tailieunhanh - Materials Selection and Design (2010) Part 14

Tham khảo tài liệu 'materials selection and design (2010) part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The high costs of continuous-fiber composites have driven the development of discontinuous-whisker and even particulate-reinforced composites. The potential performance of these discontinuous composites is much poorer and the mechanism of strengthening may be only partially by fiber reinforcement with the dispersion strengthening being the major effect. Yet silicon-carbide-reinforced aluminum has a significantly higher modulus and strength especially at higher temperatures. Although the normal compressive forming processes can shape the composite the lower ductility and fracture toughness have limited its general application Ref 36 . It is competitive for applications such as snow tire studs which should be wear and corrosion resistant as well as low cost. Properties of Metal-Matrix Composites Metal-matrix composites offer significantly better mechanical properties than polymer-matrix composites for matrix-dominated properties such as greater shear compressive and transverse tensile strengths. Reinforcement can increase the maximum-use temperature over that of the monolithic material. However matrix behavior may not be as good as for the unreinforced matrix. For example the transverse tensile strength of a metal-matrix composite modeled by a matrix with poorly bonded fibers is only about one-third of the strength of the unreinforced matrix. Furthermore the microstructure of the matrix may not be as desirable and together with the physical constraints placed on the fibers by the matrix ductility of the matrix is generally much reduced. Metal-matrix composites also can have good electrical and thermal conductivity. The stress strain behavior of metal-matrix composites is more complicated than resin-matrix composites because of work hardening and the change in the yield surface with different or multiple loading Ref 37 . The same considerations make thermal expansion show hysteresis that changes with cycling. If a residual stress-free metal-matrix composite is loaded

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