AUH-II Portable Ultrasonic Hardness Tester

A large LED display and simple three-button control make this device easy to use. The first is dynamic impact, which is based on the Leeb principle of hardness developed by Dietmar Leeb in the 1970s. Initial thrust and rebound speed are measured in a noncontact mode and are calculated as a Leeb hardness value. AJR AUH-II model machine allows for the testing of highly sensitive on finished parts that previously could not be tested in an operational setting. The non-destructive feature of AJR AUH-II allow the operator to accurately test parts without causing physical or structural damage that would normally lead to disposal or refinish of operators part. This translates into less scrap parts/ lower mfg costs due to necessary inspections.

“Ultrasonic Contact Impedance”is based on a 136 degree diamond at the end of a vibrating rod being depressed into the test surface at a fixed load. The difference in Ultrasonic vibration frequency is then calculated into a hardness value. The UCI portable hardness tester procedure is slower than the Dynamic Impact style, however the “UCI” method of hardness testing is portable, easy and accurate. It also has its own advantages when utilized for certain testing applications. UCI portable hardness testers are not restricted to large mass items like dynamic type testers. These portable hardness testers can test metals as thin as 2mm and at a hardness value as low as 20HRC .

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Indentation Depth (μm)

It provides rapid, multi-element determinations with sufficient accuracy to assure product quality. Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge. Calibrate on a small standard of testing material standards, the machine can measure same material. UCI Hardness Tester has the sealed housing with rubber protective strips, it is ideal for use in workshop, and field conditions with high humidity, dust, etc. The hardness tester has frost-resistant display, which allows user to use the device at any season and in any climatic zone of the Earth. Thus, we can infer the stiffness change by measuring the resonance frequency shift or the signal amplitude change.

To validate the effectiveness of the sensor model, finite element analyses and experiments are conducted. The contact-impedance meter is a surface hardness tester based upon the measurement of the change in the resonance frequency of a mechanical resonator brought into contact with a surface. In this article, which is the first of a series, some of the theoretical aspects of the meter are discussed and the contact-impedance method is compared and contrasted with other hardness testing methods. Our Ultrasonic hardness testers display test results in Rockwell C, Brinell, Vickers.

This set up is used to modify selected input parameters according to a Design of Experiments in order to investigate their impact on tool wear and drawing force. The results obtained can be summarised into two simple equations, which depend only on the most dominant parameters. This method allows a quantitative optimisation of the press hardening process, as illustrated by a practical example.

Phase II Coating thickness gauge with 2 external probes

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Metallographic Sample Cutting Machine

In ASTM A1038 testing, hardness is reported in SI units and is considered as standard. Built-in camera allows user to picture of testing object and mark tested area with corresponding hardness value. It is found that interaction of Glu, Lys, Gly and Ser amino acids with BNNTs in both phases is energetically favorable.

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