ASTM G39 PDF

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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3 & 4 POINT BEND FIXTURES

Active view current version of standard. 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. It should also be noted that presence of voluminous corrosion products may obscure cracks, thus making a careful examination mandatory.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. For plate material the bent-beam specimen is more difficult to use, because more rugged specimen holders must be built to accommodate the specimens. Users of this standard are expressly atsm that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This prototype should have the same dimensions as the test specimens and should be stressed in the same way. This practice applicable ast specimens of any asrm that are stressed to levels less than the elastic limit of the material, and therefore, the applied stress can be accurately calculated or 3g9 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. NOTE 8—If the test is to be conducted in an electrolyte, the spacer shall be made of the same material as the specimen or of an electrically nonconducting material such as glass, ceramic, and so forth to prevent galvanic action between specimen and spacer.

Calculations for transverse stress or edge-to-edge variation of longitudinal stress are not given; the specimen dimensions are chosen to minimize these stresses consistent with convenient 3 FIG. Presence of cracks can be determined with or without optical, mechanical, or electronic aids. Corrosion 14, 11 p. Last previous edition approved in as G39—99 If specimen holders or insulators are made of such materials, the applied stress on the specimen may change appreciably with time.

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The calculated stress applies only to the state of stress before initiation of cracks. It is desirable to remove the required amount of metal in several steps by alternately grinding opposite surfaces. For plate material the bent-beam specimen is more difficult to use because more rugged specimen holders must be built to accommodate the specimens.

Also, it is suggested that specimens be examined for cracks before exposure to the test environment. The inch-pound values in parentheses are provided for information.

Bend the strips against each other over a centrally located spacer until both ends of the specimens touch.

Link to Active This link will always route to the current Active version of the standard. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Stressed Coupons

NOTE 5—In atmospheres gas galvanic action between specimen and holder either does not exist or is con? Although it is possible to stress bent-beam specimens into the plastic range, the stress level cannot be calculated for plastically-stressed three- and four-point loaded specimens as well as the double-beam specimens. Since this corrosion site is very close to the point of highest tension stress, it may cathodically protect the specimen and prevent possible crack formation or cause hydrogen embrittlement.

This 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. By proper choice of holder and insulator materials, however, many plastics can be used, especially in short-time tests.

For more specific safety hazard information see Section 8 and The inch-pound units in parentheses are provided for information. 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. Stress calculations by this practice are not applicable to plastically stressed specimens. Although it is possible to stress bent-beam specimens into the plastic range, the stress level cannot be calculated for plastically-stressed three- and four-point loaded specimens as well as the double-beam specimens.

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Summary of Practice 4. This relationship can be used as a simple check to ensure that the maximum stress does not exceed the proportional limit.

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.

An equivalent procedure for bolted specimens is described on pp. If stenciling is used for identi? This practice minimizes warpage due to residual stresses caused by machining. By testing a set of specimens at a series of stress levels, the stress dependence of alloys can be assessed. This equation is a special case of Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. This can be accomplished by mounting the specimen holders on appropriate racks and exposing the entire rack to the environment.

Permission rights to photocopy the standard may also be secured from the ASTM website www.

Stressed Coupons

Gg39, if many cracks are present, a change in shape may not be apparent. NOTE 3—Specimen holders can be modi? This prototype specimen should have the same dimensions as the test specimens and should be stressed in the same way. Personnel installing and examining specimens should be cognizant of this possibility and be protected against injury.

In some cases for example, very thin sheet or small diameter wire it is possible to form a U-bend and produce only elastic strain.

Historical Version s – view previous versions of standard. The prototype specimen should have the same dimensions as the test specimens and should be stressed in the same way.

The specimen is most easily made from strip or sheet but can be machined from plate, bar, castings, or weldments; wire specimens may be used also. Only chemicals appropriate for the given metal or alloy should be y39. The bent-beam specimens are designed for testing at stress levels below the elastic limit of the alloy.