Abstract
Piezoelectric actuators are becoming increasingly popular in industrial applications. Because of their low displacement and high force outputs, they are commonly coupled through flexure-hinged mechanical displacement amplifiers. This paper considers aspects of the design of flexure hinges for such structures. Traditional “right-circular” hinge profiles, commonly produced by drilling, are compared with more complex corner-filleted and elliptical forms that can now be manufactured by such processes as wire electrodischarge machining. It is concluded that elliptical profiles have advantages in achieving long fatigue life, but corner-filleted design offers the highest flexibility.
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