کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
809624 1468710 2013 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of the subcritical crack growth parameters in rocks using the constant stress-rate test
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Determination of the subcritical crack growth parameters in rocks using the constant stress-rate test
چکیده انگلیسی

Subcritical crack growth plays an important role in evaluating the long-term stability of structures in rocks. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity. This paper presents the results of studies conducted to validate the constant stress-rate test for determining subcritical crack growth parameters in rocks, compared with the conventional testing method, the double torsion test. Various types of specimens including the Brazilian disk, three-point bending, grooved disk, single edge notched bend, and compact tension specimens have been tested on Coconino sandstone under the constant stress-rate scheme and the subcritical crack growth parameters have been determined. The results of the constant stress-rate test are in good agreement with the results of double torsion test. More importantly, the stress-rate tests can determine the parameter A with a much smaller standard deviation than the DT test. Thus the constant stress-rate test seems to be a valid test method for rocks. The results show that the parameter n is almost constant regardless of the test method and specimen geometry, but the parameter A varies with the test method and specimen geometry.


► Validated the constant stress-rate test for Mode I subcritical crack growth.
► The results are in good agreement with the results of the double torsion test.
► The stress-rate test can more accurately determine the parameter A.
► The stress rate test can be used for Modes II and III subcritical crack growth.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 59, April 2013, Pages 166–178
نویسندگان
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