Strain Gauge Flashcards
What is strain
The effect of applied stress
What is the equation for stress
Force/ area
What does tensile strength do to a body
Increase the length of a body and by convention is positive
What does compressive stress do to a body
Decrease the length of a body and is conventional negative
What is the equation for strain
Sl/l
Sl- change in length
L- original length
What is elastic modulus
The slope of the stress vs strain curve
What is the equation for elastic modulus
E = stress/ strain
What is compliance
It relates the change in length to the applied force
What is the equation for compliance
Cm = sl/ F
Applied force is F
What does résistance of a strain gauge change with
Strain
What is the equation for resistance of a strain gauge
R= pl/A
A- cross sectional area
p- resistivity
l - strain gauge length
What is the equation for the gauge factor
GF = (sR/R)/(Sl/l)
What is poissons ratio
V = - (sd/d)/(sl/l)
