Research Papers

Cantilever Snap-Fit Performance Analysis for Haptic Evaluation

[+] Author and Article Information
Jingjing Ji

Department of Mechanical Engineering,  Zhejiang University, Hangzhou 310027, China

Kok-Meng Lee

Woodruff School of Mechanical Engineering,  Georgia Institute of Technology, Atlanta, GA 30332-0405kokmeng.lee@me.gatech.edu

Shuyou Zhang1

Department of Mechanical Engineering,  Zhejiang University, Hangzhou 310027, Chinazsy@zju.edu.cn.


Corresponding author.

J. Mech. Des 133(12), 121004 (Dec 09, 2011) (8 pages) doi:10.1115/1.4005085 History: Received February 13, 2011; Revised August 28, 2011; Published December 09, 2011; Online December 09, 2011

This paper investigates the parametric effects, which include material properties, hook shape, and shear deformation, on the force/deflection relationship governing the assembly/disassembly processes of a snap-fit for developing embedded algebraic solutions to achieve realistic force feedback through a haptic device. For this purpose, an algebraic model, which isolates individual parametric factors that contribute to the cantilever hook deflection, has been derived for examining assumptions commonly made to simplify models for design optimization and real-time control. The algebraic model has been verified by comparing computed results against those simulated using ANSYS FEA workbench and published approximate solutions. Additionally, the model has been validated by comparing the friction coefficients of three different snap-fit designs (with same materials), which closely agree within 5% of their root-mean-square value. Implemented on a commercial PHANTOM haptic device, we demonstrate the effectiveness of the model as embedded algebraic solutions for haptic rendering in design. Nine individuals participated in evaluating a set of design options with different parameter settings; 78% of whom chose the optimal theoretical solution by feeling the feedback force. These findings demonstrate that the design confidence of assembly robustness can be enhanced through a relatively accurate virtual force feedback.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Cantilever hook and matching part; (a) coordinate systems and characteristic dimensions, (b) sketch illustrating deflection, (c) forces components in insertion, and (d) forces components in retention

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Figure 2

Ωi as a percentage of (Ω++Ω-)

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Figure 3

Comparing SM1 and SM2 against CM

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Figure 4

Forces computed using CM for assembly and disassembly

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Figure 5

Insertion force versus displacement

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Figure 6

Outlet design configurations and friction coefficient; (a) determining μ and (b) three different outlet design configurations

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Figure 7

Haptic evaluation procedure

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Figure 8

Haptic feedback curve




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