General Force Measurement
Elastic Limit Testing

Determining the elastic limit of a sample material involves the measurement of the greatest stress that can be applied to a sample material without causing permanent deformation.  For metals or other rigid materials having a straight-line portion in their stress/strain curve, elastic limit is approximately equal to the proportional limit.  Arbitrary approximation of the elastic limit of materials that do not have a significant straight-line portion on a stress/strain curve, such as rubber or plastic, is called Apparent Elastic Limit.  It is equal to the stress at which the rate of strain is 50% greater than at a zero stress.  It is the stress at the point tangent between the stress- elastic hysteresis strain curve and the line having a slope, with respect to the stress axis, 50% greater than the slope of the curve at the origin.

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