Engineering, 29.01.2020 02:41 pineapplequeen1912

You are using a strain gage connected to a wheatstone bridge (with battery of e = 5 v) to measure the force applied to a simple rectangular bar. the bar is 3 cm by 3 cm in cross section and stretched (along its length) from 0.3 m to 0.3002 m. assume a young's modulus of 69 gpa and a poisson's ratio of 0.3. a. calculate the axial stress. b. calculate the transverse strain (assume only stress applied is in line with the length) c. calculate the force applied d. you mounted two strain gages to the bar, but one has been rotated to be "inactive" (it serves as a temperature compensator, but it is sensitive to the transverse strain). the strain gages are in the same legs as problem 3 and balanced before strain (i. e., the output of the wheatstone bridge is 0 v in zero-strain conditions). both strain gages have a gage factor of 2 and all the nominal resistances are 120 n. what is the output voltage (ep) you measure taking the traverse strain calculated in problem 4b into account? hint: recall the equation for calculating the output voltage (ep) of the unbalanced wheatstone bridge (see lecture notes). then, consider resistance changes in r, and r4. to find the values ar, and ar4, use the definition e= ar/(fr). e. compare the voltage calculated in problem 4d to the one you would measure if you ignored the traverse strain contribution.

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You are using a strain gage connected to a wheatstone bridge (with battery of e = 5 v) to measure th...

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