Modulus of Rigidity

Shear Modulus (Modulus of Rigidity) is the elasticity coefficient for shearing or torsion force. It is defined as the ratio of shear stress to the displacement per unit sample length (shear strain).

MaterialShear Modulus - G (GPa)
Aluminum Alloys27
Aluminum, 6061-T624
Aluminum, 2024-T428
Beryllium Copper48
Brass40
Bronze44.8
Cadmium19
Carbon Steel77
Cast Iron41
Chromium115
Concrete21
Copper45
Glass26.2
Glass, 96% silica19
Inconel79
Iron, Ductile63-66
Iron, Malleable64
Kevlar19
Lead13.1
Magnesium16.5
Molybdenum118
Monel metal66
Nickel Silver48
Nickel Steel76
Nylon4.1
Phosphor Bronze41
Plywood0.62
Polycarbonate2.3
Polyethylene0.12
Rubber0.0003
Structural Steel79.3
Stainless Steel77.2
Steel, Cast78
Steel, Cold-rolled75
Tin18
Titanium, Grade 241
Titanium, Grade 541
Titanium, 10% Vanadium42
Tungsten161
Wood, Douglas Fir13
Zinc43
Z-nickel76

Definition

Modulus of Rigidity (G) - also known as Shear Modulus - is the coefficient of elasticity for a shearing force.

Shear Modulus = Shear Stress / Shear Strain

Key Information

  • 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.
  • 1 GPa = 10⁹ Pa = 0.145×10⁶ psi (lbf/in²)
  • 1×10⁶ psi = 6.9 GPa
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