ASTM G39 PDF

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

Inspection qstm Specimens Active view current version of standard. Thus, the use of the elastically stressed bent-beam specimens for materials evaluation is of limited value. This is 2 6. 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.

Testing at nominal or design conditions could be misleading.

ASTM G39 – 99()_图文_百度文库

Due to high stresses in a specimen, these pieces may leave the specimen at high velocity and can be dangerous. By proper choice of holder and insulator materials, however, many plastics can be used, aetm in short-time tests. The equations must not be used above the yield strength of the material.

This practice minimizes warpage due to residual stresses caused by machining. A number in parentheses indicates aatm year of last reapproval. If it should exceed the proportional limit, the measured de?

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

Stressed Coupons

Care must be taken to prevent the identi? 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.

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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. 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.

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. In these instances the critical areas should be packed with a hydrophobic?

Stressed Coupons

The bent-beam specimens are designed for testing at stress levels below the elastic asm of the alloy. NOTE 3—Specimen holders can be modi? By testing a set of specimens at a series of stress levels, the stress dependence of alloys can be g399. Link to Active This link will always route to the current Active version of the standard. In immersion tests, arrange the specimens so as to prevent contact with each other.

NOTE 7—Occasionally two-point loaded specimens having a nonuniform cross section are used for special purposes. An equivalent procedure for bolted specimens is described on pp. An engineering structure, because of residual stresses, is expected to be stressed to its yield strength at some points even if the design stress for that structure is appreciably below yield strength. A specimen thickness of about 0.

The stressed specimens then are exposed to the test environment and the time required for cracks to develop is determined. For more specific safety hazard information see Section 7 and The following paragraphs give relationships used to calculate the maximum longitudinal stress in the axtm Historical Version s – view previous versions of standard.

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ASTM G39 – 99(2016)

In both sustained and alternate immersion, the solution volume should be large enough to prevent depletion of corrosive agents. For plate material the bent-beam specimen is more difficult to use, because more rugged specimen holders must be built to accommodate the specimens. Bend the strips against each other over a centrally located spacer until both ends of the specimens touch.

In sheet-gage, bent-beam specimens the de? Originally approved in The inch-pound equivalents in parentheses are provided for information.

It is recommended that grinding or machining to a surface? Hold them in this position by welding the ends together as shown in Fig.

Current edition approved March 1, Thus, the following procedure can be used to determine the specimen length Atsm that is required to produce a given maximum stress s: A double-beam modification of a four-point loaded specimen to utilize heavier materials is described in Presence of cracks can be determined with or without optical, mechanical, or electronic aids.

Note 1-It is the nature of these methods that only the applied stress can be calculated. NOTE 5—In atmospheres gas galvanic action between specimen and holder either does not exist or is con? This procedure is recommended when it is desired to include the effect of surface condition in the test.