Effect of triaxiality on void growth and coalescence in model materials investigated by X-ray tomography |
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Authors: | Akihide Hosokawa David S Wilkinson Jidong Kang Eric Maire |
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Affiliation: | 1. McMaster University, Department of Materials Science and Engineering, 1280 Main Street West, Hamilton, ON, Canada L8S 4L7;2. CANMET-Materials Technology Laboratory, 183 Longwood Road South, Hamilton, ON, Canada L8P 0A5;3. Universit de Lyon, INSA-Lyon, MATEIS CNRS UMR5510, 7 Avenue Jean Capelle, F-69621 Villeurbanne Cedex, France |
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Abstract: | Void growth and coalescence/linkage, which play significant roles during ductile fracture processes, are strongly influenced by stress triaxiality in a deforming solid. The stress state can be changed by cutting notches in a tensile sample. In the current paper, void growth and linkage of an artificial void array embedded in a notched model material was studied by X-ray computed tomography, coupled with in situ tensile deformation. The cross-sectional shape of the tensile specimens was square, and a pair of notches was cut along only one direction. Thus, the lateral principal stress does not have an isotropic distribution: the principal stress along the notch direction is considered to be higher. This technique allowed us to explore the entire process of growth and linkage events of a void array embedded in a metal matrix. The notch effect creates a marked acceleration in void growth, leading to a large reduction in the linkage strains, as compared with similarly fabricated unnotched samples. The standard models for coalescence could not provide consistent predictions of the measured notch effect. |
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