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This study validated the methods for the evaluation of stress triaxiality using finite element (FE) simulations. The FE simulations tracing actual mechanical tests demonstrate derived local stress triaxiality at the fracture portion. Conventionally, such numerically derived stress triaxiality identifies ductile fracture loci for advanced high-strength steels (AHSSs). Although the method has been confirmed, the stress evaluation by FE simulations have not been validated by comparing with actual values. Thus, this study conducted the direct measurement of stress triaxiality in the small round-bar tensile tests using synchrotron X-ray diffraction. Two types of AHSSs—dual-phase (DP) and transformation-induced plasticity (TRIP) steels—were used for the study. As an additional advancement of this study, the modified Swift law was introduced to the FE simulations as a work-hardening law to facilitate an accurate prediction of the stress vs. strain curve in the large strain region. Consequently, the numerically simulated stress triaxiality with the modified Swift law agreed well with the measurement for the DP steel. However, the FE simulation did not agree with the measurements for the TRIP steel due to the stress partitioning of the α- and γ-phases, and transformation from the γ- to the α-phases.

権利情報:

• Creative Commons BY Attribution 4.0 International
  Creative Commons BY Attribution 4.0 International

キーワード: Advanced high-strength steel, large strain, stress-triaxiality, small round-bar tensile test, synchrotron X-ray diffraction, finite element simulation

刊行年月日: 2021-01-01

出版者: Informa UK Limited

掲載誌:

• Science and Technology of Advanced Materials: Methods (ISSN: 27660400) vol. 1 issue. 1 p. 56-74

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1080/27660400.2021.1922207

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更新時刻: 2024-01-05 22:12:21 +0900

MDRでの公開時刻: 2023-02-28 11:45:31 +0900