کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
809717 1468722 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measuring fracture toughness of crystalline marbles under modes I and II and mixed mode I–II loading conditions using CCNBD and HCCD specimens
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Measuring fracture toughness of crystalline marbles under modes I and II and mixed mode I–II loading conditions using CCNBD and HCCD specimens
چکیده انگلیسی

Fracture toughness of three crystalline Calcite marbles, which are different only in grain size and distribution, is determined under modes I and II and mixed mode I–II loading conditions using Cracked Chevron-Notched Brazilian Disc (CCNBD) and Hollow Centre Cracked Disc (HCCD) specimens. The results show that mode I fracture toughness (KIC) is correlated negatively with grain size. For each marble, HCCD yields lower values of fracture toughness, compared with CCNBD. This difference is negligible under mode I loading condition; while it becomes larger as loading condition transits from mode I to mode II. Measured values of P-wave velocity (VP), Brazilian tensile strength (σtB) and Schmidt hammer hardness are in direct relation with KIC of the marbles. The obtained results are compared with three fracture criteria, in which the Minimum Strain Energy Density (MSED) criterion has provided better correlations with different critical combinations of modes I and II Stress Intensity Factors.


► In this study we examined the effect of grain size distribution on rock fracture toughness.
► We measured all fracture toughness modes for three crystalline marbles.
► We compare other rock characteristics with fracture toughness.
► Compared to MTS and MERR criteria, MSED criterion provided better correlations with the obtained results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 48, Issue 7, October 2011, Pages 1123–1134
نویسندگان
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