Questions tagged [deflection]
The deflection tag has no usage guidance.
57
questions
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How much deflection can/should I accept with Aluminum Extrusions?
I plan building things with aluminum extrusions.
On this website I can calculate the deflection depending on the profile length and load.
https://8020.net/deflection-calculator
I.e. if I select a 20/...
0
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1answer
36 views
How to determine beam deflection with this unusual configuration (diagram attached)
So I've got a support system shown here in the attached image. Comparing configuration "A" to "B" it seems intuitive that "A" could support a larger load. The stubs are ...
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2answers
57 views
How does the stiffness of semicircular beams connected in series increases?
I am working to reduce the deflection in a cantilever/ dive board at work.$300 mm(L) \times 30mm(B) \times 2 mm(H)$, i.e. it's a rectangular cross section currently.
I can't change the material, or ...
0
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1answer
31 views
Calculating the load on the end of a beam
We ordered a really nice light for our dinner table and ordered a special "lightswing" seperatly.
The light that we ordered however is heavier than the 'lightswing' is rated for.
Please see ...
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4answers
107 views
Deflection of a fixed-fixed pvc pipe under self weight
I would like to start by saying I am not an engineer, so I apologize if this question seems simpleminded.
I am making a manual tarp reel from pvc pipe, and I am trying to decided whether to use ...
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2answers
99 views
Multiple varying cross section beam with uniform loads
I have the following cantilever beam problem where I need to find the deflection of the tip at P.
I tried to compute the deflection of the beam using Castignliano' s theorem as described in this ...
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0answers
98 views
Large deflection of a non prismatic cantilever beam under distributed load
Here's what I got trying to calculate the large deflection of a cantilever beam with two different cross sections under a uniformly distributed load:
From the figure, the shear force is:
$$
V(s) = q(...
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2answers
82 views
How can I find deflection in a member that doesn't have a constant area moment of inertia?
I'm trying to calculate the maximum deflection in a simply supported member with a uniformly distributed load. The trouble is this member does not have a constant area moment of inertia. I've drawn a ...
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1answer
59 views
simply supported beam with a midspan load
First off non-engineer apologies,
A plate of 5251 Aluminium is used to support the load of a centrally seated human I estimate a load of 1 kilonewton.
The beam measures a length of 1000mm, 100mm wide.
...
0
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1answer
58 views
Deflection of a cantilever beam composed of separate (not bonded) planks Uniform load
This is related to this question
It is the case of a simple cantilever beam having a uniform rectangular cross-section.
cantilever beam composed of separate planks - taken from
The question in the ...
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2answers
291 views
Deflection of a rectangular plate simply supported (transverse load)
I am looking for the formula allowing to calculate the deflection of a rectangular plate with a "transverse loading in its center" (maybe the kind of loading will be more clear with this picture :
I ...
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306 views
Sign convention for deflection and slope of beam?
What is the sign convention for deflection and slope of a beam as shown in the diagram below?
When I derive the formula using Euler-Bernoulli for deflection and slope myself, I end up with - ...
0
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1answer
139 views
Calculate deflection of a beam with an arbitrary shape
I have a beam with rectangular cross section, but rather an strange shape in the length wise direction as seen below:
So I have taken out the symmetry part of it:
And it actually has some nice ...
1
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2answers
195 views
How to determine the deflection of a wire mesh under wind load?
I am trying to extend a metal wire mesh over a large distance, while tensioning it to limit the deflection of the mesh due to the wind as much as possible. After doing some research I came across ...
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1answer
43 views
Flexure Deflection - Both ends fixed (one translation free)
I have a flexure problem. One of its ends is fixed to a frame (say F1) which is stationary (no rotation & no translation) and the other end is also fixed to another frame (say F2) which can move ...
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2answers
70 views
Deflection In Multistory Structure
When analysing and designing a structure for the serviceability limit state the deflections of each beam must be found. When considering a multistory rigid jointed structure (as below) and applying ...
3
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1answer
1k views
What plastic material is best for a snap-fit design?
I'm designing a plastic holder that will secure a metal part with snaps. Which plastic will be able to take multiple removals and re-insertions without getting weaker (bent out of shape) over time?
