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GR&R for an "R" value instrument installed on my 10K Horizontal Tester

S

Sukamu

#1
I am required to do GR&R on an "R" value instrument installed on my 10K Horizontal Tester, not sure quite how to set up the testing, does anyone do this for automotive Big 3?
 
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Miner

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#3
Re: GR&R for an "R" value instrument

More information about the tester would be helpful. What is it and what does it test?
 
S

Sukamu

#4
Re: GR&R for an "R" value instrument

Instron 10K Vertical Tensile Tester, testing for Yield, Tensile, and Elongation, and now R and N values.
 

Miner

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#5
Re: GR&R for an "R" value instrument

R should be straight forward as it is a ratio calculated from four dimensional measures (two before and two after).

Have your operator(s) measure the samples multiple times before the test then again multiple times after the test. Next calculate R using the matched before/after results. That is, the two dimensions from sample 1, first repeat before and the two dimensions from sample 1 first repeat after.

While the test itself is destructive, the dimensions are not destructive. However, you must plan the before measurements and take them before performing the test.

I'll have to research on N before advising how to do that. Does the Instron software calculate N directly, or do you interpret it from a graph?
 
Last edited:
K

krayworth

#6
Re: GR&R for an "R" value instrument

Transverse strain needs to be measured to determine the r-value, or the plastic strain ratio. Depending on which software you're using, r-value can be calculated automatically. The machine also needs to be equipped with a strain measurement device to measure the transverse strain and the controller's transverse strain channel needs to be activated.
 
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