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Practical No: 02 Tension test on mild steel as per IS:432(1). Observations and calculations: 1. Original Diameter Measurement ● Measured Diameters: ○ Diameter1 = 12.10 mm ○ Diameter2 = 12.15 mm ○ Diameter3 = 12.05 mm ● Original Diameter (Average): d=12.10+12.15+12.053=36.303=12.10 mmd = \frac{12.10 + 12.15 + 12.05}{3} = \frac{36.30}{3} = 12.10 \text{ mm}d=312.10+12.15+12.05=336.30=12.10 mm ● Cross-Sectional Area (A): A=π4×(12.10)2=3.14164×146.41≈114.92 mm2A = \frac{\pi}{4} \times (12.10)^2 = \frac{3.1416}{4} \times 146.41 \approx 114.92 \text{ mm}^2A=4π×(12.10)2=43.1416×146.41≈114.92 mm2 2. Original Gauge Length (g) ● Gauge Length: g=5.65×A=5.65×114.92≈5.65×10.72≈60.56 mmg = 5.65 \times \sqrt{A} = 5.65 \times \sqrt{114.92} \approx 5.65 \times 10.72 \approx 60.56 \text{ mm}g=5.65×A=5.65×114.92≈5.65×10.72≈60.56 mm 3. Gauge Length of Extensometer ● Extensometer Gauge Length: 50 mm (assumed for demonstration) 4. Least Count of Extensometer (L.C) ● Least Count: 0.01 mm Summary of Calculations ● a] Original Diameter (d): 12.10 mm ● b] Cross-Sectional Area (A): 114.92 mm2 ● c] Original Gauge Length (g): 60.56 mm ● d] Gauge Length of Extensometer: 50 mm ● e] Least Count of Extensometer (L.C): 0.01 mm Practicalkida.com
Calculation table: Final Gauge Length (g'): g′=65.20 mmg' = 65.20 \text{ mm}g′=65.20 mm Reduced Diameter (d'): d′=9.80 mmd' = 9.80 \text{ mm}d′=9.80 mm Calculations: Practicalkida.com
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