Deflection of a Cantilever with support

In summary, the model has three rods connected by a plate. The middle rod is longer and has a deflection due to the force applied.
  • #1
Firzan
3
0
I sketched out a slightly simplified model. It is a cantilever rod with two supporting rods of slightly larger diameter, connected by a plate. (Ignore the weight of the individual parts. For illustration purposes, I draw this to resemble a cantilever beam from the side view but in actual design, this drawing is actually the top view.)
My aim is to theoretically calculate the deflection/bending in the rods (more importantly, the two side/supporting rods) due to the force applied. The plate can be considered rigid.

I'll break down the question into two parts, so that I can understand the concept better:

1. If the three rods were of the same length (the middle rod is not extended and force is applied at the end of the three rods), how do I calculate the forces acting on each rod and then the deflection?

2. With the middle rod being longer than the supporting two rods. How should I approach calculating the deflection in each of the rods?
 

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  • #2
If you assume the plates are rigid and rigidly attached to the rods, they could not allow any deflection along the full length they are attached to. I think you need to rethink that assumption.
 
  • #3
After another look, I'm not sure I understand what your rigid plate looks like. I thought it was 500mm x 200mm extending to the support surface, but now I'm thinking it only exist in the plane that is 500mm away from your support surface. If this is the case, the plate constrains all three beams to have the same deflection at 500mm from the support?
 
  • #4
For #1. I'm pretty sure you can just add the 3 rods moment of inertia and use the total for your deflection equation y = F*L^3/(3*E*Itotal)

For #2. Start with #1 where L = 500. Then just think of the middle beam as starting at the L=500 location and add the additional deflection to the deflection from #1.
 
  • #5
The plate connects the three rods/beams 500mm away from the support surface. So yes, since assumed to be rigid, the plate would constraint the three to have the same deflection.
 
  • #6
What if the plate was not rigid? Say, it has a rectangular profile of 125mm*30mm. How would I then calculate the X-axis deflection on the rods?
Also, what other things should I take note of? (ie possible bending of the plate, etc?)
 

1. What is a cantilever with support?

A cantilever with support is a structural element that is fixed at one end (known as the support) and free at the other end. It is commonly used in engineering applications such as beams, bridges, and buildings.

2. What is deflection of a cantilever with support?

Deflection of a cantilever with support refers to the amount of bending or displacement that occurs when a load is applied to the free end of the cantilever. This is an important factor to consider in the design and analysis of structures to ensure they can withstand the applied loads without failing.

3. How is the deflection of a cantilever with support calculated?

The deflection of a cantilever with support can be calculated using the appropriate formula, depending on the type of loading and support conditions. For example, the deflection of a cantilever with a point load at the free end can be calculated using the equation: d = (FL^3)/(3EI), where d is the deflection, F is the applied load, L is the length of the cantilever, E is the modulus of elasticity, and I is the moment of inertia.

4. What factors affect the deflection of a cantilever with support?

The deflection of a cantilever with support is affected by several factors, including the type and magnitude of the applied load, the length and stiffness of the cantilever, and the support conditions at the fixed end. Additionally, the material properties of the cantilever, such as the modulus of elasticity and moment of inertia, also play a role in determining the deflection.

5. How can the deflection of a cantilever with support be minimized?

The deflection of a cantilever with support can be minimized by using a stiffer material for the cantilever, increasing its cross-sectional area, or reducing the length of the cantilever. Additionally, adding additional supports along the length of the cantilever can also help to decrease the deflection. Properly designing and analyzing the structure using appropriate load and support conditions is crucial in minimizing the deflection of a cantilever with support.

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