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Table 1 Mechanical and thermal properties of workpiece and drill bits

From: Minimizing thermal damage to vascular nerves while drilling of calcified plaque

Material Plaque Drill bit (WC) Drill bit (NT)
Density (kg/m3) 2050 1800 4500
Young modulus (GPa) 13.80 540 450
Passion’s ratio 0.33 0.28 0.25
Thermal conductivity (W/m °C) 0.51 40 19
Specific heat (J/kg °C) 516 203 603
Expansion (1/°C) 2.7e−6 4.7e−6 9.4e−6
Initial yield strength 50
Hardening coefficient 101
Coefficient of strain rate 0.03
Coefficient of strain hardening 0.08
Coefficient of thermal softening 0.9