A rod with a circular cross-section having a diameter of 3 cm and length 50 cm is produced using an age- hardneable Al-alloy. The E-modulus is 60 GPa. The ageing response after appropriate heat treatment is shown in figure 2. Yield strength [MPa] 350 325 300 275 250 225 200 175 150 125 100 1 10 100 1000 Time [s] 10000 100000 rm 1000000 340C --300C - 260C - 220C - 180C 140C I Figure 2. Yield strength as a function of time for ageing of an Al-alloy. Various ageing temperatures are shown. Q5. The rod is loaded in tension the longitudinal direction with a force of 200,000 N. The part is not allowed to deform plastically. Which of the ageing temperatures from Figure 2 can be used? (corroborate your answer) Q6. What is the elongation of the rod when loaded with a force of 200,000 N ?