Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 12.15, Problem 11KCP
To determine
What is meant by an aramid fiber? Mention the two kinds of commercially used aramid fibers.
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Students have asked these similar questions
For a glass/epoxy lamina with a 70% fiber volume fraction using the properties in the tables
provided below
(a) Find the ultimate tensile strength.
(b) Find the minimum and critical fiber volume fractions related to (a).
(c) Find the compressive strength when the matrix undergoes extension mode and when the
matrix undergoes shear mode, which one controls the compressive failure?
Property
Axial modulus
Transverse modulus
Axial Poisson's ratio
Transverse Poisson's ratio
Shear modulus
Axial tensile strength
Axial compressive strength
Transverse tensile strength
Transverse compressive strength
Shear strength
Epoxy Glass Units
3.4 85 GPa
3.4
85
GPa
0.3 0.20
0.3
0.20
1.308 35.42 GPa
72
1550 MPa
102
1550 MPa
72
1550 MPa
102
1550 MPa
34 35 MPa
What is the tenacity in
gf
of a 3.2 tex fiber
den
that ruptures under a load of 94.8 gf ?
Provide your answer with two decimal
positions and no unit.
Answer:
Continuous and aligned fiber-reinforced composite with cross-sectional area of 330 mm² (0.51 in.²) is subjected to a longitudinal load
of 49200 N (11100 lbf). Assume Vf=0.3, Vm = 0.7, Ef= 131 GPa and Em = 2.4 GPa.
(a) Calculate the fiber-matrix load ratio.
(b) Calculate the actual load carried by fiber phase.
(c) Calculate the actual load carried by matrix phase.
(d) Compute the magnitude of the stress on the fiber phase.
(e) Compute the magnitude of the stress on the matrix phase.
(f) What strain is expected by the composite?
Part 1
Calculate the fiber-matrix load ratio.
M
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Part 2
What is the load, in N, carried by the matrix and the fibers?
(a) What is the matrix load in N?
i
(b) What is the fiber load in N?
i
N
N
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Chapter 12 Solutions
Foundations of Materials Science and Engineering
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- It is desired to produce an aligned and continuous fiber-reinforced epoxy composite having a maximum of 50% fibers. A minimum longitudinal modulus of elasticity of 55 GPa and a minimum tensile strength of 1200 MPa are required. E-glass and carbon (PAN standard modulus) fibers are the possible candidates to select. In addition, assume the stress levels on the epoxy matrix at fiber failure are 70 MPa for E-glass fiber and 30MPa for carbon fiber, respectively. Which fiber meets the design requirement? Use the properties given in the Table below to evaluate your selection. Materials Epoxy matrix E-glass Carbon Modulus of Elasticity (GPa) 3.1 72.5 230 Tensile Strength (MPa) 69 3450 4000arrow_forwardIs it possible to produce a continuous and oriented aramid fiber–epoxy matrix composite havinglongitudinal and transverse moduli of elasticity of 35 GPa and 5.17 Gpa, respectively? Why or why not?Assume that the elastic modulus of the epoxy is 3.4 Gpa.arrow_forwardOn the basis of fiber length and orientation, which of the following results to an 'isotropic' properties of fiber-reinforced composites. Continuous and aligned Discontinuous and randomly oriented Discontinuous and alignedarrow_forward
- Boron coated with SiC reinforced aluminum containing 40 vol.% fibers is animportant high temperature, light weight composite material. Estimate the density, modulus of elasticity, and tensile strength of composite parallel to the fiber axis. Also estimate the modulus of elasticity of composite perpendicular to the fibres.arrow_forwardExplain the following fiber Materials in detail. (i) Aramid Fibers (ii) Alumina (iii) Carbon Fiberarrow_forwardWhat fiber fraction would be required for a composite with titanium fibers in a polycarbonate matrix (E = 2.5 GPa) to have the fibers handle 85% of a longitudinal tensile load? (Titanium Ef = 116 GPa )arrow_forward
- a dry, 2.4 den, mature wool fiber has reached its maximum tenacity value. How many grams would it take to rupture such fiber when dry?arrow_forwardA unidirectional fiber reinforced composite contains Kevlar 49 fibres and epoxy resin. the fibers are to carry 88% of a load applied in the longitudinal direction. determine the volume fraction of fibers that will be required ( two decimal places, e.g. 0.31).( elastic modulus of Kevlar 49 is 129GPA, and elastic modulus of epoxy 4.6 GPaarrow_forwardwhat is specific strength? why fibers have very high specific strength?arrow_forward
- Boron coated with SiC reinforced aluminium containing 40 vol.% fibers is animportant high temperature, light weight composite material. Estimate the density,modulus of elasticity and tensile strength of composite parallel to the fiber axis. Alsoestimate the modulus of elasticity of composite perpendicular to the fibres.arrow_forwardOriginal question: The nominal engineering constants of a unidirectional graphite epoxy ply are given in Table below for a fiber volume fraction of 60 percent. The fiber volume is reduced to 55 percent. Estimate the engineering constants for this reduced fiber volume fraction. New question needing to be answered: Repeat with a reduced fiber volume fraction of 40 percent representative of lower fiber volume fraction materials. Table:arrow_forwardCalculate the density of a composite made with 35% Kevlar-49 fibers in an epoxy resin (ρ = 1.1 kg/m3, E = 2.5 GPa). For Kevlar-49, Ef = 131 GPa; density = 1440 kg/m3arrow_forward
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