Question about Statics problems involving frames

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SUMMARY

This discussion focuses on the application of moments in mechanical engineering frames, specifically when analyzing frames with multiple members under a couple moment. The participants clarify that when a moment is applied to a member, it affects all points along that member, and its influence on neighboring members depends on their connection and ability to transfer torque. The conversation emphasizes the importance of understanding the real-world implications of moments as forces acting on levers, particularly in the context of free-body diagrams.

PREREQUISITES
  • Understanding of mechanical engineering concepts, specifically frames and members.
  • Familiarity with free-body diagrams and their application in statics.
  • Knowledge of moment and torque transfer between connected members.
  • Basic principles of forces and levers in mechanics.
NEXT STEPS
  • Study the principles of moment application in mechanical frames.
  • Learn how to construct and analyze free-body diagrams for complex structures.
  • Explore torque transfer mechanisms in connected mechanical members.
  • Review resources on beam bending and frame deflections from Engineers Edge.
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Mechanical engineers, students studying statics, and professionals involved in structural analysis and design of frames will benefit from this discussion.

Yossi33
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Homework Statement
solving frames problems
Relevant Equations
couple of forces
hello, i have a question in this topic of frames in mechanic engineering, if i have a problem with 3 or 4 members that connected and a moment of couple is applied at specific frame,a moment of couple is general and is applied at any given point of the body. so when i dismember the frame and draw a free-body diagram of each member do i need take the couple in each member or just the member it works on ? thanks
 
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What type of frame are we discussing?
Is the moment co-planar with the frame?
How are the members connected to each other and to the ground?
 
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question 8.png
for example in this problem a 3knm moment is applied at point G of CDE member and now if i dismember CBA and try to calculate moment in Z axis do i need to take this moment?
 
Once a punctual moment is applied onto a member, any point of that member is under the influence of that moment.
Whether or not that influence is transferred to a neighbor member, depends on the capability of the point at which they meet to transfer torque; hence, the reason behind my third question.

A moment is just a concept; in the real world, you only have forces and levers.
Therefore, at the end of a member loaded with a "moment", you always have a force, which also implies a direction of application.

Please, see:
https://www.engineersedge.com/beam_bending/beam_bending35.htm

https://www.engineersedge.com/beam_bending/beam_bending51.htm

https://www.engineersedge.com/beam_bending/beam_bending51.htm

https://www.engineersedge.com/beam_bending/beam_bending55.htm

https://www.engineersedge.com/calculators/frame_deflections_concentrated_moment_14346.htm

https://www.engineersedge.com/calculators/frame_deflections_concentrated_moment_14346.htm

:cool:
 
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Lnewqban said:
in the real world, you only have forces and levers.
Sure, but in the diagram it is a twist around a vertical axis, so there is no shown lever to apply the force to.
I assume ABC and CDE are rigid elbows freely hinged to each other and to rod BD.
 

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