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一个可用于地震分析的界面力学模型
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作者 沈新普 Zenon Mroz 《地震学报》 CSCD 北大核心 2000年第5期553-558,共6页
首先简要介绍了层间界面在侧压力及反平面剪切载荷共同作用下 ,剪切破坏的剪切梁模型及其主要力学行为特性 ;在此基础上 ,分析了层间界面失稳阶段结构对外界的能量释放量 ,以及由于层间界面上“应力锁死”现象而产生的后续再加载过程中... 首先简要介绍了层间界面在侧压力及反平面剪切载荷共同作用下 ,剪切破坏的剪切梁模型及其主要力学行为特性 ;在此基础上 ,分析了层间界面失稳阶段结构对外界的能量释放量 ,以及由于层间界面上“应力锁死”现象而产生的后续再加载过程中的载荷突变 ;最后讨论了上述力学现象的地震学意义 . 展开更多
关键词 层间界面失效 应力锁死 界面力学模型 地震分析
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基于界面力学模型的环氧沥青混凝土蠕变行为研究
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作者 蒋梦雅 王彬彬 《四川水泥》 2018年第8期304-304,270,共2页
环氧沥青混凝土是一种新型热固性材料,不同级配及材料的的环氧沥青混凝土表现出的蠕变行为不同。本文拟采用有限元进行数值模拟,揭示环氧沥青砂浆与集料间界面特性对环氧沥青混凝土蠕变特性的响应机理。研究发现,采用界面线弹性模型的... 环氧沥青混凝土是一种新型热固性材料,不同级配及材料的的环氧沥青混凝土表现出的蠕变行为不同。本文拟采用有限元进行数值模拟,揭示环氧沥青砂浆与集料间界面特性对环氧沥青混凝土蠕变特性的响应机理。研究发现,采用界面线弹性模型的数值模拟结果和实际试验结果较接近。 展开更多
关键词 界面力学模型 蠕变 数值模拟
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合成纤维与混凝土界面粘结性能研究与发展 被引量:6
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作者 李建辉 邓宗才 +2 位作者 张建军 刘春国 王现卫 《混凝土》 CAS CSCD 北大核心 2005年第3期31-34,共4页
 本文简要阐述了合成纤维与混凝土界面粘结性能研究的意义,总结了国内外的最新研究成果,重点研究了影响界面粘结性能的因素和改善界面粘结强度的措施,并探讨了界面力学模型,对未来合成纤维—基体界面粘结性能研究的发展方向做出了展望。
关键词 合成纤维 界面粘结 聚丙烯纤维 界面力学模型
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考虑界面软化特性的土层锚杆拉拔受力分析 被引量:16
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作者 郭锐剑 谌文武 +1 位作者 段建 言志信 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2012年第10期4003-4009,共7页
基于界面黏结软化滑动力学本构模型假定,推导土层锚杆锚固力学微分方程及其解析解。在不同拉拔荷载作用下,锚杆剪应力分布模式大体有3种类型:弹性型、弹性软化型和弹性软化松动型,对一具体的工程问题,这3种模式并非均出现,受材料物理力... 基于界面黏结软化滑动力学本构模型假定,推导土层锚杆锚固力学微分方程及其解析解。在不同拉拔荷载作用下,锚杆剪应力分布模式大体有3种类型:弹性型、弹性软化型和弹性软化松动型,对一具体的工程问题,这3种模式并非均出现,受材料物理力学性质制约,为此,分析锚杆剪应力分布类型、拉拔极限荷载大小及破坏特征之间的内在关系,并给出相关判别标准及取值方法。同时,还结合已有锚杆拉拔试验资料,通过计算对比分析,验证了该方法的可行性。 展开更多
关键词 锚固工程 界面力学本构模型 锚杆拉拔极限荷载
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高固体含能材料裂纹扩展黏性域模型应用研究
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作者 廖海波 孙朝翔 《南京理工大学学报》 EI CAS CSCD 北大核心 2015年第5期511-515,共5页
针对含能粒子与基体的界面脱黏对高固体含能材料宏观力学性能的影响,该文基于黏性域模型基本理论和高固体含能材料的界面力学模型,采用界面黏性域模型对高固体含能材料的断裂过程进行了数值模拟,模拟结果与Tan的断裂实验数据较一致。分... 针对含能粒子与基体的界面脱黏对高固体含能材料宏观力学性能的影响,该文基于黏性域模型基本理论和高固体含能材料的界面力学模型,采用界面黏性域模型对高固体含能材料的断裂过程进行了数值模拟,模拟结果与Tan的断裂实验数据较一致。分析了基于界面黏性域模型的高固体含能材料的裂纹扩展特点。结果显示,在裂纹扩展过程中最大应力始终位于裂纹尖端前方某一区域。计算模型与实验模型的一致性表明,黏性域模型可用于高固体含能材料断裂性能的研究。 展开更多
关键词 黏性域模型 含能材料 界面力学模型 裂纹扩展
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界面热力学与晶界相图的研究进展 被引量:1
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作者 胡标 张华清 +3 位作者 张金 杨明军 杜勇 赵冬冬 《金属学报》 SCIE EI CAS CSCD 北大核心 2021年第9期1199-1214,共16页
晶界作为微观结构的重要组成部分,对材料的性能起着关键性的影响。晶界相变是准确阐述众多材料现象的重要信息。然而,由于晶界结构复杂、晶界相变观测困难等原因,迄今为止仍缺乏对这些材料现象的直接证据和机理解释。随着先进表征设备... 晶界作为微观结构的重要组成部分,对材料的性能起着关键性的影响。晶界相变是准确阐述众多材料现象的重要信息。然而,由于晶界结构复杂、晶界相变观测困难等原因,迄今为止仍缺乏对这些材料现象的直接证据和机理解释。随着先进表征设备特别是球差校正透射电镜的发展,再加上功能强大的计算机模拟,建立界面热力学模型并构建不同类型的晶界相图,为晶界结构及晶界相变的研究提供了广阔的前景。本文从晶界与晶界相变的分类、表征、界面热力学模型、晶界相图的构建等方面,综述了界面热力学与晶界相图的研究进展,展望了该研究领域未来发展的重点及趋势。 展开更多
关键词 晶界 晶界相变 界面力学模型 晶界相图
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INTERFACE DAMAGE ANALYSIS OF FIBER REINFORCED COMPOSITES WITH DUCTILE MATRIX 被引量:1
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作者 周储伟 王鑫伟 +1 位作者 杨卫 方岱宁 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2000年第2期119-123,共5页
A cohesive zone model is employed to simulate the fiber/matrix interface damage of composites with ductile matrix. The study is carried out to investigate the dependence of the interface damage and the composite tensi... A cohesive zone model is employed to simulate the fiber/matrix interface damage of composites with ductile matrix. The study is carried out to investigate the dependence of the interface damage and the composite tensile strength on the micro parameters of the composite. These parameters contain fiber packing pattern, fiber volume fraction, and the modulus ratio of the fiber to the matrix. The investigation reveals that though the high fiber vo lume fraction, the high fiber′s modulus and the square fiber packing can supply strong reinforcement to the composite, the interface damage is susceptible in these cases. The tensile strength of the composite is dominated by the interface strength when the interface debonding occurs. 展开更多
