(a) From the moduli of elasticity data in Table 16.2 for glass fiber–reinforced polycarbonate composites 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.
Table 16.2 Properties of Unreinforced and Reinforced Polycarbonates with Randomly Oriented Glass Fibers
|
| Value for Given Amount of Reinforcement (vol%) |
|
|
Property | Unreinforced | 20 | 30 | 40 |
Specific gravity | 1.19–1.22 | 1.35 | 1.43 | 1.52 |
Tensile strength [MPa (ksi)] | 59–62 (8.5–9.0) | 110 (16) | 131 (19) | 159 (23) |
Modulus of elasticity [GPa (106 psi)] | 2.24–2.345 (0.325–0.340) | 5.93 (0.86) | 8.62 (1.25) | 11.6 (1.68) |
Elongation (%) | 90–115 | 4–6 | 3–5 | 3–5 |
Impact strength, notched Izod (lbf/in.) | 12–16 | 2.0 | 2.0 | 2.5 |
Source: Adapted from Materials Engineering’s Materials Selector, copyright © Penton/IPC.
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