Calculate Fatigue Life of Custom Bolt

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Discussion Overview

The discussion revolves around calculating the fatigue life of a custom bolt, focusing on the necessary parameters and considerations for such calculations. Participants explore various factors that influence fatigue life, including loading conditions, material properties, and stress concentrations.

Discussion Character

  • Technical explanation
  • Exploratory
  • Homework-related

Main Points Raised

  • Ana seeks guidance on calculating the fatigue life of a custom bolt and provides initial details about its design.
  • CS questions the type of loading applied to the bolt, indicating its importance in the calculation process.
  • One participant emphasizes the need to know the loading conditions, material properties, and stress concentrations, suggesting that an S-n diagram could be useful if a well-known material is used.
  • Another participant mentions that there are standards for conducting fatigue tests and advises looking into ASTM specifications, noting that the outcome will depend significantly on material properties and any custom design aspects.
  • Ana specifies that the axial load on the bolt is around 2000 pounds and provides the shank diameter as .1250".

Areas of Agreement / Disagreement

Participants generally agree on the importance of various factors such as loading conditions and material properties in calculating fatigue life. However, the discussion remains unresolved regarding specific methodologies or calculations to be used.

Contextual Notes

Participants have not yet established the exact loading conditions or material specifications, which are critical for accurate fatigue life calculations. There may be additional assumptions or details required for a complete analysis.

araanandv2
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Hi All,

We have manufactured a custom bolt (similar to standard bolt).
Now we need to calculate the fatigue life of the bolt.
Could you please guide me in calculating the fatigue life?

Thanks,

Ana
 
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araanandv2 said:
Hi All,

We have manufactured a custom bolt (similar to standard bolt).
Now we need to calculate the fatigue life of the bolt.
Could you please guide me in calculating the fatigue life?

Thanks,

Ana

What type of loading?

CS
 
Basically, you'll need to know what the loading conditions are, what material the bolt is made out of, and the stress concentrations in the bolt. As long as you used a well-known material, you should be able to find an S-n diagram for it; but it will be up to you to figure out where the bolt will fail and under what conditions.
 
There are standards for doing such tests. I would suggest a look through ASTM's specs.

It will also drastically depend on material, heat treat and what you have made custom in the design.
 
Thank you.

I need to do Hand calculation.
The axial load on the bolt is around 2000 pounds.
The shank dia of the bolt is .1250".

Thanks,

Ana
 

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