Title:
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Yielding and irreversible deformation below the microscale: surface effects and non-mean-field plastic avalanches
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Author:
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Moretti, Paolo; Cerruti, Benedetta; Miguel, M. Carmen
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada |
Abstract:
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Nanoindentation techniques recently developed to measure the mechanical response of crystals under external loading
conditions reveal new phenomena upon decreasing sample size below the microscale. At small length scales, material resistance to irreversible deformation depends on sample morphology. Here we study the mechanisms of yield and plastic flow in inherently small crystals under uniaxial compression. Discrete structural rearrangements emerge as a series of abrupt
discontinuities in stress-strain curves. We obtain the theoretical dependence of the yield stress on system size and geometry
and elucidate the statistical properties of plastic deformation at such scales. Our results show that the absence of dislocation
storage leads to crucial effects on the statistics of plastic events, ultimately affecting the universal scaling behavior observed at larger scales. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria -Àrees temàtiques de la UPC::Física::Física de l'estat sòlid::Cristalls -Crystals -- Properties -Nanotechnology--Materials -Nanotecnologia -- Simulació per ordinador -Cristalls -- Propietats plàstiques |
Rights:
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Document type:
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Article - Published version Article |
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