Jixie chuandong (Mar 2020)
Effect of Structural Parameter on Stiffness of Parallel Two-axis Straight Circular Flexible Hinge
Abstract
In order to deeply analyze the micro-displacement deformation performance of parallel two-axis straight circular flexure hinge，based on the assumption of small deformation of elastic beam，the bending theory of variable cross-section continuous beam and the principle of calculus superposition，the calculating formulas of angular deformation and angular stiffness are derived. According to Hooke's law，the calculating formulas of elongation and tensile stiffness for tension-compression deformation are obtained，and the flexure hinge under different structural parameters is also calculated. Finite element analysis is carried out，and structural parameters affecting angular stiffness and tensile stiffness are studied. The results show that the error between finite element solution and analytical solution of angular stiffness is less than 7%，the error between finite element solution and analytical solution of tensile stiffness is less than 3%; stiffness is proportional to minimum thickness and modulus of elasticity，inversely proportional to cutting radius，and minimum thickness is proportional to rigidity. The effect of minimum thickness is the most significant，cutting radius is the second，and modulus of praseodymium is the weakest.
