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Polymer indentation with mesoscopic molecular dynamics

机译：具有介观分子动力学的聚合物压痕

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摘要

Indentation tests are used to determine the hardness of a material, e.g., Rockwell, Vickers, or Knoop. The indentation process is empirically observed in the laboratory during these tests; the mechanics of indentation is insufficiently understood. We have performed first molecular dynamics computer simulations of indentation resistance of polymers with a chain structure similar to that of high density polyethylene (HDPE). A coarse grain model of HDPE is used to simulate how the interconnected segments respond to an external force imposed by an indenter. Results include the time-dependent measurement of penetration depth, recovery depth, and recovery percentage, with respect to indenter force, indenter size, and indentation time parameters. The simulations provide results that are inaccessible experimentally, including continuous evolution of the pertinent tribological parameters during the entire indentation process.
机译：压痕测试用于确定材料的硬度，例如洛氏，维氏或努氏硬度。在这些测试过程中，在实验室中根据经验观察压痕过程。对压痕的机理了解不足。我们已经对分子结构类似于高密度聚乙烯（HDPE）的聚合物的耐压痕性进行了分子动力学计算机模拟。 HDPE的粗粒模型用于模拟互连的段如何响应压头施加的外力。结果包括相对于压头力，压头尺寸和压痕时间参数的穿透深度，恢复深度和恢复百分比的时间依赖性测量。模拟提供了实验上无法获得的结果，包括整个压痕过程中相关摩擦学参数的不断演变。

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  • 来源
    《Journal of Materials Research》 |2013年第21期|3043-3052|共10页
  • 作者

    Javier R. Rocha; Kevin Z. Yang; Travis Hilbig; Witold Brostow; Ricardo Simoes;

  • 作者单位

    Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, Denton, Texas 76207;

    Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, Denton, Texas 76207;

    Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, Denton, Texas 76207;

    Laboratory of Advanced Polymers and Optimized Materials (LAPOM), Department of Materials Science and Engineering and Department of Physics, University of North Texas, Denton, Texas 76207;

    School of Technology, Polytechnic Institute of Cdvado and Ave, Campus do IPCA, 4750-810 Barcelos, Portugal and Institute for Polymers and Composites - IPC/I3N, University ofMinho, Campus de Azurem, 4800-058 Guimaraes, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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