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Abstract：
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In order to precisely predict edge forming failure of advanced high strength steels, the method of combining for experiment and simulation was adopted, and the cylindrical punch hole expanding test was conducted based on DIC method. Then, the edge forming limit of advanced high strength steel DP980 material was simulated and predicted by software Dynaform based on three fracture failure criteria, and the simulation results were compared with test results. The results show that the limit state of hole expanding is obtained accurately by DIC method, and the hole expansion rate is gained online to improve the efficiency and accuracy of measurement for the hole expansion ratio greatly. Then, the distributions of major and minor strains for hole expanding predicted by Swift isotropic strengthen model and Hill1948 yield model are close to the test results along the rolling direction, but there are some differences along the transverse direction. Furthermore, the data of hole expansion ratio are compared, the predicted hole expansion ratio is close to the test result by the maximum failure strain criterion, and the predicted result using the traditional FLC curve deviates greatly from the test result, so the traditional FLC curve cannot be used as an effective criterion for edge forming failure.
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Funds：
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国家重点研发计划项目（2017YFB0304403）
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AuthorIntro：
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赵广涛（1986-），男，硕士，工程师，E-mail：zhaoguangtao@baosteel.com
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Reference：
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