Posted by: bilbat ® 07/06/2004, 10:00:53 Author Profile Mail author Edit

I have been working on a re-design of a drawn steel stamping. One of the design requirements is to reduce the weight as much as possible without compromising strength. I am planning on reducing the material thickness incorporating several strengthening ribs. The un-drawn yield strength of EDDS cold rolled steel is 15 – 25 KSI. I suspect the ribs will contribute to locally higher yield strength. Are there any “rules of thumb” in regards to work hardening and the yield strength? The FEA software does not seem to address the work hardening occurring during the drawing process. Because of this short coming, I am not sure as to the strength of the part. Thank you in advance for your thoughts I have seen the evils of procrastination and plan to change my ways tomorrow! Bill Modified by bilbat at Tue, Jul 06, 2004, 10:04:13

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Re: Yield Strength of Work Hardened Steel
Re: Yield Strength of Work Hardened Steel -- bilbat	Post Reply	Top of thread	Forum

Posted by: bilbat ® 07/26/2004, 13:50:17 Author Profile Mail author Edit

As follow up on this subject I offer the following. There is no dependable method of converting hardness to yield strength. However, there is a reasonable way to estimate the ultimate tensile strength. The conversion equations can be found in the American Society for Metals’"Metals Handbook Desk Reference”. The conversions are intended for carbon and alloy steels in the annealed, normalized, and quenched-and-tempered conditions. Although the conversions are said to be accurate within 2 KSI of published values, such conversions are approximations and therefore should be verified thru lab testing. I have seen the evils of procrastination and plan to change my ways tomorrow! Bill

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Re: Yield Strength of Work Hardened Steel
Re: Re: Yield Strength of Work Hardened Steel -- bilbat	Post Reply	Top of thread	Forum

Posted by: Labtechy ® 06/20/2005, 12:56:21 Author Profile Mail author Edit

I have tested a variety of metals an found this process to be "OK". We often check various test samples that we have done tensile tests on to verify this procedures accuracy. I cannot vouch for the "2ksi". We use it if the testing machine malfunctions and the test is nulled however this would be cosidered for information only.

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