Fine Scientific Instrument

IS 1717: 2012ISO 7800: 20037 Procedure7.1 Place the test piece in the testing machine (4.2) in such a way that its longitudinal axis coincides withthe axis of the grips (4.1) and so that it remains straight during the test. Unless otherwise specified this maybe ensured by applying to the test piece a constant tensile stress not exceeding 2 % of the nominal tensilestrength of the wire.7.2 After placing the test piece in the testing machine, rotate one grip at a reasonable constant speed untilthe test piece breaks or until a specified number of turns, N, is reached. Count the number of complete turnsimparted to the wire by the rotating gripNOTEFor verification of number of turns, a coloured surface line should be drawn.7.3 Unless otherwise specified in the relevant standard, the speed of testing shall not exceed the valuesgiven in Table 3, in the case of steel, copper and copper alloys, aluminium and aluminium alloys of thediameters given.NOTEBecause the simple torsion test is an isothermal test, an essental increasing of temperature of the test pieceshould be avoided. The temperature increase should not be higher than 60 "C.7.4 If the number of turns, N meets the requirements of the relevant standard, the test piece shall beconsidered as having passed the test, irrespective of the position of failure. f the number of turns, N. reacheddoes not meet the requirements of the relevant standard and the failure is within 2 d or 2 D distance from thegrips, the test shall be considered invalid and shall be repeated.7.5 Where the fracture in the torsion test is required to be characterized, it should be done on the basis ofAnnex C.NOTE For wires of smaller diameter or characteristic dimension it may not be possible to make a distinction betweensome of the classes in Annex C (e.g. 2b versus 35)Table 3-Rate of testingDiameter, d, or characteristicdimension, DMaximum number of turns per secondAluminium and aluminiumaloysSteelCopper and copper alloysmmd (D)

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