A void growth model considering the Bauschinger effect(BE)is proposed for ductile materials sustaining impact loading.Numerical simulations of two high-velocity impact problems are carried out by our newly developed E...A void growth model considering the Bauschinger effect(BE)is proposed for ductile materials sustaining impact loading.Numerical simulations of two high-velocity impact problems are carried out by our newly developed Eulerian programs.The proposed model is tested by a plate impact problem and a qualitative agreement with the experiment is obtained.Then a more complicated problem,a plate impacted by a spherical projectile at a velocity of 6.0 km/s,is simulated.The numerical results are in better accordance with the experimental data when the BE is considered.The proposed model reveals that the BE has an obvious effect on the spall process.展开更多
In the present paper, a three-dimensional （3D） Eulerian technique for the 3D numerical simulation of high-velocity impact problems is proposed. In the Eulerian framework, a complete 3D conservation element and solut...In the present paper, a three-dimensional （3D） Eulerian technique for the 3D numerical simulation of high-velocity impact problems is proposed. In the Eulerian framework, a complete 3D conservation element and solution element scheme for conservative hyperbolic governing equations with source terms is given. A modified ghost fluid method is proposed for the treatment of the boundary conditions. Numerical simulations of the Taylor bar problem and the ricochet phenomenon of a sphere impacting a plate target at an angle of 60~ are carried out. The numerical results are in good agreement with the corresponding experimental observations. It is proved that our computational technique is feasible for analyzing 3D high-velocity impact problems.展开更多
基金by the National Natural Science Foundation of China under Grant Nos 10732010,10972010 and 11028206.
文摘A void growth model considering the Bauschinger effect(BE)is proposed for ductile materials sustaining impact loading.Numerical simulations of two high-velocity impact problems are carried out by our newly developed Eulerian programs.The proposed model is tested by a plate impact problem and a qualitative agreement with the experiment is obtained.Then a more complicated problem,a plate impacted by a spherical projectile at a velocity of 6.0 km/s,is simulated.The numerical results are in better accordance with the experimental data when the BE is considered.The proposed model reveals that the BE has an obvious effect on the spall process.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10732010,10972010,and 11332002)
文摘In the present paper, a three-dimensional （3D） Eulerian technique for the 3D numerical simulation of high-velocity impact problems is proposed. In the Eulerian framework, a complete 3D conservation element and solution element scheme for conservative hyperbolic governing equations with source terms is given. A modified ghost fluid method is proposed for the treatment of the boundary conditions. Numerical simulations of the Taylor bar problem and the ricochet phenomenon of a sphere impacting a plate target at an angle of 60~ are carried out. The numerical results are in good agreement with the corresponding experimental observations. It is proved that our computational technique is feasible for analyzing 3D high-velocity impact problems.
