Optical Strain Measurement- Experimental Tool for Validating Sheet Metal Forming Analysis

2006 ◽  
Author(s):  
K. Hariharan ◽  
S. Suresh ◽  
T. Venugopalan ◽  
Anup. K. Sharma
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Strain Measurement ◽  
Experimental Tool ◽  
Optical Strain Measurement ◽  
Forming Analysis ◽  
Optical Strain

A New Approach to the Evaluation of Forming Limits in Sheet Metal Forming

2015 ◽  
Vol 639 ◽  
pp. 333-338 ◽  
Author(s):  
Marion Merklein ◽  
Andreas Maier ◽  
Daniel Kinnstätter ◽  
Christian Jaremenko ◽  
Emanuela Affronti
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Strain History ◽  
Failure Behavior ◽  
Forming Limits ◽  
Optical Strain Measurement ◽  
Optical Strain

The forming limit diagram (FLD) is at the moment the most important method for the prediction of failure within sheet metal forming operations. Key idea is the detection of the onset of necking in dependency of different sample geometry. Whereas the standardized evaluation methods provides very robust and reliable results for conventional materials like deep drawing steels, the determined forming limits for modern light materials are often too conservative due to the different failure behavior. Therefore, within this contribution a new and innovative approach for the identification of the onset of necking will be presented. By using a pattern recognition-based approach in combination with an optical strain measurement system the complete strain history during the test can be evaluated. The principal procedure as well as the first promising results are presented and discussed.

Strain Measurement for Sheet Metal Forming Based on Close Range Photogrammetry

2013 ◽  
Vol 475-476 ◽  
pp. 148-155 ◽  
Author(s):  
Da Cheng Li ◽  
Jin Liang ◽  
Hao Hu ◽  
Zheng Zong Tang ◽  
Xiang Guo ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Strain Measurement ◽  
Bundle Adjustment ◽  
Surface Strain ◽  
Forming Process ◽  
Epipolar Constraint ◽  
Close Range Photogrammetry ◽  
Close Range

To improve efficiency and automation of the 3D full-field surface strain measurement for sheet metal forming, a new grid strain measuring scheme was developed based on the close-range photogrammetry technology. A Local Canny Detector algorithm was proposed for grid nodes and coded targets detection. A 10-parameters nonlinear camera model and the bundle adjustment algorithm were used to optimize the calibration parameters. A multi-epipolar constraint method was employed for grid node matching. Finally, the surface strains were calculated according to the changes of the grid sizes. To evaluate the performance of the proposed scheme, a stamping forming experiment was conducted. Experimental results show that the scheme can provide a non-contact, intuitive and effective solution for strain measurement in sheet metal forming process.

scholarly journals A Study on Sheet Metal Forming Analysis for Bladder Press

2015 ◽  
Vol 17 (2) ◽  
pp. 379-384
Author(s):  
안국찬 ◽  
김문경 ◽  
유창용 ◽  
Bonghwan Kim
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Analysis
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