*It is different from the pressure, though; when calculating stress, the area considered must be so small that the analyzed particles are assumed to be homogeneous.*

*It is different from the pressure, though; when calculating stress, the area considered must be so small that the analyzed particles are assumed to be homogeneous.If we take into account a bigger area, the calculated stress is usually the average value.What exactly is a linear elastic behavior of a material?*

Strain has no units due to simply being the ratio between the extension and original length of a material, so Young's Modulus is measured by the same units as stress, i.e.

newtons per square metre (Nm) is equal to the area under the curve, between the y-axis and the fracture point.

On a stress strain graph beyond the yield point (or elastic limit) the material will no longer return to its original length. Therefore the yield stress is the level of stress at which a material will deform permanently. Strain is a measure of how much an object is being stretched.

The formula for strain is: is the original length of a bar being stretched, and l is its length after it has been stretched.

Materials for which Hooke's law is a useful approximation are known as linear-elastic, or 'elastic materials'.

In this region (between points 2 and 3), the rate at which extension is increasing is going up, and the material has passed the elastic limit - it will no longer return to its original shape when the load is removed, and will no undergo plastic (permanent) deformation.

In a brittle material, such as glass or ceramics, the stress-strain graph will have an extremely short elastic region, and then will fracture.

There is no plastic region on the stress-strain graph of a brittle material.

Stresses acting parallel to a surface are known as shear stresses.

The (ultimate) tensile strength is the maximum tensile stress a material can experience before breaking (and a change of cross-sectional area as a result) will occur. Putting pressure on an object causes it to stretch.

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