Damping in Fiber Reinforced Composite Materials starts with an introduction to the basic concepts of damping in composite materials. Methods of modeling damping are then covered, along with recent developments in measuring techniques, both local, like polar scanning and global techniques like the Resonalyser method (based on measuring modal damping ratios of composite material plates). The effect of other factors, such as stress, strain-level, stiffness and frequency that need to be considered when determining damping behavior in composite materials are also discussed in detail.
Other chapters present a parametric study of a two-phase composite material using different micromechanical models such as Unified micromechanics, and Hashin and Eshelby’s to predict elastic moduli and loss factors. A bridging model that incorporates the effect of fiber packaging factors is then compared to FEM results. Final sections cover the effect of the interphase on the mechanical properties of the composite, present a nonlinear model for the prediction of damping in viscoelastic materials, and provide practical examples of damping and principles of vibration control.
Author(s): Pramod Kumar, S.P. Singh, Sumit Sharma
Series: Woodhead Publishing Series in Composites Science and Engineering
Publisher: Woodhead Publishing
Year: 2023
Language: English
Pages: 171
City: Cambridge
Title
Half title
Copyright
Contents
Preface
Chapter 1 Introduction
1.1 Objective of the book
1.2 Outline of book
References
Chapter 2 Methods of modeling damping
2.1 Introduction
2.1.1 Different damping mechanisms for composite materials
2.1.2 Methods for damping prediction
2.1.3 Methods for measurement of damping
2.2 Macro mechanical approach
2.2.1 Studies on laminate damping
2.3 Micromechanical approach
2.3.1 Studies on two-phase composites
2.3.2 Studies on three-phase composites
2.3.3 Viscoelastic approach
2.4 Nonlinear damping
2.5 Conclusion
References
Chapter 3 Measurement of damping
3.1 Measurement of damping from decay plot
3.2 A generalized method of finding damping
3.3 Multimode evaluation of damping
3.4 Damping ratio for different modes of deformation
3.5 Resonalyser method of evaluation of damping coefficient matrix
3.6 Frequency dependence of damping
3.7 Concluding remarks
References
Chapter 4 Micromechanical study of two-phase composite
4.1 Micromechanical models
4.1.1 Hashin model
4.1.2 Unified micromechanics
4.1.3 Eshelby's method
4.1.4 Bridging model
4.2 Fiber packing geometry
4.2.1 Types of fiber packing
4.3 Finite element approach
4.3.1 FEM modeling with fiber packing geometry
4.4 Mathematical model for frequency dependence
4.4.1 Mathematical formulation
4.5 Results and discussions
4.5.1 Prediction of strain energy
4.5.2 Effect of fiber volume fraction
4.5.3 Optimization of fiber packing factor ^^ce^^b1 and ^^ce^^b2
4.5.4 Estimation of loss factors with frequency
4.6 Conclusion
References
Chapter 5 Modeling of three phase composite
5.1 Mathematical modeling of three phase composite
5.2 Finite elements model
5.3 Frequency dependence of three phase composite
5.4 Results and discussion
5.4.1 Strain energy variation using FEM
5.4.2 Optimization of fiber packing factor
5.4.3 Effect of frequency
5.5 Conclusion
References
Chapter 6 Modeling of nonlinear damping
6.1 Introduction
6.2 Mathematical model
6.2.1 Hysteresis loops for vibrating systems
6.3 Results and discussions
6.4 Conclusion
References
Chapter 7 Applications of damping and principles of vibration control
7.1 Applications of damping
7.2 Principles of vibration control
7.2.1 Active and passive vibration control for a thin-walled composite beam
7.2.2. Passive control of flutter
7.2.3 Active aeroelastic flutter analysis and vibration control
7.2.4 Active vibration control of the laminated composite beams using velocity feedback control
7.2.5 Active vibration control of composite sandwich plate
References
Index
