GB/T 4909.8-2009Test methods for bare wires - Part 8: Hardness test - Brinell hardness test (English PDF)

1 Scope

This section GB/T 4909 specifies the test principle bare wires Brinell hardness test method, the test device, specimen preparation, the measuring step,

Evaluation of test results and the like.

This section applies to the determination of the hardness of copper, aluminum and its alloy conductors.

Brinell hardness test the upper limit of the range specified in this part of 150HBW.

This section should be used in conjunction with the GB/T 4909.1-2009.

2 Normative references

The following documents contain provisions which, through reference to GB/T 4909 to the present, constitute provisions of this section. For dated reference documents

Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section

Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 231.1-2002 Brinell hardness test - Part 1. Test method (eqv ISO 6506-1.1999)

GB/T 231.2-2002 Brinell hardness test - Part 2. Verification and calibration of hardness (eqv ISO 6506-2.1999)

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

3 Test principle

After the test methods specified in this part is to use a carbide ball under test force pressed into the surface of the specimen until a predetermined time removing the test

Force test, measuring the diameter of the specimen surface indentation, as shown in Figure 1. Conductor Brinell hardness by the formula (1).

Brinell hardness = 0.102 × 2F (1)

Where.

F --- test force in Newtons (N);

D --- press ball diameter in millimeters (mm);

1 a schematic diagram Brinell hardness test […]