关键词 fiber reinforced composite micro mechanics cohesive zone model interface damage tensile strength
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A Hydrodynamic Modei for Slug Frequency in Horizontal Gas-Liquid Two-Phase Flow 被引量:3
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作者 刘磊 孙贺东 +1 位作者 胡志华 周芳德 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第5期508-514,共7页
The prediction of slug frequency has important significance on gas-liquid two-phase flow. A hydrody-namic modei was put forward to evaluate slug frequency for horizontal two-phase flow, based on the dependence of slug... The prediction of slug frequency has important significance on gas-liquid two-phase flow. A hydrody-namic modei was put forward to evaluate slug frequency for horizontal two-phase flow, based on the dependence of slug frequency on the frequency of unstable interfacial wave. Using air and water, experimental verification of the modei was carried out in a large range of flow parameters. Six electrical probes were installed at different positions of a horizontal plexiglass pipe to detect slug frequency development. The pipe is 30m long and its inner diameter is 24 mm. It is observed experimentally that the interfacial wave frequency at the inlet is about l to 3 times the frequency of stable slug. The slug frequencies predicted by the modei fit well with Tronconi (1990) modei and the experimental data. The combination of the hydrodynamic modei and the experimental data results in a conclusion that the frequency of equilibrium liquid slug is approximately half the miniraum frequency of interfacial wave. 展开更多
关键词 gas-liquid flow two-phase flow interfacial wave hydrodynamic model slug frequency
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A Molecular Thermodynamic Model for Interfacial Tension in Surfactant-Oil-Water System 被引量:2
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作者 付东 包铁竹 +2 位作者 陆九芳 李以圭 李小森 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第2期154-158,共5页
An interfacial equation of state based on perturbation theory for surfactant-oil-water system has been developed. By combining the interfacial equation of state with Boudh-Hir and Mansoori's model, a molecular the... An interfacial equation of state based on perturbation theory for surfactant-oil-water system has been developed. By combining the interfacial equation of state with Boudh-Hir and Mansoori's model, a molecular ther-modynamic model has been proposed. The interfacial tension of surfactant-oil-water systems can be calculated from the surface tensions of pure oil and water by this model. The interfacial tension data for sodium dodecyl sulphate-heptane-water system, polyoxyethylene n-octylphenol-heptane-water system and hexadecyl trimethyl ammonium bromide-heptane-water system have been correlated. By using the adjustable parameters obtained, the interfacial tensions of these systems at other temperatures have been predicted. Both the correlated and the predicted values are satisfactory. 展开更多
关键词 interfaciai tension molecular thermodynamic model perturbation theory surfactant-oil-water system
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A plasticity model for sand-structure interfaces 被引量:5
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作者 A.Lashkari 《Journal of Central South University》 SCIE EI CAS 2012年第4期1098-1108,共11页
The predictive capacity of numerical analyses in geotechnical engineering depends strongly on the efficiency of constitutive models used for modeling of interfaces behavior.Interfaces are considered as thin layers of ... The predictive capacity of numerical analyses in geotechnical engineering depends strongly on the efficiency of constitutive models used for modeling of interfaces behavior.Interfaces are considered as thin layers of the soil adjacent to structures boundary whose major role is transferring loads from structures to soil masses.An interface model within the bounding surface plasticity framework and the critical state soil mechanics is presented.To this aim,general formulation of the interface model