Modulus of Rigidity
Shear Modulus (Modulus of Rigidity) is the elasticity coefficient for shearing or torsion force.
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 stressstrain 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) (10^{6} psi) 

Aluminum Alloys  27 
Aluminum, 6061T6  24 
Aluminum, 2024T4  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, Coldrolled  75 
Tin  18 
Titanium, Grade 2  41 
Titanium, Grade 5  41 
Titanium, 10% Vanadium  42 
Tungsten  161 
Wood, Douglas Fir  13 
Zinc  43 
Znickel  76 
 1 GPa = 10^{9} Pa = 0.145 x 10^{6} psi (lb_{f}/in^{2})
 1 x 10^{6} psi = 6.9 GPa
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