ASTM E83 classifies extensometers based on their performance, primarily the maximum permitted error of strain. Choosing the right class is crucial, as a higher class (like Class A) is required for high-precision modulus testing, while lower classes might suffice for general testing. Highest accuracy; maximum error of Class B-1: High accuracy; maximum error of Class B-2: Moderate accuracy; maximum error of Class C: Standard accuracy; maximum error of Class D: Lower accuracy; maximum error of
Extensometers should be verified periodically (e.g., annually) or whenever the device has been repaired, modified, or damaged. ASTM E83-23 and Modern Optical Extensometers
: Prior to starting, the testing atmosphere and the device must reach thermal equilibrium to eliminate thermal expansion drift.
The PDF provides detailed instructions on the apparatus required for verification, such as calibration benches, micrometer heads, or optical devices that apply controlled displacements. Understanding ASTM E83 Extensometer Classes astm e83 pdf
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: 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.
This standard ensures that devices used to measure strain in materials yield accurate, repeatable, and linear results during tensile or compressive testing. ASTM E83-23 and Modern Optical Extensometers : Prior
ASTM E83 is the bedrock of reliable strain measurement in materials testing. By understanding its classification tiers and adhering to its strict verification schedules, laboratories can guarantee that their data stands up to both scientific scrutiny and strict industry audits.
: The document states it is not a complete commercial purchase specification. It also specifically excludes bonded resistance strain gauges directly glued to a test specimen from being verified with the standard mechanical apparatus mentioned inside the practice. 2. Extensometer Classification Tiers
The verification process outlined in the standard ensures that the extensometer is behaving linearly and accurately over its full range. 1. Calibration Device It wasn't just a scan
To certify an extensometer system to an ASTM E83 standard, a qualified calibration technician uses a specialized calibration apparatus (often called an extensometer calibrator). 1. Temperature Stabilization
The standard defines procedures to verify that an extensometer—the device used to measure length changes in a specimen during tensile or compressive testing—is performing within specified error limits. Afnor EDITIONS Dimensionality
Without a standardized verification process like E83, the data from a tensile test would be unreliable. 🔍 Key Classifications in ASTM E83