A numerical and experimental investigation has been made of the strain-concentration factors K at the corners of stretched rectangular rubber sheets having a wide range of length/width ratio, for corner curves of various shapes and sizes. It was found that K is approximately inversely proportional to the cube root of the relative size of the curve, and that elliptic corner curves are better than sine curves. Undercutting is deleterious, but corner wedges with angles of less than 45° have zero strain at the corner. K generally decreases with increasing nominal strain.
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