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| 1 | Investigation on the Thermal Conductivity of 3-Dimensional and 4-Directional Braided Composites显示文摘It is vital to choose a factual and reasonable micro-structural model of braided composites for improving the calculating precision of thermal property of 3-D braided composites by finite element method (FEM). On the basis of new microstructure model of braided composites proposed recently, the model of FEM calculation for thermal conductivity of 3-dimennsional and 4-directional braided composites is set up in this paper. The curves of coefficient of effective thermal conductivity versus fiber volume ratio and interior braiding angle are obtained. Furthermore, comparing the results of FEM with the available experimental data,the reasonability and veracity of calculation are confirmed at the same time. | Liu Zhenguo Zhang Haiguo Lu Zixing Li Diansen | 2007 | Chinese Journal of Aeronautics2007，20，4： | 23 |
| 2 | Revisiting the methods for gas permeability measurement in tight porous medium显示文摘Permeability is a key parameter to describe fluid transport properties of porous medium; however, the permeability measurement is extremely difficult for tight porous medium, e.g. fine-grained rock or dense soil. In this paper, three methods for gas permeability measurement, i.e. steady state method, pulse decay method(PDM) and pressure oscillation method(POM), are first reviewed and then their advantages and drawbacks are discussed. Both analytical and numerical solutions of gas permeability are presented for the tight porous medium. The results show that the analytical method is relatively simple but only valid under certain conditions, whilst the numerical method is more robust and generic, which can take into account several factors such as porosity, saturation, gas leakage, and unconventional boundary conditions. The influence of the effective porosity on the permeability determination is further analyzed using the proposed numerical method. In this study, new pressure data interpretation procedures for PDM and POM are proposed, and the obtained results can serve as a guidance to define a proper method for permeability measurement of the tight porous medium. | Diansen Yang Wei Wang Weizhong Chen Xianjun Tan Lige Wang | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，2： | 3 |
| 3 | Experimental study on gas permeability of mudstones显示文摘 | Jo?l Billiotte Diansen Yang Kun Su | 2008 | Physics and Chemistry of the Earth2008，，： | 1 |
| 4 | Ex- perimental Study on the Compression Properties and Failure Mechanism of 3D Integrated Woven Spacer Composites 显示文摘 | Zhao Chuangqi Li Diansen Ge Tianqi | 2004 | Composite Structures2004，65，： | 1 |
| 5 | Surface properties of bamboo fiber and a comparison with cotton linter fibers显示文摘 | Shen Qing Liu Diansen Gao Yuan | 2004 | Coloids andSurfaces B Biointerfaces2004，35，34： | 1 |
| 6 | Finite element analy- sis of mechanical properties of 3D four-directional rectan- gular braided composites:Part 1 microgeometry and 3D fi- nite element model 显示文摘 | LI Diansen LI Jialu CHEN Li | 2010 | Applied Composite Materials2010，17，4： | 1 |
| 7 | Effect of temperature on bending properties and failure mechanism of three-dimensional braided composite显示文摘 | Diansen Li Daining Fang Guobing Zhang Hong Hu | 2012 | Materials and Design2012，，： | 1 |
| 8 | Experimental study on the compression properties and failure mechanism of 3D integrated woven spacer composites显示文摘 | Zhao Chuangqi Li Diansen Ge Tianqi | 2014 | Materials and Design2014，56，6： | 1 |
| 9 | Fabrication, properties and failure of 3D integrated woven spacer composites with thickened face sheets显示文摘 | Li Diansen Zhao Chuangqi Jiang Nan | 2015 | Materials Letters2015，148，6： | 1 |
| 10 | Evaluation of hydro-mechano-chemical behaviour of bentonite-sand mixtures显示文摘Bentonite-sand mixtures are widely used in engineering barrier of deep geological disposal of high-level radioactive nuclear waste and anti-seepage barrier of civil geotechnical engineering.Under the action of groundwater solution infiltration and external stress,the hydro-mechanical(HM)behaviour of bentonitesand mixtures,i.e.the swelling characteristics and permeability,will change.Once the anti-seepage and filtration effect is weakened or lost,the pollutants will spread to the biosphere.Therefore,it is necessary to study the swelling characteristics and permeability of bentonite-sand mixtures under coupled mechanochemical(MC)effect and to establish corresponding prediction model.For this reason,swelling tests under salt solution with different concentrations are conducted on pure bentonite and its mixtures with 30%,70%and 90%sand contents,the compression tests are carried out on saturated samples,and the saturated permeability coefficient k of the sample under each load is calculated by Terzaghi’s one-dimensional consolidation