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Questions tagged [structural-beam]

A structural element whose length greatly exceeds both its width and height, which are of the same order of magnitude.

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Beam momentum positive/negative sign

Could anyone explain to me why the momentum of this isostatic beam in $A$ is negative instead of positive? Why isn't it as simple as $+FL-FL/2 = +FL/2$?
45 views

In a truss, where is the reaction force acting on?

A truss, its free body diagrams and also of the pin at C is shown in the figure. Ay and P, in figure II may be equated because they are acting in opposite direction on the same body(the whole truss), ...
45 views

Gaussian Beam propogation in a fiber

If we suppose that a Gaussian beam traveles in the fiber with diagonal end as it shown in the image, so I have several questions: 1- Do we get in the end of the fiber Evanescent field (Total ...
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What will happen if I bombard electron beam on metalloid?

I know when we bombard electron beam on metals it gives out X rays, but my question is that what will happen if I bombard electron beam on metalloids?? please give answer
27 views

How Gaussain beam exaclty be after diffraction between two mediums?

How it will be the refraction of the Gaussian beam, does one of its sides will go in distortion, and which equations can predict this distortion? Sure I have to use Snell's law to know the angle but ...
39 views

Writing a two variable function$f(x,t)$ in terms of Dirac-Delta $δ(x)$ function and a function $P(t)$?

How to write a two variable function $f(x,t)$ in terms of Dirac-Delta $\delta(x)$ function and a function $P(t)$? For example; I read something in a book. You can find the following picture. But ...
27 views

In a beam, when there is a UDL present on a small portion, why do we add a UDL above and below of the remaining beam?

In the above image, I need to find the deflection at point C and D of the simple supported beam. Macaulay's method is to be used. To solve this, on part BC a UDL of 1 kN/m is introduced both above ...
68 views

How the length, flexural rigidity and position of attached mass affects the period of oscillaion of cantilever?

Hey everyone, I'm a highschool student from New Zealand and can someone please explained to me with physics principles in words: Why increasing the length of cantilever increases the period of ...
444 views

Understanding positive and negative shear strength sign

Shear strength is a force that tries to keep stuff in equilibrium, when another force tries to break/bend/modify a structure. This "another force" (external force) may also produce a moment. In the ...
60 views

Moment on a body and on a simply supported beam

Consider a body on a frictionless floor being acted upon by a force F as shown in figure. Force acts on its centre of mass. (Centre of mass and centre of gravity coincide in this case, ie, both lie on ...
18 views

Finding Shear Force in a Beam [closed]

I have the following question: The question is asking for the shear force at point C. To work this out, I've determined the reaction force at point A. To find the shear force, the book then sums the ...
44 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 ...
114 views

Poisson's ratio in analytical beam deflection equations

After looking at some of the analytical expressions for analyzing beams, I noticed that none of the equations depend on the material's Poisson ratio. Some analytical expressions can be found in https:/...
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Why is a force omitted when calculating shear force in this structure?

Here is a picture from an example problem I found in my lecture notes. The problem is to find an expression for the shear force at point C. My attempt to solve this was: If we split the beam into ...
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Positron beams and crystallography

I wad mainly reading about impact and uses of positron beam to determine conductivity and the structure of material . Do can anyone just describe how positron beams can determine conductive of ...
20 views

What component of the strain tensor is a strain gauge measuring in a bend test?

I am studying a bend test of a beam. The beam is set up like a 4 point bend. The force is applied at 2 locations on the top surface, and 2 locations on the bottom surface are fixed in place. It is ...
114 views