Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 12.15, Problem 65AAP
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Explain why concrete is primarily used in compression in engineering designs.
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What are the main characteristics of concrete?
(a) (ii) Considering some concrete structures may fail after completion, explain
the importance of routine testing the concrete batches.
A continuous and aligned fiber-reinforced composite having a cross-sectional area of 1200 mm² is subjected to an external tensile
load. If the stresses sustained by the fiber and matrix phases are 152 and 2.27 MPa, respectively, the force sustained by the fiber phase
is 72300 N, and the total longitudinal strain is 0.00143, determine the following:
(a) The force sustained by the matrix phase (in N).
i
(b) The modulus of elasticity of the composite material in the longitudinal direction (in GPa).
i
N
i
(c) The modulus of elasticity for the fiber phase (in GPa).
GPa
i
GPa
(d) The modulus of elasticity for the matrix phase (in GPa).
GPa
Chapter 12 Solutions
Foundations of Materials Science and Engineering
Ch. 12.15 - Define a composite material with respect to a...Ch. 12.15 - Prob. 2KCPCh. 12.15 - What are some of the advantages of glass...Ch. 12.15 - Prob. 4KCPCh. 12.15 - Prob. 5KCPCh. 12.15 - What properties make carbon fibers important for...Ch. 12.15 - Prob. 7KCPCh. 12.15 - Prob. 8KCPCh. 12.15 - Prob. 9KCPCh. 12.15 - Prob. 10KCP
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- (b) A continuous and aligned fiber-reinforced composite is to be produced using 45 vol% of aramid fibers and 55 vol% of polycarbonate matrix. Mechanical properties of these two materials that are given in Table Q5(b): Table Q5(b): Mechanical properties of fiber and matrix Modulus of Elasticity (GPa) Tensile Strength (MPa) Aramid Fiber 131 3600 Polycarbonate 2.4 65 If the stress on the polycarbonate matrix is 35 MPa, when the aramid fibers fail, then compute the followings: (i) the longitudinal tensile strength (ii) the longitudinal modulus of elasticityarrow_forwardIs the bulk modulus a measure of the stiffness of a volume of materials?arrow_forwardWhich of the following statements regarding concrete is incorrect? (a) The matrix of concrete is cement, which hardens by hydration reactions of calcium silicates. (b) The modulus of concrete follows an inverse law of mixtures between the volume fracture of aggregate and the volume fraction of cement. (c) The compressive strength of concrete develops in two stages - an initial setting reaction, which occurs over a period of hours, and a hardening reaction, which may continue for many months. (d) The rate of the hardening reaction is controlled by the rate at which water evaporates from the concrete and so the hardening reaction is temperature dependent. (e) The final compressive strength of concrete depends on the initial water/cement ratio and decreases at high water/cement ratios.arrow_forward
- What two things influence the properties of concrete masonry units?arrow_forwardSelect suitable material for cement concrete and explain the selection procedure for selecting suitable material for concrete?arrow_forward1. An element of graphite-reinforced composite is completely dry and is constrained against any dimensional changes in the 1 and 2 directions, but it is free to expand in the 3 direction. The element absorbs 1.5% of its dry weight in the form of moisture. (a) What is the strain in the 3 direction as a result of the moisture absorption? Why is this strain different from the value given by B3AM? (b) What stresses develop in the element? Assume that moisture absorption does not influence the material properties.arrow_forward
- If 14 MPa lateral pressure is applied to a cylinder concrete sample with characteristic compressive strength (no lateral pressure) of 20 MPa, will the strength be?arrow_forwardCan the buckling of a column lead to a sudden and dramatic failure of a structure?arrow_forwardA continuous and aligned fibrous reinforced composite having a cross-sectional area of 975 mm, then the area is subjectedi to an extenal tensile load. If the stresses sustained by the fibre and matrix phases are 215 MPa and 5.38 MPa, respectively, the force sustained by the fibre phase is 76,800 N, and the total longitudinal composite strain is 1.56x103 then determine.arrow_forward
- Advanced hybrid materials technology has been used in automotive applications. A good example is engine block made of aluminum body with cast iron liner as shown in Figure. Please explain its advantages and possible disadvantagesarrow_forwardThe strength-density properties can be determined from bar chart. The strength of composite can be determined from: Tensile failure strength Tensile tear strength Modulus of rupture Yield strengtharrow_forwardWhy are composites used in engineering?arrow_forward
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