【摘 要】
：
Heat-assisted rotary draw bending(HRDB)is a promising technique for manufacturing difficult-to-form tubular components comprising high-strength titanium tubes(HSTTs)with small bending radii.However,as a multidie constrained and thermo-mechanical coupled p
【机 构】
：
Taicang Yangtze River Delta Research Institute,Northwestern Polytechnical University,Taicang 215400,
论文部分内容阅读
Heat-assisted rotary draw bending(HRDB)is a promising technique for manufacturing difficult-to-form tubular components comprising high-strength titanium tubes(HSTTs)with small bending radii.However,as a multidie constrained and thermo-mechanical coupled process with many uncertainty factors,a high risk of several defects,such as cross-section distortion,over wall thinning,or even cracking,is present.Achieving the robust design optimization(RDO)of complex forming processes remains a nontrivial and challenging scientific issue.Herein,considering a high-strength Ti-3A1-2.5V titanium alloy tube as a case material,the five significant uncertainty factors in HRDB,i.e.,temperature distribution,tube geometrical characteristics,tube material parameters,tube/tool friction,and boost velocity had been analyzed.Subsequently,considering the preheating and HRDB of HSTT,a whole-process thermomechanical three-dimensional finite element model was established and validated for virtual experiments.Further,considering the maximum section distortion Q and maximum wall-thickness thinning t as the optimization objectives and the mean and variance of material and forming parameters,an RDO model was established.Finally,the Pareto optimal solutions were obtained using the nondominated sorting genetic algorithm Ⅱ,and a minimum distance selection method was employed to obtain the satisfactory solution.Results show that the optimized solutions considering the uncertainty factors reduce the maximum section distortion rate of HSTT after bending by 38.1％and the maximum wall-thickness thinning rate by 27.8％.
其他文献
A novel Al0.5V0.1FeCrMnNi0.9 high-entropy alloy was designed to achieve enhanced strength and plasticity.The as-cast Al0.5V0.1FeCrMnNi0.9 alloy shows a typical dendritic microstructure consisting of a body-centered cubic-structured matrix phase and a B2-s
Dear editor,rnTo meet the requirement of rapid growth in the number of mobile terminals and demand for network service qual-ity from users,wireless networks must implement faster and more intelligent network operation and maintenance func-tions.One feasib
Dear editor,rnNon-orthogonal multiple access(NOMA),regarded as a promising technique for substantially increasing the spec-tral efficiency of wireless networks that comprise massive devices,has exhibited a number of significant performance advantages,incl
Nonnegative tensor decomposition has become increasingly important for multiway data analysis in recent years.The alternating proximal gradient (APG) is a popular optimization method for nonnegative tensor decomposition in the block coordinate descent fra
A reliable 235U enrichment uniformity detection system based on a compact D-D neutron generator is developed to detect the 235U enrichment uniformity of different fuel elements in the same nuclear fuel rod.The high-yield compact D-D neutron generator prov
The flow field is a pivotal part to manage the transport of water and gas in proton exchange membrane fuel cell.However,the reported water measurement methods(e.g.,X-ray and electrochemical impedance spectroscopy(EIS))cannot give a compre-hensive understa
Dear editor,rnIn remote sensing research,change detection is said to be a hot spot because of its many applications[1],and lots of synthetic aperture radar(SAR)image change detection methods are proposed.In this study,to address the prob-lem that the accu
Vehicle downshifting during braking for the hybrid electric vehicle (HEV) equipped with the automatic mechanical transmission(AMT) could adjust work points of the motor.Thus,downshifting has great potential to effectively improve the efficiency of brak-in
Energy harvesting from sun and outer space using thermoradiative devices(TRDs),despite being promising renewable energy sources,is limited only to daytime and nighttime period,respectively.Such a system with 24-hour continuous electric power generation re
Pressure fluctuations induced by a vortex rope are the major causes of hydraulic turbine vibration in partial load operating conditions.Hence,an effective control strategy should be adopted to improve rotating characteristics of the vortex rope and reduce