Mechanical Extensometer
is an attachment to Universal / Tensile Testing Machines. It
measures the elongation of a test piece on load for the set
gauge length. The least count of measurement is 0. 0 1 mm and
maximum elongation measured is upto 3 mm. This elongation measurement
helps in finding out the Proof Stress at the required elogation
percentage.
Working principle
The required gauge length (between 30 to 120 mm) is to be set
by adjusting the upper knife edges on the scales.
Hold the test specimen in the upper and lower jaws of Universal
/ Tensile Testing Machine.
Position the Extensometer on the specimen. Position upper clamp
to press upper knife on the specimen.
The extensometer will now be fixed to the specimen by spring
pressure. Set zero on both the dial gauges.
Start loading the test specimen and take the readings of load
on the machine of required elongation or the elongation at required
load
For better accuracies mean of both the dial gauge readings should
be taken as elongation
MATERIAL TESTING EQUIPMENTS 