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1.1''This practice covers procedures for making and using U-bend specimens for the evaluation of stress-corrosion cracking in metals. The U-bend specimen is generally a rectangular strip that is bent 180'' around a predetermined radius and maintained in this constant strain condition during the stress-corrosion test. Bends slightly less than or greater than 180'' are sometimes used. Typical U-bend configurations showing several different methods of maintaining the applied stress are shown in Fig. 1.

FIG. 1''Typical Stressed U-bends

Typical Stressed U-bendsTypical Stressed U-bends

1.2''U-bend specimens usually contain both elastic and plastic strain. 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. However, bent-beam (Practice G39 or direct tension (Practice G49)) specimens are normally used to study stress-corrosion cracking of strip or sheet under elastic strain only.

1.3''This practice is concerned only with the test specimen and not the environmental aspects of stress-corrosion testing, which are discussed elsewhere (1)2 and in Practices G35, G36, G37, G41, G44, G103 and Test Method G123.

1.4''The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.5''This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 

Document History

  1. ASTM G30-22

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    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Most Recent
  2. ASTM G30-97(2016)


    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Historical Version
  3. ASTM G30-97(2015)


    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Historical Version
  4. ASTM G30-97(2009)


    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Historical Version
  5. ASTM G30-97(2003)


    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Historical Version
  6. ASTM G30-97


    Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

    • Historical Version