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Size effects on thermomechanical failure of layered structure with generalized particle dynamics multiscale methods

机译:广义粒子动力学多尺度方法对层状结构热力学破坏的尺寸效应

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摘要

Nanoscale models are very small but involve multiple physics, multiscales, confinement, high rates, etc. These make the numerical simulation of intrinsic and extrinsic size effects difficult for the ferrite/cementite layered structure of carbon steel. In this work, a "new" simulation approach is proposed with "hypothesis" as the key to make the on-going simulation simple, physically sound, and the related atomistically based simulation productive. Using this refreshed approach, which is based on the traditional scientific philosophy, size effects that are related to interface structure and the layer thickness on failure due to thermomechanical coupling are investigated. Among interesting findings, it proves that the peak stress in the strain-stress curve as the characteristic parameter to describe the size effects on failure of thermomechanical coupling is not fully accurate, and a multiplication form of energy barrier with fast decaying function of thermal activation energy should be used in the size-dependent failure initiation criterion. This makes developing guidelines available for designing interface sizes at nanoscale.
机译:纳米尺度模型非常小,但涉及多个物理场,多尺度,局限性,高速率等。这使得碳钢的铁素体/渗碳体层状结构的固有和非固有尺寸效应的数值模拟变得困难。在这项工作中,提出了一种以“假设”为关键的“新”模拟方法,以使进行中的模拟简单,物理上合理,并且基于原子的相关模拟富有成效。使用基于传统科学原理的这种更新方法,研究了与界面结构和层厚度有关的尺寸效应,这些效应是由于热机械耦合引起的。在有趣的发现中,证明应变-应力曲线中的峰值应力作为描述热机械耦合失效的尺寸效应的特征参数并不能完全准确,并且是具有热活化能快速衰减功能的能垒的倍增形式应在与尺寸有关的失效启动准则中使用。这使开发指南可用于设计纳米级的界面尺寸。

著录项

  • 来源
    《Journal of Materials Research》 |2019年第13期|2384-2397|共14页
  • 作者

    Fan Jinghong;

  • 作者单位

    IIMMM, Atlanta, GA 30097 USA|Alfred Univ, Kazuo Inamori Sch Engn, Alfred, NY 14802 USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metal; simulation; layered;

    机译:金属;模拟;分层;

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