A continuous aramid fiber-reinforced polycarbonate composite consists of 45 vol% aramid fibers, and has a cross-sectional area of 480 mm2 . The composite is subjected to a longitudinal load of 53,400 N. Modulus of Elasticity (GPa) Tensile Strength (MPa) Density (g/cm3 ) Aramid fiber 131 3600 1.44 Polycarbonate 2.4 65 1.20 1040 steel 207 520 7.85 (a) Calculate the fiber-matrix load ratio. (b) Calculate the actual loads carried by fiber and matrix phases, respectively. (c) Compute the magnitude of the stress on the fiber and matrix phases, respectively. (d) What strain is experienced by the composite? (e) What is the specific gravity of the composite? (f) What is the specific modulus of elasticity in longitudinal direction of the composite? (g) Calculate the percent weight saving with this composite over 1040 steel based on modulus of elasticity.
In an aligned and continuous carbon fiber-reinforced nylon 6,6 composite, the fibers are to carry at least 97% of a load applied in the longitudinal direction. Determine the minimum volume fraction of fibers required. Material Modulus of Elasticity (GPa) Tensile Strength (MPa) Carbon Fiber 260 4000 Nylon 6,6 2.8 76
(a) Compute the voltage at 25C of an electrochemical cell consisting of pure iron immersed in a 2 10-2 M solution of Fe2+ ions, and pure Zn in a 2.5 M solution of Zn 2+ ions. (b) Write the spontaneous electrochemical reaction.
An electrochemical cell is constructed such that on one side a pure Zn electrode is in contact with a solution containing Zn2+ ions at a concentration of 10-2 M. The other cell half consists of a pure Pb electrode immersed in a solution of Pb2+ of 10-4 M concentration. At what temperature will the potential between the two electrode be +0.568 V?
A piece of corroded metal alloy plate was found in a submerged ocean vessel. It was estimated that the original area of the plate was 800 cm2 and that approximately 7.6 kg had corroded away during the submersion. Assuming a corrosion penetration rate of 4 mm/yr for this alloy in seawater, estimate the time of submersion in years. The density of the alloy is 4.5 g/cm3