Plotting a Beam Deflection Graph

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Homework Help Overview

The discussion revolves around plotting a graph of beam deflection across its length, with specific parameters such as Young's modulus and moment of inertia provided. Participants are exploring the relationship between bending moments and deflection using differential equations.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are attempting to calculate bending moments at intervals and are questioning how to derive internal moments. There is uncertainty about whether to approach the problem numerically or analytically.

Discussion Status

Some participants have provided insights into calculating bending moments and the implications for deflection. There is an ongoing exploration of methods to plot the deflection graph, with no clear consensus yet on the best approach.

Contextual Notes

Participants are discussing the need for numerical methods versus analytical solutions, and there is mention of specific values and equations relevant to the problem setup.

stackemup
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Homework Statement


I need to plot a graph showing the deflection of the beam across its length giving a value of x at every 1m.
The youngs modulus for the beam is 210 GNm^-2 and the moment of inertia is 54 X 10^-7 m^4

Homework Equations


Really unsure where to start on this one.

I have found the equation M/IE= (d^2 y)/(dx^2) but I am unsure where to go from here

The Attempt at a Solution

 

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anyone
 
stackemup said:

Homework Statement


I need to plot a graph showing the deflection of the beam across its length giving a value of x at every 1m.
The youngs modulus for the beam is 210 GNm^-2 and the moment of inertia is 54 X 10^-7 m^4

Homework Equations


Really unsure where to start on this one.

I have found the equation M/IE= (d^2 y)/(dx^2) but I am unsure where to go from here

The Attempt at a Solution

Do you know how to calculate M for the beam with the given loading?
 
I have calculated the bending moments at 1m intervals but I am not sure about calculating the internal moment?
 
stackemup said:
I have calculated the bending moments at 1m intervals but I am not sure about calculating the internal moment?
It's not clear what you mean by 'internal moment'. The M which determines the deflection of the beam is the bending moment.
 
In that case, to answer your question, yes i know how to calculate the bending moment(s) of the beam.
 
SteamKing, can you please advise where I need to progress to from this?
 
stackemup said:
SteamKing, can you please advise where I need to progress to from this?
You are asked to plot a graph. Does mean you are expected to do this numerically, rather than by solving a differential equation? I'll assume so.

Starting at the point of support (x=0), you have zero deflection and zero gradient.
You can use the equations you have to find the bending moment there, and hence find (d^2 y)/(dx^2).
If you now step out a distance dx along the beam, what would you estimate y and dy/dx to be there?
 
I have now found the solution. Thanks for the help.
 

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