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Evaluation of the use of surrogate Laminaria digitata in eco-hydraulic laboratory experiments

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Journal of Hydrodynamics 2014年第3期26卷 374-383页

作者： PAUL Maike HENRY Pierre-Yves T. Forschungszentrum Küste Leibniz Universit?t Hannover Department of Marine Technology Norwegian University of Science and Technology

Inert surrogates can avoid husbandry and adaptation problems of live vegetation in laboratories. Surrogates are generally used for experiments on vegetation-hydrodynamics interactions, but it is unclear how well they replicate field conditions. Here, surrogates for the brown macroalgae Laminaria digitata were developed to reproduce its hydraulic roughness. Plant shape, stiffness and buoyancy of L. digitata were evaluated and compared to the properties of inert materials. Different surrogate materials and shapes were exposed to unidirectional flow. It is concluded that buoyancy is an important factor in low flow conditions and a basic shape might be sufficient to model complex shaped plants resulting in the same streamlined shape.

关键词： bending modulus buoyancy hydraulic forcing Laminaria digitata plant surrogate

Preparation of Ultra-nano Talcum in Sand Mill and Its Application in the Polypropylene

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Journal of Wuhan University of Technology(Materials Science) 2013年第1期28卷 12-16页

作者：宋娜 ZHANG Xiaoji SHI Liyi 丁鹏 FU Yi PENG Zhihong Research Center of Nanoscience and Nanotechnology Shanghai University Dongguan-SHU Institute of Nanotechnology (DSINT) Guangdong Silver Age Sci & Tech Co. Ltd.

The grinding of ultra-fine talcum powder and its application in a polypropylene （PP） matrix were investigated. Ultra-fine talcum powder was prepared by adjusting the grinding parameters of the physical milling process. The talcum powder exhibited polymodal distribution. The layered morphology of talcum particles in a horizontal sand mill was rarely damaged or destroyed. PP-talcum nanocomposites were prepared by melt blending using a twin-screw extruder. Nano talcum can be seen as a single particle, although it is not very apparent. The bending strength of talcum-filled PP was gradually increased by approximately 28%. The impact strength linearly decreased as the filler weight ratio increased. The overall maximum improvement in mechanical properties was recorded when the filler ratios increased from 15 wt% to 20 wt%.

关键词： inorganic mineral material ultra-fine talc powder polypropylene bending modulus

Effects of gamma irradiation and moisture absorption on mechanical properties of PA6/PTFE blends

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Effects of gamma irradiation and moisture absorption on mech...

The 9th National Conference on Rheology

作者：罗文波肖华明谭江华吴国忠林明丽 Institute of Rheological Mechanics Xiangtan University Shanghai Institute of Applied Physics Chinese Academy of Sciences Meteorological Bureau of Xiangtan

PA6/PTFE blends with varying polytetrafluoroethylene content from 3% to 15%(mass fraction)were irradiated by Co gamma-ray with various doses(20,50 and 100 kGy)under ambient *** absorption test,U-notched Charpy impact test and quasi-static tension and bending were conducted to investigate the effect of irradiation on moisture absorption and mechanical properties of the *** is shown that the exposure of the blend to Co irradiation improves the tensile modulus, tensile strength and flexural modulus due to irradiation induced cross-linking in PA6 ***,the Charpy impact strength of the blends is much lower than that of the original PA6 and it decreases slightly with the increase of irradiation ***,the flexural modulus increases to a maximum value and then decreases with further increasing the PTFE content,and the moisture absorption decreases with the increase of the PTFE content and irradiation dose.

关键词： gamma irradiation PA6/PTFE blends tensile property bending modulus Charpy impact strength

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玻璃钢蜂窝夹层结构弯曲性能理论分析研究

Aerospace China 2023年第2期24卷 46-51页

作者： LI Tianjiao LIU Liming LIU Changzhi LI Qianyun LUAN Yu Beijing Institute of Astronautical Systems Engineering Beijing 100076

In this article,theoretical calculations on the bending performance(bending strength and bending modulus)of fiberglass reinforced plastic(FRP)honeycomb sandwich structures were conducted initially,and then the bending performance of two FRP honeycomb sandwich structures with different thicknesses were measured by the Aerospace Materials Failure Analysis *** comparing and analyzing the theoretical calculations and experimental results,it was found that the theoretical calculated bending strength and bending modulus were in good agreement with those of the experimental tested within 26.5%.When designers and technicians conduct theoretical calculations on the performance of FRP honeycomb sandwich structures,they can use the formulas derived in this article,which will more accurately predict the mechanical properties of components made of composite materials.

关键词： fiberglass honeycomb sandwich structure bending intensity bending modulus engineering method experiment

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乙二醇共聚降低PBS的模量

乙二醇共聚降低PBS的模量