Will strain resistance will go up

[A2]

I have a strain gauge of 1000ohm, with 50000 microstarin & GF=2 it can exhibit a change of 100ohms.

Do strain resistance value will always go down i.e 1000-100 = 900ohms.
or it can go above 1000 ohms. Like 1000+100 = 1100ohms

[fcb]

Depends on the direction of the strain.  One way it's resistance will increase - the other it will decrease.  1000ohms is the nominal value.

[A2]

1. I am using strain gauge from vishay whose datasheet i have attached.

2. I know that in compression resistance decrease & vice versa.

3. But in datasheet it says only, strain range = 5%. For gf = 2 & R = 1K, total change in resistance will be 100ohms.

Now does that resistance will go 100 ohm down(i.e 900ohm) in case of compression
& in case of tension it will go up 100 ohm (i.e 1100 ohm) to show maximum strain i.e
5% or 50000 microstrain


This is what i am asking?

[f5r5e5d]

most things I've see strain gages glued to don't do  +/-5% strain - or at least not twice

for good force measurement you usually use a metal structure in its linear elastic recovery range, which is less than 0.5% strain

and most measuring devices are used with a safety factor to not permanently bend the completed load cell

so you most often end up with less than 0.1% resistance change

of course if you are into destructive testing/plastic deformation you may see more

[fcb]

Read: http://www.vishaypg.com/docs/11506/gageser.pdf

Whilst +/-5% is the limit, I would be nervous about subjecting a strain gauge to a tenth of that (and maintaining any sort of accuracy), I think the adhesives would also be a problem.

And in answer to your (specific) question: yes