according to the bounding surface plasticity theory is described first.Similar to granular soils,it has been shown that the mechanical behavior of sand-structure interfaces is highly affected by the interface state that is the combined influences of density and applied normal stress.Therefore,several ingredients of the model are directly related to the interface state.As a result of this feature,the model is enabled to distinguish interfaces in dense state from those in loose state and to provide realistic predictions over wide ranges of density and normal stress values.In evaluation of the model,a reasonable correspondence between the model predictions and the experimental data of various research teams is found. 展开更多
关键词 soil-structure interface SAND DILATANCY bounding surface plasticity
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A Kinetic Model for Describing the Effect of Proteins on the Air-Water Interface Tension 被引量:1
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作者 Luis Alberto Panizzolo Luis Eduardo Mussio Maria Cristina Anon 《Journal of Food Science and Engineering》 2014年第6期282-290,共9页
The main objective of this work was to develop a kinetic model to describe the variation of the surface tension in an air-water interface due to the adsorption of proteins from different origins and to identify quanti... The main objective of this work was to develop a kinetic model to describe the variation of the surface tension in an air-water interface due to the adsorption of proteins from different origins and to identify quantitatively the relevant parameters, it was considered that the processes of adsorption, unfolding and reordering of the protein molecule in the interface occur simultaneously. The model used in the present work to calculate the surface tension postulates the existence of two simultaneous processes, adsorption and protein rearrangement represented with an equation of first order with two exponential components. The relevant parameter of the equation are ka and kr-the rate constants of the two first order kinetic phases that correspond to both conformational states of the protein, adsorption and rearrangement during the process of variation of the surface tension, and the amplitude parameters Aa and Ar. The results suggest that the kinetic model for the variation of the surface tension of protein solutions proposed in this work, with two simultaneous first order processes, is more appropriate than previous models to describe such variation. 展开更多
关键词 Interface tension PROTEINS kinetic model.
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Dynamic Modeling and Active Control of a Strap-on Launch Vehicle 被引量:1
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作者 刘盼 郭绍静 蔡国平 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第4期385-394,共10页
Dynamic modeling and active control of a strap-on launch vehicle are studied in this paper. In the dynamic modeling, the double-compatible free-interface modal synthesis method is used to establish dynamic model of th... Dynamic modeling and active control of a strap-on launch vehicle are studied in this paper. In the dynamic modeling, the double-compatible free-interface modal synthesis method is used to establish dynamic model of the system, and its model precision is compared with those of finite element method(FEM), fixedinterface modal synthesis method and free-interface modal synthesis method. In the active control, the swing angle of rocket motor is used as design variable, and the control law design based on the model of mass center motion is adopted to validate the system. Simulation results indicate that the double-compatible model synthesis method can properly approximate the FEM which is used as the benchmark solution, and the model precision of the double-compatible modal synthesis method is obviously higher than those of the fixed-interface and freeinterface modal synthesis methods. Based on the control law design, the deflection of mass center of the launch vehicle is very small. 展开更多
关键词 strap-on launch vehicle dynamic modeling active control
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