In-Situ Observation of Lüders Band Formation in Hot-Rolled Steel via Digital Image Correlation

Metals

Hai Qiu¹  Tadanobu Inoue¹  Rintaro Ueji¹ 

[1] Research Center for Structural Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;

关键词: Lüders band;    Lüders strain;    polycrystalline steel;    tensile test;    digital image correlation;   

DOI  :  10.3390/met10040530

来源: DOAJ

【 摘 要 】

Although the Lüders yield phenomenon has been investigated for more than 150 years, some understanding of Lüders band formation lack substantial support from experimental evidence. In-situ observation of Lüders band formation in hot-rolled steel experimentally clarified the following facts: (i) When stress reaches the true upper yield stress, the Lüders band begins to nucleate. True upper yield stress is greater than nominal upper yield stress. (ii) Gross stress concentration promotes the Lüders band formation, and the size of the gross stress concentration region determines the initial width of the Lüders band. (iii) The Lüders band nucleates far ahead of the gross yield point.

【 授权许可】

Unknown