Questions tagged [moments]
122 questions
8
votes
3 answers
Calculating moment of inertia for a hollow discontinuous circle?
This is a pretty simple problem, but I'm just not sure how to go about it. I want to find the moment of inertia of a discontinuous hollow circle. But since the shape is so irregular, I'm not sure how to go about solving for it. I've posted the shape…
tempestwing0101
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5
votes
2 answers
Determine the moment of inertia of a filled circular sector
Does anyone know how to determine the moment of inertia of the filled circular sector shown below?
Apparently I have to use $dA=r\ d\theta\ dr$, $y= r\sin(\theta)$ and end up getting $I_x=\frac{r^4}{8}(\alpha-\sin(\alpha))$
But I have no idea how…
strateeg32
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5
votes
3 answers
is bending moment on roller supports at beams zero?
isn't the bending moment supposed to be zero on roller supports at beams?
then why isn't it zero here in this picture at x=2?
niosha afsharikia
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4
votes
1 answer
Skewing of joints using virtual work
Given ist the following framework:
$$E=210 \frac{\text{kN}}{\text{mm}^2}$$
$$ EA \to \infty $$
$$ I_1 = 80000\text{cm}^4 $$
$$ \frac{I_1}{I_2} = \frac{3}{4} $$
$$ I_3=I_1 $$
Using the principle of virtual work, I'm suppossed to figure out by what…
Skydiver
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3
votes
2 answers
Parallel beam load cells, force transfer and maximum load
I'm going to experiment with a parallel beam load cell like this one: https://cdn.sparkfun.com/datasheets/Sensors/ForceFlex/TAL220M4M5Update.pdf. I've read somewhere that for a setup shown on this picture:
the response of the cell is largely…
Paul Jurczak
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3
votes
0 answers
Optimization: Most efficient way for multiple people to move boxes
We are moving house in a few weeks and have a couple of people helping moving the boxes. My previous experience from moving is of queues building up in small hallways and people getting tired from walking up and down the stairs, so this time, I…
user29236
3
votes
1 answer
Why is the bending moment equation for a uniformly distributed load (w) across a length x on a structure given by w(x)(x/2)?
So for any structure, simply supported beam, three hinge frame, cantilever etc. where there is a uniformly distributed load. For example, for a simply supported beam with uniform load of w along the length of x. Why is the bending moment equation…
Albert
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3
votes
1 answer
A way to calculate the magnitude of the moment
In my engineering textbook, I didnt understand the example given to explain the magnitude of the moment. It asks to calculate the magnitude of the moment about the base point O of the 600-N force in five different ways. Now, I dont understand the…
ASB
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3
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1 answer
What are the principles (if there are any) behind the conservation of bending moment in frame analysis?
I notice from this question that the moments at joint connection are somehow "conserved", or being "transferred" from one element to the others. In other words, there are no "missing moment".
Note that at joint for left image:
$$2.767\text{…
Graviton
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3
votes
4 answers
Different measured strain in beam experiencing pure bending
I have a beam experiencing a pure bending moment. The setup is similar to this image from these lecture notes (with different values).
Using the flexure formula, we can determine that the stress (and thus the strain) at any point along the top of…
Voriki
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2
votes
2 answers
Could moment be an imaginary concept?
In the figure above, a horizontal singular force is applied to a column from its end point. If we examine the column with the finite element method, we see that there are tensile and compressive stresses at its base. If we can show these tension…
Bilgehan Yılmaz
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2
votes
4 answers
Is bending moment along a beam independent of the cross sectional area of the beam?
We know this that if the a cantilever beam (of any cross section) is fixed at one end and a transverse force is applied on the other, then it will bend. However, we just casually assume that the moment only depends on the type of transverse loading…
Rameez Ul Haq
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2
votes
2 answers
How do you calculate the shear force on the screws that connect a door to a jamb via hinges
I'm trying to calculate the shear forces on hinge screws or bolts. Here is a schematic of the door with the relevant values:
First, I took a free body diagram of the door and its hinges. The calculations to find the forces are also shown below. …
Ryan
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2
votes
1 answer
Rubik cube torque experiment - Correct equations and experiment set up?
Background
I am attempting to experimentally find out the average torque required to rotate a single face of a Rubik cube. Little to no data is available as it varies from cube to cube. Some people have used a torque wrench but this is not an option…
Josh
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2
votes
1 answer
Is there a moment at a point between two connected sliders, when one is subjected to a force? (schematic shown)
Background: I'm designing a machine that uses an actuator to push an object. The connecting component may not take certain bending forces, therefore I'm trying to evaluate the system with a free body diagram.
The moving system is support by…
Manohar Nayak
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