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《结构与土木工程前沿(英文)》 2023年 第17卷 第4期 页码 649-668 doi: 10.1007/s11709-023-0919-4
关键词: fiber reinforced polymer textile reinforced mortar finite element analysis concrete damage plasticity calibration and validation parametric study
Computational methods for fracture in rock: a review and recent advances
Ali JENABIDEHKORDI
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 273-287 doi: 10.1007/s11709-018-0459-5
关键词: numerical modelling method development rock mechanics fractured rock rock fracturing
Dan V. BOMPA, Ahmed Y. ELGHAZOULI
《结构与土木工程前沿(英文)》 2020年 第14卷 第2期 页码 331-356 doi: 10.1007/s11709-019-0596-5
关键词: non-linear numerical modelling concrete damage plasticity RC flat slabs shear-heads punching shear
Guangbo HAO,Haiyang LI,Suzen KEMALCAN,Guimin CHEN,Jingjun YU
《机械工程前沿(英文)》 2016年 第11卷 第2期 页码 129-134 doi: 10.1007/s11465-016-0392-z
In order to accurately model compliant mechanism utilizing plate flexures, qualitative planar stress (Young’s modulus) and planar strain (plate modulus) assumptions are not feasible. This paper investigates a quantitative equivalent modulus using nonlinear finite element analysis (FEA) to reflect coupled factors in affecting the modelling accuracy of two typical distributed-compliance mechanisms. It has been shown that all parameters have influences on the equivalent modulus with different degrees; that the presence of large load-stiffening effect makes the equivalent modulus significantly deviate from the planar assumptions in two ideal scenarios; and that a plate modulus assumption is more reasonable for a very large out-of-plane thickness if the beam length is large.
关键词: coupling factors modelling accuracy compliant mechanisms equivalent modulus
3D fracture modelling and limit state analysis of prestressed composite concrete pipes
Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 165-175 doi: 10.1007/s11709-018-0484-4
关键词: cylindrical concrete structures limit state analysis 3D fracture modelling prestressed composite pipes reinforced concrete three-point bending test
ANN-based empirical modelling of pile behaviour under static compressive loading
Abdussamad ISMAIL
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 594-608 doi: 10.1007/s11709-017-0446-2
关键词: piles in compression load-deformation behaviour product-unit neural network
Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification
Attila Egedy, Lívia Gyurik, Tamás Varga, Jun Zou, Norbert Miskolczi, Haiping Yang
《化学科学与工程前沿(英文)》 2018年 第12卷 第4期 页码 708-717 doi: 10.1007/s11705-018-1767-y
Biomass is of growing interest as a secondary energy source and can be converted to fuels with higher energy density especially by pyrolysis or gasification. Understanding the mechanism and the kinetics of biomass pyrolysis (thermal decomposition) and gasification (conversion of organic material to gases) could be the key to the design of industrial devices capable of processing vast amounts of biomass feedstock. In our work real product components obtained in pyrolysis were took into consideration as well as char and oil as lumped components, and the kinetic constants for a biomass model compound (cellulose) pyrolysis and gasification were identified based on a proposed simplified reaction mechanism within a compartment model structure. A laboratory scale reactor was used for the physical experiments containing consecutive fast pyrolysis and gasification stages using alkali metal (K) containing feedstock, which has a significant effect on the cellulose pyrolysis and gasification. The detailed model was implemented in MATLAB/Simulink environment, and the unknown kinetic parameters were identified based on experimental data. The model was validated based on measurement data, and a good agreement was found. Based on the validated first principle model the optimal parameters were determined as 0.15 mL/min steam flow rate, and 4% K content.
关键词: biomass pyrolysis kinetic parameter identification compartment modelling optimisation
Saleh YAGHOOBI, Ahmad SHOOSHTARI
《结构与土木工程前沿(英文)》 2018年 第12卷 第3期 页码 341-351 doi: 10.1007/s11709-017-0393-y
Slippage corresponds to the relative displacement of a bolted joint subjected to shear loads since the construction clearance between the bolt shank and the bolthole at assembly can cause joint slip. Deflections of towers with joint slippage effects is up to 1.9 times greater than the displacements obtained by linear analytical methods. In this study, 8 different types of joints are modelled and studied in the finite element program, and the results are verified by the experimental results which have been done in the laboratory. Moreover, several types of joints have been modelled and studied and load-deformation curves have also been presented. Finally, joint slip data for different types of angles, bolt diameter and bolt arrangements are generated. Thereupon, damping ratios (z) for different types of connections are reported. The study can be useful to help in designing of wind turbine towers with a higher level of accuracy and safety.
