Design and Analysis of IST-LEJ Based on Tension Band Parameters

doi:10.3901/JME.2018.13.094

Abstract

Abstract: A new type of flexure hinge, named inverted stripe-type torsional lamina emergent joint (IST-LEJ), is proposed. The structural form of the hinge is designed, and its bending equivalent stiffness is deduced. The correction coefficient based on characteristic parameters of the tension band is put forward. Through the theoretical calculation and the finite element simulation analysis, the correctness of the bending equivalent stiffness formula based on the modified coefficient is verified. The correctness of the theoretical formula of equivalent stiffness and the validity of the correction coefficient are further verified by the examples of different tension band sizes. A finite element model of IT-LEJ with the same dimensions and characteristic parameters of IST-LEJ design example is established, and the bending and tensile resistant properties of IST-LEJ and IT-LEJ are compared. Finally, the failure analysis of the two hinges of polypropylene and beryllium bronze is carried out, and the bending deformation range of hinges with different materials is obtained.

Key words: bending equivalent stiffness, failure analysis, finite element, flexure hinge

CLC Number:

TH122

QIU Lifang, WANG Jinglin, LIU Ningning. Design and Analysis of IST-LEJ Based on Tension Band Parameters[J]. Journal of Mechanical Engineering, 2018, 54(13): 94-101.

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