It is desired to fabricate a continuous and aligned glass fiber–reinforced polyester having a tensile strength of at least 1400 MPa (200,000 psi) in the longitudinal direction. The maximum possible specific gravity is 1.65. Using the following data, determine whether such a composite is possible. Justify your decision. Assume a value of 15 MPa for the stress on the matrix at fiber failure.
| Specific Gravity | Tensile Strength [GPa (psi)] |
Glass fiber | 2.50 | 3500 (5 × 105) |
Polyester | 1.35 | 50 (7.25 × 103) |
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