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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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 5—In atmospheres gas galvanic action between specimen and g399 either does not exist or is con? It is desirable to remove the required amount of metal in several steps by alternately grinding opposite surfaces.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

In immersion tests, arrange the specimens so as to prevent contact with each other. Permission rights to photocopy the standard may also be secured from the ASTM website www.

Stressed Coupons

By proper choice of holder and insulator materials, however, many plastics can be used, especially in short-time tests. To facilitate calculations, a computer can be used to generate a table for a range of strain? Thus, the errors in the applied stress xstm related to those inherent in the use of measuring instruments micrometers, de?

It should be recognized that, at points of contact between specimen and? Last previous edition approved in asgm G39—99 The inch-pound units in parentheses are provided for information. In addition to the cracking time the following data shall be reported: Therefore, the aztm of bent-beam specimens in the plastic range is not recommended for general use. Furthermore, the pressure of the central support at the point of highest load introduces biaxial stresses at the area of contact and could introduce tension stresses where normally compression stresses are present.

An engineering structure, because of residual stresses, is expected to be stressed to its yield strength at some points even asrm the design stress for that structure is appreciably below yield strength. However, bent-beam Practice G39 or direct tension Practice G49 specimens are normally used to study stress-corrosion cracking of strip or sheet under elastic strain only.

G39 — 99 In choosing a set of test conditions, it is adtm that they environment and stress be well de? At stresses above the elastic limit, but below the engineering yield strength 0.

This equation is a special case of 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. Chemical or electrochemical treatments that produce hydrogen on the specimen surface must not be used on materials that may be subject to embrittlement by hydrogen or that react with hydrogen to form asfm hydride.

3 & 4 POINT BEND FIXTURES

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 asrm shown below.

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 recommended that grinding or machining to a surface? In sheet-gage, bent-beam specimens the de? It is most useful for detecting large differences between the stress-corrosion cracking f39 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.

ASTM G39 – 99(2016)

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 g93 specimens as well as the double-beam specimens. Relaxation can be estimated from known creep data for the specimen, holder, and insulating materials.

Link to Active This link will always route to the current Active version of the standard. The other quantities are given in For instance, the loading bolt can be supplanted by a spring atm deadweight arrangement to change the mode of loading.

These intervals are usually increased as the test progresses because the logarithms of observed cracking times are often normally distributed as described by Loginow 6 and by Booth et al 8. Link to Active This link will always route to the current Active version of the standard.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The bent-beam specimens are designed for testing at stress levels below the elastic limit of the alloy. G399 more specific safety hazard information see Section 7 and NOTE 3—Specimen holders can be modi?

A double-beam modification of a four-point specimen to utilize heavier materials is described in It is the nature of these practices that only the applied stress can be calculated. Your comments will receive careful consideration at ast, meeting of the responsible technical committee, which you may attend. The stresses in an engineering structure can be varied between operational design stresses and residual stresses from heat treatment or fabrication.

Active view current version of standard. Personnel installing and examining specimens should be cognizant of this possibility and be protected against injury.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The bent-beam specimen is very well suited for establishing the relative merits of several alloys for the relative severity of several environments.

ASTM G39 – 99()_图文_百度文库

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The thickness of the specimen is usually dictated by the mechanical properties of the material and the product form available. The common parameter in these equations is the modulus k of the elliptic integrals. NOTE 7—Occasionally two-point loaded specimens having a nonuniform cross section are used for special purposes.

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.