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Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals
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Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals
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Journal Article
Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals
2019
Overview
The failure of polycrystalline materials used in infrastructure and transportation can be catastrophic. Multiscale modeling, which requires multiscale measurements of internal stress fields, is the key to predicting the deformation and failure of alloys. We determined the three-dimensional intragranular stress tensor fields in plastically deformed bulk steel using a high-energy x-ray microbeam. We observed intragranular local stresses that deviated greatly from the grain-averaged stresses and exceeded the macroscopic tensile strength. Even under deformation smaller than the uniform elongation, the intragranular stress fields were in highly triaxial stress states, which cannot be determined from the grain-averaged stresses. The ability to determine intragranular stress tensor fields can facilitate the understanding and prediction of the deformation and failure of materials through multiscale modeling.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
