: The standard can be purchased directly from astm.org as a standalone PDF download or via an annual subscription to the Annual Book of ASTM Standards (Volume 03.01).
Outlines what types of systems the PDF covers (including contact, non-contact, video, and laser extensometers).
: Extensometer systems are categorized into "classes" (like Class B-1 or C) based on their maximum allowable error. For example, many high-performance tests require a Class B-1 rating to meet strict aerospace or automotive requirements.
Commonly used for determining modulus of elasticity and yield strength. Class C, D, & E: astm e83 pdf
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To ensure these measurements are globally consistent and accurate, the American Society for Testing and Materials (ASTM) established . This standard practice defines how to verify and classify extensometer systems.
The extensometer is mounted to the calibration apparatus at its nominal gauge length. : The standard can be purchased directly from astm
The initial distance between the two points on the specimen where the extensometer attaches.
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This is the "how-to" manual for technicians executing the test. For example, many high-performance tests require a Class
The standard categorizes extensometers into "Classes" based on their maximum error and repeatability. When you review an ASTM E83 PDF, you will see a table detailing these requirements: Relative Error of Gauge Length Fixed Error (whichever is greater) ±0.00001 in. Class B-1 ±0.0001 in. Class B-2 ±0.0001 in. Class C ±0.001 in.
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Extensometer systems are classified based on the maximum allowable error of the indicated strain and their overall displacement resolution. When a calibration engineer evaluates a system, they assign it one of six distinct classes: Extensometer Class Maximum Error of Indicated Strain Resolution Requirement Typical Application Extremely strict limits Exceptionally high resolution Specialized research, high-precision calibration standards Class B-1 of reading or fixed limit Modulus of elasticity testing for aerospace alloys Class B-2 Slightly higher fixed error allowance Standard metals testing, yield strength ( Rpcap R sub p ) determination Class C Moderate error threshold General tension/compression tests, plastic deformation Class D Higher error threshold High-elongation materials, polymers, elastomers Class E Maximum permissible error tier Broad structural tear/break limits