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Finding buckling points for nonlinear structures by dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Hossein ESTIRI
《结构与土木工程前沿(英文)》 2020年 第14卷 第1期 页码 23-61 doi: 10.1007/s11709-019-0549-z
关键词: load factor external work dynamic relaxation static equilibrium path large displacement
Nonlinear analysis of cable structures using the dynamic relaxation method
Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI
《结构与土木工程前沿(英文)》 2021年 第15卷 第1期 页码 253-274 doi: 10.1007/s11709-020-0639-y
关键词: nonlinear analysis cable structure stiffness matrix dynamic relaxation method
A fast and accurate dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 176-189 doi: 10.1007/s11709-018-0486-2
关键词: viscous dynamic relaxation time step displacement error geometric nonlinear analysis
Deformation control criterion of shield tunnel under lateral relaxation of soft soil
《结构与土木工程前沿(英文)》 2023年 第17卷 第5期 页码 780-795 doi: 10.1007/s11709-023-0944-3
关键词: shield tunnel lateral relaxation of soil deformation control criterion of segment structure model test
The stress relaxation of cement clinkers under high temperature
Xiufang WANG,Yiwang BAO,Xiaogen LIU,Yan QIU
《机械工程前沿(英文)》 2015年 第10卷 第4期 页码 413-417 doi: 10.1007/s11465-015-0357-7
The energy consumption of crushing is directly affected by the mechanical properties of cement materials. This research provides a theoretical proof for the mechanism of the stress relaxation of cement clinkers under high temperature. Compression stress relaxation under various high temperatures is discussed using a specially developed load cell, which can measure stress and displacement under high temperatures inside an autoclave. The cell shows that stress relaxation dramatically increases and that the remaining stress rapidly decreases with an increase in temperature. Mechanical experiments are conducted under various temperatures during the cooling process to study the changes in the grinding resistance of the cement clinker with temperature. The effects of high temperature on the load-displacement curve, compressive strength, and elastic modulus of cement clinkers are systematically studied. Results show that the hardening phenomenon of the clinker becomes apparent with a decrease in temperature and that post-peak behaviors manifest characteristics of the transformation from plasticity to brittleness. The elastic modulus and compressive strength of cement clinkers increase with a decrease in temperature. The elastic modulus increases greatly when the temperature is lower than 1000 °C. The compressive strength of clinkers increases by 73.4% when the temperature drops from 1100 to 800 °C.
关键词: stress relaxation high temperature cement clinker compression elastic modulus
Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials
Erich BAUER, Zhongzhi FU, Sihong LIU,
《结构与土木工程前沿(英文)》 2010年 第4卷 第1期 页码 78-91 doi: 10.1007/s11709-010-0011-8
关键词: rockfill dams weathered granular materials hypoplasticity solid hardness creep stress relaxation
双向中继传输中基于半定松弛的非相干检测 Regular Papers-Research Articles
Chan-fei WANG, Ji-ai HE, Wei-fang WANG, Ya-mei XU
《信息与电子工程前沿(英文)》 2019年 第20卷 第9期 页码 1259-1265 doi: 10.1631/FITEE.1800096
Numerical analysis of nonlinear dynamic behavior of earth dams
Babak EBRAHIMIAN
《结构与土木工程前沿(英文)》 2011年 第5卷 第1期 页码 24-40 doi: 10.1007/s11709-010-0082-6
关键词: earth dam numerical nonlinear response dynamic analysis earthquake dam height
A survey of photon mapping state-of-the-art research and future challenges
Chun-meng KANG,Lu WAN,Yan-ning XU,Xiang-xu MENG
《信息与电子工程前沿(英文)》 2016年 第17卷 第3期 页码 185-199 doi: 10.1631/FITEE.1500251
关键词: Global illumination Photon mapping Radiance estimation Photon relaxation Progressive photon mapping
