14_440_407Homework7

14_440_407Homework7 - 1 Rutgers University School of...

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Rutgers University 14-440:407 School of Engineering Mechanical Properties of Materials Dept. of Materials Science & Engineering HOMEWORK #7 1. For a fiber-reinforced composite, (a) list three functions of the matrix phase; (b) compare the desired mechanical characteristics of matrix and fiber phases; and (c) cite two reasons why there must be a strong bond between fiber and matrix at their interface. 2. A continuous and aligned fiber-reinforced composite is to be produced consisting of 45 vol% aramid fibers and 55 vol% of a polycarbonate matrix: mechanical characteristics of these two materials are as follows: Modulus of Elasticity [psi (MPa)] Tensile Strength [psi (MPa)] Aramid fiber Polycarbonate 19 x 10 6 (1.3 x 10 5 ) 3.5 x 10 5 (2.4 x 10 3 ) 500,000 (3500) 8000 (55) For this composite, compute (a) the longitudinal tensile strength, and (b) the longitudinal modulus of elasticity. 3. (a) Cite several reasons why fiberglass-reinforced composites are utilized extensively. (b)
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14_440_407Homework7 - 1 Rutgers University School of...

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