With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and mainta...With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and maintain the safety requirement.In order to complete hot stamping,it is important to design the structure of parts reasonably,which is related with reasonable matching of strength.The objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle performance.Through experiments,the paper obtains the stress and strain curves at different deformation temperatures and strain rates.Based on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot stamping.Combined with finite element simulation results of hot stamping by commercial software AUTOFORM,transfer path of load and matching law of strength,the paper determines the design criteria and forming technical requirements of parts manufactured by hot stamping.At the same time,the impact performance of front cross member internal plate is taken into consideration.展开更多
Lightweight structures for gears enable a reduction in material usage while maintaining the technical function of the gear.Previous approaches have pursued the strategy of lightweight structures in the gear wheel body...Lightweight structures for gears enable a reduction in material usage while maintaining the technical function of the gear.Previous approaches have pursued the strategy of lightweight structures in the gear wheel body.By taking inspiration from biological models and utilizing material savings in the gear rim,new design approaches for the lightweight design of gears can be realized.For this reason,a holistic biological design approach for spur gears is presented.In addition to the method of topology optimization,a biologically inspired approach based on diatoms is introduced,which achieves a weight reduction of over 50%compared to conventional solid gears.Diatom structures are extracted from the oceans,digitally modelled,and adapted to the load conditions of a reference gear by parametric design and simulation optimization.For the experimental validation of the design,a manufactured gear is statically loaded in the nominal load range and analyzed using a tactile geometry gear measurement.The measurement results of selected standard gear parameters show that the gear does not exhibit any plastic deformation for the nominal load capacity of 383 Nm,validating the presented design approach.展开更多
基金Project in the National Science & Technology Pillar Program during the"Twelfth Five-year Plan"Period(No.2011BAG03B02No.2011BAG03B06)
文摘With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and maintain the safety requirement.In order to complete hot stamping,it is important to design the structure of parts reasonably,which is related with reasonable matching of strength.The objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle performance.Through experiments,the paper obtains the stress and strain curves at different deformation temperatures and strain rates.Based on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot stamping.Combined with finite element simulation results of hot stamping by commercial software AUTOFORM,transfer path of load and matching law of strength,the paper determines the design criteria and forming technical requirements of parts manufactured by hot stamping.At the same time,the impact performance of front cross member internal plate is taken into consideration.
基金funded by the Federal Ministry for Economic Affairs and Climate Action as part of the Technology Transfer Program Lightweight Construction(Grant no.03LB1000A).
文摘Lightweight structures for gears enable a reduction in material usage while maintaining the technical function of the gear.Previous approaches have pursued the strategy of lightweight structures in the gear wheel body.By taking inspiration from biological models and utilizing material savings in the gear rim,new design approaches for the lightweight design of gears can be realized.For this reason,a holistic biological design approach for spur gears is presented.In addition to the method of topology optimization,a biologically inspired approach based on diatoms is introduced,which achieves a weight reduction of over 50%compared to conventional solid gears.Diatom structures are extracted from the oceans,digitally modelled,and adapted to the load conditions of a reference gear by parametric design and simulation optimization.For the experimental validation of the design,a manufactured gear is statically loaded in the nominal load range and analyzed using a tactile geometry gear measurement.The measurement results of selected standard gear parameters show that the gear does not exhibit any plastic deformation for the nominal load capacity of 383 Nm,validating the presented design approach.
