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Principles and Applications of Portable Hardness Testing

The hardness of a material dictates whether it is likely to be deformed plastically, by indentation, scratching, or penetration to whatever extent possible or whether it will be left completely unchanged.

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Principles and Applications of Portable Hardness Testing

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  1. Principles and Applications of Portable Hardness Testing The hardness of a material dictates whether it is likely to be deformed plastically, by indentation, scratching, or penetration to whatever extent possible or whether it will be left completely unchanged. With portable hardness testing, the advantage is that the element to be tested can be tested for hardness at the insitu, unlike the conventional methods of hardness testing which require polished samples to be tested in a laboratory. Principles of hardness testing There are three primary methods used for conducting the in-situ hardness testing – Ultrasonic Contact Impedance method and Leeb Rebound Hardness testing. A.Ultrasonic Impedance method – A probe in this method has a metallic rod with a Vickers diamond at the tip of the rod. Using piezoelectric transducers, the metal rod is brought into an oscillatory state. Depending upon the material of the test piece, rod will be damped or not by the penetration of the diamond tip into the surface, therefore shifting the frequency of the rod. The hardness aspect of the material is determined by correlating the shift in frequency to other hardness scales. B.Leeb Rebound method – In this case, the hardness of the material is determined by the energy loss of the impact body. A moving body is made to impact the surface of the test object. On impact, the body loses a certain amount of energy. If the test piece is made of a soft material, more energy will be absorbed by the collision. Hard materials will not absorb as much energy. C.Portable Rockwell method – Unlike the previous methods this method does directly measure the indentation of a Rockwell indenter into the material. It differs from a bench top Hrdness tester in that a) it uses a much lower energy that is imparted by the user (ie about 50kN) and b) the depth of the indent is measured rather than the lateral dimensions. Visit:- https://www.industrial-ndt.com/ Email us :- admin@pcte.com.au , Address :- 949-951 Wellington Street, Perth, Australia,6005

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