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Effects of Cyclical Load Conditions on Wear Rate and Wear Scar in a Modified ASTM G65 Abrasion Test Open Access


Other title
Type of item
Degree grantor
University of Alberta
Author or creator
Curley, Mark A
Supervisor and department
Li, Leijun (Materials Engineering)
Joseph, Tim (Mining Engineering)
Examining committee member and department
Li, Leijun (Materials Engineering)
Joseph, Tim (Mining Engineering)
Hall, Robert (Mining Engineering)
Department of Civil and Environmental Engineering
Mining Engineering
Date accepted
Graduation date
Master of Science
Degree level
Wear is an incredibly complicated phenomenon that can occur in many different forms, through a number of modes, facilitated by a variety of mechanisms. Surface mining operations are particularly afflicted by abrasive wear; principally during the excavation process. Shovel geometry has been analyzed and resolved to determine the intensity of abrasive forces acting at the dipper teeth; the predominant site of abrasive wear attack. Raw field data was scaled down to appropriate laboratory magnitudes in order to facilitate laboratory wear testing. Accurate prediction and classification of wear in a lab setting is crucial to industry, as it provides a quick and rather inexpensive means to better assess wear attack. A current standardized test often employed by industry is the ASTM G65 Dry Sand/Rubber Wheel Abrasion Test. This test utilizes a rounded quartz grain abrasive, a constant normal load and a predetermined lineal abrasion distance. In order to better reflect practical mining conditions, this standardized test was modified to allow for adjustable load conditions combined with an abrasive media representative of an oil sands mining operation. An apparatus was designed to incorporate a load varying instrument and electrical devices to record the power draw and ultimately calculate the energy used during the abrasion process. The application of a load varying instrument was successful in mimicking electric shovel digging patterns. Cyclical loading better predicted shovel tooth life in an oil sands operation than its constant load counterpart. Inspection of the wear scars suggests constant and repeated loading conditions generate wear with different levels of severity; cyclical conditions being more damaging.
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