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 70 and 6 GPa, respectively. Calculate the modulus of elasticity of the fiberglass if the volume percentage of fibers is (a) 25%, (b) 50%, and (c) 75%. 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.
A fiberglass composite consists of epoxy matrix reinforced with randomly oriented and uniformly distributed E-glass fibers. The modulus of elasticity of the glass fibers and the epoxy are 70 GPa and 6 GPa, respectively. Calculate the modulus of elasticity of the fiberglass if the volume percentage of fibers is (a) 25%, (b) 50%, and (c) 75%. 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
Which of the following is main advantage of using chopped fiber reinforcements ?
Easier manufacturing
Better control of directionality of fibers
Avoid voids in the matrix
Greater ratio of stress transferred to matrix
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Materials Science And Engineering 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.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_forwardWhich 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_forward
- A 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_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_forwardA 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_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_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_forward3) Tensile tests are applied on two type of fibers SiC and Al2O3, their densities are respectively 3.3 Mg/m³ and 2.6 Mg/m³. The deformation was elastic up to the failure of the fibers. The average tensile strength and strains to failure were: 1500 MPa and 0.4% for alumina fibers and 2200 MPa and 1% for SiC fibers. Calculate the specific modulus and specific strength for these two fibers.arrow_forward
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