关键词: Joint slip cyclic loading Finite element modelling Experimental joint behavior damping ratios (
Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying
Kirsten BOBZIN, Nazlim BAGCIVAN, Lidong ZHAO, Ivica PETKOVIC, Jochen SCHEIN, Karsten HARTZ-BEHREND, Stefan KIRNER, José-Luis MARQUéS, Günter FORSTER
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 324-331 doi: 10.1007/s11465-011-0125-2
Usage of a multiple-arcs system has significantly improved process stability and coating properties in air plasma spraying. However, there are still demands on understanding and controlling the physical process to determine process conditions for reproducible coating quality and homogeneity of coating microstructure. The main goal of this work is the application of numerical simulation for the prediction of the temperature profiles at the torch outlet for real process conditions. Behaviour of the gas flow and electric arcs were described in a three-dimensional numerical model. The calculated results showed the characteristic triangular temperature distribution at the torch nozzle outlet caused by three electric arcs. These results were compared with experimentally determined temperature distributions, which were obtained with specially developed computed tomography equipment for reconstructing the emissivity and temperature distribution of the plasma jet close to the torch exit. The calculated results related to temperature values and contours were verified for the most process parameters with experimental ones.
关键词: plasma spraying electric arc three-cathode plasma torch numerical simulation computed tomography
Dynamic modelling and simulation of a post-combustion CO capture process for coal-fired power plants
《化学科学与工程前沿(英文)》 2022年 第16卷 第2期 页码 198-209 doi: 10.1007/s11705-021-2057-7
关键词: CO2 capture post-combustion capture simulation dominant factor
Modeling of shear walls using finite shear connector elements based on continuum plasticity
Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER
《结构与土木工程前沿(英文)》 2017年 第11卷 第2期 页码 143-157 doi: 10.1007/s11709-016-0377-3
关键词: shear walls wall diaphragms finite element modelling plastic shear connector analytical modelling experimental comparison
Modeling limit force capacities of high force to volume lead extrusion dampers
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 609-622 doi: 10.1007/s11709-021-0724-x
关键词: extrusion lead dampers upper and lower bound analytical modelling limit force
Multi-scale investigation of active failure for various modes of wall movement
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 961-979 doi: 10.1007/s11709-021-0738-4
关键词: discrete-element modelling granular materials retaining walls particle shape arching
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
Synergistic optimization framework for the process synthesis and design of biorefineries
《化学科学与工程前沿(英文)》 2022年 第16卷 第2期 页码 251-273 doi: 10.1007/s11705-021-2071-9
关键词: biotechnology surrogate modelling superstructure optimization simulation-based optimization process design
标题 作者 时间 类型 操作
Numerical modelling of reinforced concrete flexural members strengthened using textile reinforced mortars
期刊论文
Nonlinear numerical simulation of punching shear behavior of reinforced concrete flat slabs with shear-heads
Dan V. BOMPA, Ahmed Y. ELGHAZOULI
期刊论文
Understanding coupled factors that affect the modelling accuracy of typical planar compliant mechanisms
Guangbo HAO,Haiyang LI,Suzen KEMALCAN,Guimin CHEN,Jingjun YU
期刊论文
3D fracture modelling and limit state analysis of prestressed composite concrete pipes
Pengfei HE, Yang SHEN, Yun GU, Pangyong SHEN
期刊论文
ANN-based empirical modelling of pile behaviour under static compressive loading
Abdussamad ISMAIL
期刊论文
Kinetic-compartmental modelling of potassium-containing cellulose feedstock gasification
Attila Egedy, Lívia Gyurik, Tamás Varga, Jun Zou, Norbert Miskolczi, Haiping Yang
期刊论文
Joint slip investigation based on finite element modelling verified by experimental results on wind turbine
Saleh YAGHOOBI, Ahmad SHOOSHTARI
期刊论文
Modelling and diagnostics of multiple cathodes plasma torch system for plasma spraying
Kirsten BOBZIN, Nazlim BAGCIVAN, Lidong ZHAO, Ivica PETKOVIC, Jochen SCHEIN, Karsten HARTZ-BEHREND, Stefan KIRNER, José-Luis MARQUéS, Günter FORSTER
期刊论文
Dynamic modelling and simulation of a post-combustion CO capture process for coal-fired power plants
期刊论文
Modeling of shear walls using finite shear connector elements based on continuum plasticity
Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER
期刊论文