Poisson’s Ratio
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ASTM D 638, ISO 527
A2LA Accredited
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Scope:
When uniaxial force is applied, the specimen will deform not only in the direction of the force (axial) but also laterally (transverse). Poisson’s Ratio is a measure of transverse strain against axial strain when uniaxial stress is applied.
Test Procedure:
The specimen is clamped into the grips of the Instron universal tester. Two strain measuring devices are attached to the specimen, one axial and one transverse. A uniaxial force is applied at a predetermined speed.
Specimen size:
A standard tensile bar can be used.
Data:
A stress-strain graph is produced and Poisson’s ratio is calculated.
Equipment Used:
Instron Universal Tester
Extensometers
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