Chapter 16: Problem 25
(a) What is a hybrid composite? (b) List two important advantages of hybrid composites over normal fiber composites.
Chapter 16: Problem 25
(a) What is a hybrid composite? (b) List two important advantages of hybrid composites over normal fiber composites.
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Get started for free(a) From the moduli of elasticity data in Table \(16.2\) for glass fiber- reinforced polycarbonate com- posites, determine the value of the fiber efficiency parameter for each of 20,30 , and 40 vol\% fibers. (b) Estimate the modulus of elasticity for 50 vol \(\%\) glass fibers.
(a) For a fiber-reinforced composite, the efficiency of reinforcement \(\eta\) depends on fiber length \(l\) according to $$ \eta=\frac{l-2 x}{l} $$ where \(x\) represents the length of the fiber at each end that does not contribute to the load transfer. Make a plot of \(\eta\) versus \(l\) to \(l=50 \mathrm{~mm}\) (2.0 in.), assuming that \(x=1.25 \mathrm{~mm}(0.05 \mathrm{in} .)\). (b) What length is required for a \(0.90\) efficiency of reinforcement?
A large-particle composite consisting of tungsten particles within a copper matrix is to be prepared. If the volume fractions of tungsten and copper are 0.70 and \(0.30,\) respectively, estimate the upper limit for the specific stiffness of this composite given the data that follow. $$\begin{array}{lcc}\hline & \begin{array}{c}\text {Specific} \\\\\text {Gravity}\end{array} & \begin{array}{c}\text {Modulus of} \\\\\text {Elasticity (GPa)}\end{array} \\\\\hline \text { Copper } & 8.9 & 110 \\\\\text { Tungsten } & 19.3 &407 \\\\\hline\end{array}$$.
(a) Verify that Equation 16.11, the expression for the ratio of fiber load to matrix load \(\left(F_{f} / F_{m}\right)\), is valid. (b) What is the \(F_{f} / F_{c}\) ratio in terms of \(E_{f}, E_{m}\), and \(V_{f}\) ?
Briefly describe pultrusion, filament winding, and prepreg production fabrication processes; cite the advantages and disadvantages of each.
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