层状板岩断口分形与裂纹扩展速率研究
发布时间：2019-06-16 13:17
【摘要】：为探讨裂纹演化过程中材料形貌与力学参数的关系,采用Talysurf CLI 2000三维激光形貌仪对层状岩样双扭试件断口形貌进行了扫描分析,结果表明,分形维数能较好地表述裂纹扩展形成的断口断面;利用轮廓线分形维数D~2对裂纹真实扩展长度进行计算,结果表明,测度对确定裂纹实际扩展长度影响较大,且D~2值越大,扩展长度对测度变化越敏感。运用Paris公式推导了与速率有关的应力强度因子K_Ⅰ的分形模型,结果表明,D~2与K_Ⅰ的指数参数n线性拟合较理想。
[Abstract]:In order to investigate the relationship between material morphology and mechanical parameters in the process of crack evolution, the fracture morphology of double torsional specimen of layered rock sample was scanned and analyzed by Talysurf CLI 2000 three-dimensional laser topography instrument. The results show that the fractal dimension can well express the fracture section formed by crack propagation. The fractal dimension D 鈮，
本文编号：2500591
[Abstract]:In order to investigate the relationship between material morphology and mechanical parameters in the process of crack evolution, the fracture morphology of double torsional specimen of layered rock sample was scanned and analyzed by Talysurf CLI 2000 three-dimensional laser topography instrument. The results show that the fractal dimension can well express the fracture section formed by crack propagation. The fractal dimension D 鈮，
本文编号：2500591
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