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首页> 外文期刊>Engineering Fracture Mechanics >Instability of rapidly accelerating rupture fronts in nanostrips of monolayer hexagonal boron nitride
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Instability of rapidly accelerating rupture fronts in nanostrips of monolayer hexagonal boron nitride

机译：单层六边形氮化物纳秒快速加速破裂前沿的不稳定性

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摘要

A molecular structural mechanics model of monolayer hexagonal boron nitride is constructed by finite element (FE) method, in which BN bonds are equated with Timoshenko beam elements. Edge crack is introduced in nanostrip of FE model. Crack propagates straight and smoothly under pure opening displacement-loading, and crack speed reaches up to a stable value of 8.45?km/s finally at tensile loading rate 3.33?m/s of both upper and bottom boundaries. While crack branching or kinking occurs beyond critical speeds of 8.74?km/s and 8.71?km/s at higher loading rates of 16.67?m/s and 8.33?m/s respectively, with the formation of non-trivial crack surfaces. The above results are also examined by molecular dynamics models of the same sizes and geometry. Simultaneously, the critical energy release rate is equal to 0.136?TPa·? at a critical tensile strain 8.27% with the occurrences of crack instabilities. Moreover, critical strains of crack initiation 5.75% and branching 8.27% are independent of displacement-loading rates.
机译：单层六方硼氮化物的分子结构力学模型由有限元（Fe）方法构成，其中BN键与Timoshenko梁元件等同。 Fe模型的纳米螺纹裂纹引入。裂缝在纯的开口置换载量下直接且平滑地传播，并且裂缝速度最终达到8.45μm/ s的稳定值，最终在上下边界的拉伸率为3.33Ωm/ s。虽然裂缝分支或扭结的临界速度超出了8.74 km / s和8.71 km / s的缩小速度，其分别以16.67μm/ s和8.33μm/ s的更高的加载速度，形成非普通裂缝表面。还通过相同尺寸和几何形状的分子动力学模型检查上述结果。同时，临界能量释放率等于0.136？TPA·？在临界拉伸菌株8.27％，随着裂缝不稳定性的发生。此外，裂纹引发的临界菌株5.75％和支化8.27％与位移加载率无关。

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  • 来源
    《Engineering Fracture Mechanics》 |2018年第2018期|共10页
  • 作者

    Hong Tian; Xiujin Yang; Gang Yang; Bin Zhang;

  • 作者单位

    State Key Laboratory of Mechanics and Control of Mechanical Structures and College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics;

    State Key Laboratory of Mechanics and Control of Mechanical Structures and College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics;

    State Key Laboratory of Mechanics and Control of Mechanical Structures and College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics;

    State Key Laboratory of Mechanics and Control of Mechanical Structures and College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程力学;
  • 关键词

    Monolayer hexagonal boron nitride; Crack branching and kinking; Finite element; Molecular structural mechanics;

    机译：单层六角形氮化物;裂纹支化和扭结;有限元;分子结构力学;

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