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Incorporating size effect into a micromechanical model for brittle materials

机译：将尺寸效应纳入脆性材料的微机械模型

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摘要

This research addresses computational modeling of the size effect in brittle materials, a phenomenon commonly seen in laboratory tests but has not been adequately accounted for in computational models for such materials. Size effect is accounted for in this research by extending a damage model for brittle materials (the DCA model), which is based on the consideration of micromechanics of defects in the materials. In particular, the statistical distribution of the defects in a brittle material is assumed to vary with the size of the material sample under consideration. The idea has been numerically implemented in the DCA model and applied to sea ice, a quasi-brittle material of considerable importance for many applications (e.g., design of offshore structures). The numerical results of the size effect in sea ice are presented and compared with the results given by an empirical model (ISO-19906), which has been widely used in the design of offshore structures. Comparisons show that the size effect predicted by the extended model agrees well with that given by ISO-19906. As the model is based on the micromechanics of material defects, results of this research provide a mechanics basis for ISO-19906, which is purely empirical.
机译：这项研究针对的是脆性材料中尺寸效应的计算模型，这种现象在实验室测试中很常见，但在此类材料的计算模型中并未得到充分考虑。在本研究中，通过扩展脆性材料的损伤模型（DCA模型）来考虑尺寸效应，该模型基于对材料中缺陷的微观力学的考虑。特别地，假定脆性材料中缺陷的统计分布随所考虑的材料样本的大小而变化。这个想法已经在DCA模型中得到了数值实现，并应用于海冰，这是一种准脆性材料，对许多应用（例如，海上结构的设计）都具有重要意义。介绍了海冰中尺寸效应的数值结果，并将其与经验模型（ISO-19906）给出的结果进行了比较，该模型已广泛用于海上结构的设计中。比较表明，扩展模型预测的尺寸效果与ISO-19906给出的尺寸效果非常吻合。由于该模型基于材料缺陷的微观力学，因此这项研究的结果为ISO-19906（纯粹是经验性的）提供了力学基础。

著录项

  • 作者

    Roush, Wm. Patrick.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Mechanical engineering.
  • 学位 M.S.E.
  • 年度 2014
  • 页码 63 p.
  • 总页数 63
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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