|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Deformation Behavior of Medium-strength TA18 High-pressure Tubes During NC Bending with Different Bending Radii显示文摘To improve the forming quality and forming limit of the numerical control (NC) bending of high-pressure titanium alloy tubes, in this study, using three-dimensional (3D) finite element method, deformation behavior of medium-strength TA18 high-pressure tubes during NC bending with different bending radii is investigated. The results show that the cross-sectional deformation and the wall thickness variation during NC bending of TA18 tubes using a small bending radius (less than 2 times of tube outside diameter) are clearly different from that using a normal bending radius (between 2 and 4 times of tube outside diameter). For bending with a normal bending radius, with or without a mandrel, the distribution of the flattening in the bending area resembles a platform and an asymmetric parabola, respectively. For bending with a small bending radius, with or without a mandrel, the flattening both distributes like a parabola, but the former has a stable peak which deflects toward the initial bending section, and the latter has a more pronounced peak with a bending angle and deflects slightly toward the bending section. The wall thickness variations with a normal bending radius, with and without a mandrel, both resemble a platform when the bending angle exceeds a certain angle. For the bending with a small radius, the distribution of the wall thickness variation without a mandrel follows an approximate parabola which increases in value as the bending angle increases. If a mandrel is used, the thickening ratio increases from the initial bending section to the bending section. | JIANG Zhiqiang ZHAN Mei YANG He XU Xudong LI Guangjun | 2011 | Chinese Journal of Aeronautics2011，24，5： | 16 |
| 2 | Springback prediction of thick-walled high-strength titanium tube bending显示文摘Signifcant springback occurs after tube rotary-draw-bending(RDB),especially for a high-strength Ti–3Al–2.5V tube(HSTT) due to its high ratio of yield strength to Young's modulus.The combination scheme of explicit and implicit is preferred to predict the springback.This simulation strategy includes several numerical parameters,such as element type,number of elements through thickness(NEL),element size,etc.However,the influences of these parameters on springback prediction accuracy are not fully understood.Thus,taking the geometrical specifcation9.525 mm · 0.508 mm of a HSTT as the objective,the effects of numerical parameters on prediction accuracy and computation effciency of springback simulation of HSTT RDB are investigated.The simulated springback results are compared with experimental ones.The main results are:(1) solid and continuum-shell elements predict the experimental results well;(2) for C3D8R elements,NEL of at least 3 is required to obtain reliable results and a relative error of 29% can occur as NEL is varied in the range of 1–3;(3) specifying damping factor typically works well in Abaqus/Emplicit simulation of springback and the springback results are sensitive to the magnitude of damping factor.In addition,the explanations of the effect rules are given and a guideline is added. | Song Feifei Yang He Li Heng Zhan Mei Li Guangjun | 2013 | Chinese Journal of Aeronautics2013，26，5： | 15 |
| 3 | Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets显示文摘The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die sets.This paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets,including the variations in the stress,strain,wall thickness,cross sectional deformation,and defects.The results show that adding a wiper die to the base die set decreases the radial,hoop,and tangential compressive stress and the tangential compressive strain,and adding a mandrel to the base die set also decreases these stresses,but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously,and brings about a three-dimensional tensile stress concentration where the mandrel provides support.For the NC bending of medium strength TA18 tubes,the flattening of cross section is more sensitive index than the thinning of wall thickness.Introducing a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness,and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section remarkably.Considering the above effects of the mandrel and wiper die on bending performance,it is reasonable to apply the die set comprising a bending die,clamp die,and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter,in order to bend the medium strength TA18 tubes with high quality and at low cost. | ZHAN Mei JIANG ZhiQiang YANG He XU XuDong LI GuangJun | 2011 | Science China(Technological Sciences)2011，54，4： | 13 |
