Modulus of Rigidity
Shear Modulus (Modulus of Rigidity) is the elasticity coefficient for shearing or torsion force.
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Modulus of Rigidity - G - (Shear Modulus) is the coefficient of elasticity for a shearing force. It is defined as
- "the ratio of shear stress to the displacement per unit sample length (shear strain)"
Modulus of Rigidity can be experimentally determined from the slope of a stress-strain curve created during tensile tests conducted on a sample of the material.
The definition of Modulus of Rigidity:
- the ratio of shear stress to the displacement per unit sample length (shear strain)
Modulus of Rigidity of some Common Materials
| Material | Shear Modulus - G - (GPa) (106 psi) |
|---|---|
| Aluminum Alloys | 27 |
| Aluminum, 6061-T6 | 24 |
| Aluminum, 2024-T4 | 28 |
| Beryllium Copper | 48 |
| Brass | 40 |
| Bronze | 44.8 |
| Cadmium | 19 |
| Carbon Steel | 77 |
| Cast Iron | 41 |
| Chromium | 115 |
| Concrete | 21 |
| Copper | 45 |
| Glass | 26.2 |
| Glass, 96% silica | 19 |
| Inconel | 79 |
| Iron, Ductile | 63 - 66 |
| Iron, Malleable | 64 |
| Kevlar | 19 |
| Lead | 13.1 |
| Magnesium | 16.5 |
| Molybdenum | 118 |
| Monel metal | 66 |
| Nickel Silver | 48 |
| Nickel Steel | 76 |
| Nylon | 4.1 |
| Phosphor Bronze | 41 |
| Plywood | 0.62 |
| Polycarbonate | 2.3 |
| Polyethylene | 0.12 |
| Rubber | 0.0003 |
| Structural Steel | 79.3 |
| Stainless Steel | 77.2 |
| Steel, Cast | 78 |
| Steel, Cold-rolled | 75 |
| Tin | 18 |
| Titanium, Grade 2 | 41 |
| Titanium, Grade 5 | 41 |
| Titanium, 10% Vanadium | 42 |
| Tungsten | 161 |
| Wood, Douglas Fir | 13 |
| Zinc | 43 |
| Z-nickel | 76 |
- 1 GPa = 109 Pa = 0.145 x 106 psi (lbf/in2)
- 1 x 106 psi = 6.9 GPa
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