- #1
Force acting on steel rod (deformation)
- Thread starter foo9008
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- Deformation Force Rod Steel
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Discussion Overview
The discussion revolves around understanding the forces acting on a steel rod, particularly in the context of static equilibrium and deformation. Participants are attempting to clarify the values of forces P1, P2, and P3, and how to calculate them based on the given conditions.
Discussion Character
- Homework-related
- Technical explanation
- Conceptual clarification
Main Points Raised
- One participant expresses confusion about the values of P1, P2, and P3, specifically questioning why P2 is -60 kN and P1 is 240 kN.
- Another participant suggests using a tension force diagram for axial loads on the rod, proposing to plot axial tension against position along the shaft.
- There are repeated inquiries about how to perform a force balance on the entire rod to determine the reaction force at one end.
- One participant mentions the need for a force applied by the wall at location A for static equilibrium, prompting questions about how to find this force.
- Another participant indicates uncertainty about identifying which forces correspond to P1, P2, and P3.
- A later reply questions whether the participant understands how to perform a one-dimensional equilibrium force balance on a solid object.
- One participant provides a formula for calculating the net force acting on the rod, suggesting a specific calculation.
Areas of Agreement / Disagreement
The discussion reflects a lack of consensus, with multiple participants expressing confusion about the forces and how to calculate them. There are competing views on the approach to take, particularly regarding the identification of forces and the method for achieving static equilibrium.
Contextual Notes
Participants have not reached a resolution on the values of P1, P2, and P3, and there are indications of missing assumptions or definitions regarding the forces acting on the rod. The discussion also highlights uncertainty in applying the principles of static equilibrium.
- #2
Nidum
Science Advisor
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In the same way that you can do a shear force diagram for lateral loads on a beam you can do a tension force diagram for axial loads on a shaft .
Basically plot a graph of axial tension against position along shaft . Have a try .
Basically plot a graph of axial tension against position along shaft . Have a try .
- #3
foo9008
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What do you mean? can you explain further?Nidum said:
- #4
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If you do a force balance on the entire rod, what do you get for the reaction force on the left end?
- #5
- #6
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You have 3 forces acting on the rod: 300 kN, 180 kN, and 120 kN. In order of the rod to be in static equilibrium, there must also be a force applied by the wall on the bar at location A. What does that force have to be?foo9008 said:
- #7
- #8
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Forget about P1, P2, and P3 for now. Are you saying that you don't know how to do a 1 dimensional equilibrium force balance on a solid object?foo9008 said:
- #9
foo9008
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yesChestermiller said:
- #10
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F = 300 -180 + 120
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