Design and analysis of Lamina Emergent Joint (LEJ) based on origami technology and mortise-tenon structure.

• A method to achieve large deformation of LET joints in multiple directions through origami. • A foldable mortise-tenon structure (FMTS) is proposed to make permanent creases. • The parameters of FMTS are optimized by the MOGA method. • A 2DOF-LEJ was designed to verify the feasibility of the proposed method and FMTS. • The proposed method and FMTS can provide more possibilities for the application of LEMs. 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. [Display omitted] [ABSTRACT FROM AUTHOR]