Compression Spring Stress Cycles to Failure
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Posted by: markg ® 07/08/2004, 11:34:40 Author Profile Mail author Edit

I have a .016" compression spring that I am compressing to its solid height. At its solid height its shear stress is 150,000 psi or about 50% of its ultimate strength and 65% of its yield strength. Does anyone know how to calculate the number of cycles to failure (1,000, 10,000, 100,000)?

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Re: Compression Spring Stress Cycles to Failure
Re: Compression Spring Stress Cycles to Failure -- markg	Post Reply	Top of thread	Forum

Posted by: drober ® 08/04/2004, 18:11:09 Author Profile Mail author Edit

If you go to the following link at xxxxx (no links) you will find out how to determine if the spring will last "forever" or not.  I made these calculations on a spring and found the R value to be -.25 but had the spring manufacturer (Century Spring) tell me that the spring will last 10,000 to 100,000 cycles.  So, it is not below the Soderberg line but still has a long life.  A shear strength of 150 ksi sounds very high, very high strength steels can also be brittle.         Modified by Administrator at Wed, Aug 04, 2004, 20:42:12

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