Shear Modulus of Aluminium Alloy
| Value | 2.6e10 Pa |
| Status | Measured: ± 1,000,000,000 Pa (0.038 relative) |
| Source | Aluminum Design Manual (The Aluminum Association) |
| Categories | Material PropertiesEngineering & Trademechanics |
| pascal | 26,000,000,000 Pa |
| kilopascal | 26,000,000 kPa |
| megapascal | 26,000 MPa |
| bar | 260,000 bar |
| atmosphere | 256,600.05 atm |
| millimeter of mercury | 195,016,010 mmHg |
| pound per square inch | 3,770,981.2 psi |
| foot of water column | 8,698,366.7 ft H₂O |
| gigapascal | 26 GPa |
| kip per square inch | 3,770.9812 ksi |
| inch of mercury | 7,677,795.7 inHg |
| inch of water column | 104,380,400 in w.g. |
Learning zone
Applying G = E / [2(1 + ν)] with E = 68.9 GPa and ν = 0.33 gives 25.9 GPa, and handbooks quote 26 GPa (3.8 × 10⁶ psi) for the 5000, 6000 and 7000 series alike. As with Young's modulus, temper and alloy move it by a couple of percent at most.
Aluminium's low shear modulus is a bigger practical problem than its low Young's modulus, because aluminium sections are typically thin-walled extrusions and thin walls are what torsion and shear buckling punish. A 6061 open channel resisting torque twists roughly three times as much as an identical steel one; shear-buckling and web-crippling checks that are formalities in steel become governing limit states in aluminium. Treat this value as isotropic room-temperature wrought material — castings are lower and less consistent, and everything softens above about 150 °C.