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Related Concept Videos

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Power-law creep from discrete dislocation dynamics.

Shyam M Keralavarma1, T Cagin, A Arsenlis

  • 1Department of Aerospace Engineering, Texas A&M University, College Station, Texas 77843, USA.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

This study simulates dislocation glide and climb in aluminum, revealing "power-law" creep mechanisms. The findings accurately predict experimental creep rates and stress exponents, validating the simulation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Dislocation motion (glide and climb) is fundamental to plastic deformation in crystalline materials.
  • Understanding creep mechanisms, particularly power-law creep, is crucial for predicting material behavior under stress at elevated temperatures.
  • Simulating the interplay between dislocation dynamics and atomic diffusion is computationally challenging.

Purpose of the Study:

  • To investigate the combined effects of dislocation glide and climb on power-law creep.
  • To develop and utilize a simulation framework that couples dislocation motion with vacancy diffusion.
  • To compare simulation predictions with experimental data for creep rates and stress exponents.

Main Methods:

  • Two-dimensional discrete dislocation dynamics (DDD) simulations.
  • Incorporation of vacancy diffusion and its coupling with dislocation movement.
  • Analysis of quasiequilibrium or jammed dislocation states under applied creep stress.

Main Results:

  • Successfully simulated power-law creep in a model aluminum crystal.
  • Observed matter transport via vacancy diffusion coupled with dislocation motion.
  • Simulation predictions for creep rates and stress exponents align with experimental observations.

Conclusions:

  • The simulation approach captures the essential physics of power-law creep.
  • Coupled dislocation glide, climb, and diffusion are key to understanding creep behavior.
  • The model provides a validated framework for studying creep mechanisms in metals.