Given:

The Figure 2.6 represents the graph between true strain and true stress.

Concept used:

Write the expression for percentage elongation.

  E=(lf−lala)×100 .......... (1)

Here, E is percentage elongation, lf is fracture length and la is the initial length.

Calculation:

From Figure 2.6 the value of fracture strain and necking strain can be calculated but the original gage length cannot be calculated from Figure 2.6.

Equation (1) represented that elongation is function of the gage length, and gage length cannot be calculated from Figure 2.6. Therefore, the percentage elongations of materials cannot be calculated by Figure 2.6.

Conclusion:

Thus, the percentage elongations of materials cannot be calculated on the basis of Figure 2.6.