In Reply to: Welcome! posted by Winston Sun on 06/20/00 at 3:34 AM:
Here is the first question... hope someone can give me some insight about how
to explain this phenomenon.
Lifting of p-type polysilicon beams with resistance R (using probes) has been proved
experimentally to cause increase in longitudinal resistance DR. From structural mechanics
textbooks the upper beam fibers are in compression and the lower ones in tension. Their
magnitudes are exactly the same but opposite in signs. Therefore the net strain, e, is zero
as a result. However from the gauge factor equation we know that DR/R=G*e, how can we
get a theoretical change in resistance if the net strain is zero?
Please help... any pointers would be mostly appreciated. Thanks in advance!