| A | B |
|---|
| Stiff | Large value of Young's modulus |
| Flexible | Small value of Young's modulus |
| Plastic deformation | Deformation beyond the elastic limit |
| Elastic deformation | Deformation up to the elastic limit |
| Brittle | Very small plastic region |
| Hookean | Region where stress is proportional to strain |
| Tough | Material with large area under stress-strain graph |
| Tensile strength | Maximum stress in tension |
| Compressive strength | Maximum stress in compression |
| Tension | Layers of atoms increase their separation |
| Compression | Layers of atoms reduce their separation |
| Shear | Layers of atoms slide over each other |
| Area under stress-strain graph | Work done in deformation (per unit volume) |
| Gradient of linear section of stress-strain graph | Young's modulus |
| Gradient of linear section of force-deformation graph | Force constant |
| Area under force-deformation graph | Work done in deformation |
| Strain energy | Elastic potential energy per unit volume |
| Stress | Force/Cross-sectional area |
| Strain | Deformation/original length |
| Proportional limit | Point at end of linear section of stress-strain graph |
| Symbol for stress | σ |
| Symbol for strain | ε |
| strong | large fracture stress |
| prestressed | under compression before loading |
| Hooke's Law | Ε = σ/ε |
| tie | structure part under tension |
| strut | structure part under compression |
| truss | network of struts, ties and beams |
| bulk modulus equation | ΔP = B(ΔV/V) |
| ductile | large plastic region |
| composite material | made of two complementary materials |
| bulk modulus | 3D version of Young's modulus |
