Lamina Emergent Torsional (LET) Joint

Jacobsen, Joseph; Chen, Guimin; Howell, Larry L.; Magleby, Spencer P.

doi:10.1016/j.mechmachtheory.2009.05.015

Cited by 96 publications

(48 citation statements)

References 16 publications

(18 reference statements)

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“…A creased or folded paper can be considered a compliant mechanism [18]. Additionally, LEMs are ideal for micro-manufacturing because of their single layer geometries [20]. LEMs achieve complex motions but are simple to manufacture [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluating Compliant Hinge Geometries for Origami-Inspired Mechanisms

Delimont

Magleby

Howell

2015

Journal of Mechanisms and Robotics

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Origami-inspired design is an emerging field capable of producing compact and efficient designs. Compliant hinges are proposed as a way to replicate the folding motion of paper when using nonpaper materials. Compliant hinges function as surrogate folds and can be defined as localized reduction of stiffness. The purpose of this paper is to organize and evaluate selected surrogate folds for use in compliant mechanisms. These surrogate folds are characterized based on the desired motion as well as motions typically considered parasitic. Additionally, the surrogate folds' ability to rotate through large deflections and their stability of center of rotation are evaluated. Existing surrogate folds are reviewed and closed-form solutions presented. A diagram intended as a straightforward design guide is presented. Areas for potential development in the surrogate fold design space are noted.

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Section: Introductionmentioning

confidence: 99%

Evaluating Compliant Hinge Geometries for Origami-Inspired Mechanisms

Delimont

Magleby

Howell

2015

Journal of Mechanisms and Robotics

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“…Origami may also be considered to fit into the class of lamina emergent mechanisms (Jacobsen et al, 2009(Jacobsen et al, , 2010, due to the planar nature of the paper (lamina) and the configuration emerging from the plane of fabrication. Designs ideated through folding are quite different from those synthesized through traditional engineering methods and present desirable characteristics as they are made from a single sheet, employ only one manufacturing process (folding) and are compact.…”

Section: Introductionmentioning

confidence: 99%

“…Creating a "surrogate-crease" has been accomplished by perforation, thinning, a variety of through cuts leaving an optimized geometry which functions similar to a joint (Ferrell et al, 2011;Jacobsen et al, 2009;Wilding et al, 2012) and mechanical hinges. While these methods are well studied and the results provide the desired revolute motion, the intent of this paper is to characterize the behavior of a material when it has been mechanically creased through a folding process.…”

Section: Introductionmentioning

confidence: 99%

Origami-like creases in sheet materials for compliant mechanism design

et al. 2013

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Abstract. The purpose of this research is to evaluate the creasing of non-paper sheet materials, such as plastics and metals, to facilitate origami-based compliant mechanism design. Although it is anticipated that most origami-based design will result from surrogate folds (indirect methods of replacing the crease), it is valuable to provide information that may help in more direct approaches for origami-based design in materials other than paper. Planar sheets of homogeneous material are considered as they maintain the principles fundamental to origami (flat initial state, low cost, readily available). The reduced stiffness along the axis of the crease is an enabling characteristic of origami. Hence a metric based on the deformation of the crease compared to the deformation of the panels enables engineering materials to be evaluated based on their ability to achieve the "hinge-like" behavior observed in folded paper. Advantages of both high and low values of this metric are given. Testing results (hinge indexes, residual angles, localized hinge behavior and cyclic creasing to failure) are presented for various metals and polymers. This methodology and subsequent findings are provided to enable origami-based design of compliant mechanisms.

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“…In spherical mechanisms, all points of the end-link are constrained to move on concentric spherical surfaces that are fixed with respect to the base. With regard to compliant spherical mechanisms, Jacobsen et al [7] studied a spherical bistable micromechanism for 2D mirror arrays that is based on lamina emergent torsional joints. Greenberg et al [8] explored the analogy between flat-folding origami models and spherical lamina emergent mechanisms.…”

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confidence: 99%

Compliance Based Characterization of Spherical Flexure Hinges for Spatial Compliant Mechanisms

Rad

Berselli

Vertechy

et al. 2014

Advances on Theory and Practice of Robots and Manipulators

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In this paper, the closed-form compliance equations for spherical flexures are derived. Each element of the spatial compliance matrix is analytically computed as a function of both hinge dimensions and employed material. The theoretical model is then validated by relating analytical data with the results obtained through Finite Element Analysis. Finally, for a generic loading condition, spherical flexures are compared to circularly curved-beam hinges in terms of secondary compliance factors and maximum stress.

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Lamina Emergent Torsional (LET) Joint

Cited by 96 publications

References 16 publications

Evaluating Compliant Hinge Geometries for Origami-Inspired Mechanisms

Evaluating Compliant Hinge Geometries for Origami-Inspired Mechanisms

Origami-like creases in sheet materials for compliant mechanism design

Compliance Based Characterization of Spherical Flexure Hinges for Spatial Compliant Mechanisms

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