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Riemann-Cartan Geometry of nonlinear dislocation mechanics

机译:非线性位错力学的Riemann-Cartan几何

摘要

We present a geometric theory of nonlinear solids with distributed dislocations. In this theory the material manifold – where the body is stress free – is a Weitzenbock manifold, i.e. a manifold with a flat affine connection with torsion but vanishing non-metricity. Torsion of the material manifold is identified with the dislocation density tensor of nonlinear dislocation mechanics. Using Cartan’s moving frames we construct the material manifold for several examples of bodies with distributed dislocations. We also present non-trivial examples of zero-stress dislocation distributions. More importantly, in this geometric framework we are able to calculate the residual stress fields assuming that the nonlinear elastic body is incompressible. We derive the governing equations of nonlinear dislocation mechanics covariantly using balance of energy and its covariance.
机译:我们提出了具有分布位错的非线性固体的几何理论。在该理论中,无歧管的材料歧管是Weitzenbock歧管,即具有平直仿射连接且具有扭转力但无度量性消失的歧管。材料歧管的扭转由非线性位错力学的位错密度张量确定。使用Cartan的移动框架,我们为具有分布错位的物体的多个示例构造了物料流形。我们还提出了零应力位错分布的重要例子。更重要的是,在这个几何框架中,我们能够假设非线性弹性体不可压缩而计算残余应力场。我们利用能量平衡及其协方差来协变地推导非线性位错力学的控制方程。

著录项

  • 作者

    Yavari A.; Goriely A.;

  • 作者单位
  • 年度 2011
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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