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作者： Lu, Haibao Liang, Fei Zhu, Shipeng Yang, Yunhua Yao, Yongtao Fu, Y.Q. Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin China Composite Materials and Structures Laboratory Department of Mechanical Materials and Aerospace Engineering University of Central Florida OrlandoFL United States Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing China Department of Physics and Electrical Engineering Faculty of Engineering and Environment University of Northumbria Newcastle-Upon-Tyne United Kingdom

An effective approach to improve the electrical properties and electro-activated performance of shape memory polymer (SMP) nanocomposites has been demonstrated via a synergistic effect from carbon fibre and self-assembled graphene oxide (GO). The surface modified GO has been grafted onto carbon fibre to enhance the interfacial strength with SMP matrix through van-der-Waals bonds and covalent crosslinking. Carbon fibre enhances the performance of electrical actuation of SMP through Joule heating. Furthermore, the temperature distribution within the SMP nanocomposite during Joule heating becomes uniform, resulting in a significant enhancement of shape recovery and electro-actuation performance of high recovery speed. Copyright © 2015 American Scientific Publishers All rights reserved.

关键词： Graphene

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Microstructural evolution of ultrafine-grained NiCrCoAl foil after heat treatment at 1000°C

Microstructural evolution of ultrafine-grained NiCrCoAl foil...

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作者： Li, M. Zeng, G. Lin, X. Zhong, Y. He, F. He, X. National Key Laboratory for Precision Heat Processing of Metal Harbin Institute of Technology Harbin150001 China School of Material Science and Engineering Harbin Institute of Technology Harbin150001 China Center for Composite Materials and Structures Laboratory for Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

This research investigated the microstructural evolution of Ni-23·5Cr-2·66Co-1·44Al superalloy foil fabricated by electron-beam physical vapour deposition and annealed at 1000°C. The results showed that the deposited alloy mainly consisted of the γ-phase. After annealing at 1000°C, the peak moved to a lower 2è degree on the deposited side and to a higher 2è degree on the substrate side, which indicated that uniform strain existed at the deposited state and recovery occurred during annealing. With an increase in the annealing time, the (220) diffraction peak increased significantly. The average size of the grains increased and showed zigzag structures after being etched by a mixture of HNO3, HCl and HF etchant. After being annealed at 1000°C for 4 hours, the ultimate tensile strength of the Ni-23·5Cr-2·66Co-1·44Al superalloy foil was improved from 641 to 800 MPa. © W. S. Maney & Son Ltd 2015.

关键词： Microstructural evolution

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Experiment and evaluation of wrinkling strain in a corner tensioned square membrane

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Acta Mechanica Sinica 2014年第3期30卷 430-436页

作者： Lan Lan Chang-Guo Wang Hui-Feng Tan Center for Composite Materials National Key Laboratory of Science and Technology on Advanced Composites in Special EnvironmentsHarbin Institute of Technology

Prediction of wrinkling characteristics is strongly correlated with the strain perpendicular to wrinkling direc- tion. In this paper, the strain field of wrinkled membrane is tested by VIC-3D system based on the digital image correlation technique. Experimental results are validated by the tension wrinkling simulation. The experimental strain perpendicular to wrinkling direction is analyzed in depth. The wrinkling strain of a square wrinkled membrane under corner tension is extracted from experimental strain perpendicular to wrinkling direction. A quantitative characterization format of the experimental wrinkling strain is proposed. A modified prediction method of wrinkling amplitude is presented based on the experimental wrinkling strain. The re- sults show that the precision of modified prediction model has improved 13.2% compared with the classical prediction model. The results reveal that the modified model can give an accurate prediction of the wrinkling amplitude.

关键词： Membrane structure. Wrinkle Wrinkling strain.Digital image correlation Wrinkling amplitude

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Corrigendum to: “Model for Magnetostrictive Performance in Soft/hard Coupled Bilayers” [J. Magn. Magn. Mater. 393C (2015) 213−219]

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Journal of Magnetism and Magnetic Materials 2016年 408卷 332-332页

作者： Li Jianjun Duan Beibei Li Minglun National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 China Laboratoire de Magnétisme de Bretagne Université de Bretagne Occidentale 29238 Brest Cedex 3 France

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A comparative study on the viscoelastic models for rubbery materials

A comparative study on the viscoelastic models for rubbery m...

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3rd International Conference on Applied Materials and Electronics Engineering, AMEE 2014

作者： Xie, Zhi Min Zhang, Jing Wang, You Shan National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9783038350583

The rubbery materials play an important role in the acoustic metamaterials composed of locally resonant structures. To determine the unusual behavior of the dynamic mass density and bulk modulus in acoustic metamaterials in detail, better understanding of the viscoelasticity of rubbery materials is necessary. In the present work, we demonstrated the difference between the fractional and integer constitutive models in describing the viscoelastic behaviors in terms of the natural rubber(NR) and silicone rubber(SR). Test results for the relaxation modulus show that the Maxwell model is not suitable for NR and SR. The fractional Scott-Blair model gave a better estimation for the relaxation modulus but had a more sophisticated relation than the classical Maxwell model did. Compared with the other constitutive models, the fractional Maxwell model gave a better description of the mechanical properties for NR and SR, but it involved four independent parameters to be determined experimentally. By fitting test results in the double logarithmic plot of the modulus and loading time, all the parameters of the fractional Maxwell model were obtained. The present work provided a base for the analysis of the membrane-type acoustic metamaterials. © (2014) Trans Tech Publications, Switzerland.

关键词： Viscoelasticity

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Relaxation properties of the solid propellant based on hydroxyl-terminated polybutadiene

Relaxation properties of the solid propellant based on hydro...

