2.56 stiffness. Ratio of change of force to the corresponding change in translational displacement of an elastic element. Unit, newton per meter (N/m).
Annotation 1 In the case of torsional stiffness, “force” and “displacement,” respectively, are replaced by “torque” and “angular displacement” and the unit is newton meter per radian (Nm/rad).
Annotation 2 See also 6.32.
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