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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Current edition approved March 1, To obtain more accurate stress values, use a prototype specimen, equipped with strain gages, for calibration. Wstm Documents purchase ashm The documents listed below are referenced within the subject standard but are not provided as part of the standard.

This is 2 6. The stresses in an engineering structure can be varied between operational design stresses and residual stresses from heat treatment or fabrication. By testing a set of specimens at a series of stress levels, the stress dependence of alloys can be assessed. NOTE 2—The double-beam specimen, more fully described in The two inner supports shall be located symmetrically around the midpoint between the outer supports.

A detailed discussion is given by Loginow 6. 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 procedure is recommended when it is desired to axtm the effect of surface condition in the test. 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.

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. In choosing a set of test conditions, it is important that they environment and stress be well de?

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Testing at nominal or design conditions could be misleading.

All Standards Related to G39

Typical specimen holder con? Presence of cracks g399 be determined with or without optical, mechanical, or electronic aids. For testing in the plastic range, U-bend specimens should be employed see Practice G NOTE 6—The double-beam specimen, described in To stress two-point loaded specimens Fig.

From the inner supports the stress decreases linearly toward zero at the outer supports.

Stressed Coupons

For more specific safety hazard information see Section 8 and It is recommended that grinding or machining to a surface? For testing in the plastic range, U-bend specimens should be employed see Practice G Only chemicals appropriate for the given metal or alloy should be used.

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. 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.

Once cracking has initiated, the state of stress at the tip of the crack as well as in uncracked areas has changed, and therefore, the known or calculated stress or strain values discussed in this practice apply only to the state of stress existing before initiation of cracks. Please contact us if you need any help.

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. 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. Due to high stresses in a specimen, these pieces may leave the specimen at high velocity and can be dangerous.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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Historical Version s – view previous versions of standard. However, if this is done, approximate dimensional asstm shall be preserved. 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.

Advantages of such a notched specimen include the probable localized cracking in the notch and an acceleration of failure. It is gg39 useful for detecting large differences between the stress-corrosion cracking resistance of a different metals in the same environment, b g399 metal in different metallurgical conditions in the same environment, or c one metal in several environments.

Once cracking is initiated, the stress at the tip of the crack, as well as in uncracked areas, has changed. To obtain more accurate stress values, use for calibration a prototype specimen equipped with strain gages. It is the responsibility of the user of this standard to establish appropriate safety and health practices asgm determine the applicability of regulatory limitations prior to use.

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.

The bent-beam specimens are designed for astk at stress levels below the elastic limit of the alloy. 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. The applied stress is determined from the size of the specimen and the bending de?

Link to Active This link will always route to the current Active version of the standard.