Question

? time time Figure 3.1 Experiment to apply strain and measure stress Figure 3.1 shows an experiment to investigate a viscoelastic characteristic of a polymeric material. (i) Describe what is happening to the material at each stage of this experiment. [2 Marks] (ii) Identify one viscoelastic effect that is evident in the result of this experiment. [2 Marks] (!!!) Sketch what a graph of stress versus strain would look like for the complete experiment. [3 Marks] (iv) If you wanted to develop a set of isochronal curves (of the type shown in Figure 3.2) to characterise the material's behaviour under this type of loading scenario, what other experiments would you conduct and how would you obtain at least six data points needed to define the isochronal lines below from the results? [6 Marks] ? ta ? Figure 3.2 - Sample Isochronal curves for a hypothetical material.

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time
time
Figure 3.1 Experiment to apply strain and measure stress
Figure 3.1 shows an experiment to investigate a viscoelastic characteristic of a
polymeric material.
(i)
Describe what is happening to the material at each stage of this experiment.
[2 Marks]
(ii) Identify one viscoelastic effect that is evident in the result of this experiment.
[2 Marks]
(!!!) Sketch what a graph of stress versus strain would look like for the complete
experiment.
[3 Marks]
(iv)
If you wanted to develop a set of isochronal curves (of the type shown in Figure
3.2) to characterise the material's behaviour under this type of loading
scenario, what other experiments would you conduct and how would you
obtain at least six data points needed to define the isochronal lines below from
the results?
[6 Marks]
?
ta
?
Figure 3.2 - Sample Isochronal curves for a hypothetical material.

?
time
time
Figure 3.1 Experiment to apply strain and measure stress
Figure 3.1 shows an experiment to investigate a viscoelastic characteristic of a
polymeric material.
(i)
Describe what is happening to the material at each stage of this experiment.
[2 Marks]
(ii) Identify one viscoelastic effect that is evident in the result of this experiment.
[2 Marks]
(!!!) Sketch what a graph of stress versus strain would look like for the complete
experiment.
[3 Marks]
(iv)
If you wanted to develop a set of isochronal curves (of the type shown in Figure
3.2) to characterise the material's behaviour under this type of loading
scenario, what other experiments would you conduct and how would you
obtain at least six data points needed to define the isochronal lines below from
the results?
[6 Marks]
?
ta
?
Figure 3.2 - Sample Isochronal curves for a hypothetical material.

Added by Jose Francisco W.

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