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Mapping Microscale Strain Fields Around a Crack Tip in Molybdenum Via geometric phase analysis and Digital Image Correlation

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Acta Mechanica Solida Sinica 2018年第3期31卷 310-321页

作者： Chunwang Zhao Wencai Li Jijun Li Yongxiang Li Quanlong Liu Lifu Wang Qingyu Hou Yongming Xing College of Science Inner Mongolia University of Technology College of Arts and Sciences Shanghai Maritime University School of Physical Science and Technology Inner Mongolia University

Uniaxial tension tests were conducted on single-edge-notched tensile specimens of pure molybdenum with a mesh grid pattern in front of the notch. A series of images of crack initialization and propagation with a distorted mesh grid pattern were obtained by means of in situ scanning electron microscopy. Strain fields around the crack tip were mapped successively using geometric phase analysis and digital image correlation techniques, and then compared with the predictions obtained through linear elastic fracture mechanics （LEFM）. The comparison shows that the measured strain distribution ahead of the crack tip is consistent with the LEFM predictions of up to 25 μm from the crack tip.

关键词： Crack Strain field geometric phase analysis Digital image correlation

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Quantitative analysis of nanoscale deformation fields of a crack-tip in single-crystal silicon

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Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 1088-1092页

作者： ZHAO ChunWang XING YongMing College of Science Inner Mongolia University of TechnologyHohhot 010051China

A mode II crack in single-crystal silicon was investigated experimentally using high-resolution transmission electron *** phase analysis and numerical moiré method were employed to map the deformation fields of the crack-tip *** normal strain field maps of the crack-tip area indeed showed the deformation occurs primarily in the vicinity of the dislocations and the normal strains are near zero in the crack-tip *** shear strain field map shows that the relatively large shear strain is in the crack-tip *** experimental results were compared with the predictions of linear elastic fracture *** comparison shows that measured strain distribution ahead of the crack-tip agrees with the predictions of linear elastic fracture mechanics up to 1 nm from the crack-tip.

关键词： crack-tip strain high-resolution transmission electron microscopy geometric phase analysis

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