Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March ...

1 British Standard A single copy of this British Standard is Licensed to Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March 2004, Uncontrolled Copy, (c) BSI. Rupert Heygate-Browne 08 March 2004. This is an uncontrolled copy. Ensure use of the most current version of this document by searching British Standards Online at BRITISH STANDARD |. | BS 7448 : |. |. |. Part 2 : 1997. |. |. |. |. |. |. |. |. |. |. |. |. |. fracture mechanics toughness |. |. |. |. tests |. |. |. |. |. |. |. |. Part 2. Method for determination of KIc, |. |. |. critical CTOD and critical J values of |.

2 |. |. welds in metallic materials |. |. |. |. |. |. |. |. |. |. |. |. Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March 2004, Uncontrolled Copy, (c) BSI. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. |. ICS |. |. |. |. |. |. |. |. |. NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW. |. |. |. |. BS 7448 : Part 2 : 1997. Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ISE/NFE/4, Mechanical testing of metals, upon which the following bodies were represented: British Iron and Steel Producers Association British Non-ferrous Metals Federation British Railways Board Copper Development Association Electricity Association ERA Technology Ltd.

3 GAMBICA (BEAMA Ltd.). Institute of Materials Ministry of Defence National Physical Laboratory Society of British Aerospace Companies Limited Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March 2004, Uncontrolled Copy, (c) BSI. United Kingdom Accreditation Service University College London Welding Institute The following bodies were also represented in the drafting of the standard through subcommittees and panels: BEAMA Ltd. Castings Development Centre Lloyds Register of Shipping This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1997.

4 BSI 1997. Amendments issued since publication Amd. No. Date Text affected The following BSI references relate to the work on this standard: Committee reference ISE/NFE/4. Draft for comment 96/706339 DC. ISBN 0 580 27997 9. BS 7448 : Part 2 : 1997. Contents Page Foreword ii 1 Scope 1. 2 References 1. 3 Definitions 1. 4 Symbols and designations 2. 5 Principle 3. 6 Choice of specimen design, orientation and notch location 3. 7 Pre-machining metallography 3. 8 Machining 4. 9 Specimen preparation 5. 10 Test procedure for KIc, CTOD (or d) and J tests 5. 11 Post-test metallography 5.

5 12 Post-test analysis 6. 13 Test report 7. Annexes A (informative) Example notch locations 17. Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March 2004, Uncontrolled Copy, (c) BSI. B (informative) Example of pre-test metallography 19. C (informative) Example of post-test metallography 21. D (informative) Residual stress modification and precracking technique 22. E (normative) Assessment of pop-in 24. Figures 1 Test method flow chart for BS 7448 : Part 2 8. 2 Crack plane orientation code for welded fracture toughness specimens (defined relative to weld direction) 9. 3 Proportional dimensions and tolerances for rectangular section bend specimens and square section bend specimens 10.

6 4 Acceptable tolerances for misalignment, distortion and curvature in single edge notch bend specimens 11. 5 Method for straightening bend specimen blanks 12. 6 Notch placement procedure using construction lines in a through thickness notched specimen 13. 7 Notch placement procedure in a surface notched specimen 13. 8 Post-test sectioning procedure to identify microstructure at fatigue crack in a through-thickness notched specimen 14. 9 Post test sectioning of a surface notched specimen 15. 10 Measurement of s in an SM surface notched specimen 15. 11 Definition of h and 2h in double and single sided welds 16.

7 Examples of weld positional (WP) notch locations 17. Examples of specific microstructure notch locations 18. HAZ adjacent to columnar weld metal for idealized notch line on macrosection 19. Microstructural map of HAZ adjacent to columnar weld metal 20. Post-test microstructural map at the crack tip of a specimen notched into the HAZ in a carbon manganese steel 21. Alternative local compression treatments 23. Measurement of Dapop 24. Post-test sectioning procedure for identifying fracture initiation microstructure in a through-thickness notched specimen 25. Post-test sectioning for identifying fracture initiation microstructure in a surface notched specimen 26.

8 Measurement of d1 (along crack front) and d2 (not along crack front). microstructure in section taken from through-thickness notched specimens (slice B in figure ) 27. Measurement of microstructure d1 and Dapop in section taken from a surface notched specimen, see figure (example given for HAZ) 27. List of references Inside back cover BSI 1997 i BS 7448 : Part 2 : 1997. Foreword This Part of BS 7448 has been prepared by Technical Committee ISE/NFE/4. It gives a method for determining the fracture mechanics toughness of welded joints in metallic materials under displacement controlled monotonic loading.

9 This Part of BS 7448 extends the following Parts of this standard to cover welded joints: Part 1. Method for determination of KIc, critical CTOD and critical J values of metallic materials. Part 4. Method for determination of fracture resistance curves and initiation values for stable crack extension in metallic materials. NOTE. Part 4 is in preparation and will be published soon. It has been assumed in the drafting of this standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. CAUTION. It is important to note that tests of the type described involve the use of Licensed Copy: Rupert Heygate-Browne, Agip KOC, 08 March 2004, Uncontrolled Copy, (c) BSI.

10 Large forces, and may involve the rapid movement of machine parts and fractured test specimens. Therefore it is important to consider the safety of machine operators. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1. to 28, an inside back cover and a back cover. ii BSI 1997. BS 7448 : Part 2 : 1997. 1 Scope plane strain fracture toughness (KIc). This Part of BS 7448 specifies the specimen design, A measure of a material's resistance to crack preparation, method for notch placement and post extension when the stress state near the crack tip is test validation of the notch placement applicable to predominantly plane strain, plastic deformation is specimens prepared from welds ( specimens limited, and opening mode monotonic loading is testing the weld metal or heat affected zone).