They consist of a pattern of resistive foil which is mounted on a backing material.. The red crosshairs move on the scale as the crack widens 11 ELECTRICAL STRAIN GAUGE • When an electrical wire is stretched within the limits of its elasticity such that it does not break or permanently deform, it will become narrower and longer, changes that increase its electrical resistance end- to-end. • 1952 : At this time, printed circuits were emerging, and Saunders-Roe developed the idea of making a strain gauge by etching the pattern for the gauge from a thin foil. 5 STRUCTURE • The majority of strain gauges are foil types, available in a wide choice of shapes and sizes to suit a variety of applications. Free Disk Catalog Software Mac
TYPES Based on construction : • Foil strain gauge • Semiconductor strain gauge • Photoelectric Strain gauge 10.. DEFINITION • A strain gauge is an example of passive transducer that converts a mechanical displacement into a change of resistance.. One layer is glued to one side of the crack and one layer to the other As the crack opens, the layers slide very slowly past one another and the pointer moves over the scale. Lync 2013 For Mac
• A strain gauge is a thin, wafer-like device that can be attached to a variety of materials to measure applied strain.. 6 WORKING • The strain gauge is connected into a Wheatstone Bridge circuit The change in resistance is proportional to applied strain and is measured with Wheatstone bridge.. Strain can be calculated from voltage Piezoelectric strain gauges are the most sensitive and reliable devices.. • Early 1930s : Charles Kearns made the first notable use of bonded resistance strain gauges to measure vibratory strains in high performance propeller blades.. 13 BONDED STRAIN GAUGE • A bonded strain-gage element, consisting of a metallic wire, etched foil, vacuum-deposited film, or semiconductor bar, is cemented to the strained surface.. MECHANICAL STRAIN GAUGE • It is made up of two separate plastic layers The bottom layer has a ruled scale on it and the top layer has a red arrow or pointer.. var q = 'crack+gauge+manufactuers'; 1 STRAIN GAUGE PRESENTATION BY: 2 CONTENTS • Definition • History • Working • Characteristics • Types • Advantages • Disadvantages • Application 3.. • Strain can be inferred by measuring change in resistance 12 PIEZOELECTRIC STRAIN GAUGE • Piezoelectric generate electric voltage when strain is applied over it.. • They operate on the principle that as the foil is subjected to stress, the resistance of the foil changes in a defined way.. 7 WORKING • The sensitivity of a strain gauge is described in terms of a characteristic called the gauge factor, defined as unit change in resistance per unit change in length, or • Gauge factor is related to Poisson's ratio µ by, K=1+2 µ 8. 34bbb28f04 Free download Freedom Fighter Game Download last version
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