کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7196005 1468305 2018 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study on the dynamic fracture behavior of 3D heterogeneous rocks using General Particle Dynamics
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Numerical study on the dynamic fracture behavior of 3D heterogeneous rocks using General Particle Dynamics
چکیده انگلیسی
The General Particle Dynamics code (GPD) is developed to simulate initiation, propagation and coalescence of cracks in 3D brittle rock specimens subjected to dynamic loads. In GPD, fractures of particles are determined through a damage evolution law of brittle rock materials. An elasto-brittle damage model is employed to reflect the initiation and growth of cracks and the macro-failure of brittle rocks. Numerical examples, including pre-notched semi-circular bending and uniaxial compression testing, have been carried out to verify the applicability of GPD to simulate the dynamic failure of rocks. Results of pre-notched semi-circular bend test show that GPD is capable of realistically simulating the mechanical behavior of rock materials subjected to dynamic loads. Under dynamic uniaxial loadings, the dynamic increment factor increases with increasing strain rate. Failure modes of samples pass from tensile to mixed shear-tension mode with increasing the loading speed. The number of fractions of sample increases with increasing the loading speed. Moreover, the failure mode of samples pass from a typical splitting failure to a mixed mode failure with decreasing heterogeneity coefficient while the number of cracks and fractions increases with decreasing the heterogeneity coefficient. The numerical results obtained from GPD are in excellent agreement with experiments and other numerical methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theoretical and Applied Fracture Mechanics - Volume 96, August 2018, Pages 90-104
نویسندگان
, , , , , ,