The stress shown in is an example of a textfigure 6 2 book stress strain curve.
Stress strain curve of metals ceramics and polymers.
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.
A highly elastic polymer may stretch over 10 times the original length before breaking while a metal might elastically stretch 10 of the original length elastically and may stretch plastically to double the original length before reaching its fracture point.
The yield point is the maximum of the stress strain curve the weird circle symbol.
Stress strain curve is the plot of stress and strain of a material or metal on the graph.
In reality not all stress strain curves perfectly resemble the one shown in strain figure 6 2.
Elastic plastic energy very small toughness unreinforced polymers engineering tensile strain ε engineering tensile stress σ small toughness ceramics large toughness metals adapted from fig.
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.
The linear portion of the curve is the elastic region and the slope is the modulus of elasticity or young s modulus.
Low carbon steel generally exhibits a very linear stress strain relationship up to a well defined yield point fig 1.
While some of the stress strain curves for polymers might look similar to ones for metals polymers are mechanically different than metals or ceramics.
Metals and its alloys contain atoms that are arranged in orderly manner.
The stress strain curve for metals ceramics and polymers the curve i have shown you is a typical curve for ductile materials.
Metallic bonding is great for this sort of re bonding which is why metals are usually ductile.
Stress strain curves for two brittle materials.
Many ductile materials including some metals polymers and ceramics exhibit a yield point.
A typical stress strain curve would look like figure 6 2strain curve.
Difference between metals ceramics and polymers with respect to modulus and tensile strengths the modulus values for highly elastic polymeric materials are lower than those of metals.
Stress strain curves for metals ceramics and polymers objective we are interested about studying and comparing stress strain curves of metals ceramics and polymers.
This stress curve is typical for ductile metallic elements.
Primarily differences are due to their different chemical bonding properties homework 1.
Plasticity happens when the atoms slip when they break bonds and reform new ones.
In this the stress is plotted on the y axis and its corresponding strain on the x axis.
Elasticity ductility and tensile strength those four materials can be simplified by these definitions.
Elastic energy ductile fracture.
