Answer:
1) 75Mpa
2) 1.125 MPa
Explanation:
given data:
gauge length = 4 mm
displacement [tex]= 1.5\mu m = 1.5\times 10^{-3} m[/tex]
a) structural steel
Young modulus for steel is [tex]200 GPa = 200\times 10^3 MPa[/tex]
we know that
[tex]E =\frac{stress}{strain}[/tex]
[tex]Stress = 200\times 10^3 \times \frac{1.5\times 10^{-3}}{4}[/tex]
= 75Mpa
b) PMMA
Young's modulus [tex]= 3GPa = 3\times10^3 MPa[/tex]
[tex]stress = 3\times \frac{1.5\times10^{-3}}{4}[/tex]
stress = 1.125 MPa
