Halsen, Kjell Olav, and Heier, Espen. Calgary, Alberta, Canada. October 4—8, One problem that has been encountered when performing Drop Weight Tear Testing of high toughness TMCP materials is that the pre-deformed material in the pressed notch is not sufficiently embrittled to ensure initiation of a brittle fracture. According to prevailing standards a brittle initiation is necessary for a valid test result. The material opposite the notched side impact side will deform quite considerably and is due to strain hardening expected to loose toughness prior to the actual fracture initiation takes place.
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Drop weight tear testing is a material characterisation test aimed at avoiding brittle fracture and ensuring crack arrest in pipelines seamless or welded.
The specimen is of the full material thickness but up to 19mm only , contains a shallow pressed notch and is loaded in three point bending. A series of specimens is broken under impact loading at a variety of temperatures and the proportions of ductile fracture shear and cleavage on the fracture surfaces are measured.
In this way, a transition curve of percentage shear versus temperature is constructed for the material, see Fig. From correlations with full-scale pipe burst tests, a transition temperature corresponding to between 70 and 80 percent shear is normally stipulated in application standards at or below the minimum operating temperature together with a supplementary minimum Charpy energy requirement to avoid low tearing energy materials. Successful service of pipelines has validated this approach for the avoidance of brittle fracture in pipelines Eiber, The successful service record of pipelines qualified using the test and the less than perfect correlation of Charpy properties with crack propagation and arrest behaviour supports its continued use as a qualification test for pipeline material.
Support for SMEs. Software Products. Go to Technical knowledge Search. Login Login. Members' Portal. What is the drop-weight tear test? From Willoughby From Eiber References Eiber R J: 'Correlation of full-scale tests with laboratory tests'. AGA Symposium on line-pipe research.
American Gas Association, Dallas, , pp American Society for Testing and Materials. For more information please email: contactus twi.
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What is the drop-weight tear test?
API RP 5L3 Recommended Practice for Conducting Drop-Weight Tear Tests on Line Pipe, 4th Edition
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