Strain Gauge

Strain Gauge

Strain Gauge sensor transducer Strain Gauge (stain) 3 1 , 2 4 Strain Gauge quarter, half full bridge (strain) (Stress)

Strain Gauge

Strain Gauge (Passive Transducer) (Strain) Strain Gauge , , (Displacement)

Strain Gauge 2 (Bonded Strain Gauge) (Unbounded Strain Gauge) Strain Gauge

Strain Gauge

= Strain Gauge ( )

=

( )

=

( )

=

()1. (Hooke) (Stress) (Strain) (Stress)

=

(N/m2)

=

(N)

=

(m2)

(Hookes law) (Modulus of Elasticity) (Young Modulus)

E = (N/m2)

=

(N/m2)

= - (Deformation) (tensile stress) (compressive stress) (normal strain ) ( ) ( Lo )

(axial strain ) (transverse strain ) (Poissons ratio )

(stress-strain diagram) (tension test) 4

4 (elastic deformation) (Hookes law)

E (Youngs modulus) (modulus of elasticity)

(plastic deformation) (yield stress ) (yielding) (ultimate tensile stress ) (necking) (breaking) (breaking stress )

2. (Wheatstone bridge)

1 1

(1) ( R1R3 = R2R4 ) Strain gauge (1)

(2) (R=R1=R2=R3=R4) (2)

(3)1. (Strain Gauge) 2. (load) (bending moment) (strain) (deflection) (cantilever beam)

3. 4.1. (Strain gauges) 2. 500,1000,2000 3000 500 2 1000 23. A1, D1 A2, D2 A2D1, A2D2 D1D2

4. 1 2 4 5. Strain gauges Reader (Strain)

1. strain gauge (reader)2. 500 2 1000 2 3. 500,1000,2000 3000 4. 1 1 A1, A2, D1 D25. (Strain) Strain gauges Reader 6. 2 2 A1D1, A2D2, D1D2 A1A27. (Strain) Strain gauges Reader 8. 3 4 A1, A2, D1, D29. (Strain) Strain gauges Reader

1. 1 gauge quarter bridge

3 3 quarter bridge (1 ) , half bridge (2 ) full bridge (4 ) () = - (load) (cantilever beam) (bending moment) (strain) (deflection) quarter bridge half bridge quarter bridge full bridge

The Cantiliver Beam

(1)

;

F(L-x) - = 0

= F(L-x) (2)

From (1),(2)

( 3)

(3) x x Cantiliver Beam

Mechanical Engineering, Faculty of Engineering

Khon Kaen University

Subject: 185390Mechanical Experiments I

Experiment: Force MeasurementRoom: EN710K

Group:M7Section: 1

1. Code 553040033-2

2. Code 553040133-8

3. Code 563040300-6

4. Code 553040436-0

5. Code

6. Code

Instructor..

Experiment Date: 8 2557Time: 13.00 . - 17.00 .

Submit: 15 2557Time:13.00 .at 13.15 .

Comment

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