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Numerical investigation of a novel pattern for reducing residual stress in metal additive manufacturing

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Journal of Materials Science & Technology 2021年第8期67卷 11-22页

作者： Li Sun Xiaobo Ren Jianying He zhiliang zhang Department of Structural Engineering Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway SINTEF Industry Trondheim 7456Norway

Deposition patterns can significantly affect residual stress distribution in additive manufacturing *** this paper,a novel pattern,the S-pattern,is proposed for the metal additive manufacturing *** finite element method is used to study the temperature field and the stress field of a cuboid structure under the S-pattern and five other representative patterns:zig-zag,raster,alternate-line,in-out spiral,and out-in *** results show that the S-pattern achieves the lowest values of both equivalent residual stress and maximum principal residual stress,and the warpage of the S-pattern is close to that of *** analyzing the temperature and stress fields under all patterns,it is found that the residual stress distribution is determined by the uniformity of temperature distribution which is correlated with the peak temperatures of *** equivalent residual stress and the maximum principal residual stress are inversely correlated with the average peak temperature and the minimum peak temperature of corners,*** correlations between temperature and residual stress provide an effective approach to evaluate the residual stress of different patterns and guide the deposition process in practice.

关键词： Additive manufacturing(AM) Deposition pattern Temperature distribution Residual stress Warpage

Unified Analysis and Output Estimation for a Strong Coupling Contactless Slipring System

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2263-2271页

作者： Guangming He Qianhong Chen Xiaoyong Ren zhiliang zhang the Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Physics and Electronic Electrical Engineering Huaiyin Normal UniversityHuai’an 223300China

A contactless slipring (CS) system utilizing inductive-power-transfer (IPT) technology is a good candidate for traditional mechanical slipring assemblies. However, suffering from the high harmonic currents in strong coupling CS systems, the output power will deviate from the theoretical values estimated by the fundamental harmonic approximation (FHA) and its extension method, i.e., E-FHA, in which the power is transferred by both the fundamental current and the high order harmonic currents. In order to achieve high precise output estimation, a unified analysis is proposed in this paper. First, “Fundamental-harmonic Double Resonance Phenomenon” is revealed via impedance analysis, to address the nature of the high harmonic currents in strong coupling systems. Then, a unified output current expression owning high precision is derived, and followed by a unified fundamental load impedance. Discussions show that both the output and the fundamental load impedance of FHA, and E-FHA are the special cases of the unified expressions proposed. FHA and E-FHA are precise enough for the loose coupling system, whereas the proposed method is indispensable for the strong coupling system with k>0.4 . Finally, simulations and experimental measurements of a 1.6kW CS system, as well as the comparative studies related to FHA, E-FHA, and the proposed method, are presented, indicating that the proposed method is effective for high precise output estimation.

关键词： Contactless slipring(CS) precise output estimation unified analysis

A Non-Halogenated Polymer Donor Based on Imide Unit for Organic Solar Cells with Efficiency Nearly 16%

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Chinese Journal of Chemistry 2023年第17期41卷 2095-2102页

作者： Liu zhang zhiliang zhang Haiyan Liang Xia Guo Maojie zhang Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollegeof ChemistryChemical Engineeringand Materials ScienceSoochow UniversitySuzhouJiangsu 215123China National Engineering Research Center for Colloidal Materials School of Chemistry&Chemical EngineeringShandong UniversityJinanShandong 250100China

Comprehensive Summary,Non-halogenated polymers have great potential in the commercialization of organic solar cells(OSCs)due to their advantages in the manufacturing ***,high-performance donor polymers are limited to a small amount of building ***,we utilize as building block 4H-dithieno[3,2-e:2',3'-g]isoindole-4,6(5H)-dione(DTID)to design and synthesize a relevant non-halogenated polymer PBTID for active layers in *** exhibits a strong absorption in the wavelength range of 400—600 nm with a distinctly wide optical bandgap of 2.06 eV,a low-lying highest occupied molecular orbital(HOMO)energy level of−5.53 *** addition,this polymer has a very strong aggregation effect in solution and could form nanoscale fibrils in the neat ***,when blended with the non-fullerene acceptor Y6,the devices achieve a prominent PCE of 15.8%with a high Voc of 0.87 *** Voc and PCE values are one of the highest values in the non-halogenated polymer donor-based OSCs reported to date.

