Abstract
The circle grid strain analysis method has hitherto been the most commonly used method to determine strains in sheet metal parts. This method has proved very successful in a number of applications. However, the method has drawbacks, some of which can be overcome by employing a grid strain analysis — the coefficient method — based on the measuring of a grid consisting of squares. The present paper compares the circle grid method and the coefficient method, the conclusions of which comparison are that the coefficient method (i) can yield the strain distribution much faster and more accurately, (ii) is very flexible with respect to choice of optimum reference area, (iii) can be used to analyse the influence of the strain path on the formability of sheet metal, and (iv) is very easy to computerize.
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