ASTM E83 Standard Practice for Verification and Classification of Extensometer Systems

ASTM E83 Introduction

ASTM E83 is a methodological system to check the compliance of an extensometer with the classes of specified accuracy. Extensometers are sensitive measurements used in testing the strain or elongation of materials. Calibration and verification are necessary because their performance has a direct effect on the accuracy of mechanical property determinations. It establishes tolerances of allowable error and steps to be followed in comparing extensometer readings to a reference device whose calibration can be traced.

ASTM E83 Test Method

ASTM E83 Equipment and Sample Preparation

ASTM E83 Results and Interpretation

This method of verification gives the results in the form of the accuracy classification of the extensometer system. These classifications are determined by the highest error that can be permitted as a percentage of strain or displacement applied. Extensometers with smaller tolerance limits are put in more precise categories and are therefore used in more exacting applications like the determination of modulus. Less critical testing can still be conducted with extensometers of inferior classifications. 

ASTM E83 Related Test Methods

ASTM E8 for tension testing of metallic materials and ASTM E9 for compression testing of metallic materials depend on extensometer readings for the precise determination of properties such as modulus of elasticity and yield strength.

ASTM E83 Applications and Industry Use

This is common in materials testing labs, research centers, and industrial quality control environments. It has been utilized in the calibration of extensometers that test metals, composites, plastics, ceramics, and other structural materials. This method is used in industries like aerospace, automotive, energy, and construction to verify the validity of the mechanical test data that is used in design and certification.

ASTM E83 Materials Commonly Tested

Although not a materials test in and of itself, this method applies to extensometers that test a variety of materials. They are metals, alloys, polymers, compounds, and ceramics, especially when measuring strain accurately to calculate mechanical behavior.

ASTM E83 Common Challenges and Troubleshooting

Issues with using this standard are that it is necessary to ensure that the extensometer fits correctly into the calibration component, that external vibration or mechanical play is minimized, and that environmental factors (like temperature) are considered. Mistakes can also be made when reference devices are not calibrated. Minimal uncertainty can be achieved by careful installation, periodic inspection of equipment, and compliance with the calibration processes.

ASTM E83 Safety and Best Practices

Even though the verification procedure is associated with the minimum level of hazards, it is still suggested that the extensometers and calibration tools should be handled with care to prevent mechanical damage. In case the specimen being tested is loaded, proper precautions should be observed to avoid mishaps in case of sudden failure of the specimen. Verification procedures are more likely to be accurate and safe when there is a clean, stable environment.

Importance of ASTM E83 Test Method

It helps make the mechanical property data verifiable and allows for meeting quality requirements and introducing credibility to engineering design and material certification processes by providing a clear framework according to which they are checked and categorized.