Astrain gauge with a 4 mm gauge length gives a displacement reading of 1.5 um. calculate the stress at the location of the strain gauge if the material is a) structural steel, and b) pmma.

1)  75Mpa

2) 1.125 MPa

Explanation:

given data:

gauge length = 4 mm

displacement

a) structural steel

Young modulus for steel is

we know that

          = 75Mpa

b) PMMA

Young's modulus

stress = 1.125 MPa

answer:

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explanation: