ASTM-E399 2012

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E399-12 Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials

Published By	Publication Date	Number of Pages
ASTM	2012	33

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

1.1 This test method covers the determination of fracture toughness ( K _Ic ) 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 ² 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 ) . ³ 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 K _Ic 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:

1.4 Specific requirements related to test apparatus:

1.5 Specific requirements related to individual specimen configurations:

1.6 Specific requirements related to special test procedures:

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.

Additional information

Test Record Analysis	9.1
Terminology	3
Specimen Size Estimates	7.1
Compact Specimen C(T)	Annex A4
Fatigue Machine	6.2
Crack Plane Orientation	3.1.3
Specimen Testing
Testing Fixtures	Annex A2
Specimen Size Validity Requirements	9.1.4
Apparatus (see also 1.4 )	6
Precision and Bias	11
Rapid-Force Testing	Annex A10
Precautions	5.1.1- 5.1.5
Loading Fixtures	6.3
Crack Size	8.2.3
Compact Specimen Loading Clevis	Annex A2.2
Crack Plane Angle	8.2.4
Reporting	10
Loading Rate	8.3
Stress-Intensity Factor	3.1.1
Fatigue Crack Starter Notches	7.3.1
Plane-Strain Fracture Toughness	3.1.2
Calculation and Interpretation of Results	9
Fatigue Precracking KIc Specimens	Annex A8
Width	8.2.2
General Procedure	8
Crack Extension Beyond Starter Notch	7.3.2.2
Arc-Shaped Tension Specimen A(T)	Annex A6
Practical Applications	5.2
Displacement Gage, Measurement	6.4
Specimen Measurements
Tension Machine	6.1
Arc-Shaped Bend Specimen A(B)	Annex A7
Standard and Alternative Specimen Configurations	7.2
Summary of Test Method	4
Bend Specimen SE(B)	Annex A3
Significance	5.1
P m a x /P Q Validity Requirement	9.1.3
	Section
Test Record	8.4
Referenced Documents	2
Hot-Pressed Beryllium Testing	Annex A9
Double-Cantilever Displacement Gage	Annex A1
Bend Specimen Loading Fixture	Annex A2.1
Disk-Shaped Compact Specimen DC(T)	Annex A5
Thickness	8.2.1
Significance and Use	5
Specimen Size, Configurations, and Preparation (see also 1.5 )	7
Fatigue Precracking (see also 1.6 )	7.3.2
ICS Codes	77.040.10 - Mechanical testing of metals

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ASTM-E399 2012

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