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논문 기본 정보

자료유형
학술저널
저자정보
Omid Majidi (Pohang University of Science and Technology) Frederic Barlat (Pohang University of Science and Technology) Yannis P. Korkolis (University of New Hampshire) Jiawei Fu (Pohang University of Science and Technology) Myoung-Gyu Lee (Korea University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.6
발행연도
2016.1
수록면
968 - 973 (6page)

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초록· 키워드

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To understand the material behavior during non-monotonic loading, uniaxial tension tests were conducted inthree modes, namely, the monotonic loading, loading with periodic relaxation and periodic loading-unloadingreloading,at different strain rates (0.001/s to 0.01/s). In this study, the temperature gradient developing duringeach test and its contribution to increasing the apparent ductility of DP780 steel sheets were considered. In order toassess the influence of temperature, isothermal uniaxial tension tests were also performed at three temperatures(298 K, 313 K and 328 K (25 °C, 40 °C and 55 °C)). A digital image correlation system coupled with an infraredthermography was used in the experiments. The results show that the non-monotonic loading modes increasedthe apparent ductility of the specimens. It was observed that compared with the monotonic loading, the temperaturegradient became more uniform when a non-monotonic loading was applied.

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