期刊：
Journal of Applied Polymer Science,2009年112(2):602-608 ISSN：0021-8995
通讯作者：
Xie, Jianjun
作者机构：
[Xie, Jianjun] Cent S Univ Forestry & Technol, Inst Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Luo, Yingshe; Xie, Jianjun] Cent S Univ Forestry & Technol, Inst Rheol Mech & Mat Engn, Changsha 410004, Hunan, Peoples R China.;[Xie, Jianjun; Liang, Jifu; Liu, Xinrong] Xiangtan Univ, Inst Polymer Mat, Xiangtan 411105, Hunan, Peoples R China.
通讯机构：
[Xie, Jianjun] C;Cent S Univ Forestry & Technol, Inst Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
crosslinking;hydrogels;swelling
摘要：
Poly(ethylene glycol) diacrylate (PEGDA) was synthesized and characterized with Fourier transform infrared. A superabsorbent based on poly(acrylic acid-co-acrylamide) (PAAM) was prepared by free-radical solution polymerization with various crosslinkers. The relationship between the absorbency of PAAM in distilled water and in 0.9% NaCl solutions and the swelling time was explored. The order of the equilibrium absorbency of PAAM with different crosslinkers in 0.9% NaCl solutions was glutaraldehyde (GDA) < PEGDA < N,N'-methylene bisacrylamide (NMBA) < divinylbenzene (DVB). Some swelling models were used to fit the swelling data. The second-order kinetic model was best for describing the water absorption of PAAM with water absorption rate constants in the order of DVB < PEGDA < NMBA < GDA. The repeated absorbencies of PAAM in 0.9% NaCl solutions were also investigated. The repeated absorbency of PAAM with PEGDA as the crosslinker was better that that of PAAM with other crosslinkers. The repeated absorbency of PAAM was rather poor when DVB was used as the crosslinker, although the maximum absorbency was obtained. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 602-608, 2009
摘要：
The characteristics of high-filled embankment rheological settlement were analyzed; mechanical calculation model of high-filled embankment rheological settlement during constructing and running period was also put forward. Combining the macroscopic and microscopic deformation properties of the engineering soil grain, its constitutive model was set up and its characters were fully revealed, at the same time, its practical calculation formula under the action of dead-weight load was derived, which is feasible by analysis and comparison.
关键词：
rigid-plastic;rigid-viscoplastic;variational principle;the least work consumption principle
摘要：
Plastic variational principles are foundation to solve the boundary-value problems of plastic mechanics with the variational method (or energy method) and finite element method. The most convenient way of establishing different kinds of variational principles is to set up the extreme principle related to the studied problem. Based on a general new extreme principle-the Least work consumption principle, the variational principles of the rigid-plastic and rigid-viscoplastic material were derived. In comparison with existing methods, the method in this paper is more clear and direct, and the physical meaning is clear-cut. This method can offer a new way for establishing other kinds of variational principles.
作者机构：
College of Civil Architectural Engineering and Mechanis, Central South University of Forestry and Te;Transportation Bureau of Xiangtan County, Xiangtan 411200, China
会议名称：
第九届全国流变学学术会议
会议时间：
2008-09-28
会议地点：
长沙
会议论文集名称：
第九届全国流变学学术会议论文集
关键词：
high pier;thin-walled structure;increment theory;elastoplastic finite element analysis;stability
摘要：
In the structural design of the high pier, in order to analyze the strength and structure stability, the pier was often considered a thin-walled structure. Elastoplastic incremental theory was used to establish the model of elastoplastic stability of high pier. By considering the combined action of pile, soil and pier together, the destabilization bearing capacity was calculated by using 3-D finite element method (3-D FEM) for piers with different pile and section height. Meanwhile, the equivalent stress in different sections of pier was computed and the processor of destabilization was discussed. When the pier is lower, the beating capacity under mutual effect of pile, soil and pier is less than the situation when mutual effect is not considered; when the pier is higher, their differences are not conspicuous. Along with the increase of the cross-sectional height, the direction of destabilization bearing capacity is varied and the ultimate capacity is buildup. The results of a stability analysis example are almost identical with the practice.
