There are many situations where a piece of material is exposed to a stress for a
protracted period of time. The stress/strain data obtained from the con-
ventional tensile test refer generally to a situation where the stresses are applied
for quite short intervals of time and so the strain results refer only to the
immediate values resulting from stresses. Suppose stress were applied to a
piece of material and the stress remained acting on the material for
a
long time -
what would be the result? If you tried such an experiment with a strip of lead
you would find that the strain would increase wit ...
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