We report a combined experimental and computational study of a low constraint aluminum single crystal fracture geometry and investigate the near-tip stress and strain fields. To this end, a single edge notched tensile (SENT) specimen is considered. A notch, with a radius of , is taken to lie in the (010) plane and its front is aligned along the  direction. Experiments are conducted by subjecting the specimen to tensile loading using a special fixture inside a scanning electron microscope chamber. Both SEM micrographs and electron back-scattered diffraction (EBSD) maps are obtained from the near-tip region. The experiments are complemented by performing 3D and 2D plane strain finite element simulations within a continuum crystal plasticity framework assuming an isotropic hardening response characterized by the Pierce–Asaro–Needleman model. The simulations show a distinct slip band forming at about with respect to the notch line corresponding to slip on system, which corroborates well with experimental data. Furthermore, two kink bands occur at about and with respect to the notch line within which large rotations in the crystal orientation take place. These predictions are in good agreement with the EBSD observations. Finally, the near-tip angular variations of the 3D stress and plastic strain fields in the low constraint SENT fracture geometry are examined in detail.
Crack Tip Fields in a Single Edge Notched Aluminum Single Crystal Specimen
Patil, S. D., Narasimhan, R., Biswas, P., and Mishra, R. K. (March 13, 2008). "Crack Tip Fields in a Single Edge Notched Aluminum Single Crystal Specimen." ASME. J. Eng. Mater. Technol. April 2008; 130(2): 021013. https://doi.org/10.1115/1.2884330
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