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This book investigates the time-dependent behavior of
fiber-reinforced ceramic-matrix composites (CMCs) at elevated
temperatures. The author combines the time-dependent damage
mechanisms of interface and fiber oxidation and fracture with the
micromechanical approach to establish the relationships between the
first matrix cracking stress, matrix multiple cracking evolution,
tensile strength, tensile stress-strain curves and tensile fatigue
of fiber-reinforced CMCs and time. Then, using damage models of
energy balance, the fracture mechanics approach, critical matrix
strain energy criterion, Global Load Sharing criterion, and
hysteresis loops he determines the first matrix cracking stress,
interface debonded length, matrix cracking density, fibers failure
probability, tensile strength, tensile stress-strain curves and
fatigue hysteresis loops. Lastly, he predicts the time-dependent
mechanical behavior of different fiber-reinforced CMCs, i.e., C/SiC
and SiC/SiC, using the developed approaches, in order to reduce the
failure risk during the operation of aero engines. The book is
intended for undergraduate and graduate students who are interested
in the mechanical behavior of CMCs, researchers investigating the
damage evolution of CMCs at elevated temperatures, and designers
responsible for hot-section CMC components in aero engines.
This book focuses on the damage, fracture and fatigue of
ceramic-matrix composites. It investigates tensile damage and
fracture, fatigue hysteresis, and the properties of interfaces
subjected to cyclic fatigue loading. Further, it predicts fatigue
life at room and elevated temperatures using newly developed damage
models and methods, and it analyzes and compares damage, fracture
and fatigue behavior of different fiber performs: unidirectional,
cross-ply, 2D and 2.5D woven. The developed models and methods can
be used to predict the damage and lifetime of ceramic-matrix
composites during applications on hot section
components.Ceramic-matrix composites (CMCs) are high-temperature
structural materials with the significant advantages of high
specific strength, high specific modulus, high temperature
resistance and good thermal stability, which play a crucial role in
the development of high thrust weight ratio aero engines. The
critical nature of the application of these advanced materials
makes comprehensive characterization a necessity, and as such this
book provides designers with essential information pertaining not
only to the strength of the materials, but also to their fatigue
and damage characteristics.
This book presents the relationships between tensile damage and
fracture, fatigue hysteresis loops, stress-rupture, fatigue life
and fatigue limit stress, and stochastic loading stress.
Ceramic-matrix composites (CMCs) possess low material density
(i.e., only 1/4 - 1/3 of high-temperature alloy) and
high-temperature resistance, which can reduce cooling air and
improve structure efficiency. Understanding the failure mechanisms
and internal damage evolution represents an important step to
ensure reliability and safety of CMCs. This book investigates
damage and fracture of fiber-reinforced ceramic-matrix composites
(CMCs) subjected to stochastic loading, including: (1) tensile
damage and fracture of fiber-reinforced CMCs subjected to
stochastic loading; (2) fatigue hysteresis loops of
fiber-reinforced CMCs subjected to stochastic loading; (3) stress
rupture of fiber-reinforced CMCs with stochastic loading at
intermediate temperature; (4) fatigue life prediction of
fiber-reinforced CMCs subjected to stochastic overloading stress at
elevated temperature; and (5) fatigue limit stress prediction of
fiber-reinforced CMCs with stochastic loading. This book helps the
material scientists and engineering designers to understand and
master the damage and fracture of ceramic-matrix composites under
stochastic loading.
Ceramic matrix composites (CMCs) can withstand higher temperatures,
reduce cooling airflow, improve turbine efficiency, and greatly
reduce structural mass compared to the high temperature alloys.
This book focuses on the matrix first/multiple cracking, crack
opening and closure behavior in CMCs at high temperatures. While
conducting in-situ experimental observations to analyze the damage
mechanisms and failure modes, the author develops micromechanical
damage models and constitutive models to predict the first matrix
cracking stress, multiple matrix cracking density, matrix crack
opening displacement, and cracking closure stress at high
temperatures. The effects of composite’s constituent properties,
stress level, and ambient temperature on matrix cracking, opening,
and closure are also discussed. This book will help material
scientists and engineering designers to understand and master the
matrix cracking and closure behavior of fiber-reinforced CMCs.
This book focuses on the vibration behavior of ceramic-matrix
composites (CMCs), including (1) vibration natural frequency of
intact and damaged CMCs; (2) vibration damping of CMCs considering
fibers debonding and fracture; (3) temperature-dependent vibration
damping of CMCs; (4) time-dependent vibration damping of CMCs; and
(5) cyclic-dependent vibration damping of CMCs. Ceramic-matrix
composites (CMCs) possess low material density (i.e., only 1/4 or
1/3 of high-temperature alloy) and high-temperature resistance,
which can reduce cooling air and improve structure efficiency.
Understanding the failure mechanisms and internal damage evolution
represents an important step to ensure reliability and safety of
CMCs. Relationships between microstructure, damage mechanisms,
vibration natural frequency, and vibration damping of CMCs are
established. This book helps the material scientists and
engineering designers to understand and master the vibration
behavior of CMCs at room and elevated temperatures.
