Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 12.15, Problem 35AAP
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Describe the carbon-fiber epoxy composite laminates created with various carbon fiber layers oriented at different angles to each other.
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Why do thermoplastic polymers start to turn white as they are plastically deformed?
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
4000
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
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- (b) Which of the following plastic and composite materials processing is most suitable for the application of polymer automotive body panel? Explain how the selected manufacturing process selected can be used to produce the product shown in Figure 1.2 below • Injection Moulding • Reaction injection Moulding (RIM) • Blow Moulding • Rotational Moulding • Thermoforming • Compression Moulding (CM) • Transfer Moulding (TM) • Casting • Foam Moulding SULIT SULIT (BMCG 2323) Figure 1.2 Example of polymer automotive body panelarrow_forwardWhat is the typical appearance and mechanical behaviour of this polymer PXX?arrow_forwardWhat are the major advantages of plastic compared to ceramics. Glasses and metals?arrow_forward
- Please make sure to display your thought process? It is imperative to be able to follow how the answer was deduced. Please be as thorough as possible. Please address all parts of this question as they are all part and critical to answering this question correctly. Please show good integrity when answering the question: Strain-rate, temperature, pressure, and aging time all affect the stress/strain behavior of polymers. Draw a stress-strain curve below for a typical ductile polymer. Clearly label the yield point and the ultimate tensile strength. Using this curve draw two new curves corresponding to same polymer but now tested at: 1) an increase in temperature and 2) an increase in strain rate. Explain what happens to the tensile behavior after: a) a prolong time of aging time is increased and b) when the tensile tests are conducted under super imposed hydrostatic compressionarrow_forwardQuestion 5 a. Describe TWO (2) important factors that affect materials chain flexibility and properties b. Discuss briefly factors that influencing plastic properties. c. What are important factors influencing glass transition temperature of amorphous polymers?arrow_forwardIf the tensile strength of the Kevlar 49 fibers is 3.8 GPa and that of the epoxy resin is 75.9 MPa, calculate the tensile strength of the composite material in Q3b(i). Calculate the fraction of load carried by the Kevlar 49.arrow_forward
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