Sheet-metal strain-analysis system based on a square reference-grid

1984 ◽  
Vol 9 (1) ◽  
pp. 5-20 ◽  
Author(s):  
Warren R. Thorpe ◽  
Trevor J. Nihill
Keyword(s):  
Sheet Metal ◽  
Strain Analysis ◽  
Reference Grid ◽  
Metal Strain ◽  
Analysis System

Exposure-fusion-based dot-grid image acquisition and recognition for sheet metal strain analysis

2017 ◽  
Vol 56 (35) ◽  
pp. 9706
Author(s):  
Bao-Quan Shi ◽  
Li-Kun Zhang ◽  
Chen-Song Yao ◽  
Shu-Xing Du ◽  
JunJie Ye
Keyword(s):  
Sheet Metal ◽  
Image Acquisition ◽  
Strain Analysis ◽  
Exposure Fusion ◽  
Metal Strain

Fast FE analysis system for sheet metal stamping—FASTAMP

2007 ◽  
Vol 187-188 ◽  
pp. 402-406 ◽  
Author(s):  
Du Ting ◽  
Liu Yuqi ◽  
Zhang Zhibing ◽  
Li Zhigang
Keyword(s):  
Sheet Metal ◽  
Fe Analysis ◽  
Sheet Metal Stamping ◽  
Metal Stamping ◽  
Analysis System

scholarly journals DESIGN OF A CLOSE-UP STEREO VISION BASED SHEET METAL INSPECTION SYSTEM

2011 ◽  
Author(s):  
M. S. Goldstein ◽  
J. P. Mitchell ◽  
R. V. Fleisig ◽  
A. D. Spence
Keyword(s):  
Sheet Metal ◽  
Electrochemical Etching ◽  
Three Dimensional ◽  
Strain Analysis ◽  
Inspection System ◽  
Grid Pattern ◽  
System A ◽  
Dimensional Reconstruction ◽  
Geometry Inspection ◽  
Achievable Accuracy

This paper describes the design and implementation of a close-up stereo computer vision based sheet metal strain and geometry inspection system. A square grid pattern is first applied to the part using either electrochemical etching or screen printing. The part is formed, and measured using a two camera sensor that can be attached to a CMM or FARO arm. Image processing is used to extract the corners of the deformed grid for either three dimensional reconstruction, or for strain analysis. Graphical results are conveniently displayed using HOOPS. Sample measurements using both steel and aluminum test domes indicate an achievable accuracy comparable to other systems.

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