This book focuses on the matrix cracking behavior in ceramic-matrix
composites (CMCs), including first matrix cracking behavior, matrix
cracking evolution behavior, matrix crack opening and closure
behavior considering temperature and oxidation. The micro-damage
mechanisms are analyzed, and the micromechanical damage models are
developed to characterize the cracking behavior. Experimental
matrix cracking behavior of different CMCs at room and elevated
temperatures is predicted. The book can help the material
scientists and engineering designers to better understand the
cracking behavior in CMCs.
This book focuses on mechanical hysteresis behavior in different
fiber-reinforced ceramic-matrix composites (CMCs), including 1D
minicomposites, 1D unidirectional, 2D cross-ply, 2D plain-woven,
2.5D woven, and 3D needle-punched composites. Ceramic-matrix
composites (CMCs) are considered to be the lightweight
high-temperature materials for hot-section components in
aeroengines with the most potential. To improve the reliability and
safety of CMC components during operation, it is necessary to
conduct damage and failure mechanism analysis, and to develop
models to predict this damage as well as fracture over lifetime -
mechanical hysteresis is a key damage behavior in fiber-reinforced
CMCs. The appearance of hysteresis is due to a composite's internal
damage mechanisms and modes, such as, matrix cracking, interface
debonding, and fiber failure. Micromechanical damage models and
constitutive models are developed to predict mechanical hysteresis
in different CMCs. Effects of a composite's constituent properties,
stress level, and the damage states of the mechanical hysteresis
behavior of CMCs are also discussed. This book also covers damage
mechanisms, damage models and micromechanical constitutive models
for the mechanical hysteresis of CMCs. This book will be a great
resource for students, scholars, material scientists and
engineering designers who would like to understand and master the
mechanical hysteresis behavior of fiber-reinforced CMCs.
This book presents the relationships between tensile damage and
fracture, fatigue hysteresis loops, stress-rupture, fatigue life
and fatigue limit stress, and stochastic loading stress.
Ceramic-matrix composites (CMCs) possess low material density
(i.e., only 1/4 - 1/3 of high-temperature alloy) and
high-temperature resistance, which can reduce cooling air and
improve structure efficiency. Understanding the failure mechanisms
and internal damage evolution represents an important step to
ensure reliability and safety of CMCs. This book investigates
damage and fracture of fiber-reinforced ceramic-matrix composites
(CMCs) subjected to stochastic loading, including: (1) tensile
damage and fracture of fiber-reinforced CMCs subjected to
stochastic loading; (2) fatigue hysteresis loops of
fiber-reinforced CMCs subjected to stochastic loading; (3) stress
rupture of fiber-reinforced CMCs with stochastic loading at
intermediate temperature; (4) fatigue life prediction of
fiber-reinforced CMCs subjected to stochastic overloading stress at
elevated temperature; and (5) fatigue limit stress prediction of
fiber-reinforced CMCs with stochastic loading. This book helps the
material scientists and engineering designers to understand and
master the damage and fracture of ceramic-matrix composites under
stochastic loading.
This book investigates the time-dependent behavior of
fiber-reinforced ceramic-matrix composites (CMCs) at elevated
temperatures. The author combines the time-dependent damage
mechanisms of interface and fiber oxidation and fracture with the
micromechanical approach to establish the relationships between the
first matrix cracking stress, matrix multiple cracking evolution,
tensile strength, tensile stress-strain curves and tensile fatigue
of fiber-reinforced CMCs and time. Then, using damage models of
energy balance, the fracture mechanics approach, critical matrix
strain energy criterion, Global Load Sharing criterion, and
hysteresis loops he determines the first matrix cracking stress,
interface debonded length, matrix cracking density, fibers failure
probability, tensile strength, tensile stress-strain curves and
fatigue hysteresis loops. Lastly, he predicts the time-dependent
mechanical behavior of different fiber-reinforced CMCs, i.e., C/SiC
and SiC/SiC, using the developed approaches, in order to reduce the
failure risk during the operation of aero engines. The book is
intended for undergraduate and graduate students who are interested
in the mechanical behavior of CMCs, researchers investigating the
damage evolution of CMCs at elevated temperatures, and designers
responsible for hot-section CMC components in aero engines.
This book focuses on the damage, fracture and fatigue of
ceramic-matrix composites. It investigates tensile damage and
fracture, fatigue hysteresis, and the properties of interfaces
subjected to cyclic fatigue loading. Further, it predicts fatigue
life at room and elevated temperatures using newly developed damage
models and methods, and it analyzes and compares damage, fracture
and fatigue behavior of different fiber performs: unidirectional,
cross-ply, 2D and 2.5D woven. The developed models and methods can
be used to predict the damage and lifetime of ceramic-matrix
composites during applications on hot section
components.Ceramic-matrix composites (CMCs) are high-temperature
structural materials with the significant advantages of high
specific strength, high specific modulus, high temperature
resistance and good thermal stability, which play a crucial role in
the development of high thrust weight ratio aero engines. The
critical nature of the application of these advanced materials
makes comprehensive characterization a necessity, and as such this
book provides designers with essential information pertaining not
only to the strength of the materials, but also to their fatigue
and damage characteristics.
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