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| ANALYSIS OF THE LOCALIZATION OF DAMAGE AND THE COMPLETE STRESS-STRAIN RELATION FOR MESOSCOPIC HETEROGENEOUS ROCK UNDER UNIAXIAL TENSILE LOADING | |
| 作者姓名： | 周小平 王建华 张永兴 哈秋聆 |
| 作者单位： | [1]SchoolofCivilEngineering,ChongqingUniversity,Chongqing400045,P.R.China [2]SchoolofCivilEngineeringandMechanics,ShanghaiJiaotongUniversity,Shanghai200030,P.R.China |
| 基金项目： | theNationalNaturalScienceFoundationofChina (598790 1 2,596490 0 8) |
| 摘 要： | The mechanical behavior of rock under uniaxial tensile loading is different from that of rock under compressive loads. A micromechanics-based model was proposed for mesoscopic heterogeneous brittle rock undergoing irreversible changes of their microscopic structures due to microcrack growth. The complete stress-strain relation including linear elasticity, nonlinear hardening, rapid stress drop and strain softening was obtained. The influence of all microcracks with different sizes and orientations were introduced into the constitutive relation by using the probability density function describing the distribution of orientations and the probability density function describing the distribution of sizes. The influence of Weibull distribution describing the distribution of orientations and Rayleigh function describing the distribution of sizes on the constitutive relation were researched. Theoretical predictions have shown to be consistent with the experimental results. |
| 关 键 词： | 岩土力学 局部损伤 局部变形 应力应变关系 单轴张力载荷 |
| 收稿时间： | 15 July 2002 |
Analysis of the localization of damage and the complete stress-strain relation for mesoscopic heterogeneous rock under uniaxial tensile loading |
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| Zhou Xiao-ping Doctor, Associate Professor,Wang Jian-hua,Zhang Yong-xing,Ha Qiu-ling.ANALYSIS OF THE LOCALIZATION OF DAMAGE AND THE COMPLETE STRESS-STRAIN RELATION FOR MESOSCOPIC HETEROGENEOUS ROCK UNDER UNIAXIAL TENSILE LOADING[J].Applied Mathematics and Mechanics(English Edition),2004,25(9):1031-1038. | |
| Authors: | Zhou Xiao-ping Doctor Associate Professor Wang Jian-hua Zhang Yong-xing Ha Qiu-ling |
| Institution: | 1. School of Civil Engineering , Chongqing University,Chongqing 400045, P.R.China; School of Civil Engineering and Mechanics, Shanghai Jiaotong University,Shanghai 200030, P.R.China 2. School of Civil Engineering and Mechanics, Shanghai Jiaotong University,Shanghai 200030, P.R.China 3. School of Civil Engineering , Chongqing University,Chongqing 400045, P.R.China |
| Abstract: | The mechanical behavior of rock under uniaxial tensile loading is different from that of rock under compressive loads. A micromechanics-based model was proposed for mesoscopic heterogeneous brittle rock undergoing irreversible changes of their microscopic structures due to microcrack growth. The complete stress-strain relation including linear elasticity, nonlinear hardening,rapid stress drop and strain softening was obtained. The influence of all microcracks with different sizes and orientations were introduced into the constitutive relation by using the probability density function describing the distribution of orientations and the probability density function describing the distribution of sizes. The influence of Weibull distribution describing the distribution of orientations and Rayleigh function describing the distribution of sizes on the constitutive relation were researched. Theoretical predictions have shown to be consistent with the experimental results. |
| Keywords: | uniaxial tensile loading mesoscopic heterogeneous rock localization of damage and deformation complete stress-strain relation |
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