Use the graph below to sketch curves that demonstrate
anticipated stress-strain behavior for two materials. One curve
should represent a typical metal, the other a typical ceramic.
Label the curves and use them to describe anticipated differences
in material properties.
For each of the following pairs of polymers, plot and label
schematic stress-strain curves on the same
graph [i.e. make separate plots for parts (a), (b) and (c)].
(a) Polychloroprene rubber having a number-average molecular
weight of 100,000 g/mol and 15% of available sites cross-linked;
liner polypropylene having a number-average molecular weight of
150,000 g/mol.
Q1. Describe mechanical properties of stress-strain
behavior of a polymer and a plastic (contrast with stress-strain
curves of ceramics and metals)
Q2. Describe variation of elastic/relaxation modulus
with temperature.
Q3. Describe viscoelasticity and examples of a
rubber/elastomer.
Describe the general theory of stress and strain. Explain the
properties and characteristics that can be determined using a
tensile test. Give general comparison of the different samples.
This should be 1-2 pages typed
By sketching the stress-strain curves for concrete and
reinforcement steel, explain the philosophy of idealization the
characteristic strength for concrete and reinforcement steel so to
be used in reinforced concrete design. Elaborate the importance of
such idealization in design.
The results of a tensile test can be evaluated as
either engineering stress-strain curves or true stress-strain
curves. The original cross-sectional area of the tensile test
specimen is used to plot the former one, whereas the instantaneous
cross-sectional area is used for the latter one. Assume that you
are an engineer who needs to design a structural product using a
hypothetical metal A, which should not plastically deform in the
application area. You need to apply a tensile test to...