Calculation help

[Mysfyt]

Need to know the deflection of 2-1/2" round steel bar, 44" long supported on both ends with 1000 lbs load in center. The bar is hardened to 100 ksi.

 

[Mendonsy]

I found an online calculator that seems to do what you want.
Deflection Calculation

 

[RedNeckRacin]

I found an online calculator that seems to do what you want.
Deflection Calculation

Wrong calculator. Th at evenly distribution of load. .009" is what I got.

Structural Beam Bending Equations / Calculation Supported on Both Ends Single Load at Center | Engineers Edge | www.engineersedge.com

 

[Mendonsy]

OK ..... then it would be this one.
Deflection calculation
The distributed load comes out as .019 and the point load comes out as .031.

 

[jb1390]

Need to know the deflection of 2-1/2" round steel bar, 44" long supported on both ends with 1000 lbs load in center. The bar is hardened to 100 ksi.

How is the end of the bar supported? Into a rigid structure (concrete wall or similar), or supported from underneath? It will make a pretty significant difference in the result.

Also the yield strength of the material (100 ksi), won't make a noticeable difference in the deflection. It will, however, affect the load which the bar will carry and still be able to return to its original shape when unloaded.

 

[Mysfyt]

How is the end of the bar supported? Into a rigid structure (concrete wall or similar), or supported from underneath? It will make a pretty significant difference in the result.

Also the yield strength of the material (100 ksi), won't make a noticeable difference in the deflection. It will, however, affect the load which the bar will carry and still be able to return to its original shape when unloaded.

I'm designing a fork attachment for my tractor and item #1 is the bar in question. It will be supported by welded on collars to the side plates.

 

[LD1]

If it is like a typical forklift carriage, that bar dont really see a downward deflection, rather a forward deflection as the forks act as a lever to pry it out.

Depending on how far out on the forks the load is will change the deflection

 

[Egon]

On this one it would be interesting to see a force vector diagram on the tube at the center point.

 

[MMagis]

LD1 is correct, that bar is subjected to as much horizontal force as it is vertical, if not more. You also need to define the width of the center support, in this case the two fork brackets, as well as how the two ends are supported including the span of the end supports like jb1390 noted. It's much more complicated than a simple deflection calculation.

 

[mwb]

2-1/2" round bar? That will be almost 60 lbs of steel... do you mean pipe? How about adding a center support and using 1 or 1-1/4 bar?