Antiplane multiple curved crack problem in circular inclusion and matrix material is considered. In order to solve the proposed problem, two kinds of elementary solutions corresponding to a point screw dislocation in ...Antiplane multiple curved crack problem in circular inclusion and matrix material is considered. In order to solve the proposed problem, two kinds of elementary solutions corresponding to a point screw dislocation in inclusion and matrix material respectively are presented. Utilizing the elementary solutions and taking the density of dislocation along cracks surfaces as unknown functions, by the principle of superposition, a group of weakly singular integral equations with log kernels can be obtained. After the numerical solution of the integral equations, the discrete values of dislocation density are obtainable. So stress intensity factors at the cracks tips can be calculated, and several numerical examples are given.展开更多
Based on an essential assumption of meso-heterogeneity of material, the macro characteristic of composite reinfiorced with particles, the crack initiation, propagation and the failure process in composite were studied...Based on an essential assumption of meso-heterogeneity of material, the macro characteristic of composite reinfiorced with particles, the crack initiation, propagation and the failure process in composite were studied by using a numerical code. The composite is subjected to a uniaxial tension, aact stiff or soft particles are distributed at random manner but without overlapping or contacting. The effect of reinforcement particle properties on the fracture process aact mechanism of composite with brittle matrix, furthermore, the influence of the particle volumetric fraction is also investigated. Numerical results present the different failure mode and re-produce the crack initiation, propagation aurl coalescence in brittle aurl heterogeneons matrix. The mechanism of sach failure was also elucidated.展开更多
The near crack line field analysis method has been used io investigate into theexact elastic-plastic solutions of a mode II crack under plane stress condilion in anelastic-perfectly plastic solid. The assumptions of t...The near crack line field analysis method has been used io investigate into theexact elastic-plastic solutions of a mode II crack under plane stress condilion in anelastic-perfectly plastic solid. The assumptions of the usual small scale yielding theory.hare been completely. dbandoned and the correct formulations of matching conditionsat the elaslic-plastic boundary. have been given. By, matching the general solution ofthe plastic slress field (bul not the special solution used to be adopted) with the exactelastic stress field (but not the crack tip K-dominant field) at the elastic-plasticboundary, near the crack line, the plastic stresses. the length of the plastic =one and theunit normal vector of the elastic-plastic boundary.which are sufficiently precise near the crack line region ,have been given.展开更多
文摘Antiplane multiple curved crack problem in circular inclusion and matrix material is considered. In order to solve the proposed problem, two kinds of elementary solutions corresponding to a point screw dislocation in inclusion and matrix material respectively are presented. Utilizing the elementary solutions and taking the density of dislocation along cracks surfaces as unknown functions, by the principle of superposition, a group of weakly singular integral equations with log kernels can be obtained. After the numerical solution of the integral equations, the discrete values of dislocation density are obtainable. So stress intensity factors at the cracks tips can be calculated, and several numerical examples are given.
文摘Based on an essential assumption of meso-heterogeneity of material, the macro characteristic of composite reinfiorced with particles, the crack initiation, propagation and the failure process in composite were studied by using a numerical code. The composite is subjected to a uniaxial tension, aact stiff or soft particles are distributed at random manner but without overlapping or contacting. The effect of reinforcement particle properties on the fracture process aact mechanism of composite with brittle matrix, furthermore, the influence of the particle volumetric fraction is also investigated. Numerical results present the different failure mode and re-produce the crack initiation, propagation aurl coalescence in brittle aurl heterogeneons matrix. The mechanism of sach failure was also elucidated.
文摘The near crack line field analysis method has been used io investigate into theexact elastic-plastic solutions of a mode II crack under plane stress condilion in anelastic-perfectly plastic solid. The assumptions of the usual small scale yielding theory.hare been completely. dbandoned and the correct formulations of matching conditionsat the elaslic-plastic boundary. have been given. By, matching the general solution ofthe plastic slress field (bul not the special solution used to be adopted) with the exactelastic stress field (but not the crack tip K-dominant field) at the elastic-plasticboundary, near the crack line, the plastic stresses. the length of the plastic =one and theunit normal vector of the elastic-plastic boundary.which are sufficiently precise near the crack line region ,have been given.
