Compliant Mechanisms: Design of Flexure Hinges by Nicolae Lobontiu

By Nicolae Lobontiu

Flexure hinges carry numerous benefits over classical rotation joints, together with no friction losses, little need for lubrication, no hysteresis, compactness, means to be used in small-scale functions, ease of fabrication, almost no meeting, and no required upkeep. Compliant Mechanisms: layout of Flexure Hinges presents functional solutions to the current and destiny wishes of effective layout, research, and optimization of units that comprise flexure hinges. With a hugely unique procedure the text:Discusses new and classical sorts of flexure hinges (single-, - and multiple-axis) for 2- and third-dimensional applicationsAddresses a variety of commercial purposes, together with micro- and nano-scale mechanismsQuantifies flexibility, precision of rotation, sensitivity to parasitic loading, power intake, and pressure boundaries via closed-form compliance equationsOffers a unitary presentation of person flexure hinges as fully-compliant participants via closed-form compliance (spring charges) equationsFully defines the lumped-parameter compliance, inertia and damping houses of flexure hinges Develops a finite aspect method of compliant mechanisms via giving the basic formula of latest flexure hinge line elementsIncorporates extra complicated issues devoted to flexure hinges together with huge deformations, buckling, torsion, composite flexures, form optimization and thermal effectsCompliant Mechanisms: layout of Flexure Hinges presents useful solutions and instructions to the desires of successfully designing, interpreting, and optimizing units that come with flexure hinges. It comprises ready-to-use plots and easy equations describing a number of flexure varieties for the pro that wishes fast suggestions to present functions. The ebook additionally offers self-contained, easy-to-apply mathematical instruments that supply enough assistance for real-time challenge fixing of extra purposes.

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Sample text

9a, two translations about the x and y axes and one rotation about the sensitive axis of the hinge are generally possible. Each of these motions possesses the characteristics of a spring, and each corresponding stiffness plays a role in the overall deformation of the flexure in a realistic compliant mechanism where the loading is general and comprises forces that are directed along the x and y axes, in addition to a pure bending moment (that would produce the desired rotation about the sensitive axis and will activate the torsional stiffness of the flexure).

This theorem represents the key tool for deriving all closed-form compliance equations that will follow. An example will accompany the theoretic presentation to better reinforce the main points of the theorem. In flexure-based compliant mechanisms, the flexure hinges are the first components to be failure prone, as they have the foremost exposure to loading, given their smaller dimensions. A presentation of the theories and associated criteria of material failure will follow; the discussion is specifically dedicated to ductile materials and includes coverage of related topics such as fatigue and stress concentration.

L. , A method for the design of compliant mechanisms with small-length flexural pivots, ASME Journal of Mechanical Design, 116(1), 280, 1994. 12. L. , Parametric deflection approximations for end-loaded, large-deflection beams in compliant mechanisms, ASME Journal of Mechanical Design, 117(1), 156, 1995. 13. L. , Determination of the degrees of freedom of compliant mechanisms using the pseudo-rigid-body model concept, in Proc. of the Ninth World Congress on the Theory of Machines and Mechanisms, Milano, Italy, 2, 1995, p.

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