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Abstract
Lamina Emergent Mechanisms (LEMs) are an important part of compliant mechanisms, and origami technology can fold simple two-dimensional planes into complex three-dimensional geometries. This paper introduces a design method to achieve large deformation of Lamina Emergent torsional (LET) joints in multiple directions through origami technology. A Foldable mortise-tenon structure (FMTS) is proposed to make permanent creases in origami-based mechanisms. The influence of structural parameters of the FMTS on its maximum deformation and maximum stress under tension is studied. Based on the proposed method and structure, a two degree of freedom Lamina Emergent Joint (2DOF-LEJ) is designed. The structural design, equivalent stiffness analysis, and finite element analysis (FEA) of the 2DOF-LEJ are carried out. Experimental tests verify the effectiveness of the proposed method and FMTS on the prototype. Finally, some applications of the proposed method and FMTS in origami-based mechanisms are discussed.
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