Page 8 held the table she dreaded: the maximum allowable strain error for each class. For their high-strength alloy, they needed Class B-2. That meant the extensometer’s reading could deviate no more than 0.0005 mm/mm of strain. Half a micron per millimeter. The width of a spider’s thread.
The tensile test began. The steel yielded at 485 MPa, right where it should. The extensometer, now a faithful servant, delivered the 0.2% offset data without complaint.
These classes are defined in Table 1 of the standard, which specifies both relative error limits for larger strain values and fixed error limits that apply at very low strain levels where relative errors would become unrealistically restrictive. This dual-limit approach ensures practical yet rigorous requirements across the entire measurement range. astm e83 pdf
Given the comprehensive overview above, you may decide you need the full official ASTM E83 PDF for your laboratory’s quality system or for accreditation purposes. ASTM standards are copyrighted documents; they are not legally available for free download from unauthorized sources.
is often sufficient for general tension testing where high precision in the elastic region is less critical. 🛠️ The Verification Process Page 8 held the table she dreaded: the
, titled the "Standard Practice for Verification and Classification of Extensometer Systems," provides the fundamental framework for ensuring that devices used to measure strain in materials—such as those used in tensile and compression testing—are accurate and reliable. The standard is essential for laboratories to maintain traceability to international measurement systems, ensuring that data produced in one facility is comparable and verifiable by others, such as customers or quality assurance auditors. Key Functions and Scope
This standard is critical in industries where material properties—such as Young’s Modulus, yield strength, and elongation at break—must be reported with high confidence. It ensures that a tensile test performed in a laboratory in Germany yields the same data as one performed in the United States, provided the extensometers meet the same ASTM E83 classification. Half a micron per millimeter
Whether you are a testing laboratory manager, a quality engineer, or a researcher, understanding and implementing ASTM E83 is fundamental to producing trustworthy material property data. The standard's classification system provides a clear framework for matching equipment capability to application requirements, while its verification procedures ensure that this capability is maintained over time.
Globally, ASTM E83 has a counterpart in the ISO 9513 standard ("Metallic materials — Calibration of extensometer systems used in uniaxial testing"). While both serve to ensure accurate strain measurement, a key difference lies in their expression of error limits. ISO 9513 specifies limits in absolute units like micrometers (µm), which are dependent on gage length. In contrast, ASTM E83 uses strain units (m/m), making the specification independent of gage length and often more versatile.
The scope of ASTM E83 is clear and focused: