All materials creep. Even if it’s not significant for a given application. Even glass creeps. But whatever.bbhack wrote: ↑Tue Apr 07, 2020 8:33 pmhttps://www.nationalboard.org/Index.aspx?pageID=181Texas_Blaze wrote: ↑Tue Apr 07, 2020 8:01 pm All materials experience stress relaxation. This is the decay of stress with time. When there stress developed in the material due to deflection decays, the strain becomes permanent. When strain is permanent, then force of spring is deceased. We know this for example, is an issue in metal spring energized seals (what is that you ask?). These are used in downhole tools and have a service life of 10-20yrs. The rate of stress decay will depend on time and imposed load. So if designed properly, the spring can last the expected lifetime of the product.
Look at Table 1 at the bottom. Below these temperature these materials do not creep.
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Return to “Do Springs Take a Set if the Striker is pre-cocked/the hammer cocked?”
- Tue Apr 07, 2020 8:57 pm
- Forum: General Gun, Shooting & Equipment Discussion
- Topic: Do Springs Take a Set if the Striker is pre-cocked/the hammer cocked?
- Replies: 19
- Views: 11837
Re: Do Springs Take a Set if the Striker is pre-cocked/the hammer cocked?
- Tue Apr 07, 2020 8:01 pm
- Forum: General Gun, Shooting & Equipment Discussion
- Topic: Do Springs Take a Set if the Striker is pre-cocked/the hammer cocked?
- Replies: 19
- Views: 11837
Re: Do Springs Take a Set if the Striker is pre-cocked/the hammer cocked?
All materials experience stress relaxation. This is the decay of stress with time. When there stress developed in the material due to deflection decays, the strain becomes permanent. When strain is permanent, then force of spring is deceased. We know this for example, is an issue in metal spring energized seals (what is that you ask?). These are used in downhole tools and have a service life of 10-20yrs. The rate of stress decay will depend on time and imposed load. So if designed properly, the spring can last the expected lifetime of the product.