Standard Test Method for Drop-Weight Tear Tests of Ferritic Steels This standard is issued under the fixed designation E , the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last rcapproval. A superscript epsilon f indicate5 an editorial change since. Test Method E
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Standard Test Method for Drop-Weight Tear Tests of Ferritic Steels This standard is issued under the fixed designation E , the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
A number in parentheses indicates the year of last rcapproval. A superscript epsilon f indicate5 an editorial change since. Test Method E It is the to prevent sidewise rotation of the specimen. Test Specimen 2. Referenced Document 5. Figure 1 presents the dimensions Determine Nil-Ductility Transition Temperature of and tolerances of the specimens. The specimens shall be Ferritic Steels2 removed from the material under test by sawing, shearing, or flame cutting, with or without machining.
Machined notches are prohibited. When many 3. Procedure on the mode of fracture propagation. I and 6. Separate the specimens by a distance at least equal correlations have been established with service behavior.
Make provision for circulation of the bath to assure uniform bath temperature. The machine specimens. If the found that up to 27 12 J ft -lbf of energy may be specimens are held out of the bath longer than 10 s return them unbroken to the bath for a minimum of 10 min.
Fublisbed October Originally publisbed as E - 7 1 T. Last previous edition E - 74 Also, center the notch in the specimen between the supports on the anvil. This length of fracture used to NOTE 5-Buckling has been experienced with specimen thicknesses detertie c.? Specimen Evaluation 7. The cleavage fractures generally extend from the root of the notch and are c denotes the cleavage appearing regions surrounded by a region of shear or shear lips on the specimen surface. Alternative fracture surface for a distance of one specimen thickness methods more adaptable to routine rating are described in from the root of the notch and the fracture surface for a 7.
Figure 2 illustrates in the cross-hatched area paring the fracture surfaces with a calibrated set of photo- that portion of the fracture surface to be considered in the graphs of previously fractured specimens or with actual evaluation of the percent shear area of the fracture surface.
Calibrate in accordance with 7. On specimens of this type the results equivalent to those obtained in 7. The shear area 60F. The bright regions of the fracture are the cleavage included in the rating of specimens of this type shall be that fracture areas and the darker gray regions are the areas of shown in the cross-hatched area of Fig. This fracture appearance is typical of a full shear fracture surface with a planimeter on a photograph or optical fracture and is easily distinguished from the flat cleavage projection of the fracture surface.
Then divide the cleavage fracture in the center of the specimen with shear lips at the area by the net area of the specimen included in the rating, specimen surfaces. Report of the procedure in Test Method E for measuring the 8. In the absence of such a the fracture appearance percent shear area of each spec- true value, no meaningful statement can be made concerning imen.
If a series of specimens is broken over a range of bias of data. Keywords Precision and Bias fracture appearance; impact loading; percent shear area 9. Some of the approximates the cleavage fracture surface configuration methods such as photographing and planimetering the frac- with reasonable accuracy.
The procedure outlined herein has been A1. From these dimensions the area of rapid method of measuring the percent shear area. Subtracting this from the net area of the fracture depends upon the configuration of the fracture surface.
Figure A 1. Figures A 1. Convert the results to percent by This procedure results in the following equation which multiplying by OX- de. Percent Shear Area. Request RR: E The Amwkan Society for Testing and hlatwials takes no psititm respecting thevatidtty of any ptent rights asserted in connection with any item mentioned in this standard.
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ASTM E436 – Drop-Weight Tear Tests for Ferritic Steels
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.
ASTM E436 - 03(2014)