ME10 · Sem 3 · Materials testing
Tensile test of mild steel
Aim: Find E, yield strength, UTS and elongation of mild steel on a UTM.
🧪 Live simulation🧊 Real-time 3D bench⚠ Simulated values, not physical measurements
🔬 Virtual lab
Starting the lab…
📘 Theory
Mild steel shows linear elasticity, a sharp yield point with a Lüders plateau, strain hardening up to the ultimate strength, then necking and ductile fracture.
σ = F/A₀ · ε = ΔL/L₀ · E = σ/ε (elastic)
🧰 Apparatus (virtual)
- Universal testing machine
- Ø10 mm dog-bone specimen
- extensometer
📝 Procedure
🎤 Viva questions
What is the 0.2 % offset yield
The stress where a line parallel to the elastic slope, offset by 0.2 % strain, cuts the curve.
Why does the engineering stress fall after UTS
The neck reduces the area but we divide by the original area.
🛡️ Safety
Virtual by default. Machine shops, CNC, presses and test rigs need instructor supervision, PPE and machine-specific safety training.