关键词： Dithienophthalimide Non-halogenated polymer donor Building blocks High efficiency Organic solar cells Aggregation

Hydrodynamic cavitation as an efficient method for the formation of sub-100 nm O/W emulsions with high stability

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Chinese Journal of Chemical Engineering 2016年第10期24卷 1477-1480页

作者： zhiliang zhang Guangquan Wang Yong Nie Jianbing Ji Zhejiang Provincal Key Laboratory of Biofuel College of Chemical EngineeringZhejiang University of Technology

Hydrodynamic cavitation,a newly developed process intensification technique,has demonstrated immense potential for intensifying diverse physical and chemical *** this study,hydrodynamic cavitation was explored as an efficient method for the formation of sub-100 nm oil-in-water(O/W) emulsions with high stability.O/W emulsion with an average droplet size of 27 nm was successfully *** average droplet size of O/W emulsions decreased with the increase of the inlet pressure,number of cavitation passes and surfactant *** formed emulsion exhibited admirable physical stability during 8 ***,the hydrodynamic cavitation method can be generalized to fabricate large varieties of O/W emulsions,which showed great potential for large-scale formation of O/W emulsions with lower energy consumption.

关键词： Hydrodynamic cavitation Emulsification Emulsions Droplet size Size distribution

Effect of Variable Blank Holder Force on Rectangular Box Drawing Process of Hot-galvanized Sheet Steel

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Journal of Materials Science & Technology 2005年第6期21卷 909-913页

作者： Qunqiang FU Wei ZHU zhiliang zhang Hongying GONG China National Mold and Die CAD Engineering Research Center Shanghai Jiao Tong University Shanghai 200030 China Department of Material processing Jiangxi Institutue of Technology Ganzhou 341000 China

At first, a series of finite element method （FEM） simulation tests were used to find the critical forming conditions of hot-galvanized sheet steel during the rectangular box drawing processing when constant blank holder forces were applied. According the test results, the reasonable alteration scope of initial variable blank holder force （VBHF） was as 1.9-2.3 T. Then, based on the test productions of blank holder force, 12 typical VBHF curves were applied to perform the simulation tests by the simulation software of DYNAFORM. The simulation test results showed that VBHF had great effects on drawing formability of hot-galvanized sheet steel during the rectangular box drawing. However, the different VBHF curves were applied to control the whole drawing and it would get great different effects. At the same tine, the VBHF had great effects on the maximum thick thinning ratio, but had little effect on the maximum thick incrassation ratio. So, reasonable application of the VBHF would greatly decrease the fractures. When the VBHF profile is taken as curve L, the best effect of drawing formability could be obtained. When curve I is used, contrary effect could be gotten. The other types of curves would cause effects between above two types of VBHF curves. Finally, the actual tests were applied to check the validity of the FEM simulation tests. The results show that the FEM simulation tests are good ways for predicting and optimizing the VBHF.

关键词： Drawing process Variable blank holder force Hot-galvanized sheet steel

Effect of Friction on the Drawing Process of Hot-Galvanized Sheet Steel

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Journal of Materials Science & Technology 2005年第4期21卷 531-535页

作者： Hongying GONG Wei ZHU zhiliang zhang Zhenliang LOU China National Mold & Die CAD Engineering Research Center Shanghai Jiao Tong University Shanghai 200030 China

A probe test method was employed to detect the friction condition of the interfaces between tools and blank. At the same time a self-developed measurement apparatus to realize the probe test method was also presented. Based on the analysis of force, a correlative friction model was also given. With the self-developed measurement apparatus,the effects of three kinds of lubricating oils which were in common use during the process of sheet steel drawing were studied. By probing the friction coefficient values of different lubricating oils during the drawing process of the hot-galvanized sheet steel （steel brand： ST07Zn）, we can see that the friction caused by PK oil was the lowest, so the effect of PK oil was the best. Then PK oil was used as the base lubricating oil and some solid additive powers was added into it to make a new type lubrication （named as L oil）.The result of test proved that the new lubricating oil had remarkable effect on the drawing process of hot-galvanized sheet steel.

关键词： Drawing process Friction Probe test method Hot-galvanlzed sheet steel

Irbesartan drug formulated as nanocomposite particles for the enhancement of the dissolution rate

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Particuology 2012年第4期10卷 462-467页

作者： zhiliang zhang Yuan Le Jiexin wang Hong Zhao Jianfeng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029.China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Irbesartan （IBS）, an angiotensin II receptor antagonist, is a poorly water-soluble drug. To enhance the dis- solution rate, IBS nanocomposite particles were produced via an anti-solvent precipitation combined with a spray drying process. Four pharmaceutically acceptable excipients, including three different polymers and one charged surfactant, were evaluated as stabilizers to control the particle size and to prevent the agglomeration of particles. The experiment results indicated that polyvinylpyrrolidone （PVP） combined with sodium dodecyl sulfate （SDS） significantly decreased the particle size and enhanced the stability of drug nanoparticles. As a result, we finally obtained stable IBS nanoparticles with an average size of approx- imately 55 nm. In the dissolution test, the IBS nanocomposite particles showed a significantly enhanced dissolution rate and 100% of the drug dissolved within 20 rain. In contrast, the physical mixture with the same recipe as the IBS nanocomposite particles and the raw 1BS reached only 8% and 40% of drug dissolved in 20 rain, respectively, and both of them did not dissolve completely, even after 120 rain.

