Significance and Use
This test practice provides a recommended procedure for preparing fracture toughness specimens from welds to improve the likelihood of obtaining useful fracture toughness values.
The subsequent fracture toughness values, that have significance and use as stated in the applicable ASTM test method, may allow for flaw tolerance assessments of welded structures. Flaw tolerance assessments require an understanding and compensation for the differences that may exist between laboratory test results and field conditions.
The shallow-notched specimen testing procedures described in Annex E of ISO 15653 may be used by agreement between the parties involved as long as it is understood that Annex E is “Informative” and the result is a geometry dependent measurement of toughness that is not validated by the applicable test standard.
1.1 This practice provides methods for preparing specimens from welds in metallic materials and interpreting subsequent test results when used in conjunction with standards Test Methods E1290 and E1820 for the determination of fracture toughness. The fatigue pre-cracking procedures included in this practice may also be used to aid in preparing straight pre-cracks for weld specimens in accordance with Test Method E1681.
1.2 This practice draws heavily from ISO 15653: Metallic materials – Method of test for the determination of quasistatic fracture toughness of welds. All references to ISO 12135 in that test method should be replaced with the applicable ASTM Test Methods (E1820, E1290 or E1681).
1.3 The recommended specimen is a single-edge bend [SE(B)] with width, W, equal to twice the specimen thickness, B. An alternate SE(B) specimen with W/B equal to one and a span, S, to W ratio of 4 may be used but may produce different toughness values. A compact tension [C(T)] specimen may be used if it can be demonstrated that the analysis of results properly accounts for weld-to-base metal strength mismatch effects on fracture toughness.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ISO15653 Metallic materials-Method of test for the determination of quasistatic fracture toughness of welds
E8/E8M Test Methods for Tension Testing of Metallic Materials
E1290 Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
E1681 Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
E1820 Test Method for Measurement of Fracture Toughness
E1823 Terminology Relating to Fatigue and Fracture Testing
fracture toughness; heat affected zone; hydrogen release; overmatched; post-test metallography; residual stress; shallow-crack; SE(B); undermatched; welds;
ICS Number Code 25.160.40 (Welding joints and welds)
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