Standards Related to G39 – G G Standard ASTM Standards Related to Corrosion Testing of Metals · Annual Book of ASTM Standards Online: Hello everyone, I am looking for ASTM G39 – 99() Standard Practice for Preparation and Use of Bent-Beam Stress- Corrosion Test Specimens. Please. ASTM G39 – 99() – 弯曲梁应力腐蚀试验试样制备和使用标准规程.
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The inch-pound units in parentheses are provided for information. The stress conditions are not usually known and a wide range of stresses exist in a single stressed specimen. All edges should be similarly ground or machined to remove cold-worked material from previous shearing.
In immersion tests, arrange the specimens so as to prevent contact with each other. It is the nature of these practices that only the applied stress can be calculated. Atm practice is applicable to specimens of any metal that are stressed to levels less than the elastic limit of the material, and therefore, the applied stress can be accurately calculated or measured see Note 1.
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. However, for meaningful ast, comparisons should be made only among tests employing crack detection methods of equivalent sensitivity.
Hold them in this position by welding the ends together as shown in Fig. This practice applicable to specimens of any metal that are stressed to levels less than the elastic limit of the material, and therefore, the applied stress can be accurately calculated or measured see Note 1.
This practice minimizes warpage due to residual stresses caused by machining. A convenient stressing jig is shown in Fig. This practice applicable to specimens of any metal that are stressed to levels less than the elastic limit of the material, and therefore the applied stress can be accurately calculated or measured Note 1. This equation can be solved by computer, by trial and error, or by using a series expansion of the sine function. It is most useful for detecting large differences between the stress-corrosion cracking resistance of a different metals in the same environment, b one metal in different metallurgical conditions in the same environment, or c one metal in several environments.
In these instances metallographic sectioning of g9 specimen may be necessary to detect cracks. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This equation is aastm special case of Bend the strips against each other over a centrally located spacer until both ends of the specimens touch.
Care must be taken to prevent the identi? To obtain more accurate stress values, use a prototype specimen, equipped with strain gages, for calibration.
As noted in 7. For testing in the plastic range, U-bend specimens should be employed see Practice G A number in parentheses indicates the year of last reapproval.
Stressed Coupons
Once cracking is initiated, the stress at the tip of the crack, as well as in uncracked areas, has changed. At stresses above the elastic limit, but below the engineering yield strength 0. Link to Active This link will always route to the current Active version of the standard. A detailed discussion is given by Loginow ast. This can be accomplished by mounting the specimen holders on appropriate racks and exposing the entire rack to the environment. Relaxation can aetm estimated from known creep data for the specimen, holder, and insulating materials.
The equations must not be used above the yield strength of the material. In both sustained and alternate immersion, the solution volume should be large enough to prevent depletion of corrosive agents.
A double-beam modification of a four-point loaded specimen to utilize heavier materials is described in The inch-pound equivalents in parentheses are provided for information.
All Standards Related to G39
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. Users of this standard are expressly advised that determination of the validity of any such patent rights, asm the risk of infringement of such rights, are entirely their own responsibility.
In elevated-temperature tests, make arrangements to re? If the specimen contains only one or a few cracks, the shape of the bend can be considerably changed, predominantly by kinking; this feature helps in identifying cracked specimens. 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. Support the specimen at the ends and bend the specimen by forcing two inner supports against it in a fashion shown in Fig.
A double-beam modification of a four-point specimen to utilize heavier materials is described in 3g9 For plate material the bent-beam specimen is more difficult to use because more rugged specimen holders must be built to accommodate the specimens. This is 2 6.
Residual stresses are frequently the more important, primarily because current design practices and close control of processes have kept operational stresses well below the yield strength of the metal in use. Therefore, the use of bent-beam specimens in the plastic range is not recommended for general use.
The stresses in an engineering structure can be varied between operational design stresses and residual stresses from asttm treatment or fabrication. NOTE 3—Specimen holders can be modi? This cracking time is used as a measure of the stress-corrosion resistance of the material in the test environment at the stress level utilized.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
NOTE 5—In atmospheres gas galvanic action between specimen and holder either does not exist or is con?
A description of such a g3 is given by Wilson and Spier 5. On the other hand, magnitude and direction of residual stresses frequently are difficult to predict and also difficult to measure.
3 & 4 POINT BEND FIXTURES
Depending on the degree of restraint, residual stresses may even exceed the initial yield strength of the material. For plate material the bent-beam specimen is more difficult axtm use, because more rugged specimen holders must be built to accommodate the specimens.
The inch-pound values in parentheses are provided for information.