27.03.2023 - 23:01

Select an appropriate hardness test for each of the following materials, and justify your answer: a) Cubic Boron Nitride b) Lead c) Cold Drawn 0.5%C steel d) Diamond e) Caramel Candy f) Granite

Select an appropriate hardness test for each of the following materials, and justify your answer:

a) Cubic Boron Nitride

b) Lead

c) Cold Drawn 0.5%C steel

d) Diamond

e) Caramel Candy

f) Granite

Answers (1)
  • dj-sf
    April 1, 2023 в 20:11

    a) Cubic Boron Nitride is an extremely hard material and can be tested using the Vickers hardness test. This test involves pressing a diamond pyramid indenter into the surface of the material at a known load, and measuring the size of the resulting impression. The Vickers hardness test is suitable for testing extremely hard materials, such as cubic boron nitride, as it can apply a high enough load to generate a measurable impression.

    b) Lead is a relatively soft material and can be tested using the Brinell hardness test. This test involves pressing a hardened steel ball indenter into the surface of the material at a known load, and measuring the size of the resulting impression. The Brinell hardness test is suitable for testing relatively soft materials, such as lead, as it can apply a lower load than the Vickers hardness test, and the resulting impression is large enough to measure accurately.

    c) Cold Drawn 0.5%C steel is a medium hardness material and can be tested using the Rockwell hardness test. This test involves pressing a diamond cone or steel ball indenter into the surface of the material at a known load, and measuring the depth of the resulting impression. The Rockwell hardness test is suitable for testing a wide range of materials, including medium hardness materials like cold drawn 0.5%C steel, as it can apply a range of loads and can be used with different indenters.

    d) Diamond is an extremely hard material and cannot be tested using any of the standard hardness tests, as the indenters used in these tests are not hard enough to create a measurable impression on diamond. Instead, the hardness of diamond is typically measured using the Knoop or Berkovich microhardness tests, which use very small diamond pyramid indenters and measure the size of the resulting impressions under a microscope.

    e) Caramel Candy is a relatively soft material and can be tested using the Shore durometer test. This test involves using a device with a spring-loaded probe to measure the resistance of the material to indentation. The Shore durometer test is suitable for testing soft materials, such as caramel candy, as it can apply a very low load and the resulting indentation is small enough to measure accurately.

    f) Granite is a relatively hard material and can be tested using the Mohs hardness test. This test involves scratching the surface of the material with a series of standard minerals of known hardness, and observing which minerals scratch the surface and which do not. The Mohs hardness test is suitable for testing relatively hard materials, such as granite, as it can provide a qualitative measure of hardness based on scratch resistance.

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