Standard Historical Last Updated: Dec 31, 2010 Track Document
ASTM E399-09

Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials

Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials E0399-09 ASTM|E0399-09|en-US Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials Standard new BOS Vol. 03.01 Committee E08
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Significance and Use

The property KIc determined by this test method characterizes the resistance of a material to fracture in a neutral environment in the presence of a sharp crack under essentially linear-elastic stress and severe tensile constraint, such that (1) the state of stress near the crack front approaches tritensile plane strain, and (2) the crack-tip plastic zone is small compared to the crack size, specimen thickness, and ligament ahead of the crack.

Variation in the value of KIc can be expected within the allowable range of specimen proportions, a/W and W/B. KIc may also be expected to rise with increasing ligament size. Notwithstanding these variations, however, KIc is believed to represent a lower limiting value of fracture toughness (for 2 % apparent crack extension) in the environment and at the speed and temperature of the test.

Lower values of KIc can be obtained for materials that fail by cleavage fracture; for example, ferritic steels in the ductile-to-brittle transition region or below, where the crack front length affects the measurement in a stochastic manner independent of crack front constraint. The present test method does not apply to such materials and the user is referred to Test Method E 1921 and E1820 . Likewise this test method does not apply to high toughness or high tearing-resistance materials whose failure is accompanied by appreciable amounts of plasticity. Guidance on testing elastic-plastic materials is given in Test Method E 1820.

The value of KIc obtained by this test method may be used to estimate the relation between failure stress and crack size for a material in service wherein the conditions of high constraint described above would be expected. Background information concerning the basis for development of this test method in terms of linear elastic fracture mechanics may be found in Refs (1) and (3).

Cyclic forces can cause crack extension at KI values less than KIc. Crack extension under cyclic or sustained forces (as by stress corrosion cracking or creep crack growth) can be influenced by temperature and environment. Therefore, when KIc is applied to the design of service components, differences between laboratory test and field conditions shall be considered.

Plane-strain fracture toughness testing is unusual in that there can be no advance assurance that a valid KIc will be determined in a particular test. Therefore, compliance with the specified validity criteria of this test method is essential.

Residual stresses can adversely affect the indicated KQ and KIc values. The effect can be especially significant for specimens removed from as-heat treated or otherwise non-stress relieved stock, from weldments, from complex wrought parts, or from parts with intentionally induced residual stresses. Indications of residual stress include distortion during specimen machining, results that are specimen configuration dependent, and irregular fatigue precrack growth (either excessive crack front curvature or out-of-plane growth). Guide B 909 provides supplementary guidelines for plane strain fracture toughness testing of aluminum alloy products for which complete stress relief is not practicable. Guide B 909 includes additional guidelines for recognizing when residual stresses may be significantly biasing test results, methods for minimizing the effects of residual stress during testing, and guidelines for correction and interpretation of data.

This test method can serve the following purposes:

In research and development, to establish in quantitative terms significant to service performance, the effects of metallurgical variables such as composition or heat treatment, or of fabricating operations such as welding or forming, on the fracture toughness of new or existing materials.

In service evaluation, to establish the suitability of a material for a specific application for which the stress conditions are prescribed and for which maximum flaw sizes can be established with confidence.

For specifications of acceptance and manufacturing quality control, but only when there is a sound basis for specifying minimum KIc values, and then only if the dimensions of the product are sufficient to provide specimens of the size required for valid KIc determination. The specification of KIc values in relation to a particular application should signify that a fracture control study has been conducted for the component in relation to the expected loading and environment, and in relation to the sensitivity and reliability of the crack detection procedures that are to be applied prior to service and subsequently during the anticipated life.

FIG. 2 DoubleCantilever Clip-In Displacement Gage Showing Mounting by Means of Integral Knife Edges
(Gage Design Details are Given in Annex A1)


1.1 This test method covers the determination of fracture toughness (KIc) of metallic materials under predominantly linear-elastic, plane-strain conditions using fatigue precracked specimens having a thickness of 1.6 mm (0.063 in.) or greater subjected to slowly, or in special (elective) cases rapidly, increasing crack-displacement force. Details of test apparatus, specimen configuration, and experimental procedure are given in the Annexes.

Note 1—Plane-strain fracture toughness tests of thinner materials that are sufficiently brittle (see 7.1) can be made using other types of specimens (1). There is no standard test method for such thin materials.

1.2 This test method is divided into two parts. The first part gives general recommendations and requirements for KIc testing. The second part consists of Annexes that give specific information on displacement gage and loading fixture design, special requirements for individual specimen configurations, and detailed procedures for fatigue precracking. Additional annexes are provided that give specific procedures for beryllium and rapid-force testing.

1.3 General information and requirements common to all specimen configurations:

Referenced Documents2
Stress-Intensity Factor3.1.1
Plane-Strain Fracture Toughness3.1.2
Crack Plane Orientation3.1.3
Summary of Test Method4
Significance and Use5
Practical Applications5.2
Apparatus (see also 1.4)6
Tension Machine6.1
Fatigue Machine6.2
Loading Fixtures6.3
Displacement Gage, Measurement6.4
Specimen Size, Configurations, and Preparation (see also 1.5)7
Specimen Size Estimates7.1
Standard and Alternative Specimen Configurations7.2
Fatigue Crack Starter Notches7.3.1
Fatigue Precracking (see also 1.6)7.3.2
Crack Extension Beyond Starter Notch7.3.2.2
General Procedure8
Specimen Measurements
Crack Size8.2.3
Crack Plane Angle8.2.4
Specimen Testing
Loading Rate8.3
Test Record8.4
Calculation and Interpretation of Results9
Test Record Analysis9.1
Pmax/PQ Validity Requirement9.1.3
Specimen Size Validity Requirements9.1.4
Precision and Bias12

1.4 Specific requirements related to test apparatus:

Double-Cantilever Displacement GageAnnex A1
Testing FixturesAnnex A2
Bend Specimen Loading FixtureAnnex A2.1
Compact Specimen Loading ClevisAnnex A2.2

1.5 Specific requirements related to individual specimen configurations:

Bend Specimen SE(B)Annex A3
Compact Specimen C(T)Annex A4
Disk-Shaped Compact Specimen DC(T)Annex A5
Arc-Shaped Tension Specimen A(T)Annex A6
Arc-Shaped Bend Specimen A(B)Annex A7

1.6 Specific requirements related to special test procedures:

Fatigue Precracking KIc SpecimensAnnex A8
Hot-Pressed Beryllium TestingAnnex A9
Rapid-Force TestingAnnex A10

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

1.8 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.

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Book of Standards Volume: 03.01
Developed by Subcommittee: E08.07
Pages: 33
DOI: 10.1520/E0399-09
ICS Code: 77.040.10