4130 Fatigue Strength and Cost

[Chas]

We're designing rear uprights for our car using .032 in normalized 4130 sheet metal and welding it together. Any suggestions on how to find the fatigue strength?

Also, we can't find good prices on the metal. We called one place and he said the metal would cost us $700 for 3 uprights!

[Chas]

We're designing rear uprights for our car using .032 in normalized 4130 sheet metal and welding it together. Any suggestions on how to find the fatigue strength?

Also, we can't find good prices on the metal. We called one place and he said the metal would cost us $700 for 3 uprights!

[B Hise]

Try dillsburg aeroplane works. The owner is pretty grumpy, but the price is right.

717-342-4589

[Travis R]

Jimminy Christmas! $700?
I just built welded sheet metal uprights for one of our old cars. I think all the raw materials cost me about $50. Try www.aircraftspruce.com (http://www.aircraftspruce.com)
Or better yet, here's a direct link to the 4130 sheet page:
http://www.aircraftspruce.com/catalog/mepages/4130sheet.php
Yeah, I'm a nice guy. http://fsae.com/groupee_common/emoticons/icon_smile.gif

[buddy]

Mil 5 handbook is a good starting point for fatigue strength, remember to make note of what temper you are using.

http://ansys.net/ansys/?mycat=matl

there's a link to it here...

[Chas]

I swear the guy was trying to gouge us because we hadn't bought from him before.

[romkasponka]

What thickness i should use for uprights?

[Jonathan D]

Your analysis should tell you that.

[Lyn Labahn UW-Madison]

I am assuming you are an ME. If you have taken a design of machine elements course your book should have lots of tables, formulas, graphs etc. for estimating fatigue strength. If you haven't taken the class yet, talk to an older member of your team and see if you can borrow the book.

I second the vote for buying the material from spruce as well, they are fairly fast and have decent prices. Look into finding a sponsor that can laser cut all of your sections for you, it will save you lots of time. I would avoid water jet because it can make the metal rusty as hell, and with .032 you don't have a lot of room to give for rust.

[Lyn Labahn UW-Madison]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by romkasponka:
What thickness i should use for uprights? </div></BLOCKQUOTE>

Where do these people come from that ask these kinds of questions? I am serious.

[Mark Bacchetti]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">What thickness i should use for uprights? </div></BLOCKQUOTE>

So are liberal arts majors building fsae cars now'n'days? http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

-Mark

[Cement Legs]

Why not... they have the time http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

[EgyptianMagician]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Cement Legs:
Why not... they have the time http://fsae.com/groupee_common/emoticons/icon_biggrin.gif </div></BLOCKQUOTE>

you guys are so mean sometimes ! Why don't you lay off and just fedex him the parts that he needs ... to spec ... with 0% tolerance ... made out of kryptonite ...

[romkasponka]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Lyn Labahn UW-Madison:Where do these people come from that ask these kinds of questions? I am serious. </div></BLOCKQUOTE>

I'm not building formula SAE (unfortunatly), because i have finished university 2 years ago and my speciality is aviation radioelectronics. I'm from Lithuania if you mean my english http://fsae.com/groupee_common/emoticons/icon_smile.gif
I working on my project alone and it's hard to do analysis for all parts. I'm building motorcycle rear engined car and i has found a lot intresting solutions in yours projects, but to calculate and to draw evrything....hmm, i think it will take about 5 years http://fsae.com/groupee_common/emoticons/icon_smile.gif

[EgyptianMagician]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by romkasponka:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Lyn Labahn UW-Madison:Where do these people come from that ask these kinds of questions? I am serious. </div></BLOCKQUOTE>

I'm not building formula SAE (unfortunatly), because i have finished university 2 years ago and my speciality is aviation radioelectronics. I'm from Lithuania if you mean my english http://fsae.com/groupee_common/emoticons/icon_smile.gif
I working on my project alone and it's hard to do analysis for all parts. I'm building motorcycle rear engined car and i has found a lot intresting solutions in yours projects, but to calculate and to draw evrything....hmm, i think it will take about 5 years http://fsae.com/groupee_common/emoticons/icon_smile.gif </div></BLOCKQUOTE>

hmmm ... maybe we could all collaborate and build some kind of super car-plane !

[Chris Allbee]

matweb.com has a lot of material specifications for just about any material.