Regardless of the Rockwell scale or indenter being used, the overall Rockwell test procedure is the same. The indenter is brought into contact with the material to be tested, and a preliminary force is applied to the indenter. The preliminary force is usually held constant for a set period , after which the depth of indentation is measured. After ultrasonic contact impedance hardness testing is made, an additional amount of force is applied at a set rate to increase the applied force to the total force level . The total force is held constant for a set time, after which the additional force is re-moved, returning to the preliminary force level. After holding the preliminary force constant for a set time, the depth of indentation is measured a second time, followed by the removal of the indenter from the test material.
Ultrasonic Contact Impedance probe
This is calculated as a Leeb hardness value and then automatically converted to Rockwell C, B, Brinell, Vickers and Shore Values. It has effectually brought easy, fast and accurate results to portable hardness testing. “Dynamic Impact”is based on the Leeb principle of portable hardness,developed by Dietmar Leeb in the 1970’s. Shore portable hardness testers are used for testing materials such as rubber, soft plastics and leath-er. Versions are also available for the testing of hard plastics such as bowling balls and hard hats. Electronic durometers for measuring Shore A and Shore D values are designed to fit comfortably and firmly in a user’s hand.
However, the UCI method has the advantages of being nondestructive and able to test thin and small workpieces. They can also quickly convert that hardness value into HB, HV, HK and many other scales. Desirable hardness tester features include the ability to obtain ultraprecise results, a wide measuring range and scale/selectable test-force capabilities. In addition, automatic main test-force loading/unloading, a high-resolution digital display and USB data storage are all advantageous. Ultrasonic Hardness Tester UCI – 3000D is a combined portable Hardness tester integrated with the ultrasonic Hardness testing method and dynamic Leeb hardness testing resolution in one instrument. UCI – 3000D is an updated product based on Ultrasonic hardness tester UCI-3000, it includes all the functions of UCI-3000, and so it supports all of static Ultrasonic measuring probes and Leeb dynamic impact devices together.
ultrasonic hardness testerHRZ-6
They are then automatically converted to Rockwell C, B, Brinell, Vickers and Shore values. The portable benefit also means the tester can be brought to the workpiece, which is especially useful when testing large and/or cumbersome parts. This method has resulted in efficient, fast and accurate portable hardness testing results.
Leeb Hardness Tester NOVOTEST T-D2 uses dynamic method of hardness testing – Leeb method, standardized according to ASTM A596. SU-300H Manual Ultrasonic Hardness Tester is a classical portable durometer made by Sinowon group. It applies method of ultrasonic contact independence to make hardness testing at the spot or in the laboratory.
The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding. The specimen used for ASTM A1038 hardness test, generally consists of a probe containing a rod with a defined indenter. TheUCI-3000comes equipped with mass storage capabilities, simple calibration, a large LCD display, and quick measurement techniques that can be carried out in less than 2 seconds. Large LCD Display – Direct display measurement result, time count, maximum, minimal, average and deviation.
When leaving a mark or indentation is not an option, nondestructive ultrasonic technology can be used. Concrete rebound Schmidt hammer – is a device for concrete and other building materials strength testing. The most common in the world instrument for measuring the strength of concrete is the Schmidt Hammer. The device is called by the name of the engineer Ernst Schmidt, who invented the construction of the sclerometer.
