Question

3. A 2.8 cm x 5.0 cm rectangular rod is stretched from its initial length of 0.4000 m to a length of 0.4005 m. The Young’s modulus of the rod material is 95 GPa. Poisson’s ratio of the rod material is 0.333.

A) Calculate the axial stress in units of MPa

B) Calculate the transverse strain in units of microstrain

C) A strain gauge with a strain gauge factor of 2.1 is glued to the rod before it is stretched, aligned with the direction of stretching. A quarter bridge Wheatstone bridge circuit is constructed, with the strain gauge as resistor R1. Assume all resistors are equal when the strain gauge circuit is initially balanced before the rod is stretched. The strain gauge is balanced before the rod is stretched. The bridge supply voltage is 7.5V. Calculate the output voltage (in mV) of the bridge after the rod is stretched

Ri R2 V, O T R4 Rs

Answer 1

get data for ro 1s 1) ヒ 0,2,2 a - -4.(667 x10

K, supply Vottage. Value 2