Publication: Laser Digitizer / Parallel Computer Based Sheet Metal Formability Analysis

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Title Laser Digitizer / Parallel Computer Based Sheet Metal Formability Analysis
Authors/Editors* Chan, H.L., Spence, A.D., and Sklad, M.P.
Where published* ASME Journal of Computing and Information Science in Engineering
How published* Journal
Year* 2004
Volume 0
Number 0
Publisher xxxxx
Keywords image processing, sheet metal strain analysis, parallel computing
Link submitted
This paper presents the novel use of a laser digitizer in an industrially relevant sheet metal strain analysis application. First, a dark coloured circular grid pattern is electrochemically etched onto a flat, galvanized steel sheet. The sheet is then stamped to the desired shape, causing the grid circles to deform into ellipses. The deformed surface is then laser digitized at 0.1 mm increments, with both the surface (X,Y,Z) coordinates and the reflected light intensity (gray level) being recorded. The recorded image is then automatically processed to separate the dark grid points from the lighter background, and to group adjacent grid points into an ellipse group. Orthogonal distance least squares data fitting is then used to calculate the major and minor axis lengths for the ellipse, and hence the local strain. Results are presented using a Forming Limit Diagram (FLD) and a 3D image of the deformed surface color coded to depict the thickness strain. To reduce processing time for the large quantity of data, the algorithms were implemented on a high performance parallel computer. Practical results for a tailor welded blank sample illustrate the work.
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