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周小平, Xiao-ping Zhou*
International Journal of Solids and Structures 41(2004)1725-1738,-0001,():
-1年11月30日
Stress redistribution induced by excavation results in the tensile zone in parts of the surrounding rock mass. It is significant to analyze the localization of deformation and damage, and to study the complete stress-strain relation for mesoscopic heterogeneous rock under dynamic uniaxial tensile loading. On the basis of micromechanics, the complete stress-strain relation including linear elasticity, nonlinear hardening, rapid stress drop and strain softening is obtained. The behaviors of rapid stress drop and strain softening are due to localization of deformation and damage. The constitutive model, which analyze localization of deformation and damage, is distinct from the conventional model. Theoretical predictions have shown to consistent with the experimental results.
Dynamic uniaxial tensile loading, Mesoscopic heterogeneous rock, Micromechanics, Localization of damage and deformation, The complete stress-strain relation
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周小平, Xiaoping Zhou a, b, *, Qiuling Ha c, Yongxing Zhang a, Keshan Zhu a
International Journal of Rock Mechanics & Mining Sciences 41 (2004) 311-319,-0001,():
-1年11月30日
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【期刊论文】A New Fracture Criterion for a Crack under Combined Mode Loading
周小平, ZHOU Xiao-ping, (周小平), WANG Jian-hua(王建华)
Journal of Shanghai Jiaotong University, Vol.E-8, No.1, 2003, 89~91,-0001,():
-1年11月30日
A new fracture criterion was proposed. The physical explanation of the criterion is that crack will propa-gate when the minimum strain energy-density in iso-hoop-stress curve reach a critical strength of the material con-sidered. The resulting curve of critical fracture of mixed-mode cracks shows that the present fracture is efficient and more accurate than the previous criteria.
fracture criterion, combined mode loading, minimum strain energy-density in iso-hoop-stress curve
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周小平, ZHOU Xiao-ping*(周小平), WANG Jian-hua(王建华), HUANG Yu-bin(黄煜镔)
Journal of Shanghai Jiaotong University, Vol.E28, No.2, 2003, 115~117,-0001,():
-1年11月30日
The near crack line analysis method was used to investigate a crack loaded by a pair of point shear forces in an infinite plate in an elastic-perfectly plastic solid. The analytical solution was obtained, that is the elastic-plas-tic fields near crack line and law that the length of the plastic zone along the crack line is varied with external loads. The results are sufficiently precise near the crack line and are not confined by small scale yielding condi-tions.
near crack line, elastic-plastic analysis, a pair of point shear forces
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