|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Analysis of anisotropy mechanism in the mechanical property of titanium alloy tube formed through hot flow forming显示文摘Anisotropy of mechanical property is an important feature influencing the service performance of titanium(Ti)alloy tube component.In this work,it is found that the hot flow formed Ti alloy tube exhibits higher yield strength along circumferential direction(CD),and larger elongation along rolling direction(RD),presenting significant anisotropy.Subsequently,the quantitative characteristics and underlying mechanism of the property anisotropy were revealed by analyzing the slip,damage and fracture behavior under the combined effects of the spun{0002}basal texture and fibrous microstructure for different loading directions.The results showed that the prismatic slip in primaryαgrain is the dominant deformation mechanism for both loading directions at the yielding stage.The prismatic slip is harder under CD loading,which makes CD loading present higher yield strength than RD loading.Additionally,the yield anisotropy can be quantified through the inverse ratio of the averaged Schmid Factor of the activated prismatic slip under different loading directions.As for the plasticity anisotropy,the harder and slower slip development under CD loading causes that the CD loading presents larger external force and normal stress on slip plane,thus leading to more significant cleavage fracture than RD loading.Moreover,the micro-crack path under RD loading is more tortuous than CD loading because the fibrous microstructure is elongated along RD,which may suppress the macro fracture under RD loading.These results suggest that weakening the texture and fibrous morphology of microstructure is critical to reduce the differences in slip,damage and fracture behavior along different directions,alleviate the property anisotropy and optimize the service performance of Ti alloy tube formed by hot flow forming. | Zhenni Lei Pengfei Gao Xianxian Wang Mei Zhan Hongwei Li | 2021 | Journal of Materials Science & Technology2021，，27： | 2 |
| 2 | Improving the process forming limit considering forming defects in the transitional region in local loading forming of Ti-alloy rib-web components显示文摘The isothermal local loading forming technology provides a feasible way to form Ti-alloy large-scale rib-web components in aerospace and aviation fields.However,the local loading process forming limit is restricted by forming defects in the transitional region.In this work,the feasibility of controlling forming defects and improving the process forming limit by adjusting die parameters is explored through finite element(FE) simulation.It is found that the common cavum and folding defects in the transitional region are significantly influenced by the fillet radii of left rib and middle rib,respectively.The cavum and folding defects can be effectively controlled by increasing the fillet radii of left rib and middle rib,respectively.The process forming limits considering forming defects in the transitional region are determined by the stepwise searching method under various die parameters.Moreover,the relationship between the process forming limit and die parameters is developed through the response surface methodology(RSM).The developed RSM models suggest that increasing the fillet radii of left and middle ribs is effective to improve the process forming limit during local loading forming of rib-web components.The results will provide technical basis for the design of die parameters and the reduction amount,which is of great importance to control forming defects and improve the process forming limit in local loading forming of Ti-alloy large-scale rib-web components. | Pengfei GAO Xiaodi LI He YANG Xiaoguang FAN Zhenni LEI | 2017 | Chinese Journal of Aeronautics2017，30，3： | 2 |
| 3 | Realtime observation of“spring fracture”like AlGaN/GaN HEMT failure under bias显示文摘The AlGaN/GaN HEMTs have been considered promising candidates for high-frequency and high-power applications,while the reliability issues greatly limit the commercialization of AlGaN/GaN HEMTs.In the past,the research on the reliability of devices was often based on Raman spectroscopy,cathodoluminescence,and TEM after failure of the devices,which is often considered to be the laborious and complicated“archaeological”kind of analysis[1]. | Qing ZHU Zhenni WANG Yuxiang WEI Ling YANG Xiaoli LU Jiejie ZHU Peng ZHONG Yimin LEI Xiaohua MA | 2024 | Science China(Information Sciences)2024，67，1： | 0 |
| 4 | Double Forehead Expanded Flaps for Reconstruction of Total Nasal Defect: A Case Report显示文摘Objective To introduce a method for total nasal defect reconstruction with a double forehead expanded flap.Case presentation A 55-year-old man underwent three-stage total nasal reconstruction for a complete nasal defect due to electrical injury.The skin expander was implanted during the 1st stage.Total nasal reconstruction was performed with double expanded forehead flap transfer during the 2nd stage.The unilateral forehead flap was used for lining and the contralateral forehead flap,together with the autologous cartilage and titanium mesh framework,were used for skin replacement.The forehead donor defect was covered with a skin graft.Pedicle division and inset were performed in the 3rd stage.Results There was no flap loss,infection,hematoma,rhinostenosis,or implant exposure over the 2-year follow-up,and satisfactory aesthetic results were achieved.Conclusion The double forehead expanded flap method is useful for the reconstruction of large composite nasal defects in patients who are not suitable for nasolabial flaps and those who may not tolerate free tissue transfer.The operation has fewer complications and is uncomplicated. | Houbing ZHENG Chen LEI Jiong YE Zhenni WEI Biao WANG Meishui WANG | 2020 | Chinese Journal Of Plastic and Reconstructive Surgery2020，2，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员