Astm E83 Pdf Jun 2026
represents the highest precision, with a maximum allowable error of just ±0.1% strain, making it essential for applications demanding the utmost accuracy. Class B-1 and B-2 are commonly required for precise modulus and yield strength determination, with a relative error limit of ±0.5%. Class C allows a relative error of ±1% and is often used for general elongation measurements after the yield point of a material. Class D and Class E provide lower accuracy and are suitable for large-strain measurements where extreme precision is less critical.
| | Typical Use Case | | :--- | :--- | | Class A | Highest precision; used in research, calibration laboratories, and critical applications | | Class B-1 | High accuracy suitable for most general testing requirements | | Class B-2 | Medium accuracy for routine quality control | | Class C | Lower accuracy for less critical testing | | Class D | Low accuracy for preliminary or educational use | | Class E | Lowest accuracy, with correspondingly higher permissible errors |
Name the calibration device used to feed displacement into the extensometer (e.g., a laser interferometer or high-precision micrometer).
An extensometer verified under ISO 9513 is not automatically compliant with ASTM E83, and vice versa. If your lab uses both standards, you must verify the device twice. astm e83 pdf
, which specifically addresses the verification requirements for optical (non-contacting) extensometers . This update emphasizes: Setup Consistency:
: The standard typically requires periodic verification to maintain the validity of test data. Alternatives and Related Standards
Whether you need help preparing for a specific (like Nadcap or ISO 17025). represents the highest precision, with a maximum allowable
The standard applies to instruments used to measure changes in length (displacement) during mechanical testing. This includes contact extensometers (clip-on, strain gauge, LVDT), non-contact systems (video and laser extensometers), and deflectometers. It covers both strain-measuring and crosshead-displacement systems under static or quasi-static loading. 2. Verification Apparatus
The scope of ASTM E83 is clear and focused:
This encompasses more advanced technologies, such as non-contact video or laser extensometers, that measure strain across a virtual gage length. The standard provides specific guidance for verifying these systems. Class D and Class E provide lower accuracy
is the standard practice for the verification and classification of extensometer systems , which are instruments used to measure the change in length of a specimen during material testing. Essential Information from ASTM E83
The Ultimate Guide to ASTM E83: Standard Practice for Verification and Classification of Extracyclic and Extensometer Systems
In the world of materials testing, the accuracy of strain measurement is paramount. Whether determining the modulus of elasticity of a new steel alloy or the yield strength of a polymer, the reliability of your data hinges on the performance of a single, critical instrument: the extensometer. To ensure that these measurements are consistent, accurate, and comparable across the globe, the ASTM International has established a definitive standard, known as .