Journal ArticleDOI
Stiffness characterization of corner-filleted flexure hinges
TLDR
In this paper, the authors derived closed-form stiffness equations for corner-filleted flexure hinges, which can be used to characterize the static, modal, and dynamic behavior of single-axis corner-face flexures.Abstract:
The paper formulates the closed-form stiffness equations that can be used to characterize the static, modal, and dynamic behavior of single-axis corner-filleted flexure hinges, which are incorporated into macro/microscale monolithic mechanisms. The derivation is based on Castiliagno’s first theorem and the resulting stiffness equations reflect sensitivity to direct- and cross-bending, axial loading, and torsion. Compared to previous analytical work, which assessed the stiffness of flexures by means of compliances, this paper directly gives the stiffness factors that completely define the elastic response of corner-filleted flexure hinges. The method is cost-effective as it requires considerably less calculation steps, compared to either finite element simulation or experimental characterization. Limit calculations demonstrate that the known engineering equations for a constant cross-section flexure are retrieved from those of a corner-filleted flexure hinge when the fillet radius becomes zero. The analytical model results are compared to experimental and finite element data and the errors are less than 8%. Further numerical simulation based on the analytical model highlights the influence of the geometric parameters on the stiffness properties of a corner-filleted flexure hinge.read more
Citations
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Journal ArticleDOI
Three flexure hinges for compliant mechanism designs based on dimensionless graph analysis
TL;DR: In this paper, the in-plane and out-of-plane stiffnesses of the flexure hinges are derived for the purpose of optimized geometric design, based on the developed methodologies, the influences of the geometric parameters on the performance of the flexible hinge are investigated.
Journal ArticleDOI
Closed-form compliance equations of filleted V-shaped flexure hinges for compliant mechanism design
TL;DR: In this article, the in-plane and out-of-plane compliance equations for the flexure hinges are developed based on the Castigliano's second theorem and the accuracy of motion is derived for optimized geometric design.
Journal ArticleDOI
Kinetostatic and Dynamic Modeling of Flexure-Based Compliant Mechanisms: A Survey
TL;DR: This paper surveys and compares the conceptual ideas, key advances, and applicable scopes, and open problems of the state-of-the-art kinetostatic and dynamic modeling methods for compliant mechanisms in terms of small and large deflections.
Journal ArticleDOI
A unified geometric model for designing elastic pivots
TL;DR: In this article, a more general geometric model suited to representing the entire family of conic section shapes using quadratic rational Bezier curves is presented, and the utility of this formulation is demonstrated by optimizing an elastic pivot to meet compliance and stress requirements.
Journal ArticleDOI
Design and analysis of a high-accuracy flexure hinge
TL;DR: The new quasi-V-shaped flexure hinge obtained by using a topology optimization approach has a higher accuracy of rotation and better ability of preserving the center of rotation position but smaller compliance.
References
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Book
Roark's Formulas for Stress and Strain
TL;DR: This chapter discusses the Behavior of Bodies Under Stress, which involves tension, Compression, Shear, and Combined Stress, and the role of Fasteners and Joints in this Behavior.
Book
Compliant Mechanisms: Design of Flexure Hinges
TL;DR: The second edition of Compliant Mechanisms: Design of Flexure Hinges as mentioned in this paper provides practical answers to the design and analysis of devices that incorporate flexible hinges by means of a bottom-up compliance (flexibility) approach.
Journal ArticleDOI
Corner-Filleted Flexure Hinges
TL;DR: In this paper, an analytical approach to corner-filleted flexure hinges is presented, where closed-form solutions for the in-plane compliance factors are derived for the CFI.
Journal ArticleDOI
Elliptical flexure hinges
TL;DR: In this article, the authors presented closed form equations based on a modification of those originally derived by Paros and Weisbord in 1965, for the mechanical compliance of a simple monolithic flexure hinge of elliptic cross section, the geometry of which is determined by the ratio e of the major and minor axes.
Journal ArticleDOI
Flexure hinges for piezoactuator displacement amplifiers: flexibility, accuracy, and stress considerations
TL;DR: In this article, the design of flexure hinges for piezoelectric actuators is compared with more complex corner-filleted and elliptical forms that can now be manufactured by wire electrodischarge machining.