set up in the plastic component. Stress relaxation with time data is similar to
the isometric stress with time graphs for a material.
Problems
1 Explain what is meant by 'creep'.
2 Describe the form of
a
typical strain/time graph resulting from a creep test
and explain the significance of the slope of the graph at its various stages.
3 Describe the effect of
(a)
increased stress and (b) increased temperature on
the creep behaviour of materials.
4 For the alloy described in Figure 8.6 estimate the stress that will result in a
1 per cent creep at a temperature of 900°C after 10 000 h.
5 For the alloy described in Figure 8.4, estimat ...
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