A ball bearing operates at 3000RPM, and has a life of 50,000 hours, 6500hours and 1000hours when subjected to constant amplitude loads of 1kN, 2kN and 4kN. During each hour of operation, the load is 4kN for 5min, 2kN for 15min and 1kN for 40min. Given this information, determine the total damage caused by this loading sequence on the ball bearing. Also, determine the life of the bearings in terms of hours. What percentage of the damage is caused by each of the loading individually?

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.