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Old 12-19-2006, 09:11 AM
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Originally Posted by 95naSTA
Machine Theroy and Design.
The book written by a guy named Leroy?
Old 12-19-2006, 09:12 AM
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Originally Posted by 95naSTA
Its strange it says data points with AA are not for design.
The type of text I got that out of is Machine Theroy and Design.
I think that is because the actual values will vary by the company that manufactures the metal. Where slightly different processes will yield different strengths
Old 12-19-2006, 09:22 AM
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Originally Posted by willwren
The book written by a guy named Leroy?
Nope. I did have the class with a guy named Leroy Alaways though.
The actual name of the book is Mechanical Engineering Design.

corevettecrazy,
What value did you get when you calculated it?
Old 12-19-2006, 09:29 AM
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the calculated value is 18.95424837 (copied right from excel)

also does this make sense.
We need to find the work deforming and rupturing the specimen. Since the machine does not measure the length per time or load, creating an integral is sort of a pita. But I have the Toughness modulus, which is equal to the area under the stress strain curve.
The area is equal to the strain engery density (u). The strain energy (U) is another name for the work done. So if I were to multiple u by the volume of our piece then I would get approximately the amount of strain engery(work done)

does that sound right?
Old 12-19-2006, 09:36 AM
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Originally Posted by My Father In Law
% Elongation in 2" of length is 19% for 1/2" Diameter 2020 T4 Aluminum.
Does that help?
Old 12-19-2006, 09:43 AM
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Originally Posted by corvettecrazy
the calculated value is 18.95424837 (copied right from excel)
Well in the table I scaned it said Fracture Strain is .18 and isn't % stain just strain x 100?
So 18%?
I'm not positive but it seems to beclose to your calculated value.

I'm not sure about your second question. I'd have to go diggin for that and I'm just getting over food poisoning.
Old 12-19-2006, 09:44 AM
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Originally Posted by vital49
Originally Posted by My Father In Law
% Elongation in 2" of length is 19% for 1/2" Diameter 2020 T4 Aluminum.
Does that help?
awsome...

because our origional length was 1.989" with a diameter of .503inches any chance you know where he got it from. Book name or website. I dont need exact info, just more than "bonneville club member'* father inlaw" lol
Old 12-19-2006, 09:47 AM
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Originally Posted by 95naSTA
Originally Posted by corvettecrazy
the calculated value is 18.95424837 (copied right from excel)
Well in the table I scaned it said Fracture Strain is .18 and isn't % stain just strain x 100?
So 18%?
I'm not positive but it seems to beclose to your calculated value.

I'm not sure about your second question. I'd have to go diggin for that and I'm just getting over food poisoning.
agreed, I guess I miss understood the table. I cant read the note at the bottom but it mentions something about 100. but that is all I can make out of it. Any chance its revilent?
Old 12-19-2006, 10:09 AM
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Originally Posted by corvettecrazy
Originally Posted by vital49
Originally Posted by My Father In Law
% Elongation in 2" of length is 19% for 1/2" Diameter 2020 T4 Aluminum.
Does that help?
awsome...

because our origional length was 1.989" with a diameter of .503inches any chance you know where he got it from. Book name or website. I dont need exact info, just more than "bonneville club member'* father inlaw" lol
Originally Posted by My Father In Law
"ASM Metals Reference Book", 2nd Edition, 8th Printing, American Society for Metals, 1983, page 299.
Old 12-19-2006, 10:25 AM
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thanks to everyone who helped. 1/2 a letter grade higher now secured on this lab.


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