Recap 1. The degree of closeness of the measured value of a certain quantity with its true value is known as a) Accuracy b) Precision c) Sensitivity 2.

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Presentation transcript:

Recap 1. The degree of closeness of the measured value of a certain quantity with its true value is known as a) Accuracy b) Precision c) Sensitivity 2. Error of measurment is a) True value- Measured value b)Precised value- True value c) Measured value - Precision

3 The ability by which a measuring device can detect small differences in the quantity being measured by it, is called its a) Damping b) Sensitivity c)Accuracy 4. The following is an internationally recognized and accepted unit system a) MKS b) FPS c)SI

Identify the iamge

MECHANICAL STRAIN GAUGE Wedge and screw magnification Simple mechanical lever magnification Compound magnification system 1. Berry strain gauge 2. The Tinius Olsen strain gauge Compound lever magnification 1. Huggenberger extensometer 2. Porter- Lipp strain gauge Magnification by rack and pinion Combined lever, rack and pinion magnification

Compound Lever Magnification It is classified into two categories a) Huggen berger strain gauge b) Porter Lipp strain gauge In this system magnification is composed of one or more levers in series

Porter- Lipp strain gauge

Description These type of gauges are very sensitive to any vibration that may occur in the structure under test. The natural frequency of these gauge is rather low The gauge length of this gauge is 25mm and magnification 300 Advantages: Compactness Extreme light weight Readings can be taken directly

HUGGENBERGER EXTENSOMETER

Description It consist of frame C which supports the lever system. a is a fixed contact point. b is a rhomb which is movable point Rhomb b is integral with arm h When there is change in length resulting in rotation of arm h and transmits through link d supported with knife edge m and n

-Contn The readings are noted in scale f are converted to actual strain using the multiplication factor Multiplication factor= l1 l2 /a1 a2 Spring is used to hold the points a and b in contact with test piece.

The magnification may vary from 300 to 2000 depending upon the model. The gauge length varies from 12.5 to 25 mm Advantages: Small size High magnification factor

Magnification by Rack and Pinion The rack and pinion principle with various types of gear trains is employed in this type. The dial indicator consist of gear train actuated by rack which follows the motion to be measured.

Dial gauge Indicator

Combined Lever, rack and pinion magnifaction

Description This type is a combination of lever and rack and pinion system. The Whitte more strain gauge is developed in 1928 The motion between two frame members is measured directly in dial indicators.

OPTICAL STRAIN GAUGE Marten’s mirror extensometer Tuckerman optical strain gauge

Marten’s mirror extensometer

Tuckerman optical strain gauge

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