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1.1 Fracture toughness is a key property for a number of aluminum alloys utilized in aerospace and process industries. Fracture toughness testing is often required for supplier qualification, quality control, and material release purposes. The purpose of this practice is to provide uniform test procedures for the industry, pointing out which current standards are utilized in specific cases, and providing guidelines where no standards exist. This practice provides guidance for testing (a) thin products, of thicknesses equivalent to sheet that is 0.249 in. (6.32 mm), (b) intermediate thicknesses of plate, forgings, and extrusions, too thin for valid plane-strain fracture toughness testing but too thick for treatment as sheet, for example, over 0.249 in. (6.32 mm) and up to 1 to 2 in. (25 to 50 mm), dependent upon toughness level, and (c) relatively thick products where Test Method E 399 is applicable.

1.2 This practice addresses both direct measurements of fracture toughness and screening tests, the latter recognizing the complexity and expense of making formal fracture toughness measurements on great quantities of production lots.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values in SI units given in parenthesis are provided for information purposes only.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

 

Document History

  1. ASTM B646-19


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Most Recent
  2. ASTM B646-17


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  3. ASTM B646-12


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  4. ASTM B646-06a


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  5. ASTM B646-06


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  6. ASTM B646-04

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    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  7. ASTM B646-03


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version
  8. ASTM B646-97


    Standard Practice for Fracture Toughness Testing of Aluminum Alloys

    • Historical Version