| 4 | Geometry-dependent springback behaviors of thin-walled tube upon cold bending显示文摘As one kind of key lightweight components with enormous quantities and diversities, the bent tubular parts have attracted in- creasing applications in aerospace, automobile, etc. Thus, how the inevitable springback behaves under different bending specifications should be fully addressed to efficiently achieve the precision forming of various bent tubes. Taking the medium strength thin-walled 6061-T4 Al-alloy tube as the objective, via the deformation theory of plasticity, explicit/implicit FE method and experimental approaches, we explored and clarified the nonlinear springback rules of the tubes and corresponding mechanisms in universal rotary draw bending regarding angular springback and radius growth by deliberately changing the tube diameter D and wall thickness t. The geometry dependent springback behaviors of thin-walled tube upon cold bending are thus revealed: 1) With the increasing of D, the tangent tensile strain increases and the proportional coefficient decreases, which causes the angular springback to decrease, while the radius springback increases due to the larger bending radius. 2) With the increasing of t, the tangent tensile strain decreases and the proportional coefficient increases, resulting in the increase of both angular springback and radius springback. 3) Under the same D/t, the angular springback varies little, while the radius springback increases with the larger diameter D. 4) The D/t can be used as a reasonable nondimensional index to evaluate the springback angle; as to the radius growth, the individual effects of the D and t should be considered. 5) The verification of the above results was conducted by experiments and analytical analysis. | LI Heng YANG He TIAN YuLi LI GuangJun WANG ZhengHua | 2012 | Science China(Technological Sciences)2012，55，12： | 10 |
| 5 | Tribological evaluation of surface modified H13 tool steel in warm forming of Ti–6Al–4V titanium alloy sheet显示文摘The H13 hot-working tool steel is widely used as die material in the warm forming of Ti–6Al–4V titanium alloy sheet. However, under the heating condition, severe friction and lubricating conditions between the H13 tools and Ti–6Al–4V titanium alloy sheet would cause difficulty in guaranteeing forming quality. Surface modification may be used to control the level of friction force, reduce the friction wear and extend the service life of dies. In this paper, four surface modification methods(chromium plating, TiAlN coating, surface polishing and nitriding treatment)were applied to the H13 surfaces. Taking the coefficient of friction(CoF) and the wear degree as evaluation indicators, the high-temperature tribological behavior of the surface modified H13 steel was experimentally investigated under different tribological conditions. The results of this study indicate that the tribological properties of the TiAlN coating under dry friction condition are better than the others for a wide range of temperature(from room temperature to 500 C), while there is little difference of tribological properties between different surface modifications under graphite lubricated condition, and the variation law of CoF with temperature under graphite lubricated is opposite to that under the dry friction. | Wang Dan Li Heng Yang He Ma Jun Li Guangjun | 2014 | Chinese Journal of Aeronautics2014，27，4： | 9 |
