Rotating abrasion method

The test was conducted in accordance with ASTM C 944-90a Standard of Abrasion Resistance of Concrete by the Rotating-Cutter Method. This method measures the capacity of wear resistance of a concrete surface. The specimens were 5 in. (127 mm) long, 4 1/2 in. (114 mm) wide and 1 1/2 in. (38 mm) thick and were cut from the tops of the beams cast for the deicing scaling test. The rotating-cutter was applied to the interior cut surface and not to the tool-finished surface of the sample. 

Drilhng. Glass is dtiUed with carbide or bonded-diamond dtiUs under a suitable coolant such as water or kerosene. Other drilling processes include a metal tube rotating about its axis (core drilling), an ultrasonic tool in combination with an abrasive slurry, or an electron beam. Tolerances less than 0.1 mm are readily obtained with diamond-core drilling and, if required, holes smaller than 25 )J.m-dia can be made with the electron-beam method. 

There is usually more than one test method to determine a performance because each test has its own behavior and meaning. As an example there are different tests used to determine the abrasion resistance of materials. There is the popular Taber abrasion test. It determines the weight loss of a plastic or other material after it is subjected to abrasion for a prescribed number of the abrader disk rotations (usually 1000). The abrader consists of an idling abrasive speed controlled rotating wheel with the load applied to the wheel. The abrasive action on the circular specimen is subjected to a rotary motion. 

The Roche Friabilator is one of the most common methods used to test for resistance to abrasion [147], In this case, a minimum of 6 g (often 20 tablets) of dedusted and weighed tablets are placed in a 12 in. high drum, which is then rotated for 100 revolutions. A... 

ISO 3934 2002 Rubber, vulcanized and thermoplastic - Preformed gaskets used in buildings - Classification, specifications and test methods ISO 4649 2002 Rubber, vulcanized or thermoplastic - Determination of abrasion resistance using a rotating cylindrical drum device ISO 4664-1 2005 Rubber, vulcanized or thermoplastic - Determination of dynamic properties - Part 1 General guidance... 

The majority of experiments on ion-bombarded materials have been performed using the pin and disc method. Here a standard pin under a load rubs against a rotating disc of the test material. Other methods such as rotating rods or the analysis of the abrasion have been applied less to ion-bombarded samples. 

In BS903, Part A9, the ISO method is one of four standard tests, the others being the DuPont, the Akron, and the Taber or rotary platform double head type machine. Like the ISO method, the DuPont test is one of continuous abrasion against a replaceable abrasive paper, this time of silicon carbide rather than of aluminum oxide, but there is no built-in procedure to avoid abrasive smearing and progressive changes in abrasive power other than a rotation of test pieces to even out differences. The Akron method involves the wear... 

There is currently only one standard test method in ISO devoted to the measurement of abrasion resistance for plastics materials, this being the "Taber test standardized in ISO 9352 [101]. In this test a specimen is clamped onto a turntable that rotates at either 60 rev per min (where the electrical mains frequency is 50 Hz) or 72 rev per min (where the electrical mains frequency is 60 Hz) and weighted abrasive wheels press against the surface of the te.st piece. The center of rotation of the test piece is offset from the line of contact of the wheels, and so as the former is rotated this caiuses the wheels to rotate and to wear an annular track into the specimen surface. Figure 19 gives an illustration of the test piece... 

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