Strain Gage question

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Caito
13
Joined: 16 Jun 2009, 05:30
Location: Switzerland

Strain Gage question

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Hi everyone!

I have a question regarding strain gages. For applications not requiring too much precision (10%), do you think it is a problem if you place a strain gage on top of the paint, instead of directly to the metal?

For example, in a coil spring which has been coated with some paint to protect it.


Thanks!!
Caito
Come back 747, we miss you!!

Greg Locock
233
Joined: 30 Jun 2012, 00:48

Re: Strain Gage question

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I reckon the installed, calibrated, cost of a strain gauge is about $100. Is it really worth risking that for the sake of a couple of minutes with emery paper? On the other hand if the paint is properly bonded to the metal then its like glue. And you glue the strain gage.

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CAEdevice
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Joined: 09 Jan 2014, 15:33
Location: Erba, Italy
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Re: Strain Gage question

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Caito wrote:
23 Oct 2017, 10:40
Hi everyone!

I have a question regarding strain gages. For applications not requiring too much precision (10%), do you think it is a problem if you place a strain gage on top of the paint, instead of directly to the metal?

For example, in a coil spring which has been coated with some paint to protect it.


Thanks!!
Caito
You could use a very large (long) strain gage, it will filter the median strain but if you don't need precision it could work.

Tommy Cookers
617
Joined: 17 Feb 2012, 16:55

Re: Strain Gage question

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install it and follow the response through time to a step loading and step unloading of the spring

Caito
13
Joined: 16 Jun 2009, 05:30
Location: Switzerland

Re: Strain Gage question

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Thanks all for your answers!

I'll evaluate and let you know. This is not for a dynamic application, that's why precision is not of importance.

We'll see how it goes :D
Come back 747, we miss you!!

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