Bearing life is defined as the number of revolutions or the number of operating hours at a given speed that the bearing is capable of enduring before the first sign of metal fatigue spalling occurs on a rolling element or the raceway of the inner or outer ring. A measurement of the time by which ten percent of a population of a product will have failed.
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The b10 life metric became popular among ball and roller bearing makers due to the industrys strict requirement that no more than 10 of bearings in a given batch fail by a specific time due to fatigue failure.
B10 bearing life. The pump b10 bearing life also known as l10 bearing life equation calculates a pumps b10 bearing life given its rated life lrated rated speed srated new speed snew rated pressure prated and new pressure pnew. By mike mortensen director of engineering rbi usa bearing life refers to the amount of time any bearing will perform in a specified operation before failure. Bearing life is commonly defined in terms of l 10 life which is sometimes referred to as b 10.
I have estimated a b10 life for a bearing based on my operating conditions. In the simplest terms l10 life is calculating with 90 reliability how many hours a bearing will last under a given load and speed. 4000 mpa 580000 psi for all roller bearings.
Definition of b10 life. Bearing rating life calculation rating life is the bearing life calculated for 90 reliability. The term originates from the manufacture of anti friction bearings and is used to express the minimum.
How do we calculate bearing life. Assuming that bearings tend to fail according to a known distribution there ought to be a simple way to convert b10 to failure rate in failureshour. Service life is the life of a bearing under actual operating.
What im trying to do is determine how many failureshour i can expect based on that b10 life. Bearings are often specified to give an l10 life outside the usa it may be referred to as b10 life this is the life at which ten percent of the bearings in that application can be expected to have. There is a 10 probability that at the applied load and speed 10 of a population of identical bearings would suffer a fatigue failure typically pitting on the raceway of the bearing.
I just cant find it. This is the amount of time that a group of apparently identical bearings will complete or exceed before the formation of a fatigue spall. Bearing life varies because microscopic structure and contamination vary greatly even where macroscopically they seem identical.
The median or average life sometimes called mean time between failure mtbf is about five times the calculated basic rating life. Dictionary term of the day articles subjects businessdictionary business dictionary.
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