Design of Compliant Mechanisms
Design of Compliant Mechanisms
Design of Compliant Mechanisms
Classification
1. Discrete compliance
2. Distributed compliance
Degree of freedom
DoF =
Linear and non-linear analysis
a) Large displacements
b) Large strains -
3. Stress stiffening
Displacements of tip of cantilever beam
(Bending equation)
Locus of a loaded tip of a cantilever beam
If we observe the pattern of the tip, when the load is applied locus of the tip approximates a circular arc.
The locus can be approximated the circular arc for a very large range of motion.
Take 5-6th of the length from the free end and move over the fixed pivot to this point, the locus of the free tip approximates a circular arc about
this new fixed pivot point
Kinematic approximation
we can replace that beam with a rigid body torsion spring then
we can go back to the literature of kinematics and do our
analysis and synthesis comfortably and then come back when
you want to have compliant mechanism replace that rigid
body torsion spring, back to in elastic
Advantages and disadvantages
Advantages
Disadvantages
Mechanical efficiency of the compliant mechanisms is low because some part of the applied force is stored as the strain
energy in the elastic segments