0.32 Strain at 67 MN/m2 0.27 --Strain at 79 MN/m2 Strain at 89 MN/m2 0.22 0.17 Strain (mm/mm) 0.12 0.07 0.02 0 1000 2000

[answerhappygod]

0 32 Strain At 67 Mn M2 0 27 Strain At 79 Mn M2 Strain At 89 Mn M2 0 22 0 17 Strain Mm Mm 0 12 0 07 0 02 0 1000 2000 1 (536.8 KiB) Viewed 10 times

Figure Q4, contains strain-time curves taken from samples of the
same composition at ambient temperature.
(i) Determine the stress exponent n. Include a graph in your
answer.
(ii) Which mechanism is predominant? Justify your answer.
(iii) Describe how this mechanism leads to rupture using
detailed and illustrated sketches.
(iv) Suggest and explain two approaches to improve the
resistance of this material to creep.
0.32 Strain at 67 MN/m2 0.27 --Strain at 79 MN/m2 Strain at 89 MN/m2 0.22 0.17 Strain (mm/mm) 0.12 0.07 0.02 0 1000 2000 3000 4000 5000 6000 7000 8000 -0.03 Time (h) Figure Q4. Strain-time curves for a metal.