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Comparison of Different Surface Strain Measurement Methods Used for Deformed Sheet Metal Parts
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English
Abstract
A recently developed automated method for measuring surface strains on a deformed three dimensional part is compared with a careful manual measurement method and the differences are discussed. The overall experimental procedure consisted of marking the sheet steel surface with square grids, forming them into different shapes, and measuring surface strains by the two different methods. The manual method involved measuring the distances in each square using a traveling microscope. The automated method is based on digital image processing techniques and is capable of measuring strain distributions over an area of interest. The measured results from both methods agree reasonably well, but some discrepancies are observed at locations where strains are localized.
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Citation
Kapij, M., Moleski, J., Ohwue, T., Vogel, J. et al., "Comparison of Different Surface Strain Measurement Methods Used for Deformed Sheet Metal Parts," SAE Technical Paper 920436, 1992, https://doi.org/10.4271/920436.Also In
References
- Hecker S. S. Ghosh A. K. “The Forming of Sheet Metal,” Sci. American 235 1976 100 108
- Dinda S. James K. F. Keeler S. P. Stine P. A. “How to Use Circle Grid Analysis for Die Tryout,” American Society for Metals 1981 Metals Park, OH
- Taylor B. “Formability Testing of Sheet Metals,” Metals Handbook Ninth 14 ASM International 1988 877 899
- Keeler S. P. “Determination of Forming Limits in Automotive Stampings,” Sheet Metal Industries 42 1965 683 691
- Goodwin G. M. “Application of Strain Analysis to Sheet Metal Forming Problems in the Press Shop,” La Metallurgica 60 1968 767 774
- Lee D. Majlessi S. A. Vogel J. H. -Process Modeling and Simulation for Sheet Forming,- The New Metals Handbook Ninth 14 Forming and Forging Semiatin S. L. et al. ASM International Metals Park, OH 1988 911 927
- Lee D. “The Nature of Chip Formation in Orthogonal Machining,” J. Eng. Mat. Tech., Trans. ASME 106 1984 9 15
- Ayres R. Brewer E. G. Holland S. W. “Grid Circle Analyzer: Computer Aided Measurement of Deformation,” Transactions SAE 88 3 1979 2630 2634
- Harvey D. N. “Optimizing Patterns and Computational Algorithms for Automated, Optical Strain Measurement in Sheet Metal,” Proceedings of the 13th Biennial Congress Melbourne, Australia IDDRG Feb. 1984 403 414
- Vogel J. H. Lee D. “An Automated Two-View Method for Determining Strain Distributions on Deformed Surfaces,” J. Mat. Shaping Technol. 1989
- Vogel J. H. Lee D. “An Automated Method of Measuring Strains from Three-Dimensional Deformed Surfaces,” J. Metals 1989
- Zaverl, F. Jr. “Effect of Deformation History on the Mechanical Behavior and Formability of Sheet Metal,” Ph.D. Thesis at Rensselaer Polytechnic Institute Dec. 1982 RPI Troy, NY
- Sowerby R. Duncan J. L. Chu E. “The Modelling of Sheet Metal Stampings,” International Journal of Mechanical Science 28 1986 415 430