tutorial 8 - composite materials

TUTORIAL 8 Composite Materials 1. A unidirectional carbon-fiber-epoxy-resin composite contains 68 percent by volume of carbon fiber and 32 percent epoxy resin. The density of the carbon fiber is 1.79 g/cm 3 and that of the epoxy resin is 1.20 g/cm 3 . (a) What are the weight percentages of carbon fibers and epoxy resin in the composite? (b) What is the average density of the composite? 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. The mechanical characteristics of these two materials are as follows. Also, the stress on the polycarbonate matrix when the aramid fibers fail is 35 MPa. For this composite, compute: a. The longitudinal tensile strength b. The longitudinal modulus of elasticity 3. Assume that the composite described in the Question 2 above has a cross-sectional area of 480 mm 2 and is subjected to a longitudinal load of 53.4 kN. a. Calculate the fiber-matrix load ratio b. Calculate the actual loads carried by both fiber and matrix phases c. Compute the magnitude of the stress on each of the fiber and matrix phases d. What strain is experienced by the composite?

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TUTORIAL 8

Composite Materials

1. A unidirectional carbon-fiber-epoxy-resin composite contains 68 percent by volume of carbon fiber and 32 percent epoxy resin. The density of the carbon fiber is 1.79 g/cm3 and that of the epoxy resin is 1.20 g/cm3. (a) What are the weight percentages of carbon fibers and epoxy resin in the composite? (b) What is the average density of the composite?

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. The mechanical characteristics of these two materials are as follows.

Also, the stress on the polycarbonate matrix when the aramid fibers fail is 35 MPa. For this composite, compute:

a. The longitudinal tensile strengthb. The longitudinal modulus of elasticity

3. Assume that the composite described in the Question 2 above has a cross-sectional area of 480 mm2 and is subjected to a longitudinal load of 53.4 kN.

a. Calculate the fiber-matrix load ratiob. Calculate the actual loads carried by both fiber and matrix phasesc. Compute the magnitude of the stress on each of the fiber and matrix

phasesd. What strain is experienced by the composite?

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