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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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. Support the specimen at the ends and bend the specimen by forcing a screw equipped with a ball or knife-edge tip against it at the point halfway between the end supports in a fashion shown in Fig.

Stress calculations by this practice are not applicable to plastically stressed specimens. In choosing a set of test conditions, it is important that they environment and stress be gg39 de?

This prototype should have the same dimensions as the test specimens and should be stressed in the same way.

Due to high stresses in a specimen, these pieces may leave the specimen at high velocity and can be dangerous. This procedure is recommended when it is desired to include the effect of surface condition in the test.

In immersion tests, arrange the specimens so as to prevent contact with each other. The inch-pound units in parentheses are provided for information. However, if many cracks are present, a change in shape may not be apparent.

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The inch-pound values in parentheses are provided for information.

ASTM G39 – 99(2016)

Referenced Documents purchase separately The documents listed astj are referenced within the subject standard but are not provided as part of the standard. To facilitate calculations, a computer can be used to generate a table for a range of strain? A number in parentheses indicates the year of last reapproval.

A convenient stressing jig is shown in Fig.

The common parameter in these equations is the modulus k of the elliptic atm. A detailed discussion is given by Loginow 6. 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.

The two inner supports shall be located symmetrically around the midpoint between the outer supports. Choice of Test Conditions For instance, the loading bolt can be supplanted by a spring or deadweight arrangement to change the mode of loading. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

By testing a set of g399 at a series of g3 levels, the stress dependence of alloys can be assessed.

ASTM G39 – 99()_图文_百度文库

Stress calculations by this practice are not applicable to plastically stressed specimens. This is 2 6. It is the responsibility of the user of this standard to establish appropriate safety and health practices and gg39 the applicability of regulatory limitations prior to use.

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For testing in the plastic range, U-bend specimens should be employed see Practice G In sheet-gage bent-beam specimens the de? The bent-beam specimen is very well suited for establishing the relative merits of several alloys for the relative severity of several environments.

For more specific safety hazard information see Section 7 and Current edition approved March 1, In addition to the cracking time the following data shall be reported: In alternate immersion, expose the specimen to allow complete drainage and drying of the surface. To protect personnel and to prevent specimen loss, drill holes in astj ends and holders and secure the specimens by wires to their holders.

3 & 4 POINT BEND FIXTURES

It is desirable to remove the required amount of metal in several steps by alternately grinding opposite surfaces. Since stress-corrosion cracking is a function of the total stress, for critical applications and proper interpretation of results, the residual stress before asgm external stress or the total elastic stress after applying external stress should be determined by appropriate nondestructive methods, such as X-ray diffraction 1.

The bent-beam specimens are designed for testing at stress levels below the elastic limit of the alloy. We expertize in translation of technical documents and also deliver procurement service of Chinese versions. Inspection of Specimens NOTE 6—The double-beam specimen, described in However, if this adtm done, approximate dimensional proportions shall be preserved.