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Subject: Re: Zinc Alloy 3 mechanical properties
Author: Reed Joe reedjo@
Date: 1999-08-09 08:33:00

Mladen:

I have experienced the same "phenomena" with large stainless steel castings
for hydro electric turbines and associated equipment. That is, the material
we bought was always better than the text book or ASTM specs for the
material. Knowing this, and that the foundry was not doing anything special
to achieve this extra strength, we would often issue our own material
specification (sort of a revised ASTM spec) so our designers could take
advantage of this strenghth. (We had to do this becuase our customers always
required FEA proof that the part satisfied contract required stress limits
which were often a function of yield or ultimate strength.)

Chris Wright's response regarding the nature of castings is a very valuable
input. If your project merits the expense of a "revised material spec" be
sure to get a complete certification including fracture toughness,
preferably from a sample taken from one of your parts. If not, continue to
design with the added 50% strength and sleep well at night.

JAR

Joseph A. Reed, PE
Member Technical Staff - TTD Engineering Lancaster
Thomson Consumer Electronics
1002 New Holland Ave.
Lancaster, PA 17601

Phone: (717) 295-6006
FAX: (717) 295-6045
e-mail: reedjo@i...

> -----Original Message-----
> From: mladenm@i... [SMTP:mladenm@i...]
> Sent: Sunday, August 08, 1999 5:13 AM
> To: xansys@o...
> Subject: [xansys] Zinc Alloy 3 mechanical properties

> From: mladenm@i...

> Hi group.

> Part made of Zinc Alloy 3 (die casting) breaks at almost 50% higher
> stresses (loads) than it should according to textbook mechanical
> properties data (i.e. YS=220MPa, UTS=283MPa; opposed to actual breaking at
> load that causes approx. 420MPa average! -> matches my calcs).

> Any idea where to find not so conservative data (or, shall I put it -
> correct) on Alloy 3?....
> Or, I'll end up with re-testing the material and use my own data?

> Regards,
> Mladen

> P.S.
> i. Right, I know that this particular part will
> work o.k. but I'd like to confirm this
> material behavior for further designs where
> I won't have resources to do physical testing.
> ii. I've tried few Zinc associations,
> institutions web sites, but all of them are
> offering same numbers.

Posts possibly associated with message #3856AuthorDateScore
3830Zinc Alloy 3 mechanical propertiesmladenm@1999/08/08 
3831Re: Zinc Alloy 3 mechanical propertiesVince Adams1999/08/08 
3832Re: Zinc Alloy 3 mechanical propertiesMichael Hiller1999/08/08 
3833Re: Zinc Alloy 3 mechanical propertiesChristopher Wright1969/12/31 
3834Re: Zinc Alloy 3 mechanical propertiesSanjeev Srivastav1999/08/08 
3838Re: Zinc Alloy 3 mechanical propertiesThomas W. Davis1999/08/09 
3839Re: Zinc Alloy 3 mechanical propertiesJoe Stocks Joe_Stocks@1999/08/09 
3843Re: Zinc Alloy 3 mechanical propertiesPrapoj Phataraphruk1999/08/09 
3856Re: Zinc Alloy 3 mechanical propertiesReed Joe reedjo@1999/08/09