Question

This task related to destructive and non-destructive test methods that can be used to identify properties of metal and non-metals, and compare and contrast theoretical given values with the practical data give.

a. Figure 11 shows results/ observation of several tensile tests performed. Compare and contrast theoretical material properties: modules of elasticity (205GPa), yield stress (300MPa) and ultimate tensile stress (500MPa) of metal (ferrite stainless steels Grade 409) of the specimens 1 and specimen 16 shown in Figure 11(Left) and using the destructive tensile test results in the graph (Figure 11-Right) for relevant specimens.

Answer 1

Theoretical given

$E= 205GPa\\ S_{yt}= 300 MPa\\ S_{ut}= 500 MPa\\$

Practical elasticity

Modulus of elasticity =Slope of the curve

$\implies \frac{350-0}{\frac{0.03}{100}-0}\\ F= \frac{11666.66}{10^{-2}}= 1166.66 GPa$

Yield stress is 350 MPa and ultimate stress is 475 MPa  from the graph

Specimen 1

Theoretical given

$E= 205GPa\\ S_{yt}= 300 MPa\\ S_{ut}= 500 MPa\\$

Practical results

The slope is the same for all curves, $E=1166.66 GPa$

Yield stress is 350 MPa and ultimate stress is 400 MPa  from the graph