【摘要】：為探討裂紋演化過程中材料形貌與力學(xué)參數(shù)的關(guān)系,采用Talysurf CLI 2000三維激光形貌儀對層狀巖樣雙扭試件斷口形貌進行了掃描分析,結(jié)果表明,分形維數(shù)能較好地表述裂紋擴展形成的斷口斷面;利用輪廓線分形維數(shù)D~2對裂紋真實擴展長度進行計算,結(jié)果表明,測度對確定裂紋實際擴展長度影響較大,且D~2值越大,擴展長度對測度變化越敏感。運用Paris公式推導(dǎo)了與速率有關(guān)的應(yīng)力強度因子K_Ⅰ的分形模型,結(jié)果表明,D~2與K_Ⅰ的指數(shù)參數(shù)n線性擬合較理想。
[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，

本文編號：2500591