theory.The concepts of true effective stress pe,montmorillonite void ratio em and critical sand content as are introduced to determine the em-pe relationship and finally the k-em relationship of bentonite-sand mixtures.It is found that when the sand content aas,the em-pe relationship of the mixture is linear and independent of the salt solution concentration,and when a>as,the em-pe relationship of bentonite-sand mixture is bi-linear with the true effective deviatoric stress pesa as the intersection.In addition,the em-k relationship also shows the linear trend when aas,and the slope of the line increases with the increase of the salt solution concentration.When a>as,the k-em relationship will deviate from the linear relationship.Moreover,the larger the sand content is,the farther the deviation is.On the basis of summing the regularity,a model for predicting the HM behaviour of bentonite-sand mixture under the coupled MC effect is proposed.By comparing the swelling and permeability test results with model prediction results of different types of bentonite and its sand mixtures,the predictive model is verified.The study on the HM behaviour of bentonite-sand mixtures under salt solution infiltration and the model establishment can provide experimental and theoretical basis for the design and construction of anti-seepage engineering by bentonite-sand mixtures. | Wenjing Sun Cheng Liu Diansen Yang Dean Sun | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，2： | 1 |
| 11 | Microstructure and mechanical properties of three-dimensional five-directional braided composites显示文摘 | Li Diansen Lu Zixing Chen Li Li Jialu | 2009 | International Journal of Solids and Structures2009，46，1819： | 1 |
| 12 | A novel numerical simulation method for predicting compressive properties of 3D multiaxial braided composites considering various defects显示文摘This paper reports a novel manufacturing process of preparing the Three-Dimensional Multiaxial Braided Composites(3DMBCs) and the effects of various defects generated in the manufacturing process on the compressive mechanical properties of 3DMBCs through the experimental and numerical methods. The five-step fabrication process of the 3D multiaxial braided preform was firstly introduced in detail. Then, the influences of various defects such as voids, waviness, and fiber breakage defects on the compressive properties of 3DMBCs were discussed. It is found that the fiber breakage defect and waviness defects were the two primary factors on the decrease of compressive properties of 3DMBCs. However, void defects in the resin and interface had little effect on the composites. When the fiber breakage defect content was 25% and the waviness was 7°, the composite compressive modulus decreased by 51%. The progressive damage process and failure mechanism of the composite under 90° compressive loading confirmed the validity of the numerical model by comparing with the experiments. | Ruixin LEI Hao DOU Yan SUN Tao LIU Wei FAN Chenyang SONG Shujuan WANG Yao LU Xue YANG Diansen LI | 2023 | Chinese Journal of Aeronautics2023，36，9： | 0 |
| 13 | Characterization of microstructural features of Tamusu mudstone显示文摘Tamusu mudstone formation, located in the Alxa area in western Inner Mongolia, is considered a potential host formation for high-level radioactive waste(HLW) underground disposal in China. In this study, complementary analyses with X-ray diffraction(XRD), field emission scanning electron microscopy(FE-SEM), mercury intrusion porosimetry(MIP), and N_(2) physisorption isotherm were conducted on the Tamusu mudstone to characterize its physical characteristics and microstructural features, such as mineral compositions and pore structure. Several minerals, including carbonates, feldspar, clays and analcime, were identified in Tamusu mudstone by XRD. Images from FE-SEM show that pores in the Tamusu mudstone were dominantly on nanometer scale and generally located within their mineral matrix or at the interface with non-porous minerals. The combination of the MIP and N_2 physisorption curves indicated that the Tamusu mudstone has diverse pore sizes, a porosity varying from 2.34% to 2.84%, and a total pore volume in the range of 0.0065—0.0222 cm^(3)/g with the average pore diameter ranging from 9.6 nm to 19.23 nm. The specific surface area measured by MIP(2.572—5.861 m^(2)/g) was generally higher than that by N_(2) physisorption(1.29—3.04 m^(2)/g), due to the pore network effect, pore shape(e.g. ink-bottle shape), or technique limits. The results related to pore information can be applied as an input in the future to model single-or multi-phase fluid flow and the transport of radionuclides in porous geomedium by migration and diffusion. | Hongdan Yu Chen Lu Weizhong Chen Diansen Yang Honghui Li | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，6： | 0 |
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