Shear strength of mild steel vs 303 stainless
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Posted by: aalk ®

07/05/2006, 01:21:58
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I am trying to determine if the shear (fatigue) strength of mild steel and 303 stainless are about the same or vastly different. The problem presents as an 1/8" thick strap, 8" long overall, 1" wide at one end where there is a 9/16" hole and 1 1/8" wide at the other end where there is a 3/4" hole. Both holes are 1" inboard (to center) of the end of the strap and centered on the width. The question is would mild steel or 303 stainless be the best choice for this item. We are looking for the strongest material in tension. It will never be compressed or bent.

Thanks for any information you can lend.






Modified by aalk at Wed, Jul 05, 2006, 01:24:02


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Re: Shear strength of mild steel vs 303 stainless
Re: Shear strength of mild steel vs 303 stainless -- aalk Post Reply Top of thread Forum
Posted by: Kelly_Bramble ®

07/05/2006, 09:09:48
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You need to obtain the material specifications for both and review and compare.

Do you know where to get these?








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Re: Re: Shear strength of mild steel vs 303 stainless
Re: Re: Shear strength of mild steel vs 303 stainless -- Kelly_Bramble Post Reply Top of thread Forum
Posted by: aalk ®

07/05/2006, 09:21:43
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I did see some specs, however, since I have never used this information before, it is foreign to me. As a result, trying to navigate through Strength of Materials charts to find the correct comparison is extremely difficult for me so I thought I would ask for some help.







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Re: Re: Re: Shear strength of mild steel vs 303 stainless
Re: Re: Re: Shear strength of mild steel vs 303 stainless -- aalk Post Reply Top of thread Forum
Posted by: Kelly_Bramble ®

07/05/2006, 09:43:59
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What you need is a S-N Curve chart for both of these materials. It is also called a "Wohler Curve"
S-N stands for Cyclic Stress (S) vs Cycles to failure (N).

When comparing these charts look at your expected peak stress at a known number of cycles and compare. Once you see the charts it will be clear how the materials compare while under fatigue loading. These charts should be available for specific loading (tension, compression, bending...).

If you are designing a product or structure that will need to function properly to protect life and/or property, make sure you get a engineering professional review before your project goes into service. You want to be sure..








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