daily doubler build

[Bray D]

Still haven't heard back on the tires.

Did some more work with my sliders. Haven't found anything super conclusive, but I did some hand calcs and got a pretty good grasp on SolidWorks Simulation.

Here's the hand calc stuff, looks like 2x3 is 3.8 times stronger in bending than 1.75" round tube, and 2x4 is over 5 times stronger.

Here's a couple pics to show I've been doing work in Simulation. I hope to eventually analyze the supports running to the frame, and the entire assembly (slider portion with supports). This is a good start anyways.

This is the analysis on the 2x3 rectangle design, .125" thick wall. 2000lbs load applied on 1.75" diameter supports on the edge of the rectangle. Slider has 1" diameter circular contact with the 'rock'.

Deformation plot

Stress plot

 

[nb11]

Ahh, don't you love the benefits of studying engineering? Who knew we could actually use all that stuff they're teaching us!

 

[Bray D]

My truck has been my "engineering in application" project throughout my schooling.

Though learning is forever, the 'studying' is over.

 

[Kage]

ooo Pretty colors!

...Here's the hand calc stuff, looks like 2x3 is 3.8 times stronger in bending than 1.75" round tube, and 2x4 is over 5 times stronger.

So what you're saying is that your sliders will be rock solid, but your frame attachment points should bend nicely

 

[Bray D]

ooo Pretty colors!

Haha, my Senior Design prof hated FEA programs with a passion. Made you confirm your findings with hand calcs or he would pick you apart in presentations. I did the hand calcs, and showed the pretty colors cause they're pretty.

So what you're saying is that your sliders will be rock solid, but your frame attachment points should bend nicely

See below.

I hope to eventually analyze the supports running to the frame, and the entire assembly (slider portion with supports). This is a good start anyways.

 

[Kage]

..See below.

Details! Don't you have some tires you need to buy fawker

 

[Bray D]

Don't you have some tires you need to buy fawker

I'm workin on it! I have the craigslist app on my phone so it'll notify me if anyone posts up about 37's. There's not 1 37" tire on craigslist within a 200 mile radius of me. Unbelieveable.

Still waiting to hear from the guy with the used KM2's. I've been watching the Pirate classifieds like a hawk. I have a feeling I may have to buy new. Damnit.

Oh yeah, and I'm rebuilding my traction bar cause the old one brought the suck. Pulled it off last weekend and gussetted the frame side joint. Hoping to build the rest of it this coming weekend.

 

[kroussinoffroad]

soo uuhhh yeeeaaa.

what your saying is there should be no need to build it, break it & rebuild it

 

[kroussinoffroad]

and have you been checking great lakes 4x4 for tires?

 

[97TrailRigDD]

Bray here is a link to a 37" tire shootout.

http://www.fourwheeler.com/techarticles/wheels/129_1104_massive_mud_tire_shootout_intro/index.html

I bought some used hankook mt tires last weekend and like them so far. But they don't ride as nice as the km2's on the road.

 

[escort_gts]

I'm workin on it! I have the craigslist app on my phone so it'll notify me if anyone posts up about 37's. There's not 1 37" tire on craigslist within a 200 mile radius of me. Unbelieveable.

Still waiting to hear from the guy with the used KM2's. I've been watching the Pirate classifieds like a hawk. I have a feeling I may have to buy new. Damnit.

Oh yeah, and I'm rebuilding my traction bar cause the old one brought the suck. Pulled it off last weekend and gussetted the frame side joint. Hoping to build the rest of it this coming weekend.

Same here. I have the app and had the same saved search for any kind of tires for about a year. Then I just decided to buy new so I would have the lifetime replacement warranty.

 

[Kyle M.]

So what was wrong with your anti wrap bar? Did your shackle limit flex?

Btw, I know someone who works for a big tire dealer that may be able to get you a good deal on tires, but then you would have to drive up here and get em, maybe wheel on our stomping grounds. If you are interested, pm me for details....ill see what I can do.

 

[Bray D]

kroussin - I already built and broke my old sliders. Time to do my homework on the next set.

Greg - good article. I read some of it. I hope to read the review on all of the tires in the next couple days. They found some interesting stuff

Kyle - Old anti wrap did fine but I wasn't pleased with it. It was the first thing I've ever made out of 'shit I had laying around'. 1.5" OD .090wt upper tube and 1.5" x .250wt lower tube. The angle of the lower tube was such that it only protected the last foot or so of my driveshaft. Overall I was just kinda pissed with the outcome. My new one will be out of 1.75x.120wt with the lower being sleeved. It'll be at the same angle of my driveshaft so it'll protect for nearly it's entire length, and it will have a full size flex joint at the frame end rather than the small 2" flex joint I had on it before. And it'll be trussed.

PM sent about the tires.

 

[alboy79]

So what was wrong with your anti wrap bar? Did your shackle limit flex?

Btw, I know someone who works for a big tire dealer that may be able to get you a good deal on tires, but then you would have to drive up here and get em, maybe wheel on our stomping grounds. If you are interested, pm me for details....ill see what I can do.

yea... Like your so special. I knew him first...

 

[Bray D]

Latest with the sliders - I simulated slider designs with 4 different main tube geometries. 2"x3"x.125"wt, 2"x3"x.125"wt skinned with .125" strap, 2"x3"x.1875"wt, and 2"x4"x.125"wt.

You guys are aware of the loading conditions set in place from my other post. I kept everything the same from simulation to simulation, so this is strictly a comparative test.

Here's my findings:

2"x3"x.125"wt - stress at the rock contact

2"x3"x.125"wt skinned with .125" strap - stress at the rock contact

2"x3"x.1875"wt - stress at the rock contact

2"x4"x.125"wt - stress at the rock contact

2"x3"x.125"wt - stress on top of the slider

2"x3"x.125"wt skinned with .125" strap - stress on top of the slider

2"x3"x.1875"wt - stress on top of the slider

2"x4"x.125"wt - stress on top of the slider

See next post for my thoughts regarding this analysis.