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1.1 This test method covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters: K, J, and CTOD (δ). Toughness can be measured in the R-curve format or as a point value. The fracture toughness determined in accordance with this test method is for the opening mode (Mode I) of loading.

1.2 The recommended specimens are single-edge bend, [SE(B)], compact, [C(T)], and disk-shaped compact, [DC(T)]. All specimens contain notches that are sharpened with fatigue cracks.

1.2.1 Specimen dimensional (size) requirements vary according to the fracture toughness analysis applied. The guidelines are established through consideration of material toughness, material flow strength, and the individual qualification requirements of the toughness value per values sought.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information 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.

Note 1 - Other standard methods for the determination of fracture toughness using the parameters K, J, and CTOD are contained in Test Methods E399, E813, E1152, E1290, and E1737. This test method was developed to provide a common method for determining all applicable toughness parameters from a single test.

A14.1.1 This annex covers the determination of the rate dependent JIc(t) and the J-integral versus crack growth resistance curve (J-R(t) curve) for metallic materials under conditions where the loading rate exceeds that allowed for conventional (static) testing, see Section 8.4.2.

A15.1.1 The normalization technique can be used in some cases to obtain a J-R curve directly from a force displacement record taken together with initial and final crack size measurements taken from the specimen fracture surface. Additional restrictions are applied (see A14.1.3) which limit the applicability of this method. The normalization technique is described more fully in Herrera and Landes (21) and Landes, et al. (22), Lee (23), and Joyce (20). The normalization technique is most valuable for cases where high loading rates are used, or where high temperatures or aggressive environments are being used. In these, and other situations, unloading compliance methods are impractical. The normalization method can be used for statically loaded specimens if the requirements of this section are met. The normalization method is not applicable for low toughness materials tested in large specimen sizes where large amounts of crack extension can occur without measurable plastic force line displacement.

 

Document History

  1. ASTM E1820-22e1


    Standard Test Method for Measurement of Fracture Toughness

    • Most Recent
  2. ASTM E1820-22


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  3. ASTM E1820-21


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  4. ASTM E1820-20b


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  5. ASTM E1820-20ae1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  6. ASTM E1820-20a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  7. ASTM E1820-20e1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  8. ASTM E1820-20


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  9. ASTM E1820-18ae1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  10. ASTM E1820-18a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  11. ASTM E1820-18


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  12. ASTM E1820-17a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  13. ASTM E1820-17


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  14. ASTM E1820-16


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  15. ASTM E1820-15ae1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  16. ASTM E1820-15a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  17. ASTM E1820-15


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  18. ASTM E1820-13e1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  19. ASTM E1820-13


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  20. ASTM E1820-11e2


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  21. ASTM E1820-11e1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  22. ASTM E1820-11


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  23. ASTM E1820-09e1

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    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  24. ASTM E1820-09


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  25. ASTM E1820-08a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  26. ASTM E1820-08


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  27. ASTM E1820-06e1


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  28. ASTM E1820-06


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  29. ASTM E1820-05a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  30. ASTM E1820-05


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  31. ASTM E1820-01


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version
  32. ASTM E1820-99a


    Standard Test Method for Measurement of Fracture Toughness

    • Historical Version