Abstract
In this paper, a strain measurement system for sheet metal forming by digital image processing technology and its fabrication process are presented. The principle strains as well as forming limit diagram can be obtained by using the proposed system. There are tow different approaches, namely the total least square optimization method and the multiple regression analysis method are studied. Comparing to the total least square optimization method, the multiple regression analysis method is simpler and faster within reasonable accuracy. The plastic strains of deformed parts are calculated based on the non-deformed reference configuration being a circle and the deformed configuration being a curve-fitting ellipse. The strain measurement of sheet metal forming is very important and useful. For example, it can be used to construct forming strain rate and temperature. The measurement result scan also be used to verify the numerical simulation results, such as finite element analysis. In the final of the paper, one industrial case study of fine stamping electronic part is discussed to demonstrate the prosed methodology.
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