Astm E83 Pdf

Using an ASTM E83-compliant extensometer ensures that the stress-strain curve data is accurate for calculating engineering constants.

ASTM E83 classifies extensometer systems into distinct classes based on their maximum error limits. The classes range from Class A (most precise) to Class E (least precise).

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: It provides a systematic method for ensuring that extensometers (devices that measure displacement) are accurate and reliable.

The differences between the calibrated displacement and the extensometer's indicated displacement are calculated to determine the class. Why You Need the Official ASTM E83 PDF Using an ASTM E83-compliant extensometer ensures that the

is the definitive international standard titled "Standard Practice for Verification and Classification of Extensometer Systems." Published by ASTM International (formerly the American Society for Testing and Materials), it is the most widely recognized document governing how extensometers—the devices that measure strain in tensile and compression tests—are verified and graded for accuracy.

: Step-by-step methods for calibrating extensometers against known reference displacements, such as calibrated micrometers or gauge block systems. Why You Need the Official ASTM E83 PDF

An ASTM E83 verification cannot be performed using standard tools. It requires a specialized calibration apparatus, often called an or micrometer drum , which itself must be certified and traceable to a national metrology institute like NIST. Step-by-Step Procedure:

Your calibration certificate must explicitly state the verified range, the classification achieved, and the specific temperature at which the test was conducted.

For each calibration point, the error is calculated as: $$Error = \frac\textIndicated Strain - \textTrue Strain\textTrue Strain \times 100%$$