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RISS 인기검색어
- 검색키워드
- 저자 : Mugendiran V. (검색결과 1 건)
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Mugendiran V.,A. Gnanavelbabu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6
In this study, a surface based strain measurement was used to determine the formability of the sheet metal. A strain measurement mayemploy manual calculation of plastic strains based on the reference circle and the deformed circle. The manual calculation method has agreater margin of error in the practical applications. In this paper, an attempt has been made to compare the formability by implementingthree different theoretical approaches: Namely conventional method, least square method and digital based strain measurements. As thesheet metal was formed by a single point incremental process the etched circles get deformed into elliptical shapes approximately, imageacquisition has been done before and after forming. The plastic strains of the deformed circle grids are calculated based on the nondeformedreference. The coordinates of the deformed circles are measured by various image processing steps. Finally the strains obtainedfrom the deformed circle are used to plot the forming limit diagram. To evaluate the accuracy of the system, the conventional, leastsquare and digital based method of prediction of the forming limit diagram was compared. Conventional method and least square methodhave marginal error when compared with digital based processing method. Measurement of strain based on image processing agrees welland can be used to improve the accuracy and to reduce the measurement error in prediction of forming limit diagram.
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