The behaviour of materials subject to tensile and compressive forces can be
described in terms of their stress/strain behaviour, stress being the applied
Nominal
0
Strain
Figure 5.1 Effect of different definitions of stress
0.20
a.
E
300
200
0.002 0.004
Strain
(b)
Figure 5.2 Stress/strain graphs for (a) Mild steel, (b) Cast iron
94 Engineering Materials
Technology
force per unit area and strain the extension, or contraction, per unit original
length of material. The area referred to in the stress definitio ...
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