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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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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(a) Briefly describe sandwich panels. (b) What is the prime reason for fabricating these structural composites? (c) What are the functions of the faces and the core?
Compute the longitudinal strength of an aligned carbon fiber-epoxy matrix composite having a \(0.20\) volume fraction of fibers, assuming the following: (1) an average fiber diameter of \(6 \times 10^{-3} \mathrm{~mm}\left(2.4 \times 10^{-4}\right.\) in. \(),(2)\) an average fiber length of \(8.0 \mathrm{~mm}(0.31\) in. \(),(3)\) a fiber fracture strength of \(4.5\) GPa \(\left(6.5 \times 10^{5} \mathrm{psi}\right),(4)\) a fibermatrix bond strength of \(75 \mathrm{MPa}(10,900 \mathrm{psi}),(5)\) a matrix stress at composite failure of \(6.0 \mathrm{MPa}\) (870 psi), and (6) a matrix tensile strength of 60 MPa \((8700\) psi).
For a glass fiber-epoxy matrix combination, the critical ratio of fiber length to fiber diameter is 40. Using the data in Table 16.4, determine the fiber- matrix bond strength.
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) What is the distinction between cement and concrete? (b) Cite three important limitations that restrict the use of concrete as a structural material. (c) Briefly explain three techniques that are used to strengthen concrete by reinforcement.
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