Construction of interfacial dynamic bonds for high performance lignin/polymer biocomposites
《化学科学与工程前沿(英文)》 2023年 第17卷 第10期 页码 1372-1388 doi: 10.1007/s11705-023-2302-3
Wenpo REN, Honggang CHEN, Chaohe YANG, Honghong SHAN,
《化学科学与工程前沿(英文)》 2010年 第4卷 第3期 页码 250-256 doi: 10.1007/s11705-009-0281-7
关键词: dynamic simulation molecular dynamic behavior molecule Adsorption Chromatography
大块非晶合金:历史发展和当前研究 Review
Akihisa Inoue
《工程(英文)》 2015年 第1卷 第2期 页码 185-191 doi: 10.15302/J-ENG-2015038
通过关注采用传统模型铸造方法合成首批大块非晶合金的触发点,本文论述了大块非晶合金的当前研究进展情况。该综述涵盖大块非晶合金的背景、发现、特点和应用以及近期与其相关的研究主题。由于其性质独特,非晶形成能力高且成本低廉,大块非晶合金 ( 尤其是铁基大块非晶合金) 的应用范围正逐步扩大。在不久的将来,大块非晶合金在工程领域的重要性预计将稳步提高,预期将上述创新型金属材料用于基础科学研究的热度仍将持续。
张进之,段春华
《中国工程科学》 2000年 第2卷 第6期 页码 67-72
文章介绍了应用解析板形方程推出板形最佳轧制规程和板形板厚协调控制新方法。该方法的主要特点:系统中采用了静、动态负荷分配,动态设定厚度自动控制系统(DAGC)完成了板形板厚的闭环控制,在算法中采用了贝尔曼动态规划。新方法将会改变目前轧机设计和控制思想:设计合理刚度,强调调度计划、配置轧辊凸度和优化轧制规程等方面的作用,实现信息控制。
Modelling of dynamic contact length in rail grinding process
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 242-248 doi: 10.1007/s11465-014-0305-y
Rails endure frequent dynamic loads from the passing trains for supporting trains and guiding wheels. The accumulated stress concentrations will cause the plastic deformation of rail towards generating corrugations, contact fatigue cracks and also other defects, resulting in more dangerous status even the derailment risks. So the rail grinding technology has been invented with rotating grinding stones pressed on the rail with defects removal. Such rail grinding works are directed by experiences rather than scientifically guidance, lacking of flexible and scientific operating methods. With grinding control unit holding the grinding stones, the rail grinding process has the characteristics not only the surface grinding but also the running railway vehicles. First of all, it’s important to analyze the contact length between the grinding stone and the rail, because the contact length is a critical parameter to measure the grinding capabilities of stones. Moreover, it’s needed to build up models of railway vehicle unit bonded with the grinding stone to represent the rail grinding car. Therefore the theoretical model for contact length is developed based on the geometrical analysis. And the calculating models are improved considering the grinding car’s dynamic behaviors during the grinding process. Eventually, results are obtained based on the models by taking both the operation parameters and the structure parameters into the calculation, which are suitable for revealing the process of rail grinding by combining the grinding mechanism and the railway vehicle systems.
关键词: rail grinding contact length dynamic model Hamiltonian system grinding stone rail grinding car
标题 作者 时间 类型 操作
Finding buckling points for nonlinear structures by dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Hossein ESTIRI
期刊论文
Nonlinear analysis of cable structures using the dynamic relaxation method
Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI
期刊论文
A fast and accurate dynamic relaxation scheme
Mohammad REZAIEE-PAJAND, Mohammad MOHAMMADI-KHATAMI
期刊论文
The stress relaxation of cement clinkers under high temperature
Xiufang WANG,Yiwang BAO,Xiaogen LIU,Yan QIU
期刊论文
Hypoplastic constitutive modeling of wetting deformation of weathered rockfill materials
Erich BAUER, Zhongzhi FU, Sihong LIU,
期刊论文
黄幼麟:Dynamic Consumer Preferences for Electric Vehicles — A Longitudinal Analysis(2020年7月12日)
2022年06月10日
会议视频
A survey of photon mapping state-of-the-art research and future challenges
Chun-meng KANG,Lu WAN,Yan-ning XU,Xiang-xu MENG
期刊论文
Molecular size characterization of heavy oil fractions in vacuum and solution by molecular dynamic simulation
Wenpo REN, Honggang CHEN, Chaohe YANG, Honghong SHAN,
期刊论文