Will our strain gauge accurately measure small forces on a baseball?

In summary, the experiment is looking to see if the baseball attached to a motor experiences small forces, and the strain gauge is not sensitive enough to measure them. They are looking to go with a more flexible support arm.
  • #1
CanoIsDbo
12
0
Hi, my group and I are doing an experiment on forces experienced on a baseball. Our setup involves the baseball attached to a motor, which is coupled to a cantilever beam (1/2 inch thick, 7 inch long aluminum rod). The beam has a strain gauge attached to it and we are recording data with labView. Our concern is with the sensitivity of the strain gauge. We don't believe we are going to get any forces greater then 3.5 ounces on the beam. Will the strain gauge measure the very very small deflection from such small forces?
 
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  • #2
I would expect that the data sheet for the device should indicate the sensitivity. If it doesn't register what you want, could you go with a more flexible support arm?
 
  • #3
Yes, we were thinking of possibly going with a plexiglass arm or some other type of plastic. Our concern with that is the weight of the motor (2 pounds) causing the beam to bend.
 
  • #4
Plastic is probably a bad idea. Metals give more reliable strain gauge readings, go for a thinner rod.
 
  • #5
It depends entirely on the gauge being used. You don't just grab one off the shelf and use it. A gauge is "sized" for the application.
 
  • #6
Good point, Fred. I didn't think of that.
 
  • #7
So, any recommendations of what type of strain gauge I need, sensitivity wise?

Thanks
 
  • #8
Depends on your expected deflection and how accurate you need to be. I'd ask a technician, or if you have someone how oversees and plans experiments ask them. Failing that you'll have to do some donkey work and read through strain gauge data sheets.

Its not something we can really answer properly because you'll defintely be able to get strain gauges that can read deflections in the 1/2 inch bar very accurately, they could be very expensive. Best bet is to look at what strain gauges are available to you, and design your experiement to fit them.
 
  • #9
And when in doubt, ask the manufacturer. They should be more than happy to advise you as to what unit will best suit your needs.
 

Related to Will our strain gauge accurately measure small forces on a baseball?

What is a strain gauge measurement?

A strain gauge measurement is a technique used to measure the amount of strain or deformation experienced by a material. It involves attaching a small device called a strain gauge to the material and measuring the changes in its electrical resistance as the material is subjected to external forces.

How does a strain gauge work?

Strain gauges work on the principle that the electrical resistance of a material changes when it is subjected to mechanical stress. The strain gauge is made up of a thin wire or foil that is attached to the material. As the material stretches or compresses, the length of the wire changes, causing a change in its electrical resistance. This change is then measured and used to calculate the strain on the material.

What are the advantages of using strain gauge measurement?

There are several advantages to using strain gauge measurement. It is a non-intrusive method, meaning that it does not alter the properties of the material being measured. It is also highly sensitive and can detect very small changes in strain. Additionally, it is a relatively inexpensive and easy method to use, making it a popular choice for many applications.

What are the limitations of strain gauge measurement?

While strain gauge measurement has many advantages, it also has some limitations. The accuracy of the measurement can be affected by external factors such as temperature and humidity, which can cause changes in the electrical resistance of the material. Additionally, the strain gauge must be properly installed and calibrated, and the material being measured must have a linear response to stress for accurate results.

What are some common applications of strain gauge measurement?

Strain gauge measurement is used in a wide range of applications, including structural engineering, aerospace and automotive industries, and biomechanics. It can be used to measure the strain on bridges, buildings, and other structures to ensure their safety and stability. In the automotive industry, it is used to measure the strain on vehicle components and to improve their design. In biomechanics, it is used to study the strain on bones and muscles during movement.

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