ASTM. E is applicable for linear variable displacement transformers ASTM E also has multiple accuracy classifications similar to ASTM E83 for the. THE FOLLOWING DESCRIBED EQUIPMENT IN ACCORDANCE WITH. ASTM- E AND UTS SOPRev CERTIFICATE NUMBER: CR# GWASTM E Standard Practice for Verification and Classification of Extensometer Systems_自然科学_专业资料。GWASTM E
Extensometer readings should be chosen starting with the minimum reading and are grouped in overlapping decades such that the maximum reading on one decade is the minimum on the next decade.
If the reading does not return to zero, adjust and repeat the procedure until the reading does return to zero. If the document is revised or amended, you will be notified by email.
This is especially true with optical extensometers which may be adversely affected by air density changes associated with thermal gradients and turbulence, environmental chamber windows, or specimen changes due to the environment. Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard.
This specimen is then placed in the environmental chamber, and the environmental and optical conditions to be used in the test can be reproduced.
See procedures as described in Test Methods E The practice is applicable only to instruments that indicate or record values that are proportional to changes in length corresponding to either tensile or compressive strain.
After the extensometer is removed, measure the distance between the marks left by the gage points or knife edges.
If these are known and the temperature is known, then the low-temperature gage length can be calculated. We have no amendments or corrections for this standard.
During each run, displace the extensometer to the maximum positive value, then to the maximum negative value, and then back to zero, stopping at each veri? Two examples of this procedure are presented in Appendix X1. It is recommended that the same environmental chamber furnace or cryostat be used for the veri? For variable gage length extensometers, state the gage lengths veri?
Type 1; Type 2; and Type 3. Error of StrainB not to Exceed the Greater of: Extensometer systems are classified on the basis of the magnitude of their errors. E 83 — 06 Standard Practice for Veri? Extensometer systems shall be classified in accordance with the requirements as to maximum error of strain indicated: For an extensometer with a gage length of 1 in. Allow sufficient time for the veri?
It is naive to perform a static veri?
NOTE 1—Bonded resistance strain gages directly bonded to a specimen cannot be calibrated or veri? They result from the following characteristics: If the extensometer is used with closed loop test equipment in strain control, the backlash awtm result in large tension or compression loads during the initial part of the loading curve.
Extensometers that contain large mechanical elements may have inertial effects which at high frequencies cause forces on the attachment points to the specimen. Please first verify your email before subscribing to alerts.
This standard is also available to be included in Standards Subscriptions. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory aetm prior to use.
ASTM E83 – 16
If readout devices are always used in combination, individual veri? The actual lowtemperature gage length would sstm different since the material would change in length according to its coefficient of expansion characteristics.
Maintain temperature stability by excluding drafts throughout the subsequent veri? Repair or replace parts as necessary.
ASTM E83 – 16 – Standard Practice for Verification and Classification of Extensometer Systems
Aliasing can also be a factor in digital systems. In such cases, the extensometer system shall be veri? As the voice of the U. These forces can lead to slipping of the extensometer which will give errors in strain.
Note 1—Bonded resistance strain gauges directly bonded to a specimen cannot be calibrated or verified with the apparatus described in this practice for the verification of extensometers having definite gauge points. They may be veri? For extensometers that attach directly to the specimen, the veri? Extensometer systems shall be categorized in three types according to gage length: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
NOTE 3—The e3 is an example of an indirect method. Although this information is seldom adequate to allow the user to ignore errors due to their speci?
ASTM E83 – 10a Standard Practice for Verification and Classification of Extensometer Systems
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An extensometer that does not attach directly to the specimen should be moved away from the veri? This appendix is not intended to provide speci?
See procedures as described in Test Methods E Determine and record the error from each measurement, which is the difference between the measured gage length and the speci?
Strain displacements in each atm are to ashm approximately 1: A strain-gaged specimen can be used as a reference, or a specimen with known properties could be used to verify the extensometer results.