Astm E83 — Pdf Work

, which specifically addresses the verification requirements for optical (non-contacting) extensometers . This update emphasizes: Setup Consistency:

When using ASTM E83, it's important to keep several key points in mind. First, the standard explicitly excludes bonded resistance strain gauges that are directly glued to a specimen, which must be handled by a different procedure (ASTM E251). Secondly, an extensometer may achieve a certain classification, such as Class B-1, for small strains but may only be rated for a lower class, like Class C, at larger strains, so it is critical to verify the valid range of your specific system.

Understanding ASTM E83: The Standard Practice for Verification and Classification of Extensometer Systems astm e83 pdf

The difference between the displacement indicated by the extensometer and the true displacement shown by the calibration device is calculated. How to Access the ASTM E83 PDF Safely and Legally

Many engineering universities subscribe to ASTM Compass. If you are a student or faculty, check your library portal. Large corporations often have a "standards librarian" who can email you the PDF. If you are a student or faculty, check your library portal

Specific equations for calculating error and repeatability.

An extensometer system includes the sensor itself (the device attached to the specimen) and the entire data acquisition system, including digital displays, amplifiers, and data-logging software. ASTM E83 ensures that this complete system measures changes in length with a known, acceptable margin of error. Why is ASTM E83 Critical for Testing Labs? including digital displays

The extensometer and the verification apparatus must be kept in the same environment for a specific period to prevent thermal expansion from skewing results. 2. Multi-Point Calibration

The deviation in the actual displacement measured during the test. Extensometer Class Maximum Error of Indicated Strain (Whichever is greater) Fixed Error Limit Typical Applications Class A ±plus or minus 0.1% of reading ±plus or minus Ultra-precise research, calibration of other devices Class B-1 ±plus or minus 0.5% of reading ±plus or minus Determining modulus of elasticity for metals Class B-2 ±plus or minus 0.5% of reading ±plus or minus Standard tensile testing, yield strength verification Class C ±plus or minus 1.0% of reading ±plus or minus High-elongation materials, plastics, elastomers Class D ±plus or minus 1.0% of reading ±plus or minus Rough elongation measurements The Verification Process: How It Works