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TOPIC: Stress Life Fatigue.xls
#1633
JohnDoyle[Admin] (Admin)
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Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 493  
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Stress Life Fatigue.xls
 
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#1650
MajorMagee (User)
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Re:Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 2  
I ran across a paper from 1980 by Peter R. Weihsmann, "Fatigue Curves Without Testing" that uses four-point correlation to generate fatigue estimates from just Tensile, Yield, Elongation and Modulus data.

File Attachment:
File Name: Fatigue_Estimator.xls
File Size: 94208
 
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Last Edit: 2009/05/19 23:54 By MajorMagee.
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#1659
JohnDoyle[Admin] (Admin)
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Re:Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 493  
This looks like a very interesting calculation probably deserving its own place in the repository. Would you like to upload it to the repository MajorMagee? I am not familiar with Peter R. Weihsmann work and I have been studying the calculation to understand the method. I probably would benefit for a little more explanation. I am going to play around with it to see how it compares with the "Stress Life Fatigue.xls" calculation. Great contribution again. Thank you.
 
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#1660
MajorMagee (User)
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Re:Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 2  
I'm not sure it's really worthy of the repository...

Here's the paper I was referring to.
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File Name: Fatigue_CUrve_Estimates_1980004.pdf
File Size: 1123540
 
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#1662
JohnDoyle[Admin] (Admin)
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Re:Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 493  
I still need to get my head around it but it looks like a very useful method. I have some friends coming round for band practise so I'll have to get back to you later - it will make a worthy repository item I think. Thanks again. John.
 
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#1663
JohnDoyle[Admin] (Admin)
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Re:Stress Life Fatigue.xls 8 Years, 6 Months ago Karma: 493  
I have had some time to work through this now MajorMagee. It took me a little while to see what was going on but I used XLC to generate some equations to revealed this clever method for fatigue estimation (and its even cleverer encoding into spreadsheet form). I have added my revised worksheet which includes the XLC equations.

Now I understand the method better the only difficulty I am having is understanding the general shape of the stress vs. cycles produced. As shown in the image below The curve seems to kick down at 1E4 cycles whereas I am used to seeing steel fatigue curves with an endurance limit at 1E6 as shown in the lower plot which has been taken from Stress Life Fatigue.xls. I wondered if you had any comments on this?

File Attachment:
File Name: Fatigue_Estimator_with_XLC.xls
File Size: 108032
 
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Last Edit: 2009/05/22 16:09 By JohnDoyle[Admin].
 
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