[...
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0answers
39 views
How to calculate load on roller to create given deflection?
I am trying to calculate what loading on a fixed roller will create a predetermined maximum deflection. I ran some calculations, but the values I'm getting are significantly lower than I would expect. ...
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1answer
46 views
How to size a rectangular steel tube to hold certain weight?
I would like to build a shelf (1m width and 0.5m depth) using only four rectangular steel tubes on for legs.
Each legs are at the end of the rectangular tube.
I would like to put 500kg on the tubes, ...
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2answers
81 views
How to calculate the deflection of beam that is reinforced through formula?
Example an aluminium tube reinforced with steel tube inside.
100*50*2mm thick aluminium with 80*40*3mm MS tube
0
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2answers
183 views
Pin joint system displacement question
A pinned system comprising bars of the same material and cross-sectional area is subjected to a vertical load P.
I am required to form a relationship between FAB and P.
The first part of the ...
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2answers
131 views
Why does rebar in reinforced pre-stressed conrete reduce in deflection if compressive stress is applied to member?
According to What is Prestressed Concrete? - Practical Engineering, one way to reduce deflection in the steel rebar is to pre-stress the rebar by applying compressive stress in the member before ...
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2answers
76 views
Where is the axis of bending for a box lifted by a crane?
A box is being lifted by a crane. Sometimes the box will be completely full, and sometimes it will only be partially full (indicated by the gray shaded regions).
The question is, where is the axis of ...
0
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1answer
173 views
simple supported Beam deflection question involving two point loads and a UDL
so i was given a problem by my mechanical principles teacher to work out the max vertical deflection of a simply supported beam with two point loads one a distance of 5.3 away from A and another 5.9 ...
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1answer
141 views
FEA: What is the difference between a spider of RBE2s and multiple SPCs
I am not sure what the difference is between using a spider of RBE2s. and multiple SPCs across a face. I've heard that the spider is the more accurate method as multiple SPCs make the model overly ...
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2answers
1k views
Deflection of Rectangular Plate with 2 Simply Supported Edges
As shown in the figure provided, a Uniform load acts upon a rectangular plate with edges at Y = 0 and Y = b which are simply supported.
Using this form of the Plate Equation:
$\frac{\partial^4 \...
2
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1answer
117 views
Why do we increase the minimum beam/slab depth if we increase the grade of the reinforcement to control the deflection
I've just started to study reinforced concrete design and I came across this
in the "Design of Concrete Structures" by Dr.Nilson.
and I was wondering why do we increase the minimum thickness if we ...
1
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0answers
217 views
Simple beam deflection of cantilever beam
Recently I had need to prove the beam deflection equation for a simple cantilever beam with a point load at the end. The equation would be in reference to the Euler-Bernoulli theory taught in most ...
2
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0answers
31 views
Most efficient way for finding the rotation angles after moment distribution (Cross method)?
First of all, I have taken a look at the Grinter's method, which is similar to Cross, but balancing angles instead of moments. My question assumes that we are using the Cross method, and not the ...
1
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1answer
273 views
How can I calculate the maximum load of a steel box section frame?
Is it possible to calculate the maximum load of the steel structure shown in the image using its dimensions?
2
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3answers
2k views
Deflection of a cantilever beam composed of separate (not bonded) planks
In the case of a simple cantilever beam having a uniform shape and being loaded at its end - the calculation of the deflection at any point along the beam is well known.
What happens if we split it ...
2
votes
1answer
872 views
Bending equation and max deflection of UDL and multiple point loads
I have a beam, simply supported with 2 points loads and 2 UDLs. The loads are symmetric about the centre of the beam.
I've tried to derive an expression for the moment along the beam and then via 2 ...
2
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2answers
149 views
Deflection of a stack of disks under applied force/pressure
I'm trying to calculate the deflection of a stack of metallic disks, when subjected to a force.
In the case of the figure below, representing a valve for a shock absorber, the force is due to a ...
1
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1answer
143 views
Which diameter and thickness pipe to choose
I'm building a roller for a "pool" cover I got at home. The cover weighs 10kg (8kg but I'm considering some weigh added by the water present on it). I have a bosch profile structure where I will ...
