声明
摘要
Abstract
Contents
Chapter 1 Introduction
1．1 Brief introduction to composites materials
1．2 Composites for tribological applications
1．2．1 Engineering composite materials
1．2．2 Natural composite materials
1．2．3 Evaluation of the wear of composites
1．3 Numerical simulation of wear
1．3．1 Application of wear simulation
1．3．2 Simulation of wear by numerical methods
1．3．3 Wear laws adopted in numerical application
1．4 Objective and organization
Chapter 2 Analytical estimates of the wear of fiber-reinforced composites
2．1 Introduction
2．2 A micromechanical approach for determining the effective wear
2．3 Estimations for the effective wear of fiber-reinforced composites
2．3．1 Estimation of the load ratios under uniform strain
2．3．2 Estimation of the load ratios under uniform stress
2．3．3 Estimation of the load ratios under uniform frictional stress
2．3．4 Effect of Poisson’s ratio on effective wear compliance
2．3．5 Comparison of effective wear compliances
2．4 Numerical applications and discussions
2．5 Wear estimates of fiber reinforced viscoelastic composites
2．5．1 Constitutive law of fiber and matrix
2．5．2 Numerical example of PTFE-GF composite
2．5．3 Numerical example of biocomposites
2．6 Closing Remarks
Chapter 3 Numerical analysis of the wear of fiber-reinforced composites
3．1 Introduction
3．2 Wear simulation by numerical analysis
3．2．1 Finite element contact model
3．2．2 Wear at nodes of model
3．2．3 Material properties of fiber and matrix phases
3．2．4 Wear of fiber and matrix phases
3．3 Determination of a Representative Surface Element(RSE)
3．3．1 RSE under normal loading
3．3．2 RSE in the case of frictional loading
3．4 Verification of the assumption of theoretical estimates
3．4．1 Load proportion under the normal loading and the sliding with friction
3．4．2 Discrepancy of strain and stress distribution of two phases
3．4．3 Composite wear without variation of contact surface
3．4．4 Composite wear after the variation of contact surface
3．5 Wear analysis of composites reinforced with oblique fibers
3．5．1 Load proportion
3．5．2 Wear volume and wear compliance
3．6 Closed remarks
Chapter 4 Homogenization of elastoplastic particle-reinforced composites
4．1 Introduction
4．2 Constitutive laws for the particle and matrix phases
4．2．1 Elastic properties of the matrix and particles
4．2．2 Mohr-Coulomb and Drucker-Prager yield criteria for the matrix phase
4．2．3 Non-associated flow rule
4．3 Effective elastoplastic behavior of particulate composites under isotropic loading
4．3．1 Micromechanical model
4．3．2 General results
4．3．3 Loading modes
4．4 Porous media under external and internal hydrostatic loading
4．4．1 Constitutive law of matrix
4．4．2 General results
4．5 Numerical applications and discussions
4．5．1 Elastoplastic behavior of particle-reinforced composites or porous mediaunder isotropic loading
4．5．2 Porous media subjected to the extemal and intemal hydrostatic loading
4．6 Concluding remarks
Chapter 5 Homogenization of elastoplastic the fiber-reinfoced composite under radial loading
5．1 Introduction
5．2 Local constitutive laws
5．3 Micromechanical model
5．4 General results
5．4．1 Initial plastification
5．4．2 Elastoplastic stage
5．4．3 Total plastification
5．5 Elastoplastic behavior of composite with von Mises matrix
5．6 Numerical examples
5．7 Closing remarks
Chapter 6 Wear estimates of the fiber-reinforced composite with elsatoplastic matrix
6．1 Introduction
6．2 Local constitutive laws
6．3 Preliminary results
6．3．1 Elastic stage
6．3．2 Elastoplastic stage
6．3．3 Total plastification
6．4 Numerical application
6．5 Closing remarks
Conclusion
Acknowledgements
Appendix
Reference
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