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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