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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Corrosion 14, 11 p.
This practice 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. 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. 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.
In alternate immersion, expose the specimen to allow complete drainage and drying of the surface. The actual bending stress there will be greater by a concentration factor dependent on the notch geometry, than the minimal test stress, and generally, may be expected to be in the range of plastic stain.
ASTM G39 – 99(2016)
This can be accomplished by mounting the specimen holders on appropriate racks and exposing the entire rack to the environment. Your comments will receive careful consideration at a meeting of the responsible satm committee, which you may attend. It is desirable to remove the required amount of metal in several steps by alternately grinding opposite surfaces.
This practice is applicable to specimens of any metal axtm 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 specimens shall be approximately 25 by mm 1- by in.
Since stress-corrosion cracking is a function of the total stress, for critical applications and proper interpretation of results, the residual stress before applying external stress or the total elastic stress after applying external stress should be determined by appropriate nondestructive methods, such as X-ray diffraction 1. To facilitate calculations, a computer can be used to generate a table for a range of strain?
Typical specimen holder con? astk
The inch-pound units in parentheses are provided for information. Calculations for transverse stress or edge-to-edge variation of longitudinal stress are not given; the asttm dimensions are chosen to minimize these stresses consistent with convenient 3 FIG.
Due to high stresses in a specimen, these pieces may leave the specimen at high velocity and can be dangerous. Y39 can be estimated from known creep data for the specimen, holder, and insulating materials.
Choice of Test Conditions 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.
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. Link to Active This link will always route to the current Active version of the standard.
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. From the contact with the spacer the stress decreases linearly toward zero at the ends of specimens.
The following paragraphs give relationships used to calculate the maximum longitudinal stress in the outer? A detailed discussion is given by Loginow 6.
ASTM G39 – 99()_图文_百度文库
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? By testing a set of specimens at a series of stress levels, the stress dependence of alloys can be assessed.
However, if this is done, approximate dimensional proportions shall be preserved. Summary of Practice 4. However, if many cracks are present, a change in shape may not be apparent. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. If this condition occurs, either eliminate the crevice or consider a different kind of specimen. The specimen dimensions given here can be modi? Permission rights to photocopy the standard may also be secured from the ASTM website www.
Therefore, the use of bent-beam specimens in the plastic range is not recommended for general use.
Historical Version s – view previous versions of standard.