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Fatigue test


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3 replies to this topic

#1 carlosEC

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Posted 11 June 2012 - 12:34 PM

Hello, I have been working on a fatigue test machine with my U3-HV, my only problem is that I need to detect when the cylinder completely deforms in order to stop the machine. I need a digital signal and I am not so sure about what sensor is the most recommendable for this case. Please some help would be great. Thanks.

#2 LabJack Support

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Posted 11 June 2012 - 03:58 PM

No direct experience with detecting cylinder deformation, but if there is not a sensor exactly for that the thing to think about is what happens when the cylinder deforms. Maybe some other effect occurs which you can easily measure.

#3 carlosEC

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Posted 11 June 2012 - 10:23 PM

No direct experience with detecting cylinder deformation, but if there is not a sensor exactly for that the thing to think about is what happens when the cylinder deforms. Maybe some other effect occurs which you can easily measure.


Is it possible to work with a strain gauge?? And using the analog input of the U3 comparing it with a constant in a vi? Would you recommend it? I want to be sure if it is going to work before buying the strain gauge.

#4 LabJack Support

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Posted 12 June 2012 - 08:16 AM

First you need to complete a bridge, so you need resistors or more strain gages:

https://forums.labja...?showtopic=4376

Once you have a bridge, you need an LJTick-InAmp to excite it and measure it with a U3.


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