Calculate Fatigue Life of Custom Bolt

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SUMMARY

The discussion focuses on calculating the fatigue life of a custom bolt, specifically one with an axial load of 2000 pounds and a shank diameter of 0.1250 inches. Key factors include understanding the loading conditions, the material properties, and stress concentrations. Participants recommend consulting S-n diagrams for the material used and adhering to ASTM standards for fatigue testing. The calculation process will vary significantly based on the material, heat treatment, and custom design elements of the bolt.

PREREQUISITES
  • Understanding of fatigue life calculations
  • Familiarity with S-n diagrams for materials
  • Knowledge of ASTM standards for fatigue testing
  • Basic principles of stress concentration in mechanical components
NEXT STEPS
  • Research S-n diagrams for the specific material used in the custom bolt
  • Study ASTM standards relevant to fatigue testing
  • Learn about stress concentration factors and their impact on fatigue life
  • Explore hand calculation methods for fatigue life estimation
USEFUL FOR

Mechanical engineers, materials scientists, and design engineers involved in the manufacturing and testing of custom fasteners and components.

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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