岩土力学2017，Vol.38Issue(1)：214-220,7.DOI:10.16285/j.rsm.2017.01.027
加载方式及抗拉强度对巴西圆盘试验影响的连续-非连续方法数值模拟
Numerical simulation of effects of loading types and tensile strengths on Brazilian disk test by use of a continuum-discontinuum method
摘要
Abstract
Effects of three types of loading,i.e.concentrated loading,plate loading and flattened loading,on the macroscopically mechanical behaviors,tensile strength and cracking processes of Brazilian disks are numerically investigated.The effect of tensile strengths of materials is presented for three kinds of loading types.In addition,the modified coefficients of tensile strength at different loading angles are presented for the flattened Brazilian discs.A continuum-discontinuum method which combines the Lagrangian element method,the deformational discrete element method and the fictitious crack model is adopted.The method can be used to simulate the deformation in the elastic stage and actual cracking of materials.It is found that the flattened loading easily leads to a crack at the center of Brazilian disc,while the concentrated loading or plate loading most likely results in shear failure.When the disk failures at the center,the numerical solution of the concentrated loading is closest to the calculated tensile strength,followed by the plate loading mode,and finally the flattened loading.The materials with low tensile strength normally leads to cracking at the center of the disk for any loading type;otherwise,there is shear failure at two loading ends of the disc.After the disk centrally cracks,a great number of microcracks coalesce to form a band that continuously propagates along the loading direction,and meanwhile the failure is accompanied by stress wave generation and propagation.关键词
巴西圆盘/开裂/抗拉强度/加载板/巴西平台圆盘/集中力/连续-非连续方法/数值模拟Key words
Brazilian disc/cracking/tensile strength/plate/flattened Brazilian disc/concentrated force/continuum-discontinuum method/numerical simulation分类
建筑与水利引用本文复制引用
郭翔,王学滨,白雪元,王春伟,齐大雷..加载方式及抗拉强度对巴西圆盘试验影响的连续-非连续方法数值模拟[J].岩土力学,2017,38(1):214-220,7.基金项目
国家自然科学基金项目(No.51374122) （No.51374122）
辽宁省高等学校优秀人才支持计划(No.LR2015029) （No.LR2015029）
辽宁省科学事业公益研究基金(No.2014003008) （No.2014003008）
高等学校博士点专项科研基金(No.20132121110006)联合资助.This work was supported by the National Natural Science Foundation of China (NSFC) (51574122),the Program for Liaoning Excellent Talents in University (LNET) (LR2015029),the Program for Liaoning Scientific Research Public Welfare Foundation (2014003008) and the Research Fund for the Doctoral Program of Higher Education of China (RFDP) (20132121110006). （No.20132121110006）
