Which of the following is the most common matrix material used in fiber-reinforced composites for civil structures? A. Steel B. Epoxy C. Water D. Aluminum
Added by Michael E.
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Step 1: Identify common matrix types used with fibers in civil structure FRPs (fiber-reinforced polymers). Show more…
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A beam is being designed to work immersed in a heated fluid. The beam has to be strong enough to support a load and also be rigid enough so it does not deflect too much. Corrosion resistance is important, so the beam will be electroplated. Heat transfer characteristics are desired for heat dissipation. Five alternative materials have been suggested from which the choice will be made. a) Malleable C.I. ASTM 220 b) Gray C.I. ASTM A48 c) Steel ASTM A36 d) Al 2024 T4 e) Al 6061 T6 Five attributes have been identified, which are: a) Ultimate Strength Su (MPa) b) Elastic Modulus E (GPa) c) Corrosion Resistance 3 = Good, 2 = Fair, 1 = Poor. d) Heat Transfer Ability K (W/m.K) e) Cost Dollars per Kg. Properties estimated for these five materials are as shown in Table 16. Material | Ultimate Strength | Elastic Modulus | Corrosion Resistance | Thermal Conductivity | Cost --- | --- | --- | --- | --- | --- M C.I. ASTM A220 | 580 | 172 | Poor | 40 | 1.6 G C.I. ASTM A48 | 207 | 124 | Poor | 30 | 1.45 Steel ASTM A36 | 550 | 200 | Fair | 150 | 1.0 Al 2024 - T4 | 324 | 73 | Good | 121 | 2.1 Al 6061 - T6 | 310 | 68 | Good | 175 | 2.0 Determine the best material if supporting the weight (strength) is the number one priority followed by rigidity. Cost is more important than the heat transfer. Corrosion resistance is important but the cast iron and steel beams will be electroplated.
Supreeta N.
Which is an alloy made up of iron and carbon and has high compressive and tensile strength? A. glass B. concrete C. steel D. wood
Sri K.
(a) Calculate the specific longitudinal strengths of the glass-fiber, carbon-fiber, and aramid-fiber reinforced epoxy composites in Table $16.5$ and compare them with those of the following alloys: cold-rolled 17-7PH stainless steel, normalized 1040 plain-carbon steel, 7075-T6 aluminum alloy, cold-worked (H04 temper) C26000 cartridge brass, extruded AZ31B magnesium alloy, and annealed Ti- $5 \mathrm{Al}-2.5$ Sn titanium alloy. (b) Compare the specific moduli of the same three fiber-reinforced epoxy composites with the same metal alloys. Densities (i.e., specific gravities), tensile strengths, and moduli of elasticity for these metal alloys are given in Tables B.1, B.4, and B.2, respectively, in Appendix B.
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