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4th International Conference on Materials science and Information technology, MSIT 2014

作者： Xie, Zhi Min Chen, Si Chi Wang, You Shan National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9783038351733

The polymer-based propellant is a typical viscoelastic material. Better understanding of the relaxation properties of the propellant in the storage conditions is of great importance for predicting the lifetime. Due to the component complexity of the composite propellants, the transformation relation between the relaxation modulus and the complex modulus may not be suitable for all kinds of propellants. In the present work, we focused on the transformation of the relaxation modulus and complex modulus for the HTPB propellant. The master curves for the relaxation modulus and the storage modulus of the aged/unaged HTPB propellants were obtained by performing the stress relaxation tests and DMA tests, respectively. It was found that there existed a great difference in the double logarithmic plot between relaxation modulus and storage modulus master curves. Moreover, the testing results for the relaxation modulus and the storage modulus were well fitted by an empirical transformation relation with three segment-related coefficients. These three coefficients were determined by using the unaged samples, and then were applied to estimate the relaxation modulus of the aged samples. A good agreement between the calculation and the experimental results was also found, revealing that the three coefficients were insensitive to the aging time. © (2014) Trans Tech Publications, Switzerland.

关键词： Elastic moduli

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Study on virtual liver surgery simulation system with real-time haptic feedback

Study on virtual liver surgery simulation system with real-t...

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2014 2nd International Conference on Mechatronics, Robotics and Automation, ICMRA 2014

作者： Fang, Yan Hong Wu, Bin Yang, Zheng Yi Special Environment Robot Technology Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang China Centre for Advanced Imaging The University of Queensland St Lucia QLD Australia

ISBN: (纸本)9783038350781

To improve the precision and real-time of the virtual liver surgery simulation system with haptic feedback, a novel deformation modelling based on wave equation and spherical harmonic is proposed. Continuous changed liver models were mapped into a common reference system in which corresponding coefficients of spherical harmonic were compared with method of principal components analysis and force feedback were calculated by simplified deformation wave equation. Moreover, system structure design, fast collision detection and real-time feedback operation are also discussed in detail. Experimental platform of virtual liver surgery was established based on vizard 4.0 and Sensable-phantom® desktop™. Experiment results show that the system can provide a stable force to the human operator and which satisfy the requirement of real-time performance. Establishing a simple and lifelike physics deformation model and a precise and rapid collision detection algorithm favors the performance improvement of the virtual liver surgery simulation system. © (2014) Trans Tech Publications, Switzerland.

关键词： Principal component analysis

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In-situ precipitated network structure and high-temperature compressive behavior of Nb–Ti–C–B composites

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Journal of Alloys and Compounds 2014年 613卷 25-32页

作者： Xinjiang Zhang Yesheng Zhong Mingwei Li Yuyang Qin Fan Xu Xiaodong He Yibin Li Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150080 PR China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 PR China

The Nb–Ti–C–B composites were fabricated by arc-melting method under an argon atmosphere. (Nb, Ti)C carbides and (Nb, Ti)B borides were in-situ precipitated to form network structure in the Nbss matrix. The high temperature deformation behavior of the composites was investigated by the compressive experiments in the range of 1000–1200 °C. The compression strength of the composites decreases with the testing temperature increasing. However, the compression strength increases as the precipitation concentration increases. The compressive deformation mechanism dependent on temperature and precipitation are also discussed in details.

关键词： Metal matrix composites Intermetallics Compressive deformation Network structure

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Fabrication and structural characteristic of flexible organic/inorganic hybrid silica-cellulose aerogels

Fabrication and structural characteristic of flexible organi...

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2014’中国溶胶—凝胶学术研讨会暨国际论坛

作者： Fei He Mingwei Li Xiaodong He Chao Sui Center for Composite Materials Harbin Institute of Technology Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology National Key Laboratory for Precision Hot Processing of Materials Harbin Institute of Technology

Aerogels are a low-density,porous,non-crystalline,nanometer solid material,whose continuous network structures can be controlled and tialored by varying the amount of reactants,catalyst and *** fragility and brittleness,however,are the major drawbacks,which restrict their application in effective ***,the flexibility of aerogels becomes more attractive in the present *** is the most abundant resource in the world and microfibrillated cellulose can be made from all kinds of plants[1].But cellulose is an insoluble material,which is a main problem in the composite course using cellulose as an adulterant[2].Our work focuses on the preparation of new organic/inorganic hybrid silica-cellulose aerogels by the sol-gel process and supercritical *** sols were prepared by dissolving Methyltrimethoxysilane（MTMS）in acid aqueous solution by using dimethyl sulfoxide（DMSO）as solvent to suppress phase *** nanowhiskers were extracted by the acid hydrolysis of cotton wool in a 64 wt.%aqueous HSO solution and then dispersed into silica sols under the help of *** silica-cellulose aerogels of different cellulose contents were obtained by two-step acid-base sol-gel method and supercritical *** electron microscopy（SEM）,Fourier transform infrared（FT-IR）spectra and X-ray diffraction（XRD）analysis were used to investigate the microstructure and the connection of chemical *** porous structure and specific surface was measured by nitrogen *** action of cellulose in hybrid aerogels was discussed.

关键词： silica-cellulose aerogels flexible sol-gel preparation porous materials DMSO

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Fabrication and structural characteristic of flexible organic/inorganic hybrid silica-cellulose aerogels

Fabrication and structural characteristic of flexible organi...

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2014中国溶胶-凝胶学术研讨会暨国际论坛

作者： Fei He Mingwei Li Xiaodong He Chao Sui Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 National Key Laboratory for Precision Hot Processing of Materials Harbin Institute of Technology Harbin 150001 Center for Composite Materials Harbin Institute of Technology Harbin 150080

关键词： silica-cellulose aerogels flexible sol-gel preparation porous materials DMSO

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