Brinell Hardness Testing Machine Diagram

It is used when the surface of the metal is very rough to use another hardness test on it.

Brinell hardness testing machine diagram.

Unlike with rockwell testing brinell tests measure the diameter of the indentation made by the ball not the depth. Samples are mounted in thermosetting plastic and ground and polished by the methods described in section 4 4 3. A rockwell superficial hardness machine is used to conveniently provide. The brinell hardness test is not suitable for very hard materials or hardened surface layers because the ball does not penetrate sufficiently into the material.

Brinell hardness test bhn the brinell hardness test consists of indenting the test material with a 10mm diameter hardened steel or carbide ball subjected to a load of 3000 kg. However it also had the useful feature that the hardness value divided by two gave the approximate uts in ksi for steels. Brinell hardness testing is particularly suitable for thicker heterogeneous materials in the low to medium hardness range. An efficient vickers knoop and brinell automatic hardness tester offering micro macro and universal testing in one machine.

There are two methods to perform the brinell hardness test on the metal as. Relatively high loads are applied to parts via a tungsten carbide ball in this method. A 10mm ball with an applied load of 3 000 kgf is most common for brinell testing. Vickers hardness standard testing machine sht 41 brinell hardness standard testing machine sht 5 and shore hardness standard testing machine sht 6.

Thin sheets cannot be tested with the brinell hardness test. Relation diagram for specimen hardness and. Book brinell testing which calls for a 12 6 kilogram load but is useful and convenient because of the widespread availability of 15 kg loading devices. Proposed by swedish engineer johan august brinell in 1900 it was the first widely used and standardised hardness test in engineering and metallurgy the large size of indentation and possible damage to test piece limits its usefulness.

Test forces range from 500 to 3000 kgf. Duramin 150 an entry level rockwell automatic hardness tester for high accuracy and a short cycle time. Practical hardness testing made simple 9 3. Diagram of brinell hardness testing machine.

A chart is then used to convert the averaged diameter measurement to a brinell hardness number. For softer materials there are alternate scales using a 1500 kg or 500 kg load to avoid excessive indentation. The sht series are the testing machines that provide a superb range of hardness standard.