Compliant Joint Design Principles for High Compressive Load Situations

[+] Author and Article Information
Alexandre E. Guérinot, Spencer P. Magleby, Larry L. Howell, Robert H. Todd

 Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602

A version of the cross-axis flexural pivot has been developed and commercialized by Bendix®.

J. Mech. Des 127(4), 774-781 (Jun 17, 2004) (8 pages) doi:10.1115/1.1862677 History: Received April 21, 2003; Revised June 17, 2004

Buckling failure has been a major obstacle in designing compliant joints in high compression applications. This paper describes two principles, isolation and inversion, that can be successfully applied to many compliant joints to increase their ability to withstand high compressive loads by avoiding buckling-prone loading conditions. Isolation and inversion give rise to a new breed of compliant joints called high compression compliant mechanisms (HCCM). HCCMs have many of the inherent advantages of compliant mechanisms with the additional qualities of high load-bearing joints. This added robustness in compression can be achieved without adversely affecting the kinematic behavior of the joint.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Examples of basic compliant joints. Joints are shown with segment A fixed to the ground and segment B rotating with respect to the ground.

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Figure 2

Examples of complex compliant joints. Joints a and b are shown with segment A fixed to the ground and segment B rotating with respect to the ground.

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Figure 3

Assumed loading environment during (a) joint compression and (b) joint actuation. Arrows represent the applied compressive force in (a), and the applied actuation moment in (b).

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Figure 4

Evaluation criteria for joint types under compression: (a) maximum allowable load Pcr, (b) maximum infinite fatigue life bending angle θmax(infinitelife), and (c) actuation moment Mactuation, θmax(infinitelife), and off-plane stiffness.

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Figure 5

Isolation joint system schematic composed of a compliant joint and a passive rest

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Figure 6

The shell concept (a) closed and (b) opened showing the enclosed compliant mechanism

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Figure 7

Example of an isolation-based HCCM concept

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Figure 8

Relative motion types between cam and socket of passive points. (a) Pure rotation, (b) cam center of rotation centered on the socket surface, (c) pure translation, and (d) combination of rotation and translation

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Figure 9

The inversion method schematic

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Figure 10

Example of inversion HCCM concepts

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Figure 11

Schematic of the cross-axis flexural pivot

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Figure 12

Illustration of the loading condition equivalence between (a) compression and (b) tension in the case of torsional hinges




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