Milling is one of the main methods for processing titanium alloy.At present,the complex process of milling is usually simulated by finite element method,which often has problems in mesh distortion and mesh reconstruct...Milling is one of the main methods for processing titanium alloy.At present,the complex process of milling is usually simulated by finite element method,which often has problems in mesh distortion and mesh reconstruction.Therefore,a meshless three-dimensional milling simulation model was established for TC4 titanium alloy using the smooth particle hydrodynamics(SPH)method.Firstly,the established SPH model was analyzed by the LS-DYNA software,and the stress distribution,temperature field,and cutting force during milling were studied under specific conditions.Subsequently,the cutting force was simulated under different cutting parameters and the effects of these parameters on the cutting force were determined.Finally,based on a series of cutting force experiments,the accuracy of the simulation model was verified.This study proves the feasibility of SPH method in the simulation of titanium alloy milling process and provides novel methods for investigating the processing mechanism and optimizing the processing technology of titanium alloys.展开更多
Understanding the cracking process of layered tunnels requires a high-fidelity method.Improved smooth particle hydrodynamics(SPH),termed kernel broken SPH(KBSPH),was implemented to simulate the crack propagation and d...Understanding the cracking process of layered tunnels requires a high-fidelity method.Improved smooth particle hydrodynamics(SPH),termed kernel broken SPH(KBSPH),was implemented to simulate the crack propagation and deformation of layered rock cells and field layered tunnels with dip angles of 0°–90°,and the results were compared with those of the laboratory tests.Three attempts,including the bedding angle,interlayer distance,and lateral pressure coefficient,were made to investigate the crack propagation and deformation of layered tunnels.Finally,the pros and cons of the KBSPH method applied in the rock field were compared with those of other methods.The results indicate that the KBSPH can explicitly reproduce crack propagation by improving the kernel function with a totally damaged symbol,and the deformation responses have been captured reasonably.We infer that this method is effective and rapid in crack propagation and large deformation simulation for other types of rock tunnels.展开更多
文摘Milling is one of the main methods for processing titanium alloy.At present,the complex process of milling is usually simulated by finite element method,which often has problems in mesh distortion and mesh reconstruction.Therefore,a meshless three-dimensional milling simulation model was established for TC4 titanium alloy using the smooth particle hydrodynamics(SPH)method.Firstly,the established SPH model was analyzed by the LS-DYNA software,and the stress distribution,temperature field,and cutting force during milling were studied under specific conditions.Subsequently,the cutting force was simulated under different cutting parameters and the effects of these parameters on the cutting force were determined.Finally,based on a series of cutting force experiments,the accuracy of the simulation model was verified.This study proves the feasibility of SPH method in the simulation of titanium alloy milling process and provides novel methods for investigating the processing mechanism and optimizing the processing technology of titanium alloys.
基金supported by the National Key Research and Development Program of China(Grant No.2019YFC1509702)the National Natural Science Foundation of China(Grant Nos.41731283,42007252).
文摘Understanding the cracking process of layered tunnels requires a high-fidelity method.Improved smooth particle hydrodynamics(SPH),termed kernel broken SPH(KBSPH),was implemented to simulate the crack propagation and deformation of layered rock cells and field layered tunnels with dip angles of 0°–90°,and the results were compared with those of the laboratory tests.Three attempts,including the bedding angle,interlayer distance,and lateral pressure coefficient,were made to investigate the crack propagation and deformation of layered tunnels.Finally,the pros and cons of the KBSPH method applied in the rock field were compared with those of other methods.The results indicate that the KBSPH can explicitly reproduce crack propagation by improving the kernel function with a totally damaged symbol,and the deformation responses have been captured reasonably.We infer that this method is effective and rapid in crack propagation and large deformation simulation for other types of rock tunnels.
