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Fractal Characteristics of Transverse Crack Propagation on CRTSII Type Track Slab

机译：CRTSII型轨道板上横裂化横裂繁殖的分形特征

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摘要

Objectives of this study are to examine influence of the surface crackles fractal characteristics of CRTSII track slab on its propagation velocity and stress intensity factor (SIF) and to improve the service performance of track slab. In this paper, fractal dimension D of transverse crack on the surface of CRTSII track slab was calculated by image processing, digital image technology, and box-counting method. Based on the fractal structure of transverse crack on track slab surface, a fractal transverse crack propagation model was established. The impact of fractal effect on the surface crack propagation velocity and SIF of CRTSII track slab was analyzed quantitatively. The fractal dimension D of transverse crack is 1.0652 on the surface of CRTSII track slab. The actual measured crack propagation velocity V0 on the surface of the track slab can be corrected as the true crack propagation velocity V. When the V0/Cr=0.8991, the SIF K ' L1.0652,t,V of transverse dynamic fractal crack propagation on the surface of track slab has been equal to 0, and the V0 is always lower than Rayleigh wave velocity. In addition, the true attenuation rate of SIF for CRTSII track slab surface transverse dynamic crack propagation is faster than the actual measured value.
机译：本研究的目的是检查CRTSII轨道板的表面裂纹分形特性对其传播速度和应力强度因子（SIF）的影响，提高轨道板的服务性能。本文通过图像处理，数字图像技术和箱数法计算CRTSII轨道板表面横向裂纹的分形尺寸D.基于轨道平板表面横裂缝的分形结构，建立了分形横裂裂纹传播模型。定量分析了分形对CRTSII轨道板表面裂纹传播速度和SIF的影响。 CRTSII轨道板坯表面的横向裂纹的分形尺寸D为1.0652。轨道板的表面上的实际测量裂缝传播速度V0可以被校正为真正的裂纹传播速度V.当V0 / Cr = 0.899 <1时，SIF K'L1.0652，T，横向动态分形的v轨道板表面上的裂纹传播等于0，并且V0总是低于瑞利波速度。此外，CRTSII轨道板表面横向动态裂纹传播的SIF的真正衰减率比实际测量值快。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第16期|6587343.1-6587343.9|共9页
  • 作者

    He Yue-Lei; Shen Jian-Kang; Li Zai-Wei; Lu Hong-Yao;

  • 作者单位

    Shanghai Univ Engn Sci Sch Urban Transportat Shanghai 201620 Peoples R China;

    Shanghai Univ Engn Sci Sch Urban Transportat Shanghai 201620 Peoples R China;

    Shanghai Univ Engn Sci Sch Urban Transportat Shanghai 201620 Peoples R China;

    Shanghai Univ Engn Sci Sch Urban Transportat Shanghai 201620 Peoples R China;

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