This paper investigates the existing stiffness equations for corner-filleted
flexure hinges. Three empirical stiffness equations for corner-filleted
flexure hinges (each fillet radius, r, equals to 0.1 l; l, the length of
a corner-filleted flexure hinge) are formulated based on finite element
analysis results for the purpose of overcoming these investigated
limitations. Three comparisons made with the existing compliance/stiffness
equations and finite element analysis (FEA) results indicate that the
proposed empirical stiffness equations enlarge the range of rate of thickness
(t, the minimum thickness of a corner-filleted flexure hinge) to length
(l), t/l (0.02 ≤ t/l ≤ 1) and ensure the accuracy for each
empirical stiffness equation under large deformation. The errors are within
6% when compared to FEA results
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