Example Values
The following table shows some typical values of fracture toughness for various materials:
| Material type | Material | KIc (MPa · m1/2) |
|---|---|---|
| Metal | Aluminum alloy (7075) | 24 |
| Steel alloy (4340) | 50 | |
| Titanium alloy | 44–66 | |
| Aluminum | 14–28 | |
| Ceramic | Aluminium oxide | 3–5 |
| Silicon carbide | 3–5 | |
| Soda-lime glass | 0.7–0.8 | |
| Concrete | 0.2–1.4 | |
| Polymer | Polymethyl methacrylate | 0.7–1.6 |
| Polystyrene | 0.7–1.1 | |
| Composite | Mullite-fibre composite | 1.8–3.3 |
| Silica aerogels | 0.0008–0.0048 |
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