Answer Happy

Creep Data for all Sections Test Temperature 297 K Gauge Length (Original Length) 14.4625mm Specimen cross-sectional area (mm) 9.8 mm Q (activation energy for lead) 125,000 J/mole R (Gas constant) 8.31 J/mole-K Applied stress (Load x 8x 9.8) /Area 1.3 kg AL (mm) 1.2 kg AL (mm) 3.45 3.9 4.2 4.5 3.75 4.59 4.815 5.01 5.2 5.4 1.4 kg AL (mm) 4.35 5.325 5.73 6.18 6.84 7.755 11.34 13.4 4.65 4.68 I: 5.7 Load on Hanger Time (min) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 6 6.3 6.6 6.9 7.3 7.74 8.505 9.525 11.13 曾同區區區區 區區區區區區區區區區區官 | 度 1.0 kg AL (mm) 2.7 3.15 3.225 3.3 3.345 3.39 3.435 3.51 3.525 3.54 3.57 3.6 3.615 3.645 3.675 3.72 3.735 3.75 3.78 3.795 3.84 3.855 3.885 3.9 3.915 3.93 3.945 3.96 3.96 3.975 3.99 4.005 4.02 4.035 4.05 4.065 4.08 4.095 4.71 4.74 4.785 4.83 4.89 4.98 5.07 5.205 5.325 5.475 5.625 5.805 5.985 6.18 6.375 6.57 6.765 6.96 7.155 7.35 7.575 7.8 7.95 8.145 8.25 52 54 8.4 64 66 8.625 8.85 9.075 9.36 9.675 10.05 70 72 74
10.5 11.25 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 而四四四四四四四四四 4.11 4.125 4.155 4.2 4.275 4.35 4.47 4.62 4.8 4.965 5.175 5.385 5.7 6 6.75 7.5 8.7 10.5 12.45 108 110 112 1. For each load, calculate the strain (AL/L) in tabular form. Then plot a cur the strain for each load against the time (ie Strain on Y-axis and time on - axis). You will have four (4) curves. (4 marks) 2. Determine the creep rate(= 4/AT) by determining the slope of the secondary creep region. You will have four (4) creep rates (one for each curve) (2 mark) 3. Determine also the rupture time during each applied load (1 marks) 4. Calculate the stress for the four different loads and then fill the table below (2 marks) Stress Load (kg) Temp (K) (Load*8*9.8/Area) Creep rates Rupture time (min) 1 297 1.2 297 1.3 297 1.4 297 5. Plot the creep rate on Y-axis and stress on X-axis. Fit the curve with a power trendline and relate the equation of the trendline with the one below(2 marks): = Bot Determine B and n. 6. If A = exp(-Q/RT) and B =KA, then find K (=B/A)