Email this article Nucleation of cracks near the free surface in deformed metallic nanomaterials with a bimodal structure
- Authors: Ovid’ko I.A.1,2,3, Sheinerman A.G.1,2,3
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Affiliations:
- Research Laboratory “Mechanics of New Nanomaterials,”
- Institute of Problems of Mechanical Engineering
- St. Petersburg State University
- Issue: Vol 58, No 6 (2016)
- Pages: 1179-1183
- Section: Mechanical Properties, Physics of Strength, and Plasticity
- URL: https://journal-vniispk.ru/1063-7834/article/view/197797
- DOI: https://doi.org/10.1134/S1063783416060305
- ID: 197797
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Abstract
A theoretical model that effectively describes the nucleation of cracks in stress fields of dislocation pile-ups near the free surface in metallic nanomaterials with a bimodal structure has been developed. The dependences of the critical shear stress τc (for the formation of a crack with an equilibrium length of 10 nm on a dislocation pile-up near the surface) on the size d of a grain containing the dislocation pile-up have been calculated for copper with a bimodal structure. Theoretically, it has been found that the critical shear stress τc for the nucleation of a crack near the free surface in a nanomaterial with a bimodal structure is approximately 30% higher than that for the crack nucleation within the nanomaterial at a distance from the free surface.
About the authors
I. A. Ovid’ko
Research Laboratory “Mechanics of New Nanomaterials,”; Institute of Problems of Mechanical Engineering; St. Petersburg State University
Author for correspondence.
Email: ovidko@nano.ipme.ru
Russian Federation, Politekhnicheskaya ul. 29, St. Petersburg, 195251; Bolshoi pr. 61, St. Petersburg, 199178; Universitetskaya nab. 7–9, St. Petersburg, 199034
A. G. Sheinerman
Research Laboratory “Mechanics of New Nanomaterials,”; Institute of Problems of Mechanical Engineering; St. Petersburg State University
Email: ovidko@nano.ipme.ru
Russian Federation, Politekhnicheskaya ul. 29, St. Petersburg, 195251; Bolshoi pr. 61, St. Petersburg, 199178; Universitetskaya nab. 7–9, St. Petersburg, 199034
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