Please can you help me with the attached question? The wire on a strain gauge has resistivity0.015 × 106 Qm and gauge factor 2.0, and isattached to an aluminium sample experiencing a strainof 0.008. The wire is 5 mm long and 0.25 mm indiameter. What change in resistance will be detected inthe wire?Give your answer in Q to 3 significant figures.(Very small values may be input in decimal or scientificnotation. For example, 1.23 × 10-4 can be input as0.000123 or 1.23*10^-4.)

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Answered: The wire on a strain gauge has…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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This question from measurements instrumentation course. The pic two is for figure 8.20(a).
A strain gauge is used to measure the tension force in a 1-in. diameter bar of steel (E = 30, 000, 000 lb/ in?). The strain gauge has a nominal resistance of 140 N and a gauge factor (GF) of 4. The strain gauge is connected to a bridge (which is supplied with 10 Vdc). The bridge was initially balanced. After the bar is put under tension, the bridge output voltage goes to 0.0008 Vdc. Draw a schematic of the setup and calculate the force.
A metallic strain gauge produces an electrical resistance change when subjected to mechanical strain. However, engineers don't measure this voltage drop directly using a voltmeter. Why don't we directly measure the voltage drop across the strain gauge, and instead, use a Wheatstone Bridge? Damgraph >
i. If you know that any strain gauge has a sensitivity towards temperature.In other words, any change in the temperature could also affect theresistance value. How can we get a correct reading from strain gaugesand get rid of the temperature effect?ii. In an AC LVDT system, measuring the output voltage alone gives anindication of the displacement from the center, but not the direction ofdisplacement. Explain why, and also explain a method for solving thisproblem.iii. In a vortex flow meter, there are many methods that could be used tomeasure the effect of vortices and measure the flow rate. Explain howvortices could occur in this flow meter, and explain three methods thatcould be used for measuring the effects of vortices in a vortex flowmeter.iv. Explain in details how can we use a capacitor to indicate the lever ofwater in a tank (use drawings and electrical diagram to elaborate on yourexplanation).Page 5 of 63v. Bimetallic strip could be used as a temperature detector. Explain…
650 600 550 500 450 400 350 300 250 200 150 100 50 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.02 Strain mm/mm The graph above shows the stress-strain relationship of a steel bar under tension test. The steel bar diameter = 8 mm and the bar gauge length = 100 mm. Determine the following: If the specimen is loaded to 550 MPa and then unloaded. What would be the modulus of resilience of the sample after reloading? Stress (MPa)
The following data was obtained as a result of tensile testing of a standard 0.505 inch diameter test specimen of magnesium. After fracture, the gage length is 2.245 inch and the diameter is 0.466 inch. a). Calculate the engineering stress and strain values to fill in the blank boxes and plot the data. Load(lb) Gage Length (in) Stress (kpsi) Strain 0 2 1000 2.00154 2000 2.00308 3000 2.00462 4000 2.00615 5000 2.00769 5500 2.014 6000 2.05 6200 (max) 2.13 6000 (fracture) 2.255 b). Calculate the modulus of elasticity c). If another identical sample of the same material is pulled only to 6000 pounds and is unloaded from there, determine the gage length of the sample after unloading.
640 480 160 0.002 0,004 0.006 0.008 0.010 Strain (mm/mm) A tensile test specimen of Aluminum alloy having a gauge length of 280 mm was tested to fracture. Stress and strain data obtained during the test are shown in the attached Figure. **Answers are approximate - do your best to read the graph. Determine: (a) the modulus of elasticity in GPa (4sigs). Enter this value into D2L answer box. (b) the proportional limit in MPa (3sigs). (c) the ultimate strength in MPa (3sigs). (d) Ductility of material based on percent elongation. (3sigs) Your Answer: Stress (MPa)
1) A compressive force is applied to a structural member. Two separate strain gauges are attached to the structural member; one is a nickel wire strain gauge having a gauge factor of -12.1 and the other is nichrome wire strain gauge having a gauge factor of 2. Calculate the value of resistance of the two gauges after they are strained, if the resistance of strain gauges before being strained is 120 2, and the compressive strain is 5 micro-strain. Assume positive value for tensile strain and negative for compressive strain. (Answer: For Nickel, R = 120.00726 Q. For Nichrome, R = 119.9988 Q)
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