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bom制作技术
shear_modulus =. mass_density = 7.85e-6. thermal_expansion_coefficient =. therm_expansion_ref_temperature =. structural_damping_coefficient =. stress_limit_for_tension =. stress_limit_for_compression =. stress_limit_for_shear = ...

G = Shear modulus
http://en.wikipedia.org/wiki/Shear_modulus (don't use these values for actual engineering design work - they are examples and should only be used for educational purposes). G is material dependent. Best to use values from materials ...