from 40 to 375 Hz. K E Y W O R D Sceramic matrix composites (CMCs), fatigue, hysteresis loops, interface debonding, interface shear stress, matrix cracking

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Characterization of Fatigue Damage Modes in Nicalon/Calcium Aluminosilicate Composites

Cited by 30 publications

References 18 publications

Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Tensile Fracture Behavior and Characterization of Ceramic Matrix Composites

Mechanical hysteresis and damage evolution in C/SiC composites under fatigue loading at room and elevated temperatures

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