Orientation of Strain gauge

1. GOVERNMENT ENGINEERING COLLEGE
PALANPUR
MECHANICAL DEPARTMENT
ORIENTATION OF STRAIN GAUGES FOR FORCE AND
TORQUE, STRAIN GAUGE BASED LOAD CELLS AND
TORQUE
SUB :- MECHANICAL MEASUREMENT AND METROLOGY
PREPARED BY:-JIGAR PRAJAPATI-220613119010
ROHIT PRAJAPATI-220613119011
GUIDED BY: PROF B.D.PRAJAPATI
SIR

2.  BASICS OF STRAIN GAUGE
 A strain gauge is a sensor whose measured
electrical resistance varies with changes in
strain.
 A strain gauge is a resistor used to measure
strain on an object.
 When an external force is applied on an object,
due to which there is a deformation occurs in
the shape of the object.
 This deformation in the shape is both
compressive or tensile is called strain, and it is
measured by the strain gauge

4.  ORIENTATION OF STRAIN GAUGES
 The orientation of strain gauges is an important factor in determining the
accuracy and sensitivity of the measurements.
 Strain gauges are usually installed on a test specimen to measure the strain
that occurs due to an applied force or deformation.
 The orientation of the strain gauge depends on the direction of the strain that
is to be measured.
 The two most common orientations for strain gauges are:
1. Axial orientation
2. Transverse orientation

5. 1. AXIAL ORIENTATION
 The strain gauge is bonded
parallel to the longitudinal axis
of the test specimen.
 This orientation is suitable for
measuring axial strains.
 I.E. The strains that occur along
the direction of the applied
force or deformation.

6. 2. TRANSVERSE ORIENTATION
 The strain gauge is bonded
perpendicular to the longitudinal axis
of the test specimen.
 The orientation is suitable for
measuring transverse strains.
 I.E. The strain that occur
perpendicular to the direction of the
applied force or deformation.

7.  The orientation of the strain gauge is also influenced by the type of
strain that is to be measured.
 For example, if the test specimen undergoes shear deformation, the
strain gauge should be installed at a 45- degree angle to the direction
of the applied force or deformation.
 It is essential to follow the manufactures guidelines for the orientation of
strain gauges to ensure accurate and reliable measurements.
 Incorrect orientation can result in reduced sensitivity and errors in the
measurement.
 Therefore, it is essential to choose the appropriate orientation based on
type of strain and the direction of the applied force or deformation.
 ORIENTATION OF STRAIN GAUGES

8.  Strain gauges are commonly used in force and torque measurements,
and their orientation plays a crucial role in the accuracy of the
measurement.
 Here are some guidelines for orientation of strain gauges in different
applications:
1. Force measurement
2. Torque measurement
3. Strain gauge based load cells
4. Strain gauge based torque sensors
 ORIENTATION OF STRAIN GAUGES

9.  The strain gauge is usually bonded to
a metal beam or a load cell that
deforms under the applied force.
 The strain gauge should be bonded
perpendicular to the direction of
force. It is called transverse
orientation type measurement.
 I.E. The longitudinal axis of the beam
or the load cell
 This orientation maximizes the
sensitivity of the strain gauge to the
deformation caused by the force.
1. FORCE MEASUREMENT

10.  The strain gauge is usually bonded
to a torsion bar or a torque sensor
that twists under the applied
torque.
 The strain gauge should be bonded
parallel to the direction of torque. It
is called axial orientation type
measurement.
 I.E. Along the axis of the torsion
bar.
 This orientation maximizes the
sensitivity of the strain gauge to
the torsion caused by the torque.
2. TORQUE MEASUREMENT

11.  A load cell is a device that converts
the applied force into electrical
signal that can be measured.
 The strain gauge load cell is an
electro-mechanical transducer
which translates change in force
into change in voltage.
 Load cells typically use multiple
strain gauges bonded in a
Wheatstone bridge configuration.
 The strain gauges should be
oriented perpendicular to the
direction Of force.
3. STRAIN GAUGE-BASED LOAD CELLS

12.  Load cell is small and compact in size.
 Accuracy is very good
 Fast response against load variations.
 It has good sensitivity.
 It can be measured compressive as well as tensile load.
 ADVANTAGES OF STRAIN GAUGE LOAD
CELLS

13.  A torque sensor is a device that
converts the applied torque into an
electrical signal that can be
measured.
 Torque sensors also use multiple
strain gauges bonded in a
wheatstone bridge configuration.
 The strain gauges should be
oriented parallel to the direction of
torque.
4. STRAIN GAUGE-BASED TORQUE
SENSORS

14.  https://youtu.be/cJUxvqot3pU

15. THANK YOU