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TECHNICAL PAPERS

Three-Dimensional Optical Measurements of Porous Foams

[+] Author and Article Information
Albert J. Shih, Zhenhua Huang

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125

J. Manuf. Sci. Eng 128(4), 951-959 (Feb 26, 2006) (9 pages) doi:10.1115/1.2194556 History: Received October 17, 2004; Revised February 26, 2006

The optical, noncontact stereovision system and data analysis procedure are developed for the measurement of porous foams. The stereovision measurement system has demonstrated the capability to capture both the micro-scale features and the macro-scale shape of both the open-cell and closed-cell porous foams. A computational procedure, denoted as the grid method, is developed to identify representative planes on the porous foam surface using the stereovision measured data points. The relative positions between planes can be used to calculate the angles and distances between porous foam surfaces. A SiC open-cell and an aluminum closed-cell foams are used as examples to validate the grid method and demonstrate its computational efficiency. This research enables the form measurements and geometrical dimensioning and tolerancing of porous foams for quality control and assembly and contact analysis.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Isometric overview of the SiC open-cell foam: (a) photograph and (b) dimensions and surface designation of the foam

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Figure 2

The SiC foam represented by points measured using the stereovision system

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Figure 3

Surface features on the open-cell SiC foam: (a) original, as-fired surface (close-up view of region R1 on surface F1 in Fig. 1) and (b) machined surface (close-up view of region R2 of surface F4 in Fig. 1)

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Figure 4

Close-up view (photos and data points) of ligaments on the original, as-fired surface F1 of SiC foam: (a) stem and (b) edge of a ligament

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Figure 5

Close-up view (photos and data points) of the machined surface of the SiC foam: (a) machined surface of ligaments cut axially (close-up view of region R4 in Fig. 3) and (b) large machined surface ligament cut radially (close-up view of region R5 in Fig. 3)

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Figure 6

Distributions of point depth from the top plane: (a)F1 in Fig. 1 with the original, as-fired surface and (b)F3 in Fig. 1 with the machined surface

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Figure 7

Example of the grid method to determine the grid peak, local peak, and top plane of a set of points for porous foam: (a) isometric view, (b) top view, and (c) side view of plane A1A2A3

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Figure 8

Flowchart of the procedures to identify a representative plane for the porous foam surface

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Figure 10

Close-up view (photos and data points) of the three local peaks on surface F1 in Fig. 9: (a)P11, (b)P12, and (c)P13

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Figure 11

Top view of surface F2 in the open-cell SiC foam and local peaks P21, P22, and P23: (a) photograph and (b) measured points

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Figure 12

Close-up view (photos and data points) of the three local peaks on surface F2 in Fig. 1: (a)P21, (b)P22, and (c)P23

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Figure 13

Isometric overview of the surface F5 in the aluminum closed-cell foam: (a) photograph and (b) measured points representing the foam

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Figure 14

Top view of surface F5 in the aluminum closed-cell foam and local peaks P31, P32, and P33: (a) photograph and (b) measured points

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Figure 15

Close-up view (photos and data points) of the three local peak points of the closed-cell aluminum foam surface: (a)P31, (b)P32, and (c)P33

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Figure 9

Top view of surface F1 and local peaks P11, P12, and P13 in the open-cell SiC foam: (a) photograph and (b) measured points

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