Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 14, Problem 6ETSQ
To determine
The composite material that could be recycled by melting the shredded composite and form recycled pellets with uniform properties.
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A fiberglass composite consists of epoxy matrix reinforced with randomly oriented and uniformly distributed E-glass fibers. The moduli of elasticity of the glass fibers and the epoxy are 10 * 106 psi and 1 * 106 psi, respectively.Calculate the modulus of elasticity of the fiberglass if the volume percentage of fibers is (a) 30%, (b) 50%, and (c) 70%. Plot a graph showing the relationship between the modulus of elasticity of the fiberglass and the percent of fibers. Comment on the effect of the percent of glass fibers on the modulus of elasticity of fiberglass.
Find the centroid of the following composite object................
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Materials Science And Engineering Properties
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- Which one of the following reinforcing geometries offers the greatest potential for improving strength and stiffness in the resulting composite material? a) flakes. Ob) particles. O c) discontinuous fibers. O d) continuous fibersarrow_forwardA composite sample of carbon reinforced epoxy has dimensions of in 20 in x 20 in x 0.135 in and mass of 3 lb. The carbon fibres have a modulus of elasticity of 80(106) lb/in2 and a density of 0.15 lb/in3. The epoxy matrix has modulus of elasticity of 0.90(106) lb/in2 and a density of 0.05 lb/in3. Assume there are no voids in the sample, calculate the volume fraction of: (i) The carbon fibres (ii) The epoxy matrix in the sample.arrow_forwardAn epoxy is randomly reinforced with E-Glass fibers with 0.0012 in. diameter, 0.5 in. length, 0.5 * 106 psi ultimate tensile strength, and 7.2 ksi shear strength. Does this fiber length fully strengthen the composite? What is the minimum fiber length that would make the composite continuously reinforced?arrow_forward
- A composite bar consist of two materials aluminum and steel is rigidly attached to the fixed supports at (80 degree C) as shown in Figure. If the ends do not yield, find the stresses in the two materials of the bar when the temperature of the composite bar falls to (20 degree C). Es = 200 GPa, Ea = 70 GPa, as = %3D 11.7*10^-6 /C, aal = 23.4*1O^-6 /C, As= 275 mm^2, Aal = 450 mm^2. Al STEEL + 500 mm-+ m→|<- 900 mmarrow_forwardA composite containing carbon fibres in epoxy resin is loaded in a direction perpendicular to the reinforcing fibres. If there are 0.55 vol% fibres, modulus of the carbon fibres is 380 GPa and modulus of epoxy is 3 GPa, determine the modulus of the composite. What it the modulus of the composite? Select one: a. 6.1 GPa b. 5.4 GPa c. 6.6 GPa d. 7.2 GPaarrow_forwardplease answer these two question 1.Explain the reason that flexural modulus of elasticity and compression test modulus of elasticity must be considered separately when both the flexural test and the parallel to grain compressive test caused normal stresses parallel to the grain of the wood. 2. Discuss the difference between isotropic and orthotropic materials for wood.arrow_forward
- A continuous and aligned glass fibre-reinforced composite consisting of 40 vol% of glass fibres having a modulus of elasticity of 69 GPa and 60 vol% of a polyester resin that, when hardened, displays a modulus of 3.4 GPa. Compute the elastic modulus of the composite material in the longitudinal direction. Compute the elastic modulus of the composite material perpendicular to the direction of fibre alignmentarrow_forwardanswer quicklyarrow_forwardFor a continuous and oriented fiber-reinforced composite, the moduli of elasticity in the longitudinal and transverse directions are 19.7 and 3.66 GPa (2.8x10 and 5.3x 105 psi), respectively. If the volume fraction of fibers is 0.42, determine the moduli of elasticity of fiber and matrix phases. Em- E₁= i GPa GPaarrow_forward
- (a) In general, which provides better fire performance, carbonate or silicate aggregates? Why? (b) Why does fire design incorporate a load reduction factor (Dfire) = 1.0? (c) Two identical beams (Beam 1 is simply supported, and Beam 2 is fully restrained) are heated under similar conditions. What does the mechanical strain equal to in each of these beams? (d) A design office located in Clemson, SC (with a branch in San Francisco, CA) envisions designing a new composite member made of steel and timber. This to-be designed member is expected to be used in wildfire-prone regions primarily for single family homes. Comment on how you would design such a member to achieve superior fire performance. (e) Plot and discuss the expected degradation faces in three bending elements (say, beams) to be made from concrete, steel and timber?arrow_forwardBreifly explain Physical Properties of Fiber-Reinforced Composite Round Rods and Bars.arrow_forwardQ.2 The weight fraction of glass in a glass/epoxy composite is 0.8. If the density of glass and epoxy is 2.5 g/cm' and 1.2 g/em', respectively. Find the 1. Density of the composite 2. Fiber and matrix volume fractions 3. The volume of the composite if the mass of the composite is 10 kg 4. Volume and mass of the glass fiber and the epoxy matrix in part (3).arrow_forward
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