| 6 | Retardant effect of dihydroartemisinin on ulcerative colitis in a JAK2/STAT3-dependent manner显示文摘Dihydroartemisinin(DHA)is a semi-synthetic derivative and the main active metabolite of artemisinin.The purpose of this study was to investigate the effect of DHA on the ulcerative colitis(UC)in both in vivo and in vitro models.Weight,survival rate,colon length,and Disease Activity Index score were used to evaluate the severity of colitis.Reverse transcription quantitative polymerase chain reaction and enzyme-linked immunosorbent assay were used to detect the expressions of cytokines interleukin(IL)-1,IL-1β,IL-4,IL-6,IL-10,IL-12,and tumor necrosis factor-α(TNF-α).The expressions of Janus kinase 2(JAK2)and signal transducer and activator of transcription 3(STAT3),and the phosphorylation of JAK2(p-JAK2)and STAT3(p-STAT3),were measured by western blot analysis.Western blot analysis and immunohistochemistry were used to detect the expressions of tight junction proteins.We found that the weights and colon lengths of mice in dextran sodium sulfate(DSS)+DHA group were significantly lower and longer than those in the DSS group,respectively.Compared with those in the DSS group,the expressions of IL-1β,IL-6,IL-17,and TNF-αin the DSS+DHA and DSS+5-aminosalicylic acid(5-ASA)groups were decreased,while the expressions of IL-4 and IL-10 were significantly upregulated.DHA largely increased the expressions of zonula occludens-1 and occludin.Western blot analysis and/or immunohistochemical staining analysis showed that the expressions of JAK2,STAT3,p-JAK2,and p-STAT3 in DSS+DHA and DSS+5-ASA groups were significantly lower than those in DSS group.DHA has a specific therapeutic effect on UC.The anti-inflammatory mechanism of DHA is related to the blockage of the JAK2/STAT3 signaling pathway.These findings provide evidence that DHA may be a useful drug and is expected to become a promising new treatment for human UC. | Mingrui Jiang Guangjun Zhong Yichao Zhu Liuhua Wang Yuzhe He Qiannan Sun Xiaoqing Wu Xiaolan You Sujun Gao Dong Tang Daorong Wang | 2021 | Acta Biochimica et Biophysica Sinica2021，53，9： | 6 |
| 7 | From Green Super Rice to green agriculture:Reaping the promise of functional genomics research显示文摘Producing sufficient food with finite resources to feed the growing global population while having a smaller impact on the environment has always been a great challenge.Here,we review the concept and practices of Green Super Rice(GSR)that have led to a paradigm shift in goals for crop genetic improvement and models of food production for promoting sustainable agriculture.The momentous achievements and global deliveries of GSR have been fueled by the integration of abundant genetic resources,functional gene discoveries,and innovative breeding techniques with precise gene and whole-genome selection and efficient agronomic management to promote resource-saving,environmentally friendly crop production systems.We also provide perspectives on new horizons in genomic breeding technologies geared toward delivering green and nutritious crop varieties to further enhance the development of green agricul-ture and better nourish the world population. | Sibin Yu Jauhar Ali Shaochuan Zhou Guangjun Ren Huaan Xie Jianlong Xu Xinqiao Yu Fasong Zhou Shaobing Peng Liangyong Ma Dingyang Yuan Zefu Li Dazhou Chen Ruifeng Zheng Zhigang Zhao Chengcai Chu Aiqing You Yu Wei Susong Zhu Qiongyao Gu Guangcun He Shigui Li Guifu Liu Changhua Liu Chaopu Zhang Jinghua Xiao Lijun Luo Zhikang Li Qifa Zhang | 2022 | Molecular Plant2022，15，1： | 6 |
| 8 | Calibrating camera radial distortion with cross-ratio invariability显示文摘 | Zhang Guangjun He Junji Yang Xianming | 2003 | Optics & Laser Technology2003，35，6： | 1 |
| 9 | MicroRNA-92a Functions as an Oncogene in Colorectal Cancer by Targeting PTEN显示文摘 | Guangjun Zhang He Zhou Huaxu Xiao Zuoliang Liu Hongpeng Tian Tong Zhou | 2014 | Digestive Diseases and Sciences2014，，1： | 1 |
| 10 | Calibrating Camera Radial Distortion with Cross - ratio Invariability 显示文摘 | Zhang Guangjun He Junjie Yang Xianming | 2003 | Optics & Laser Technology2003，35，： | 1 |
| 11 | 3D Vision Inspection For Internal Surface Based On Circle Strucred-Light 显示文摘 | ZHANG Guangjun HE Jtmji LI Xiuzhi | 2005 | Sensors andActuatorsA: Physical(S0924-4247)2005，112，1： | 1 |
