Data acquisition for calculating fatigue life
Data acquisition for calculating fatigue life
(OP)
Hi,
I need to carry out a fatigue life analysis on an automobile seat and would like to know how I can measure the stress amplitudes it is subjected to. I guess an accelerometer would need to be used but am not sure which would be the cheapest way to record the data. Can anyone give share their experiences with data recording for the calculation of fatigue life or suggest a suitable technique to do so.
Thanks,
David
I need to carry out a fatigue life analysis on an automobile seat and would like to know how I can measure the stress amplitudes it is subjected to. I guess an accelerometer would need to be used but am not sure which would be the cheapest way to record the data. Can anyone give share their experiences with data recording for the calculation of fatigue life or suggest a suitable technique to do so.
Thanks,
David





RE: Data acquisition for calculating fatigue life
Can you not justify maesuring strains, or forces, directly?
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Data acquisition for calculating fatigue life
i presume that you want to measure the applied load so you can investigate your whole seat ... if you have a key details that you're interested in, strain guages would collect the targeted information (in my business we'll often collect both applied load and local stresses, usually this only leads to endless argruments over why the model doesn't match reality !)
RE: Data acquisition for calculating fatigue life
http://iotech.com/
I agree with Greg that an accelerometer is not best suited to this purpose. Strain gauges can be relatively inexpensive. Vishay is the leader in this area:
http://www.vishay.com/strain-gages/
Vishay also make data acq systems that compete with IOtech.
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Data acquisition for calculating fatigue life
-Reidh
RE: Data acquisition for calculating fatigue life
Thanks,
David
RE: Data acquisition for calculating fatigue life
i don't think these systems provide the active control you're looking for ... that would be a separate controller.