The main purpose of the paper is to obtain the experimental yield loci of TRIP590 advanced high strength steel,and to compare it with the theoretical loci in order to obtain the best yield criterion for this material....The main purpose of the paper is to obtain the experimental yield loci of TRIP590 advanced high strength steel,and to compare it with the theoretical loci in order to obtain the best yield criterion for this material.First,the biaxial loading tests under different loading paths in the method of load control are carried out.Then,the experimental yield loci of different deformation stages are obtained.Finally,the experimental yield loci are compared with the theoretical loci of Mises criterion and Hill48 criterion,the parameters of which are calculated based on the r?value and the yield stress method,respectively.The results show that the accuracy of the theoretical yield loci of Hill48 based on the yield stress is higher than that of Mises criterion and Hill 48 criterion based on r?value method.展开更多
QP980 is an ultra high strength steel.First,uniaxial and biaxial tension tests have been done in different loading paths.Then QP980 basic mechanical properties have been obtained.And the stress and strain graph has be...QP980 is an ultra high strength steel.First,uniaxial and biaxial tension tests have been done in different loading paths.Then QP980 basic mechanical properties have been obtained.And the stress and strain graph has been drawn.Second,according to the equal principle of the unit volume plastics work and yield stress,QP980 plastic work contour map has been drawn.Third,through comparing Mises,Hill'48,Hosford and Barlat89 yield criterion theoretical curves with the experimental plastic work contour map,the result shows that the Hill'48 yield criterion is in good conformity with the QP980 material.Fourth,Hill'48 yield criterion is optimized by introducing an equivalent plastic strain parameter.The result shows that average error of optimized Hill'48 theoretical yield trajectory is reduced by 8.4%.Last,finite element model about variable cross-section roll forming is established,then applying the optimized Hill'48 parameter yield criterion to the ABAQUS for finite element simulation.The simulation result shows that the forming quality is good,and in agreement with the actual forming parts.Therefore,the optimized Hill'48 yield criterion can be used to precisely describe QP980 ultra high strength steel.展开更多
基金supported in part by the National Natural Science Foundation of China (Nos.51775004, 51475003)the Beijing Natural Science Foundation (Nos. 3164041, 3152010)the Beijing Municipal Education Commission Science and Technology Foundation (No. KM201710009005)
文摘The main purpose of the paper is to obtain the experimental yield loci of TRIP590 advanced high strength steel,and to compare it with the theoretical loci in order to obtain the best yield criterion for this material.First,the biaxial loading tests under different loading paths in the method of load control are carried out.Then,the experimental yield loci of different deformation stages are obtained.Finally,the experimental yield loci are compared with the theoretical loci of Mises criterion and Hill48 criterion,the parameters of which are calculated based on the r?value and the yield stress method,respectively.The results show that the accuracy of the theoretical yield loci of Hill48 based on the yield stress is higher than that of Mises criterion and Hill 48 criterion based on r?value method.
基金Supported by the National Natural Science Foundation of China(No.51775004)Beijing Natural Science Foundation(No.3164041)Beijing Municipal Education Commission Science and Technology Foundation(No.KM201710009005)。
文摘QP980 is an ultra high strength steel.First,uniaxial and biaxial tension tests have been done in different loading paths.Then QP980 basic mechanical properties have been obtained.And the stress and strain graph has been drawn.Second,according to the equal principle of the unit volume plastics work and yield stress,QP980 plastic work contour map has been drawn.Third,through comparing Mises,Hill'48,Hosford and Barlat89 yield criterion theoretical curves with the experimental plastic work contour map,the result shows that the Hill'48 yield criterion is in good conformity with the QP980 material.Fourth,Hill'48 yield criterion is optimized by introducing an equivalent plastic strain parameter.The result shows that average error of optimized Hill'48 theoretical yield trajectory is reduced by 8.4%.Last,finite element model about variable cross-section roll forming is established,then applying the optimized Hill'48 parameter yield criterion to the ABAQUS for finite element simulation.The simulation result shows that the forming quality is good,and in agreement with the actual forming parts.Therefore,the optimized Hill'48 yield criterion can be used to precisely describe QP980 ultra high strength steel.
