پديد آورنده :
امرالهي، حميد
عنوان :
مطالعه اثرات هندسه نمونه، توزيع و اندازه دانه ها بر چقرمگي شكست سنگ با استفاده از نتايج آزمايشگاهي و مدلسازي عددي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مكانيك سنگ
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان،دانشكده معدن
صفحه شمار :
ده،132ص.:مصور،جدول،عكس،نمودار
استاد راهنما :
عليرضا باغبان،حميد هاشم الحسيني
استاد مشاور :
لهراسب فرامرزي
توصيفگر ها :
توزيع دانه بندي , نمونه هاي آزمايشگاهي CCNBD ،HCCD
تاريخ نمايه سازي :
11/3/89
استاد داور :
مرتضي احمد،راحب باقرپور
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
131 IUT 77142 Degree Master of Science M Sc Title Effects of Specimen Geometry Grain Size and Distribution on Rock Fracture Toughness Experimentally and Numerically Author Hamid Amrollahi Supervisors Dr A Baghbanan Dr H Hashemalhosseini Department Department of Mining Engineering Date 10 March 2010 Language Persian Abstract Rock fracture toughness a fundamental parameter in rock fracture mechanics describes the intrinsic resistance of rock against initiation and propagation of macroscopic fractures This parameter is used in a wide variety of applications in different fields of rock mechanics Thus measuring accurate and precise value of this parameter is very important However measurement method s of this parameter is still a matter of debate in the literature On the other hand rock properties in microscale are always leading factors in physical mechanical behavior of rock In many cases this relation is properly understood but so far enough insight about how grain size distribution affects fracture toughness is not provided Although experimental tests have a significant role in rock fracture toughness studies numerical techniques in numerous instances show more advantages and capabilities However scanty attempts concerning use of numerical methods in this field are reported In the present research via more than 140 experimental tests fracture toughness of three marbles i e Neiriz Baghat and Maron which are different only in grain size distribution are measured under mode I mixed mode I II and mode II loadings using both Hollow Centre Cracked Disc HCCD and Cracked Chevron Notched Brazilian Disc CCNBD testing specimens Quantification of the marbles grain size distributions is achieved directly from their thin sections Based on determined grain size distributions numerical samples of the marbles are modeled using Distinct Element Method DEM so that macroscopic behaviors from numerical triaxial compressive tests are in agreement with the responses from the tests in laboratory Afterward using these numerical samples fracture toughness tests in the experimental part of the research are simulated Independent from the testing specimen comparison between the marbles results shows that mode I fracture toughness KIC is correlated inversely with grain size For each
استاد راهنما :
عليرضا باغبان،حميد هاشم الحسيني
استاد مشاور :
لهراسب فرامرزي
استاد داور :
مرتضي احمد،راحب باقرپور
