Lecture - Chapter 16

Lecture - Chapter 16 - CHAPTER 16 COMPOSITES Why Study...

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    CHAPTER 16 CHAPTER 16 COMPOSITES COMPOSITES
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Why Study Composites? With a knowledge of the various types of composites, as well as an understanding of the dependence of their behaviors on the characteristics, relative amounts, geometry/distribution, and properties of the constituent phases, it is possible to design materials having property combinations that are better than those found in the metal alloys, ceramics, and polymeric materials themselves.
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Why Study Composites? For example, composites can be designed to meet the strength requirements of a steel, combined with the corrosion resistance of polymers or the heat resitance of ceramics. Or another example, cement, which has very high compressive strength, can be given a much higher tensile strength by the addition of steel rebar.
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Learning Objectives 1. Name the three main divisions of composite materials, and cite the distinguishing feature of each. 1. Cite the difference in strengthening mechanism for large-particle and dispersion-strengthened particle-reinforced composites. 2. Name the three different types of fiber-reinforced composites on the basis of fiber length and orientation; comment on the distinctive mechanical characteristics for each type.
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Learning Objectives cont. 1. Calculate longitudinal modulus and longitudinal strength for an aligned and continuous fiber- reinforced composite. 2. Compute longitudinal strengths for discontinuous and aligned fiber-reinforced composite materials. 3. Note the three common fiber reinforcements used in polymer-matrix composites, and, for each, cite both desirable characteristics and limitations.
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Learning Objectives cont. 1. Cite the desirable features of metal-matrix composites. 2. Note the primary reason for the creation of ceramic-matrix composites. 3. Name and briefly describe the two sub- classifications of structural composites.
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Constituents of Composite Materials Many composite materials are composed of just two phases; one is termed the matrix, which is continuous and surrounds the other phase, often called the dispersed phase. The properties of composites are a function of the properties of the constituent phases, their relative amounts, and the geometry of the dispersed phase.
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Classification of Composite Materials One simple scheme for the classification of composite materials is shown in Figure 16.2, which consists of three main divisions —particle-reinforced, fiber-reinforced, and structural composites; also, at least two subdivisions exist for each.
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Fig 16.2 A classification scheme for the various composite types discussed in this chapter.
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Particle-Reinforced Composites Large-particle and dispersion-strengthened composites are the two sub-classifications of particle-reinforced composites. Large-particle Composites - the distinction
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This note was uploaded on 05/03/2010 for the course ME 250-750 taught by Professor Signer during the Summer '10 term at Wichita State.

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Lecture - Chapter 16 - CHAPTER 16 COMPOSITES Why Study...

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