| 12 | Hydrogen-rich gas from catalytic steam gasification of municipal solid waste (MSW): influence of catalyst and temperature on yield and product composition 显示文摘 | He Maoyun Hu Zhiquan Xiao Bo Li Jianfen Guo Xianjun Luo Siyi Yang Fan Feng Yu Yang Guangjun Liu Shiming | 2009 | International Journal of Hydrogen Energy2009，34，1： | 1 |
| 13 | 3D vision inspection for internal surface based on circle structured light 显示文摘 | Zhang Guangjun He Junji Li Xiuzhi | 2005 | Sensors and Actuators A: Physical2005，122，1： | 1 |
| 14 | Preparation of gadolinium gallium garnet polycrystalline material by co precipitation method显示文摘 | LI Tao HE Xiaoming | 2002 | Mater Lett2002，56，： | 1 |
| 15 | The impact of sulfate reduction on the distribution of methylmercury in reservoirs in the city of Guiyang显示文摘In this paper, the relationship between sulfate reduction potential and mercury methylation potential was studied in the Aha, Baihua and Hongfeng reservoirs from Guiyang City. The methylmercury (MeHg) concentrations of lake water in the Aha Reservoir were greatly elevated as compared to those of the Hongfeng and Baihua reservoirs, which was correlated with its distinctly high SRB abundance, SO42-, and S2- concentrations. Among the three reservoirs, however, the highest MeHg was observed in in the top several centimenters of pore water profile in the Hongfeng Reservoir where the lowest S2- in pore water occurred. The distributions of MeHg in lake water and pore water showed the highest methylation potential occurred at water-sediment surface for the Aha Reservoir and the in the top several centimenters of sediments for the Hongfeng Reservoir. It is guessed that the highest mercury methylation only occurs at the sites with certain sulfide concentrations. | HE Tianrong LI Ting Yang Ruidong LUO Guangjun LANG Xiaofang An Yanling YAN Haiyu | 2013 | Chinese Journal Of Geochemistry2013，32，1： | 1 |
| 16 | Calibrating camera radial distortion with cross-ratio invariability 显示文摘 | Zhaog Guangjun He Junji Yang Xianming | 2003 | Optics and Laser Technology2003，35，6： | 1 |
| 17 | Calibrating camera radial distortion with cross-ratio invariability 显示文摘 | Zhang Guangjun He Junji Yang Xianming | 2003 | Optics & Laser Technology2003，35，5： | 1 |
| 18 | Effects of sulfate-reducing bacteria on methylmercury at the sediment–water interface显示文摘Sediment cores(containing sediment and overlying water) from Baihua Reservoir(SW China)were cultured under different redox conditions with different microbial activities, to understand the effects of sulfate-reducing bacteria(SRB) on mercury(Hg) methylation at sediment–water interfaces. Concentrations of dissolved methyl mercury(DMe Hg) in the overlying water of the control cores with bioactivity maintained(BAC) and cores with only sulfate-reducing bacteria inhibited(SRBI) and bacteria fully inhibited(BACI) were measured at the anaerobic stage followed by the aerobic stage. For the BAC and SRBI cores, DMe Hg concentrations in waters were much higher at the anaerobic stage than those at the aerobic stage, and they were negatively correlated to the dissolved oxygen concentrations(r =- 0.5311 and r =- 0.4977 for BAC and SRBI, respectively). The water DMe Hg concentrations of the SRBI cores were 50% lower than those of the BAC cores, indicating that the SRB is of great importance in Hg methylation in sediment–water systems, but there should be other microbes such as iron-reducing bacteria and those containing specific gene cluster(hgc AB), besides SRB,causing Hg methylation in the sediment–water system. | Lingxia Zeng Guangjun Luo Tianrong He Yanna Guo Xiaoli Qian | 2016 | Journal of Environmental Sciences2016，28，8： | 1 |
| 19 | Forming characteristics of thin - wall steel parts by double electrode GMAW based additive man- ufacturing显示文摘 | Dongqing Yang Chenjian He Guangjun Zhang | 2016 | Journal of Materials Processing Technology2016，，1： | 1 |
| 20 | Technical Water Treatment, furfural wastewater treatment by electrodialysis 显示文摘 | Chan Yulian Zhang He Chen Yulian Zhang He Zhou Guangjun | 1993 | (8) :347 - 3671993，，8： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员