Why we have to tap the frame during Deflection of Beam Experiment?

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SUMMARY

The discussion centers on the necessity of tapping the frame during the deflection measurement of simply supported beams in a physics experiment. Participants highlight that this action addresses "stiction," a term used to describe the static friction that prevents movement between measurements. The tapping helps to ensure accurate readings by overcoming any forces that may hinder the beam's deflection response. Understanding this concept is crucial for interpreting experimental results accurately.

PREREQUISITES
  • Basic understanding of beam mechanics and deflection principles.
  • Familiarity with static and dynamic friction concepts.
  • Knowledge of experimental protocols in physics labs.
  • Awareness of mechanical indicating devices and their operation.
NEXT STEPS
  • Research the concept of "stiction" and its implications in mechanical systems.
  • Study the principles of static and dynamic friction in engineering applications.
  • Learn about the setup and measurement techniques for beam deflection experiments.
  • Explore the use of mechanical indicating devices and their calibration methods.
USEFUL FOR

Physics students, engineering students, and laboratory technicians involved in experimental mechanics and deflection analysis will benefit from this discussion.

socrates_1
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hi, last week we did an experiment to find the deflection of simply supported beams.
During the experiment, after every measurement we had to tap the frame slightly. Does anyone know why we had to do this?
If you could explain it to me I would be grateful.
 
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Firstly some protocol. You have posted duplicate threads. This is frowned upon, to put it mildly.

As to your question, did you not ask the lecturer at the time?.

If I were she I would have suggested you consider what force or forces might be acting that are not included in the general beam formulae you were testing.
 
Thank you for your response.
I can't find out what forces u mean. Could you explain it further?
 
Since you were measuring deflections, something probably moved between each measurement. What sort of force tends to prevent things from moving, in any real-world situation?
 
AlephZero said:
Since you were measuring deflections, something probably moved between each measurement. What sort of force tends to prevent things from moving, in any real-world situation?

Friction?
 
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To set up the experiment you would of got some sort of beam and Clamped one end or both. The key word in there starts with a C.
 
Could someone else explain??I can't find out
 
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I just gave you the answer without actually telling you. Straight just telling you the answer is frowned upon here.
 
anyone who could actually tell me?
 
  • #10
socrates_1

Friction?

Many engineers call it "stiction". It is the same reason that we tap any mechanical indicating device that relies on mechanical movement to indicate a value, such as a meter movement a dial gauge, a barometer etc.

http://en.wikipedia.org/wiki/Stiction
 
  • #11
Studiot said:
Many engineers call it "stiction". It is the same reason that we tap any mechanical indicating device that relies on mechanical movement to indicate a value, such as a meter movement a dial gauge, a barometer etc.

http://en.wikipedia.org/wiki/Stiction

really thank you
 

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