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Factors affecting accuracy of strain gauges?
Temperature Variation - This can be one of the major causes of error in a strain gauge. It can easily change the gauge resistance and cause differential expansion between the gauge and the test piece, causing variation in the measurable strain.Humidity - Humidity can affect the accuracy by the breakdown of insulation between the gauge and the ground point. It also causes electro-chemical corrosion of gauge wire due to electrolysis.Small errors could be caused due to thermoelectric effect.The gauge will be erroneous even due to small factors like zero drift, hysteresis effect and so on.Magnetostrictive effect can also cause errors in strain gauges of ferromagnetic materials. It produces a small voltage fluctuation of almost 2 mill volts.
What are the sensors used in weighing machines sensors?
strain gauges .
What is the unit for strain?
dont think strain has any units
Difference between simple shear strain and pure shear strain of fabric?
no
Why stres is directly proportional to strain?
Yeah, according to the Hooke's law of elasticity,the stress is proportional to the strain within elastic limit that is Stress ∝ Strain or Stress/Strain = constant. [The constant of proportionality is called as "modulus of elasticity" or "coefficient of elasticity".]
Factors affecting accuracy of strain gauges?
Temperature Variation - This can be one of the major causes of error in a strain gauge. It can easily change the gauge resistance and cause differential expansion between the gauge and the test piece, causing variation in the measurable strain.Humidity - Humidity can affect the accuracy by the breakdown of insulation between the gauge and the ground point. It also causes electro-chemical corrosion of gauge wire due to electrolysis.Small errors could be caused due to thermoelectric effect.The gauge will be erroneous even due to small factors like zero drift, hysteresis effect and so on.Magnetostrictive effect can also cause errors in strain gauges of ferromagnetic materials. It produces a small voltage fluctuation of almost 2 mill volts.
Difference between unbonded strain gauge and bonded strain gauge?
The essential difference is that the bonded strain gauges are bonded on to the specimen whose strain is being measured whereas the unbonded strain gauges are not bonded on to the specimen. As the bonded strain gauges are well bonded on to the specimen, the entire strain being experienced by the specimen is transferred to the strain gauge. However, the bonded strain gauges are affected by temperature changes and also due to transverse strains.For transverse strains and ambient temperature compensations, suitable circuits for compensation can be used using Wheatstone's bridge. The unbonded strain gauges cannot transfer the strain of the specimen to the strain gauge and hence it is used mainly for displacement, or pressure or force transducers. It is least affected by transverse strain and temperature compensation of unbonded gauges cis automatically eliminated using Wheatstone's bridge.
Describe metallic bonded strain gauges?
metallic bonded strain gauge
What are the advantages and disadvantages of mechanical strain gauges?
Babalo
What is the purpose of a strain gauge?
A strain gauge is used to measure the strain of an object. It was invented by the inventors Edward Simmons and Arthur Ruge in 1938. There are several types of gauges (metallic, capacitance, photo-electrics and semiconductor gauges).
What are the sensors used in weighing machines sensors?
strain gauges .
How do you calibrate strain gauges?
The strain gage indicates strain, and the stress is from Hooke's law; stress = modulus times strain so you need to know the modulus of elasticity
Where is constantan used?
In many typical installations, it is used in strain gauges.
What is the inductance of Mechanical strain gauge?
"Mechanical Strain gauges" do not have inductance. There are many types of strain gauge: Mechanical, photoelastic, electrical etc.... Are you wanting the inductance of an electrical strain gauge? if so which type?
What has the author John Yarnell written?
John Yarnell has written: 'Resistance strain gauges'
What is the example of zero order instrument?
Wire strain gauges are an example for a zero order instrument.
Why are semiconductor strain gauges more sensitive than metal strain gauges?
Semi-conducting materials changes in inter-atomic spacing resulting from strain affect the band gaps, making it easier for electrons to be raised into the conduction band while in metals, resistance change is mostly due to the change of geometry resulting from applied mechanical stress.
