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Practical No: 04 Compression test on any two metals like Mild Steel, Brass, Al etc. using Compression Testing Machine Observations and Calculations Sr. No. Specime n Dimension s (mm) Cross-Sectio nal Area (mm2) Failure Load (N) Compressive Strength (N/mm2) Remark 1 Mild Steel 2.7 x 12.7 x 25.4 34.38 150,000 4365 Ductile failure 2 Brass 2.7 x 12.7 x 25.4 34.38 200,000 5820 Brittle failure 3 Aluminu m 2.7 x 12.7 x 25.4 34.38 100,000 2910 Ductile failure Calculations: ● Compressive Strength for Mild Steel: ○ σ = P/A = 150,000 N / 34.38 mm2 = 4365 N/mm2 ● Compressive Strength for Brass: ○ σ = P/A = 200,000 N / 34.38 mm2 = 5820 N/mm2 ● Compressive Strength for Aluminum: ○ σ = P/A = 100,000 N / 34.38 mm2 = 2910 N/mm2 Conclusion mild steel exhibits the highest compressive strength followed by brass and aluminum, with corresponding failure modes of ductile, brittle, and ductile, respectively. Practical Related Questions: 1. State the maximum capacity of CTM you have used. Answer: Capacity 2000kN 2. State the loading range available in the machine along with its least count. Answer: Practicalkida.com