The compressive longitudinal strain

Thread starter ahmeeeeeeeeee
Start date Jan 6, 2012
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Longitudinal Strain

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Strain is defined as the ratio of absolute deformation to the initial length, and it can indeed be negative under compressive loading conditions. The formula for strain, e = (a - b)/b, indicates that when the stressed length (a) is less than the original length (b), the strain becomes negative. This leads to the conclusion that Poisson's ratio, which describes the ratio of transverse strain to axial strain, can also be negative for ordinary materials under compression. The discussion clarifies that "absolute" in this context does not refer to the absolute value. Understanding these concepts is crucial for analyzing material behavior under stress.

Jan 6, 2012

ahmeeeeeeeeee

Hello,

is the strain defined as the absolute deformation to the initial ? i.e is it always positive ??

If Yes , then poission's ration is negative for compression of ordinary materials ?

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Jan 6, 2012

LawrenceC

Strain is defined as belowl

e = (a - b)/b

where b is original length and a is the stressed length. So it can be negative for compressive loading. Absolute does not mean |absolute value|.

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