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GOST R 50708-94

GOST R ISO 22034-1-2013 GOST R ISO 22034-2-2013 GOST P 53772-2010 GOST 5468-88 GOST 1579-93 GOST 10447-93 GOST 3187-76 GOST 9870-61 GOST 4034-63 GOST 4032-63 GOST 4028-63 GOST 792-67 GOST 16135-70 GOST 3920-70 GOST 9850-72 GOST 7675-73 GOST 18901-73 GOST 3062-80 GOST 3093-80 GOST 1526-81 GOST 2771-81 GOST 3875-83 GOST 3071-88 GOST R 50575-93 GOST P 50708-94 GOST 4033-63 GOST 13840-68 GOST 15598-70 GOST 3090-73 GOST 3110-74 GOST 3339-74 GOST 3120-75 GOST 283-75 GOST 10505-76 GOST 14963-78 GOST 14081-78 GOST 7372-79 GOST 5663-79 GOST 1545-80 GOST 3092-80 GOST 9161-85 GOST 29121-91 GOST 18143-72 GOST 1668-73 GOST 7480-73 GOST 7676-73 GOST 3193-2015 GOST 2715-75 GOST 10506-76 GOST 7669-80 GOST 2333-80 GOST 7668-80 GOST 3069-80 GOST 7667-80 GOST 2688-80 GOST 3089-80 GOST 3081-80 GOST 6727-80 GOST 3083-80 GOST 3091-80 GOST 7665-80 GOST 3077-80 GOST 2387-80 GOST 3064-80 GOST 3063-80 GOST 7348-81 GOST 5437-85 GOST 14118-85 GOST 23279-2012 GOST 14311-85 GOST 9074-85 GOST 3068-88 GOST 13603-89 GOST P 50566-93 GOST 4030-63 GOST 4035-63 GOST 4029-63 GOST 15892-70 GOST 11850-72 GOST 18899-73 GOST 6750-75 GOST 3088-80 GOST 10446-80 GOST 14954-80 GOST 7681-80 GOST 3079-80 GOST 3066-80 GOST 3097-80 GOST 3085-80 GOST 8478-81 GOST 4727-83 GOST 18834-83 GOST 26366-84 GOST 9124-85 GOST 3067-88 GOST 3070-88 GOST 3306-88 GOST 8803-89 GOST 17305-91 GOST P 50567-93 GOST 9389-75 GOST 2172-80 GOST 1071-81 GOST 3826-82 GOST 16853-88 GOST 12766.1-90 GOST 3241-91 GOST 16828-81 GOST 285-69 GOST 6613-86 GOST 28334-89 GOST 16827-81 GOST 5336-80 GOST 3282-74

GOST R 50708−94 (ISO 9649−90) Wire. Test method for alternating torsion


GOST R 50708−94
(ISO 9649−90)
Group В79

STATE STANDARD OF THE RUSSIAN FEDERATION
WIRE
Test method for alternating torsion
Wire. Reverse torsion test

ISS 77.040.10
77.140.65
OKP 12 0100

Date of introduction 1996−01−01

Preface

1 DEVELOPED AND SUBMITTED by the Technical Committee TC 146 «Hardware"

2 ADOPTED AND put INTO EFFECT by the Resolution of Gosstandart of Russia from November 8, 1994 N 266

3 this standard contains the full authentic text of international standard ISO 9649−90 «metal Materials. Wire. Test alternating the twist» with additional requirements that reflect the needs of the national economy

4 INTRODUCED FOR THE FIRST TIME

5 REISSUE

1 Scope


This standard specifies a method for determining the ability of metallic wire of diameter from 0.3 to 10 mm subjected to plastic deformation under alternating torsion. This test is conducted to detect surface and internal defects in the wire.

Additional requirements that reflect the needs of the economy, in italics.

2 Normative references


GOST 1545−80 Wire. Test method for torsion

3 Symbols and definitions


Wire designations are shown in figure 1 and in table 1.

ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

Figure 1



Table 1

Marking
Definition Unit

ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

The diameter of the round wire
mm

ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

Length of tested part of the specimen (distance between clamps)
mm

ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

The number of twists in one direction
-

4 the essence of the method


A sample of wire is twisted a specific number of times 360° around its axis in one direction and the same number of times 360° in the opposite direction.

5 testing Equipment

5.1 the Grips should be solid to ensure the rigidity and resistance to abrasive wear and must be installed on the machine so that during the test they were on one axis and subjected to sample the effects of a bending force.

5.2 the Machine shall be so designed as not to prevent change of the distance between the grips during the test.

5.3 One of the grippers of the machine should rotate around the axis, the other must not have angular deviations, with the exception of cases when such deviation is necessary to measure torque.

5.4 the distance between the hooks should be adjusted depending on the length of the specimen.

5.5 Testing machine should be so designed as to subject the sample it was possible to make the necessary tensile stress in accordance with 7.2.

5.6 Machine must provide the ability to change the direction of torsion.

6 the Procedure for preparation of samples for testing

6.1 cut the wire that is used as a sample, should be straight.

6.2 If necessary, edit the sample manually, or, if possible, with a hammer of wood, plastic or copper on the flat surface of the same material.

6.3 When editing the surface of the wire must not be damaged and the test sample shall be subjected to torsion.

6.4 Wire with sharp local curvature should not be used as a test sample.

6.5 If in the relevant standard there is no special clause, the distance between the grips (nominal) shall be those specified in table 2.


Table 2

In millimeters

Nominal diameter of wire ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

The distance between the grips (nominal)

0,3ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание1

200ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

1ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание5

100ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание*

5ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание

50ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание**

* 50ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручиваниеmay apply for special approval.

** 30ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручиваниеmay apply for special approval.

Can be set a fixed distance between the grippers that is specified in the relevant standard and recorded in the test report.

7 test Procedure

7.1 Tests shall be carried out at a ambient temperature from 10 to 35 °C.

Arbitration trials conducted at a temperature of (25±5) °C.

7.2 the Sample in the grips so that its longitudinal axis coincides with the axis of the grips and to remain straight throughout the test. If there is a special dogovorennosty in the relevant standard, this may be achieved by application to the sample of wire constant tensile stresses sufficient for straightening of the sample, the value of which shall not exceed 2% of the nominal value of the temporary resistance.

7.3 After securing the test sample in the car one of the grips should rotate at a speed not exceeding one revolution per second for wire diameter less than 5 mm and 0.5 revolution per second for diameter of wire 5 mm or more. The number of revolutions in one and opposite directions must be established in the relevant standard on the wire.

One twist of the take a turn of 360°.

After the test, the surface of the sample between the grips and check visually if there is a special clause in the relevant standard.

7.4 the Absence of visible defects is reasonable to assume that the sample passed the test.

7.5 If the failure of the specimen occurred in the seizure of the car or near the grips (at least 2ГОСТ Р 50708-94 (ИСО 9649-90) Проволока. Метод испытания на знакопеременное скручивание) and the sample did not maintain the required number of twists, the result of this test is not considered. The test should be repeated on another sample selected from the same coil (coil), a sample of which collapsed.

8 test report

8.1 the test report shall contain:

a) the number of this standard;

b) characteristics of the test sample;

in) diameter sample;

g) the method changes the sample;

d) test conditions (for example, the length of tested part of the specimen, tensile stress);

e) test results.