0
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3answers
154 views
What is the minimum diameter necessary for 2 linear motion shafts to deflect less than 0.05mm when a 2kg weight is in the centre?
I am planning to build a large scale 3D printer that will utilise 2 1000mm linear motion shafts that each have a young modulus of 210 GPA. The ends of the shafts will be secured in a block of plastic ...
2
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0answers
92 views
Determining the load on a pump vibration isolator
It seems to me that pump vibration isolators need to support:
The weight of the pump
The weight of the water in the pump
The weight of the water (only) in the drop to the pump
The supplier of ...
4
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2answers
4k views
Round beam deflection under its own weight
I'm trying to calculate how much simply-supported round beams of several materials and diameters deflect under their own weight plus an additional weight in the middle.
I know the material densities ...
2
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4answers
1k views
Structural Frame Real World Deflection
In the real world, would this pinned frame exhibit a deflection in the fixed, left hand side column?
Arguments from peers largely surround:
1) There wouldn't be left-column horizontal deflection ...
0
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1answer
40 views
Validation of Lightweight Chassis (measuring deflection of structures/strain gauging)
How can we validate the structural integrity of a small lightweight chassis manufactured from 6063-T6 aluminium that has been welded and then heat treated (back to t6 condition)? A simple FEA model ...
3
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1answer
243 views
How to calculate filament deflection and force applied to teeth by toothbrush bristles?
I am trying to get my head around the behaviour and the effectivity of the the filaments movement of a toothbrush inside your mouth. I want to know the mechanical formulas and/or properties that I ...
0
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1answer
2k views
What is the formula for deflection of an end-loaded cantilever rod beam?
For a cantilever beam of circular cross section, loaded at the end, how does the deflection of the free end vary as a function of beam length and diameter?
I expect the answer will be something like:
...
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2answers
209 views
Why does a simple pin-ended triangular (arched/curved) beam deflect more due to secondary effects (non-linear analysis)?
I cannot wrap my head around this.
I have made two simple models, a triangular (or curved or arched) beam that is pin ended and has a single point load of 1N downwards at it's center, and a flat beam ...
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0answers
58 views
Countertop Span/sag Calculations [closed]
I came upon enough 3"x3" structural aluminum square tubing to build a countertop over the washer, dryer, and sink. I wanted to double check the sag/deflection of the tubing but am having trouble ...
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1answer
4k views
How can we know “by inspection” the location of maximum deflection of a simply supported beam with a point load?
I am working the following problem:
The simply supported beam shown in Fig. 12-12a is subjected to the
concentrated force P. Determine the maximum deflection of the
beam. EI is constant.
...
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1answer
1k views
How to calculate deflection of a cantilever beam subject to point loading
I am trying to solve the following beam deflection problem:
The cantilever beam is subjected to the point load at C.
Generate the equation for the elastic curve by using the double ...
4
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2answers
151 views
Undesired vibration of a beam under foot traffic
The other day I was in the waiting room of a doctor's office in a new building as part of UCLA medical complex. A new construction as part of multi million dollar extension of existing medical complex ...
5
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1answer
84 views
Can the thickness of a guard post be derived purely from energy principles?
Consider an ordinary staircase with a banister rail supported by a wall at one end and a steel post of constant profile at the other end. The base of the post is embedded rigidly in the fabric of ...
4
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3answers
970 views
Deflection of thin plate with 1 free edge and deflection > thickness
I have an thin uniform rectangular steel plate supported on 3 sides and free on one, and supporting a uniform load.
I'm trying to determine what thickness of plate I need to keep deflection below a ...
4
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1answer
2k views
Deriving the deflection force equation for a beam that is fixed on both ends
I want to calculate the force-displacement equation for a beam that is fixed at both ends. I think I should use the superposition principle but I am not very sure how to get started.
I know that for,...
1
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1answer
2k views
How determine the compression of a beam with a concentrated end load in the x axis?
I'm studying Electronics Engineering so I have almost no background in mechanics, just a little of statics and dynamics. I have recently started an internship in an investigation center where they ...
