• Dislocation-driven elastic response and damping across crystals and metals, showing how dislocations govern moduli, damping, and frequency/temperature dependence, including mobility and irradiation effects in silicon–iron, copper, and aluminum alloys. [2], [7], [4], [20], [11]

• Porosity and voids are primary determinants of mechanical properties in ceramics and composites, demonstrated by elastic-constant calculations for hole-containing solids and porosity-weakening in sintered alumina/zirconia and related materials. [1], [5], [18]

• Hydrostatic pressure profoundly modifies mechanical behavior in polymers and crystalline polymers, with explicit measurements of modulus changes under pressure and high-pressure regimes in polyolefins and polyoxymethylene. [6], [19], [13]

• Measurement and characterisation methods for elastic properties: ultrasonic measurements, torsion pendulums, and internal-friction studies enabling modulus, damping, and network-property insight in polymers and small specimens. [10], [9], [17], [12], [14], [16]

• Rubber elasticity and polymer networks: cross-linking, tearing energy, and network theory underpin elasticity and failure, complemented by studies of damping and rate-dependent tearing. [3], [15], [14], [16], [17]