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
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Extensometer systems shall be categorized in three types according to gage length: NOTE 8—If aastm connection between the gage points attached to the specimen and the indicating device is made through geared wheels or micrometer screws, relatively large periodic errors may exist which might not be disclosed by this overall procedure.
Set the extensometer to its starting position and mount it on a soft rod of the typical specimen size or diameter.
The changes in length shall be measured, for example, by means of an interferometer, calibrated standard gage blocks and an indicator, a calibrated micrometer screw, or a calibrated laser astmm system.
The calibration procedure may include adjustment of span or determination of aastm factor, or both. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
The component due to the extensometer system resolution at 10 mm, uR1 is: This will insure similar thermal and optical conditions exist and, hence, similar effects on the strain measurement should be observed. B The strain of zstm Extensometer System is the ratio of applied extension to the gage length.
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Please first log in with a verified email before subscribing to alerts. This can best be accomplished by verifying each system extensometer and readout device individually and also in combinations that would be used simultaneously. This standard is also available to be included in Standards Subscriptions. This practice covers procedures for the verification and classification of extensometer systems, but it is not intended to be a complete purchase specification. For variable gage length extensometers, state the gage lengths veri?
In general, both the amplitude and phase of the instrument may e8 as a function of frequency effects. The actual lowtemperature gage length would be different since the material would change in length according to asfm coefficient of expansion characteristics.
Although this kind of device usually has a stated accuracy of gage length, it must be veri? See procedures as described in Test Methods E Time Interval Between Veri?
ASTM Ea – Standard Practice for Verification and Classification of Extensometer Systems
If start-up backlash is evident, the veri? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Repair or replace parts as necessary. If the reading does not return to zero, adjust and repeat the procedure until the reading does return to zero. E 83 — 06 Standard Practice for Veri?
ASTM E83 – 16
NOTE 6—When autographic extensometer systems are used, care should be taken to minimize errors introduced by variances satm the graph paper. Already Subscribed to this aztm. If the extensometer is used with closed loop test equipment in strain control, the backlash could result in large tension or compression loads during the initial part of the loading curve.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and e883. It is not the measurement uncertainty of the extensometer or the measurement uncertainty of test results determined using the extensometer.
Need more than one copy? Spot checks may be performed on ranges of interest or at strain levels of interest utilizing a veri? The maximum allowable error in each class is the? The precision associated with gage length setting for a Type 2 extensometer should be speci?
They may be veri? If the extensometer is used with open or closed loop-type test equipment in load control, the users should disregard readings taken during the initial part of the loading curve. It is naive to perform a static veri? A possible method to verify this at high temperature is the use of a precision reference specimen with known gage length placement of marks or? Historical Version s – view previous versions of standard. Unless it can be demonstrated that autographic extensometers and recorders of a given type may be used interchangeably without introducing errors that would affect the classi?
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement astn such rights, are entirely their own responsibility.