A hardness testers are gadgets used to determine a material’s degree of hardness. Through hardness testing, you can easily assess the firmness, malleability, and depreciation defiance of the material. Ideally, a hardness test is carried out by exerting pressure on the material you are testing, using an indenter. The indenter is a stuffed device that assumes a definite shape and specific measurements.
The material’s strength is established by quantifying the profundity of the indenter’s perforation. Alternatively, the firmness can be ascertained by gauging the expanse of the impact caused by the indenter. Upon completion of the hardness test, you can then evaluate the material’s appropriateness for the intended purpose. However, there are multiple ways of testing the hardness of a material, influenced by several factors.
Factors That Determine the Suitable Mode of Hardness Testing
The following factors go a long way in establishing the most fitting method of hardness testing:
- The dimensions of the material’s part being tested.
- The number of required samples for the test.
- The desired level of the outcome’s accuracy.
- The kind of material to be tested for hardness.
- A hard estimate of the material.
Having put into consideration the above factors before going ahead with the test, will help you to select the suitable method to use. Some of these methods are:
- Vickers test – Suitable for all kinds of solid materials.
- Knoop test – Appropriate for the firm and brittle items.
- Brinell test – Best for large samples, especially those whose structures are inhomogeneous.
- Rockwell test – Also suitable for large samples, mainly for metallic materials.
It is worth noting that some external elements such as temperature and humidity can affect hardness tests. To mitigate their influence on the test results, these factors should be regulated. It is also common to adjust parts of the hardness testing equipment such as the indenter, in the course of the test. Therefore, you should ensure recalibration before beginning any test, for enhanced accuracy of the results.