What is the difference between proportionality limit and elastic limit

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Create new account Request new password. The material behavior is described by a piece-wise linear stress-strain curve, starting at the origin, with positive stress and strain values. The curve is continuous from the origin through numerous stress-strain points. Successive slopes can be greater than the preceding slope; however, no slope can be greater than the elastic modulus of the material.

The slope of the first curve segment usually corresponds to the elastic modulus of the material, although the elastic modulus can be input as greater than the first slope to ensure that all slopes are less than or equal to the elastic modulus. Your email address will not be published. Skip to content Home. Elastic limit and Proportionality limit.

Reina Hand DVM. Got the answer? Help Reina out. Find a Physics Tutor. Related Questions Describe what Density means. How can I work out the density using the mass and the volume? If an object has a higher density than water, will it sink or float? So, what is the limit of proportionality? We define the proportional limit as the highest stress at which the stress-strain curve is a straight line. Therefore, the difference between elastic limit and proportional limit is, elastic limit is the point at which there is no permanent deformation in a structure or the point at which the body regains its original shape, while the proportional limit is the point at which stress is directly proportional to the strain.

In Graph. At this point, the wire shows an increase in strain without any increase in stress, as the strain increases after point C, the wire begins to flow down and continues till point D. A time comes when it reaches point D, the wire becomes perfectly plastic.