The stress-strain curve below is for an epoxy-carbon composite:Stress Strain Curve Composites3.00102.50102.00101.50E101.00+105.00E090.1502StrainThe mechanical properties of the component materials are in the table below:E (GPa)Strength(MPa)Elongation ()Ероху (Rein)31006Carbon Fibre (Fibre)3007500a) Using the data in the graph, estimate the stiffness of thecomposite.b) Calculate the volume fraction of the fibres. Assume thefibres are in the longitudinal direction.c) What is the theoretical strength of the composite?Stress in Pascals c) What is the theoretical strength of the composite?The composite from a) to c) was made by vacuum bagging into a rectangular section.The composite section is then loaded in bending. The strain through the cross section ismeasured and plotted below:25Stn- Lier rainiPosition onCross Section relative to the bottom of the Section (mm)d) Where is the neutral axis for bending?e) If the neutral axis is not in the middle of the cross-section, explain why.)A rectangular cross section of a composite with the same fibre volume fraction as thevacuum bagged section is made using wet layup instead. This new composite (the wetlayup one) cracks at a strain of 0.1. Why isn't the wellayup composite as strong as thevacuum bagged one?g) Ted is performing a tension test of PVAC (polyvinylacetate) in a lab which has an airtemperature of 10degC. She is too cold and she turns the air conditioner temperatureup to 25deg C. Suddenly her samples go "all floppy and sticky". What happened?Useful formulae:Ec = EfVf + EmVmac - ofVf + amVm

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The stress-strain curve below is for an epoxy-carbon composite: Stress Strain Curve Composites 2.00 Stain The mechanical properties of the component materials are in the table below: E GP Strength (MPa) Elongation 9

The stress-strain curve below is for an epoxy-carbon composite: Stress Strain Curve Composites 2.00 Stain The mechanical properties of the component materials are in the table below: E GP Strength (MPa) Elongation 9

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Processing of Polymer Matrix Composites

The polymer matrix composite is described as a composite material that contains some polymer in the form of either fibers or powder. Polymer matrix composites are also known in short as PMC's.

Question

The stress-strain curve below is for an epoxy-carbon composite:
Stress Strain Curve Composites
3.0010
2.5010
2.0010
1.50E10
1.00+10
5.00E09
0.15
02
Strain
The mechanical properties of the component materials are in the table below:
E (GPa)
Strength
(MPa)
Elongation ()
Ероху (Rein)
3
100
6
Carbon Fibre (Fibre)
300
7500
a) Using the data in the graph, estimate the stiffness of the
composite.
b) Calculate the volume fraction of the fibres. Assume the
fibres are in the longitudinal direction.
c) What is the theoretical strength of the composite?
Stress in Pascals

c) What is the theoretical strength of the composite?
The composite from a) to c) was made by vacuum bagging into a rectangular section.
The composite section is then loaded in bending. The strain through the cross section is
measured and plotted below:
25
Stn
- Lier raini
Position on
Cross Section relative to the bottom of the Section (mm)
d) Where is the neutral axis for bending?
e) If the neutral axis is not in the middle of the cross-section, explain why.
)A rectangular cross section of a composite with the same fibre volume fraction as the
vacuum bagged section is made using wet layup instead. This new composite (the wet
layup one) cracks at a strain of 0.1. Why isn't the wellayup composite as strong as the
vacuum bagged one?
g) Ted is performing a tension test of PVAC (polyvinylacetate) in a lab which has an air
temperature of 10degC. She is too cold and she turns the air conditioner temperature
up to 25deg C. Suddenly her samples go "all floppy and sticky". What happened?
Useful formulae:
Ec = EfVf + EmVm
ac - ofVf + amVm

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