To forecast the modification and evolution of a residual stress field in a butt-welded plate, the residual stress field was numerically evaluated by a finite element method code. The plate was originated by welding an...To forecast the modification and evolution of a residual stress field in a butt-welded plate, the residual stress field was numerically evaluated by a finite element method code. The plate was originated by welding and suffered after chip- forming machining. The residual stress field was taken as a pre-stress condition for the next cutting simulations. Residual stress distribution after machining was then compared to that in the initial residual stress field. Numerical results have been compared to experimental measurements. That shows the potentiality as well as the limitations of numerical techniques. Three major contributions are summarized as follows ： Longitudinal residual stress distribution in welded plates is deeply changed by mechanical tooling; Planing and cutting increases peak values of transversal residual stress and in general introduces some unevenness in distribution along X-direction; Comparison of experimental and numerical values is generally satisfactory for longitudinal residual stress.展开更多
By using the hypothesis of the deformation of the straight bar and beam in mechanics of materials,a new engineering calculating model for a linear inclusion in plane is presented.Through the Kelvin's solution of a...By using the hypothesis of the deformation of the straight bar and beam in mechanics of materials,a new engineering calculating model for a linear inclusion in plane is presented.Through the Kelvin's solution of a concentrated force,the inclusion problem is reduced to solving a set of uncoupled singular integral equations which can be solved by the numerical method of singular integral equation.Based on these results,several applicable examples including an inclusion-crack problem are calculated and the results are quite satisfactory.展开更多
To predict the behavior of geogrids embedded in sand under pullout loading conditions, the two dimensional plane-stress finite element model was presented. The interactions between soil and geogrid were simulated as ...To predict the behavior of geogrids embedded in sand under pullout loading conditions, the two dimensional plane-stress finite element model was presented. The interactions between soil and geogrid were simulated as non-linear springs, and the stiffness of the springs was determined from simple tests in the specially designed pullout box. The predicted behavior of the geogrid under pullout load agrees well with the observed data including the load-displacement properties, the displacement distribution along the longitudinal direction and the mobilization of the frictional and bearing resistance. (Edited author abstract) 8 Refs.展开更多
文摘To forecast the modification and evolution of a residual stress field in a butt-welded plate, the residual stress field was numerically evaluated by a finite element method code. The plate was originated by welding and suffered after chip- forming machining. The residual stress field was taken as a pre-stress condition for the next cutting simulations. Residual stress distribution after machining was then compared to that in the initial residual stress field. Numerical results have been compared to experimental measurements. That shows the potentiality as well as the limitations of numerical techniques. Three major contributions are summarized as follows ： Longitudinal residual stress distribution in welded plates is deeply changed by mechanical tooling; Planing and cutting increases peak values of transversal residual stress and in general introduces some unevenness in distribution along X-direction; Comparison of experimental and numerical values is generally satisfactory for longitudinal residual stress.
基金The project supported by National Natural Science Foundation of China.
文摘By using the hypothesis of the deformation of the straight bar and beam in mechanics of materials,a new engineering calculating model for a linear inclusion in plane is presented.Through the Kelvin's solution of a concentrated force,the inclusion problem is reduced to solving a set of uncoupled singular integral equations which can be solved by the numerical method of singular integral equation.Based on these results,several applicable examples including an inclusion-crack problem are calculated and the results are quite satisfactory.
文摘To predict the behavior of geogrids embedded in sand under pullout loading conditions, the two dimensional plane-stress finite element model was presented. The interactions between soil and geogrid were simulated as non-linear springs, and the stiffness of the springs was determined from simple tests in the specially designed pullout box. The predicted behavior of the geogrid under pullout load agrees well with the observed data including the load-displacement properties, the displacement distribution along the longitudinal direction and the mobilization of the frictional and bearing resistance. (Edited author abstract) 8 Refs.
