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各向异性本构关系在板料成形数值模拟中的应用 总被引:7,自引:0,他引:7
对几种能表达面内各向异性的屈服准则Hill、Barlat-Lian、Barlat进行了比较。以弹性变形服从各向同性广义虎克定律的情况下,给出了基于张量算法推导的弹塑性本构关系的一般表达式,并由此导出了相应屈服准则的弹塑性本构关系的显式表达。借助ABAQUS软件本构模块用户子程序接口,分别实现了这些屈服准则在ABAQUS的嵌入。以模拟方形盒的拉延过程为例,分析了不同的屈服准则在板料成形过程数值模拟中的应用。模拟结果表明,基于弹塑性本构关系一般表达所列出的相应屈服准则的显式表达式是正确的;在采用壳元来模拟板料成形时,采用Barlat准则的模拟结果和采用Barlat-Lian准则的结果差别不大。 相似文献
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环境敏感微凝胶由于其对外界刺激的快速响应能力在药物传输和释放领域得到广泛的关注.本文报道了一种侧链含可脱除基团的温敏微凝胶,并探讨了其在药物释放中的潜在应用.通过分子设计,合成出含侧链N-叔丁氧羰基(N-Boc)的疏水单体N-(N-叔丁氧羰基-乙二胺)甘氨酸二肽甲基丙烯酰胺(BEMAGG),然后将其与N-异丙基丙烯酰胺(NIPAAm)沉淀共聚合直接得到侧链含Boc基团的微凝胶MG-Boc.通过浊点法、粒径和Zeta电位测定研究了微凝胶中Boc基团在酸中的脱除过程及其对微凝胶性能的影响,研究表明Boc基团的脱除显著影响微凝胶的体积相转变温度、粒径和Zeta电位.对盐酸阿霉素药物的释放研究表明,释放明显依赖于释放介质的pH值.该响应性的微凝胶在药物控制释放领域具有潜在的应用前景. 相似文献
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CHEN WenWen LI TangSong HE Sha LIU DingBin WANG Zhuo ZHANG Wei & JIANG XingYu CAS Key Laboratory for Biological Effects of Nanomaterials Nanosafety National Center for Nanoscience Technology Beijing China Graduate Schoold of the Chinese Academy of Sciences Beijing China Key Laboratory of Microsystems Microstructures Manufacturing Ministry of Education Harbin Institute of Technology Harbin College of Bioengineering Chongqing Universit... 《中国科学B辑(英文版)》2011,(8)
Immunoassays are useful for many bioassays. Many new techniques and materials are introduced into the immunoassay to improve the efficiency. This paper reviews recent progress in the application of microfluidic systems and gold nanoparticles in immunoassay. The micro/nano technologies and materials can offer good sensitivity, fast detection, cost-effectiveness and easy signal readout. In particular, the miniaturization of microfluidics and colorimetric assays based on gold nanoparticles have dramatically im... 相似文献
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Chen Li Wendong Wang Congying Xu Yuanxu Liu Bo He Chusheng Chen .CAS Key Laboratory of Materials for Energy Conversion University of Science Technology of China Hefei Anhui China 《天然气化学杂志》2011,(4):345-349
The double perovskite oxides Sr2Mg1-xF exMoO6-δ were investigated as catalysts for the methane oxidation.The structural properties of catalysts were characterized in detail by X-ray diffraction,X-ray photoelectron spectroscopy and X-ray absorption spectroscopy.The catalytic property was strongly influenced by the Fe substitution.The relation between catalytic performance and the degree of Fe substitution was examined with regard to the structure and surface characteristics of the mixed oxides.The Fe-containing catalysts exhibited higher activity attributable to the possible(Fe2+,Mo6+) and (Fe3+,Mo5+)valency pairs,and the highest activity was observed for Sr2Mg0.2Fe0.8MoO6-δ.The enhancement of the catalytic activity may be correlated with the Fe-relating surface lattice oxygen species and was discussed in view of the presence of oxygen vacancies. 相似文献
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A high detection efficiency calorimeter which is used to detect γ-rays with energies from 1 MeV up to 10 MeV as well as light charged particles has been proposed. Design of the geometry, results of the crystal tests and Monte Carlo simulations are presented in this paper. The simulation results confirm that the calorimeter can obtain high detection efficiency and good energy resolution with the current designed geometry. And the calorimeter is competent for the future External Target Facility (ETF) experiments. 相似文献
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Fluorinated poly(ethylene oxide) propyl-b-polydimethylsiloxane-b-propyl fluorinated poly(ethylene oxide)(FPEO-b-PDMS-b-FPEO) was synthesized by a free radical addition of carbon-hydrogen of polyether segments of poly(ethylene oxide) propyl-b-polydimethylsiloxane -b-propyl poly(ethylene oxide)(PEO-b-PDMS-b-PEO) to hexafluoropropylene(HFP) using tert-butyl peroxypivalate as an initiator.In order to reduce the possibility of side reaction,the protection and deprotection via silylation were used for the end-... 相似文献
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ASIF Anila 《中国科学B辑(英文版)》2011,(9)
A novel hyperbranched poly(urethane-tetrazole)(HPUTZ) was synthesized via the A2+BB2' approach using hexadiisocyanate(HDI) and 3-(bis-(2-hydroxyethyl)) aminopropyltetrazole(HAPTZ).The molecular structure was characterized by FTIR and 1H NMR spectroscopy.The number average molecular weight was measured to be 1.05×104 g/mol with a polydispersity of 1.27 by GPC analysis.The HPUTZ was further cured by the semi-adduct(PEG-IPDI) from polyethylene glycol(PEG) reacting with isophorone diisocyanate(IPDI) to form th... 相似文献
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Li-Na Xiang Li-Juan Chen Lin Tan Chong Zhang Fu-Hu Cao Song-Tao Liu Yan-Mei Wang 《中国化学快报》2013,24(7):597-600
A novel polydopamine-graft-poly(2-methyl-2-oxazoline)(PDA-g-PMOXA) coating was prepared by immobilizing poly(2-methyl-2-oxazoline)(PMOXA) onto material surfaces through polydopamine (PDA) anchored coating for the first time.And then,the chemical composition,hydrophilicity,and protein-resistant properties of the PDA-g-PMOXA coating were studied using X-ray photoelectron spectroscopy(XPS),contact angel(CA) test,surface plasmon resonance(SPR),and quartz crystal microbalance with dissipation(QCM-D) measurement.Finally,the coating was applied to the capillary inner surface for protein separation by capillary electrophoresis(CE). 相似文献