关键词： lrbesartanComposite particlesStabilizerDissolution rate

Effect of Enhanced Plasma Density on the Properties of Aluminium Doped Zinc Oxide Thin Films Produced by DC Magnetron Sputtering

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Journal of Materials Science & Technology 2011年第5期27卷 393-397页

作者： Jun Gong Xiaobo zhang zhiliang Pei Chao Sun Lishi Wen Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Aluminum doped zinc oxide （AZO） thin films were prepared by DC magnetron sputtering at low substrate temperature. A coaxial solenoid coil was placed near the magnetron target to enhance the plasma density （Ji）. The enhanced plasma density improved significantly the bulk resistivity （p） and its homogeneity in spatial distribution of AZO films. X-ray diffraction （XRD） analysis revealed that the increased Ji had influenced the crystallinity, stress relaxation and other material properties. The AZO films deposited in low plasma density （LPD） mode showed marked variation in p （ranging from -6.5x10-2 to 1.9x10-3 Ω.cm）, whereas those deposited in high plasma density （HPD） mode showed a better homogeneity of films resistivity （ranging from ~1.3x10-3 to 3.3x10-3 ~.cm） at different substrate positions. The average visible transmittance in the wavelength range of 500-800 nm was over 80%, irrespective of the deposition conditions. The atomic force microscopy （AFM） surface morphology showed that AZO films deposited in HPD mode were smoother than that in LPD mode. The high plasma density produced by the coaxial solenoid coil improved the electrical property, surface morphology and the homogeneity in spatial distribution of AZO films deposited at low substrate temperature.

关键词： Sputtering Electronic conductivity Ion bombardmentPlasma density

First report on Guanshan Biota(Cambrian Stage 4) at the stratotype area of Wulongqing Formation in Malong County, Eastern Yunnan, China

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Geoscience Frontiers 2019年第4期10卷 1459-1476页

作者： Feiyang Chen Zhifei zhang Marissa J. Betts zhiliang zhang Fan Liu State Key Laboratory of Continental Dynamics Shaanxi Key Laboratory of Early Life and EnvironmentsDepartment of GeologyNorthwest UniversityXi’an 710069China Division of Earth Sciences School of Environmental and Rural ScienceUniversity of New EnglandArmidaleNSW 2351Australia

Exceptionally preserved fossils,such as those from Cambrian Burgess Shale-type fossil-Lagerstatten are critical because of their unique contributions to knowledge of the phylogenetic radiation and palaeoecological expansion of metazoans during the Cambrian ***,these deposits provide information that is usually unobtainable from shelly and skeletonized fossils *** Guanshan Biota(Cambrian Series 2,Stage 4)in the Yunnan Province of South China,has produced abundant and diverse,exquisitely preserved fossils that often retain soft tissues and *** date,most fossils from the Guanshan Biota have been collected from localities such as Gaoloufang and Gangtoucun,which have become inaccessible due to new urban expansions and constructions of residential *** we present the first report of soft bodied fossils from a new section at Kanfuqing,close to the Wulongqing village in Malong County,approximately 3 km east of the Wulongqing Formation stratotype *** retain soft morphology,and include brachiopods with delicate marginal setae,priapulids with well-preserved sclerites and vetulicolians with entire sections of *** addition,this fauna includes rare occurrences of trilobites preserved with soft tissues replicated as pyrite pseudomorphs after *** discovery represents an important palaeogeographical extension of soft-bodied fossils of the Guanshan fauna to the east of the Xiaojiang Fault(related to Tsinning tectonic movements ca.700 Ma).The fauna from the new Kanfuqing section is similar to that reported from the Wulongqing Formation west of the Xiaojiang Fault,and thus has significant implications for early Cambrian palaeogeography,faunal successions and palaeoenvironments of eastern Yunnan.

关键词： Guanshan Biota Early Cambrian Xiaojiang Fault Eastern Yunnan Palaeoenvironment Palaeogeography