Mechanical Engineering, Faculty of Engineering Khon Kaen University Subject: 185390Mechanical Experiments I Experiment: Force Measurement Room: EN710K Group: M7 Section: 1 1.นนนนนนนนนน นนนนนนนนนน Code 553040033-2 2.นนนนนนนนนน นนนนนน Code 553040133-8 3.นนนนนนน นนนนนนนนนนน Code 563040300-6 นนนนนนนน นนนนน นนนนน นนนนนนนนนนนน /3 นนนนนนนนนนนนนนนนนนนนนน /3 นนนนนนนนนนนนนนนนน /5 นนนนนนนนนนนนนนนนนนน /6 นนนนนนนนนนน นนนนนน นนน นนนน /3 นนนนน: Comment ………………………………………………….. นนนนนนนนนนนนนน
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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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