Abstract
Abstract An in-plane stretch bending test for metal strips has been developed as a new stretch flangeability testing method. The in-plane stretch bending tests were performed using several high-strength steel (HSS) sheets and forming limit strains at the outer edge of the bent strips were measured. The experimental results were compared with those of the conventional hole-expansion test. The stretch flangeability in the in-plane stretch bending test was found to be lower than that of the hole-expansion test using conical punches. It was also found that the forming limit strain at the sheet edge linearly increased with increasing the strain gradient around the edge in the both tests. It should be emphasized that the conventional limit hole expansion ratio does not necessarily represent the stretch flangeability in the in-plane stretch bending.
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