GB/T 4909.5-2009Test methods for bare wires - Part 5: Bend test - Reverse bend test (English PDF)

Foreword

GB/T 4909 "Test methods for bare wires" is divided into twelve parts.

- Part 1: General;

- Part 2: Measurement of dimensions;

- Part 3: Tensile test;

- Part 4: Torsion test;

- Part 5: Bend test - Reverse bend test;

- Part 6: Bend test - Single bend test;

- Part 7: Part 7: Mandrel winding test;

- Part 8: Hardness test - Brinell hardness test;

- Part 9: Test for continuity of coating - Sodium polysulfide solution method;

- Part 10: Test for continuity of coating - Ammonium persulfate solution method;

- Part 11: Test for adherence of coating;

- Part 12: Solderability test of coating - Solder globule method.

This part is part 5 of GB/T 4909.

This part replaces GB/T 4909.5-1985 "Test methods for bare wires - Part 5: Bend test - Reverse bend test".

As compared with GB/T 4909.5-1985, the main changes in this part are as follows.

- According to the requirements of GB/T 1.1-2000 "Directives for standardization - Part 1: Rules for the structure and drafting of standards", MODIFY the compilation format, MODIFY some texts;

- EXPAND the scope of application of the standard (clause 1 of the 1985 version; clause 1 of this version);

- ADD the clause "Normative references" (not available in the 1985 version; clause 2 in this version);

- ADD the requirements for the size and position of curved cylinders and clamps (clause 2.1 of the 1985 version; clause 3.2 of this version);

- ADD the requirements for the size and position of the curved arms and levers (clause 2.1 of the 1985 version; clause 3.3 of this version);

- MODIFY the parameters of the bend test (clause 4.1 of the 1985 version; clause 5.1 of this version);

- SPECIFY the method of clamping the specially-shaped section specimens (not available in the 1985 version; clause 5.2 of this version);

- ADD the expression of the test results (clause 5 of the 1985 version; clause 6.1 of this version);

- ADD the evaluation of test results (clause 5 of the 1985 version; clause 6.2 of this version).

1 Scope

This part of GB/T 4909 specifies the test equipment, test piece preparation, measurement procedure, test results and evaluation of the reverse bend test in the bend test of bare wires.

This part is applicable to the determination of reverse bend performance of the round-section conductors such as copper, aluminum and its alloys, bimetallic wires and so on which have a nominal diameter d of 0.3 mm ~ 10.0 mm as well as the specially-shaped section conductors with characteristic size alpha <= 20.0 mm (such as contact wires).

This part uses a bending test in which one end of the test piece is fixed and the free end is 90° bent in the forward and reverse directions along a cylindrical surface of a predetermined radius, it is bent to a specified number of times or until the test piece is broken. This part shall be used in conjunction with GB/T 4909.1-2009.

2 Normative references

The provisions in following documents become the provisions of this part through reference in this part of GB/T 4909. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this part; however, parties who reach an agreement based on this part are encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

GB/T 4909.1-2009 Test methods for bare wires - Part 1: General

3 Test equipment

4 Preparation of test pieces

5 Test steps

6 Test results and assessment