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Edition:Final Report May 1995 to June 1996
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Abstract:This study aimed at developing a specification to ensure that cutting edges meet the required durability and a test procedure to evaluate the cutting edges. A thorough review was carried out of all relevant SDDOT specifications for cutting edges and available literature pertaining to material test methods which might be used to measure cutting edge durability. A number of important materials properties which influence the durability of cutting edges were identified and discussed. Recommendations of specification changes of grain size and hardness were made. The scratch test was identified as a simple and convenient testing method for the evaluation of cutting edges. A major outcome of this study is the development of the procedures and devices for the scratch test of cutting edges. A testing apparatus peculiar to the scratch test of cutting edges was designed and manufactured. Using this test apparatus, laboratory tests were conducted for three groups of existing cutting edges (referred to as Ken, Pacal, and Valks) provided by SDDOT. The highest scratch hardness was found for Kennametal blades, and the lowest scratch hardness for Pacal blades. This finding is consistent with the results of field tests performed by SDDOT under SD89-04 for the existing cutting edges where Kennametal blades were found to be more wear resistant than Pacal blades. Within the load range between 9.3N and 22N, the values of scratch hardness appeared to be fairly constant. This is an indication that the scratch hardness may be a promising parameter for evaluating wear resistance of cutting edges. It is recommended that the scratch test be used on a trial basis as a complementary means for cutting edge evaluation.
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