11/03/2014

Workbench - Mechanical Structural Nonlinearities Overview

Recall, in the 1600s, Robert Hooke discovered a simple linear relationship between force (F) and displacement (u), known as Hooke’s Law: 
  F = Ku
The constant K represents structural stiffness.
A linear structure obeys this linear relationship.   A common example is a simple spring:

Significant classes of structures do not have a linear relationship between force and displacement.
Because a plot of F versus u for such structures is not a straight line, such structures are said to be nonlinear
The stiffness is no longer a constant, K; it becomes a function of applied load, KT (the tangent stiffness).

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