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ISO 28080-2011 pdf free download
ISO 28080-2011 pdf free download.Hard metals — Abrasion tests for hardmetals
Métaux-durs — Méthodes d’essai d’abrasion des métaux-durs.
It is also effective, in some circumstances, to use a reference material in a sequence of tests to nomalize test results to take account of minor uncontrolled variations in test conditions or changes in the make-up of the abrasive, This procedure is described in 81.
In any case, a test should be carried out periodically on a reference material to ensure that the test system is operating correctly and gives repeatable results.
Either the wheel is made from a solid piece of the requisite material such as steel, or, when elastomeric materials are being used to provide a compliant surface, a rim of the necessary elastomer is normally moulded onto the rim of a steel wheel. Suitable steel wheels as specified In ASTM B61 1 (AISI 1020) and chloiobutyl rubber rimmed wheels with a Shore A Durometer hardness of A 58-62 as specified in ASTM G65 or in ASTM G105 should be used.
Moulded polyurethane or other artificial elastomer rims can also be used, but it should be noted that, even if the same ambient temperature hardness is achieved for the polyurethane as for the above-specified rubber, significant differences in results can occur in dry tests, possibly due to alteration of mechanical properties relative to those of the rubber due to heating by the abrasion process.
5.4.2 Wheel size
The wheel specified in ASTM G65 has a diameter of 228,6 mm and a face width of 12,7 mm and in ASTM B611 it has a maximum diameter of 169mm and width of 12.7 mm. There are other test systems of a similar type which have wheels of different size, but unless there are special reasons to choose otherwise, the specific test conditions in the ASTM standards should be used. For tests which use rubber elastomer rims, such as ASTM G65, the thickness of the rim should be 12,7 mm. Again, if there are no special reasons to choose otherwise, the ASTM G65 conditions should be used.
The wheel is subjected to damage during the testing, and should be checked periodically. If significant damage has occurred, the wheel should be replaced. The overall diameter of the wheel should also be checked and, when it is reduced in size by the recommended amount (12,7 mm for ASTM G65 and 4 mm for ASTM B61 1), the wheel should be replaced.
The flatness and squareness of the contact area on the wheel are most easily checked by examining a wear scar (see Figure 3). If this is even and regular, then the contact is flat and square.
6.1 Summary of apparatuses (test systems).ISO 28080-2011 pdf free download.
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