Draw and label the engineering stress strain graph for ceramics metals and polymers and indicate the level of toughness of this materials.
Stress strain graph for ceramics.
There are various sections on the stress and strain curve that describe different behaviour of a ductile material depending on the amount of stress induced.
It is a widely used reference graph for metals in material science and manufacturing.
At this point the material starts to undergo plastic deformation.
With a very short elastic region but highly capable of supporting huge stresses.
By convention the strain is set to the horizontal axis and stress is set to vertical axis.
1 metals al alloy stress strain curve.
A ductile material shows a characteristic yield point followed by a drop in strength and break at lower stress but much higher strain.
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In this the stress is plotted on the y axis and its corresponding strain on the x axis.
The hard fired materials exhibit straight line deformation to failure while the softer fired have a proportional elastic limit beyond which the stress strain curve deviates.
Mechanical properties of polymers.
The stress strain curve is a graph that shows the change in stress as strain increases.
Three point bending apparatus used determine stress strain behavior.
While some of the stress strain curves for polymers might look similar to ones for metals polymers are mechanically different than metals or ceramics.
Elastomers are the ones that strains more w a lower stress.
And finally analogous to ceramics are the stiff fibers and rigid plastics.
For brittle ceramics a three point bending apparatus shown in the figure below is used determine the stress strain behavior and the measurement results are used to calculate an equivalent modulus of elasticity.
After plotting the stress and its corresponding strain on the graph we get a curve and this curve is called stress strain curve or stress strain diagram.
The electric strain gauge was used to study the deformation of several types of ceramic materials under stress.
Predict the type of material suitable to be used to reduce the effect of sudden impact.
Stress strain curve is the plot of stress and strain of a material or metal on the graph.
Stress strain curve for this material is plotted by elongating the sample and recording the stress variation with strain until the sample fractures.
Ceramic steel glass and copper.
Ceramics are extremely strong and have very high uts values.
It was found that they behaved as elastic materials.
Materials with high plasticity show strong necking and in some cases cold drawing.
