检索结果-南通市图书馆

作者： LU Cong-hong, LIN Yan, JI Zhou-shang, QIAN Hong ( Ship CAD Engineering Center, Dalian University of Technology, Dalian 116024, China Shanghai Ship Design and Research Institute, Shanghai, 200032, China)

Based on the related rules and regulations, the structure strength of the barge during jacket transporting and launching, designed by Shanghai Ship Design and Research Institute, is analyzed with ANSYS software. The accurate FE models of the jacket, skid rail and barge are all established in order to obtain the reliable calculating precision. Stress and deformation under some working conditions are calculated and analyzed. The element selection, model meshing and disposing method of constraints and loads for the FE model established are described in detail. The analysis of the calculated results with the improving advice of the structure and the requirement of working environment are presented, too. The referenced method is provided for the design and structure strength analysis of the barge.

关键词： ship engineering structure strength barge jacket transporting/launching finite element analysis ANSYS

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Effects of a Combined Silica-containing Additive on Structural and Rheological Properties of a Low-cement Silicon Carbide Castable

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China's Refractories 2022年第2期31卷 1-6页

作者： Valeriy V.MARTYNENKO Vladimir V.PRIMACHENKO Pavlo O.KUSHCHENKO Iri na G.SHULIK Ludmyla K.SAVINA The Ukrainian Research Institute of Refractories named after A.S.Berezhnoy Kharkiv 61024Ukraine

The use of a combined additive consisting of silica-containing additives“F”(thinning)and“S”(accelerating castable hardening)instead of the previously used silica-containing additive“A”and a mixture of dispersing additives based on polyethylene glycol in low-cement silicon carbide castable allows to improve the castable workability by increasing(in 5.4 times)the flowability of a freshly prepared castable,and increase by 1.2 and 1.1 times the cold crushing strength of heat-treated at temperatures of 110 and 1580°C,respectively,castable samples from low-cement silicon carbide castable with practically equal values of open porosity(15.8%and 16.0%).The petrographic studies of the castable sample microstructure after firing at a temperature of 1580°C showed that the investigated silica-containing additives“F”and“S”contribute to the denser and more uniform structure *** a result of the carried out research,the manufacturing technology of a low-cement silicon carbide castable was improved,of which the production was mastered at JSC“URIR named after ***”.

关键词： low-cement silicon carbide castable additives flowability structure strength

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Study on Adaptive Shape Optimization

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Journal of Beijing Institute of Technology 1998年第2期7卷 154-160页

作者：邹文胜左正兴范志刚张儒华北京理工大学车辆工程学院山西车用发动机研究所

Aim To introduce a new method of adaptive shape optimization (ASOP) based on three-dimensional structure boundary strength and optimize an engine bearing cap with the method. Methods Using the normal substance's property of thermal expansion and cooling shrinkage,the load which is proportional to the difference between the nodes' stress and their respective objective stress were applied to the corresponding variable nodes on the *** thermal load made the nodes whose stress is greater than their objective stress expand along the boundary's normal direction and the nodes whose stress is less than objec- tive stress shrink in the opposite direction , This process would repeat until the stress on the boundary nodes was converge to the objective stress. Results The satisfied results have been obtained when optimizing an engine bearing *** mass of the bearing cap is reduced to 55 percent of the total. Conclusion ASOP is an efficient,practical and reliable method which is suitable for optimizing the shape of the continuous structures.

关键词： adaptive shape optimization structure strength bearing cap

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Improving hydro-mechanical behavior of loess by a bio-strategy

Biogeotechnics

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Biogeotechnics 2023年第2期1卷 42-54页

作者： Chaosheng Tanga Xiaohua Pana Yaojia Cheng Xinlun Jia updates School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China

Loess is widely distributed all over the world,covering about 10%of the land surface on *** is one of the countries with the most serious loess soil erosion in the world,especially the loess *** is mainly related to the poor water stability and mechanical properties of the loess.A new coupling method of bio-ce-mentation(Microbially Induced Calcite Precipitation:MICP)and sand additive to improve the hydro-mechanical behavior of loess was *** feasibility,coupling improvement mechanism and the effects of sand content,bio-cement treatment cycle and cementation solution(cs)concentration were investigated through a series of *** results indicated that the proposed method was effective to improve the water stability and structure strength of *** coupling improvement performance were positively related to the sand *** the sand content was 40%,compared to bio-cement treatment,the coupling treatment was 9 times deeper in treatment depth,3.5 times stronger in peak structure strength,and the sum slaking rate was less than *** coupling improvement mechanism can be attributed to the form of the double layers including hard crust and cemented *** the addition of sand,the thickness,structure strength and water stability of the double layers *** main reason is that there were more interfacial voids between sand particles and loess particles,increasing the permeability of loess and treatment depth,forming more amount of calcium *** on the experimental condition in this study,1.0 M of CS concentration was the optimal spaying strategy to improve the hydro-mechanical properties of loess.

关键词： Loess Erosion resistance MICP Sand additive Water stability structure strength

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