ASTM International - ASTM E399-06e1
Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials
|Publication Date:||15 December 2006|
|ICS Code (Mechanical testing of metals):||77.040.10|
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:
|Plane-Strain Fracture Toughness||3.1.2|
|Crack Plane Orientation||3.1.3|
|Summary of Test Method||4|
|Significance and Use||5|
|Apparatus (see also 1.4)||6|
|Displacement Gage, Measurement||6.4|
|Specimen Size, Configurations, and Preparation (see also 1.5)||7|
|Specimen Size Estimates||7.1|
|Standard and Alternative Specimen Configurations||7.2|
|Fatigue Crack Starter Notches||7.3.1|
|Fatigue Precracking (see also 1.6)||7.3.2|
|Crack Extension Beyond Starter Notch||184.108.40.206|
|Crack Plane Angle||8.2.4|
|Calculation and Interpretation of Results||9|
|Test Record Analysis||9.1|
Pmax/PQ Validity Requirement
|Specimen Size Validity Requirements||9.1.4|
|Precision and Bias||11|
1.4 Specific requirements related to test apparatus:
|Double-Cantilever Displacement Gage||Annex A1|
|Testing Fixtures||Annex A2|
|Bend Specimen Loading Fixture||Annex A2.1|
|Compact Specimen Loading Clevis||Annex A2.2|
1.5 Specific requirements related to individual specimen configurations:
|Disk-Shaped Compact Specimen
|Arc-Shaped Tension Specimen
|Arc-Shaped Bend Specimen
1.6 Specific requirements related to special test procedures:
|Fatigue Precracking KIc Specimens||Annex A8|
|Hot-Pressed Beryllium Testing||Annex A9|
|Rapid-Force Testing||Annex 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.