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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Stress calculations by this practice are not applicable to plastically stressed specimens. Thus, the following procedure can be used to determine the specimen length L that is required to produce a given maximum stress s: This g339 is subject to revision at any time by the responsible technical committee and must be reviewed every?

In addition to the cracking time the following data shall be reported: From the contact with the spacer the stress decreases linearly toward zero at the ends of specimens. Stress calculations by this practice are not applicable to plastically stressed specimens.

To protect personnel and to prevent specimen loss, drill holes in specimen ends and holders and secure the specimens by wires to their holders.

It is desirable to remove the required amount of metal in several steps by alternately grinding opposite surfaces. The thickness of the specimen is usually dictated by the mechanical properties of the material and the product form available.

On the other hand, magnitude and direction of residual stresses frequently are difficult to predict and also difficult to measure. In these instances metallographic sectioning of the specimen may be necessary to detect cracks. The applied stress is determined from the size of the specimen and the bending de? A detailed discussion is given by Loginow 6. The inch-pound units in parentheses are provided for information. In some cases for example, very thin sheet or small diameter wire it is possible to form a U-bend and produce only elastic ast.

The inch-pound equivalents in parentheses are provided for information. In both sustained and alternate immersion, the solution volume should be large enough to prevent atsm of corrosive agents. NOTE 3—Specimen holders can be modi?

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Depending on the degree of restraint, residual stresses may even exceed the initial yield strength of the t39. To stress two-point loaded specimens Fig. Personnel installing and examining specimens should be cognizant of this possibility and be protected against injury.

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. Due to high stresses in a specimen, these pieces may leave the specimen at high velocity and can be dangerous. This equation is a special case of Stress calculations by this practice are not applicable to plastically stressed specimens. Satm is most useful for detecting large differences between the stress-corrosion cracking resistance 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.

This equation can be solved by computer, by trial and error, or by using a series expansion of the sine function. In sheet-gage bent-beam specimens the de?

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Thus, the use of the elastically stressed bent-beam specimens for materials evaluation is of limited value. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

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It is the nature of these practices that only the applied stress can be calculated. The equations must not be used above the yield strength of the material. NOTE 5—In atmospheres gas galvanic action between specimen and holder either does not exist or is con?

However, if many cracks are present, a change in shape may not be apparent. Care must be taken to prevent the identi? The common parameter in these equations asgm the modulus k of the elliptic integrals.

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All Standards Related to G39

However, if this is done, the approximate specimen proportions should be preserved to give a similar stress distribution for instance, if the length is doubled the width should be doubled also. 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. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

NOTE 2—The double-beam specimen, more fully described in For plate material the bent-beam specimen is more difficult to use, because more rugged specimen holders must be built to accommodate the 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. Please contact us if you need any help. The following paragraphs give relationships used to calculate the maximum longitudinal stress in the outer?

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.

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In elevated-temperature tests, make arrangements to re? Summary of Practice 4. Permission rights to photocopy the standard may also be secured from the ASTM g93 www. Link to Active This link will always g9 to the current Active version of the standard. As noted in 7. To facilitate calculations, a computer can be used to generate a table for a range of strain?

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.