B10 life meaning

[Sa-Ro]

Hi

What is mean by B10 life.

For example, B10 life is 1000 hours calculated from physical validation of part.

Scenario A:

Which means 10% of population may fail BEFORE 1000 hours.

In a population of 100 parts, 10 parts may fail BEFORE 1000 hours.

10 parts failure may be at. 100, 200, 300, 400, 500, 550, 600, 800, 900, 950 hours. (leaving the calculation aside, for my understanding)


Scenario B:

Which means 10% of population may fail AFTER 1000 hours.

In a population of 100 parts, 10 parts may fail AFTER 1000 hours.

10 parts failure may be at. 1100, 1200, 1300, 1400, 1500, 1550, 1600, 1800, 1900, 1950 hours. (leaving the calculation aside, for my understanding)

Kindly clarify.

Thank you.

 

[RedSnake]

Scenario A:

Which means 10% of population may fail BEFORE 1000 hours.

In a population of 100 parts, 10 parts may fail BEFORE 1000 hours.

10 parts failure may be at. 100, 200, 300, 400, 500, 550, 600, 800, 900, 950 hours. (leaving the calculation aside, for my understanding)

B10 is a value used to estimate the life of the product.
It provides a statistical life indication that describes at least 90% of the products you have purchased will meet or exceed life expectancy when used in accordance with product specifications.
Meanwhile, a maximum of 10% may fail.

 

[Sa-Ro]

B10 is a value used to estimate the life of the product.
It provides a statistical life indication that describes at least 90% of the products you have purchased will meet or exceed life expectancy when used in accordance with product specifications.
Meanwhile, a maximum of 10% may fail.

Thank you Redsnake.

Can you provide some reference / standard / website as a evidence. So that I can refer.

 

[Sa-Ro]

Meanwhile, a maximum of 10% may fail.

Shall consider, Scenario A is true.

 

[RedSnake]

I am sorry but we are celebrating New Years Eve and New Year so I have been in the kitchen making New Years dinner.

Maybe I should have asked if you wanted to know just for your understanding or you where going to determine the B10 for some product?

Depending on which product we are talking about there is several ISO standards that describe how to determine B10 for the particular product it refers to.
Not sure there is one standard that just describes B10, its seems to be an old well established method to describe lifetime of a product.

 

[Sa-Ro]

I am sorry but we are celebrating New Years Eve and New Year so I have been in the kitchen making New Years dinner.

Maybe I should have asked if you wanted to know just for your understanding or you where going to determine the B10 for some product?

Depending on which product we are talking about there is several ISO standards that describe how to determine B10 for the particular product it refers to.
Not sure there is one standard that just describes B10, its seems to be an old well established method to describe lifetime of a product.

Hi

Happy new year!

It is for my understanding only.

My colleague statement is scenario B.

My point is scenario A.

We are dealing with pneumatic products where life of a product specified in terms of distance / cycles.

We are already practicing reliability and determining B10 life for our products. Hence no doubt in how to determine B10 value.

Only understanding of B10 value is problem.

Thank you.

 

[RedSnake]

Happy new year to you too..

Well then you have ISO 19973 -1:2015, IDT
Pneumatic fluid power — Assessment
of component reliability by testing —
Part 1:
General procedures

https://cdn.standards.iteh.ai/samples/62570/0e6a63a95c964118b0722e80c53f2ef6/ISO-19973-1-2015.pdf

 

[Sa-Ro]

Happy new year to you too..

Well then you have ISO 19973 -1:2015, IDT
Pneumatic fluid power — Assessment
of component reliability by testing —
Part 1:
General procedures

https://cdn.standards.iteh.ai/samples/62570/0e6a63a95c964118b0722e80c53f2ef6/ISO-19973-1-2015.pdf

View attachment 2944

We are using the same standard for reference.

Only confusion is "B10 - EXPECTED TIME AT WHICH 10% OF THE POPULATION IS PREDICTED TO FAIL" means scenario A (or) B.

Thank you.

 

[dgeesaman]

The life of rolling bearing components varies widely from unit to unit.

ABMA 9 and 11 and ISO 281 are the governing standards. If you google that you should find ample information. These are mathematical estimates based on some physical tests conducted many years ago. If a vendor claims a B10 value, they performed calculations. They generally did not repeat the physical tests.

B10 is the amount of life estimated at which 10% of the bearings have failed via surface fatigue with reasonable lubrication and temperatures. B10 is the life measured in revolutions and B10h is the same life converted to hours of operation. If your machine has multiple bearings with the same B10 life, and any one bearing failure is considered a machine failure, the B10 of the machine is different than any one bearing.

B10a / L10a allows for improved estimates considering lubrication, temperature, and reliability (for example L1 or L50). For what that's worth (not a whole lot in my opinion), but it's always helpful to know if the basic B10 calc is conservative or not for your actual application.

ISO 281 also has an 'infinite life' load. I have no experience with it, nor have I seen customers recognize it as a valid design specification. I caution you to not be overly reliant on that design method.

 

[Sa-Ro]

The life of rolling bearing components varies widely from unit to unit.

ABMA 9 and 11 and ISO 281 are the governing standards. If you google that you should find ample information. These are mathematical estimates based on some physical tests conducted many years ago. If a vendor claims a B10 value, they performed calculations. They generally did not repeat the physical tests.

B10 is the amount of life estimated at which 10% of the bearings have failed via surface fatigue with reasonable lubrication and temperatures. B10 is the life measured in revolutions and B10h is the same life converted to hours of operation. If your machine has multiple bearings with the same B10 life, and any one bearing failure is considered a machine failure, the B10 of the machine is different than any one bearing.

B10a / L10a allows for improved estimates considering lubrication, temperature, and reliability (for example L1 or L50). For what that's worth (not a whole lot in my opinion), but it's always helpful to know if the basic B10 calc is conservative or not for your actual application.

ISO 281 also has an 'infinite life' load. I have no experience with it, nor have I seen customers recognize it as a valid design specification. I caution you to not be overly reliant on that design method.

Thank you.