Comparison of different analysis models to measure plastic strains on sheet metal forming parts by digital image processing

2001 ◽  
Author(s):  
Quang-Cherng Hsu
Keyword(s):  
Image Processing ◽  
Sheet Metal ◽  
Digital Image Processing ◽  
Digital Image ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Plastic Strains ◽  
Analysis Models

Investigation of Process Parameters Based on Kriging in Sheet Metal Forming

2011 ◽  
Vol 346 ◽  
pp. 128-135
Author(s):  
Yan Min Xie ◽  
Xiao Mei Xu
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Numerical Procedure ◽  
Computer Experiments ◽  
Kriging Model ◽  
Engineering Problem ◽  
Forming Process ◽  
Metal Forming Process ◽  
Analysis Models

Design and analysis of computer experiments have been widely investigated. This study presents numerical procedure to optimize the sheet metal forming process. Metamodels based on responses from numerical experiments may form efficient approximations to functions in engineering analysis. They can improve the efficiency of engineering optimization substantially by uncoupling computationally expensive analysis models and (iterative) optimization procedures. This paper investigated the kriging metamodel approach. At the same time, the practical nonlinear engineering problems such as square drawing are also optimized successfully by proposed method. The results prove Kriging model is an effective method for nonlinear engineering problem in practice.

CGA: An image processing based software for surface strain analysis in sheet metal forming

2021 ◽  
pp. 030932472199657
Author(s):  
Wankhede Pankaj ◽  
Tejas Radhakrishnan ◽  
Kurra Suresh ◽  
Sudha Radhika
Keyword(s):  
Image Processing ◽  
Sheet Metal ◽  
Measurement System ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Strain Measurement ◽  
Strain Analysis ◽  
Surface Strain ◽  
Percentage Error ◽  
Flat Sheet

Strain analysis is an essential step in sheet forming applications to understand the deformation behaviour of the material. The strain analysis is conventionally performed by Circle Grid Analysis (CGA). In CGA, a grid of circles with 2 mm–5 mm diameter is printed on a flat sheet and deformed into the required shape. The length of major and minor axes of the deformed ellipses are measured to estimate the strains at different locations of the formed component. The major and minor axes length of the deformed ellipses are measured either by using a manual method or automatic methods. The automated methods are faster and accurate compared to manual methods, but to perform strain measurement using commercially available automatic strain measurement system, is very expensive. Therefore, in this paper, an image processing based software has been developed with user-friendly Graphical User Interface (GUI) for strain measurement and analysis in sheet metal forming operations. The software has been tested on images obtained by printing the ellipses of known dimensions on the flat sheet by laser etching, electrochemical etching and screen printing, which are generally used for printing circular grids on flat sheets for strain analysis in sheet metal forming. It is observed that the edges of the laser engraved ellipse are very slim and easily detected by software compared to other grid printing methods. The developed software can measure the ellipse dimensions with a maximum absolute percentage error of 1.975%. Further, the results of CGA software has been compared with the commercial strain measurement system called Grid Pattern Analyzer (GPA). The mean absolute error in strain measurement using CGA and GPA was found to be 0.0106 and 0.0178, respectively. The statistical test results reveal that there is no evidence to support a claim that there is a difference in mean performance between the two methods.

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