期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 144, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.103028
关键词
Heterogeneous plastic flow; Plane strain; Slant ductile fracture; Synchrotron laminography; Digital image correlation
资金
- French Agence Nationale de la Recherche [ANR-14-CE07-0034, LAMBDA ANR-17-CE08-0051]
- Research Council of Norway through the FRINATEK Programme [250553]
- NTNU
- Agence Nationale de la Recherche (ANR) [ANR-14-CE07-0034] Funding Source: Agence Nationale de la Recherche (ANR)
Crystallographic aspects of heterogeneous plastic flow during ductile tearing are assessed experimentally by combining in situ synchrotron laminography imaging with numerical simulations using the crystal plasticity finite element method. The study reveals the early onset of slant strained bands which eventually lead to the formation of slant cracks. The simulation results show similar trends to the experimental observations, indicating the stability of the slant strained bands over the loading history.
Crystallographic aspects of heterogeneous plastic flow during ductile tearing are assessed experimentally by combining in situ synchrotron laminography imaging of notched flat samples with a full-field measurement technique and numerical simulations with the crystal plasticity finite element method (CP-FEM). Advantage is taken of the plane strain condition in the region ahead of the notch root (i.e., in the plane normal to the crack propagation direction) to perform two-dimensional image correlation in the material bulk. Intermetallic particles provide image contrast that is registered during the correlation analyses. They reveal the early onset of slant strained bands along which the final slant crack propagated. Two-dimensional plane strain CPFEM simulations using the grain shape and crystallographic orientations of the studied material show the same trends as those observed experimentally, namely, the appearance of early slant strained bands that cross tens of grains and that remain stable over the loading history. The ratio of the strains within and outside the bands is also similar to that observed experimentally.
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