View Single Post
  #3   Spotlight this post!  
Unread 04-02-2014, 14:34
apalrd's Avatar
apalrd apalrd is offline
More Torque!
AKA: Andrew Palardy (Most people call me Palardy)
VRC #3333
Team Role: College Student
 
Join Date: Mar 2009
Rookie Year: 2009
Location: Auburn Hills, MI
Posts: 1,347
apalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond reputeapalrd has a reputation beyond repute
Re: pic: 1648 Painted Frame / teaser 2

Quote:
Originally Posted by notmattlythgoe View Post
Would you mind pointing me to the data that backs this up?
I was curious too, so I ran some simulation (using Inventor's FEA tools) and found that 8020 is in fact significantly weaker in torsion and slightly weaker in bending. I can't attach images to a CD-media, so I'll summarize the results:

For bending, I constrained both ends of a 1' beam and applied a load to the top face. For torsion, I constrained one end of the same beam and applied a torque to the other.

100lbf load on top face of section, ends constrained:
0.001536" max deflection 8020 (load split between two top flanges on either side of groove)
0.001614" max deflection 0.063"
0.001006" max deflection 0.125"

200 in-lbf torque at end of section, other end constrained:
0.1311" max deflection 8020
0.01055" max deflection 0.063"
0.006772" max deflection 0.125"

The weight of 8020 vs 0.125" 1x1 box is virtually the same, 0.063" would be roughly half.
__________________
Kettering University - Computer Engineering
Kettering Motorsports
Williams International - Commercial Engines - Controls and Accessories
FRC 33 - The Killer Bees - 2009-2012 Student, 2013-2014 Advisor
VEX IQ 3333 - The Bumble Bees - 2014+ Mentor

"Sometimes, the elegant implementation is a function. Not a method. Not a class. Not a framework. Just a function." ~ John Carmack
Reply With Quote