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constitutive relationship of ionic polymer-metal composite and static response character of its cantilever setup to voltage

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Journal of Central South University of Technology 2008年第3期15卷 387-391页

作者：唐华平聂拓唐运军殷陈峰唐春喜王桥医 School of Mechanical and Electrical Engineering Central South University School of Mechanical Engineering Hunan University of Technology

As a new ionic polymer-metal composite(IPMC) for artificial muscle,the mechanical performance parameters and the relationship between the deformation and the electrical parameters of the IPMC were studied. With the digital speckle correlation method,the constitutive relationship of the IPMC was confirmed. With non-contact photography measurement,a cantilever setup was designed to confirm the relationship between the deformation of the IPMC film and the applied voltage. The relationship curve of tip displacement of the IPMC cantilever setup vs the voltage was achieved. The results indicate that the IPMC is isotropic,its elastic modulus is 232 MPa and Poisson ratio is 0.163. The curve achieved from the test of the tip displacement of the IPMC cantilever setup shows that the tip displacement reaches the maximum when the stimulated voltage is 5 V. And the tip displacement descends largely when the frequency of the applied voltage is between 30 mHz and 100 mHz.

关键词： constitutive relationship ionic polymer-metal composite(IPMC) cantilever setup static response

Intelligent method to develop constitutive relationship of Ti-6Al-2Zr-1Mo-1V alloy

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Transactions of Nonferrous Metals Society of China 2012年第6期22卷 1457-1461页

作者：孙宇曾卫东赵永庆韩远飞马雄西北工业大学凝固技术国家重点实验室西安710072 西北有色金属研究院西安710016

The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of deformation temperature and strain rate on the flow stress of Ti-6Al-2Zr-IMo-IV alloy was studied. Based on the experimental data sets, the high temperature deformation behavior of Ti-6A1-2Zr-IMo-IV alloy was presented using the intelligent method of artificial neural network （ANN）. The results indicate that the predicted flow stress values by ANN model is quite consistent with the experimental results, which implies that the artificial neural network is an effective tool for studying the hot deformation behavior of the present alloy. In addition, the development of graphical user interface is implemented using Visual Basic programming language.

关键词： Ti-6A1-2Zr-1Mo-IV alloy artificial neural network constitutive relationship deformation behavior

Mechanical Properties and constitutive relationship of the High-Durable Parallel Strand Bamboo

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Journal of Renewable Materials 2022年第1期10卷 219-235页

作者： Yousef Y.Sewar Zhancheng Zhang Xinmiao Meng Mohammed Y.Wahan Hanxiao Qi Qahtan M.Al-Shami Shijiao Luo Department of Civil Engineering Beijing Forestry UniversityBeijing100083China Department of Architecture and the Built Environment Lund UniversityLund22100Sweden Civil Engineering Department Amran UniversityAmranYemen

Engineered bamboo has recently received lots of attention of civil engineers and professional researchers due to its better mechanical performance than that of softwood *** strand bamboo is one important part of engineered bamboo for its excellent durable performance compared to the laminated veneer *** required curing temperature in hot-pressing process is usually higher than 120°C to reduce the content of nutri-tional ingredients and hemy cellulose,and to avoid the decay from the environment and ***,the appearance of engineered bamboo gets darker with the increase of temperature during the hot-pressing *** order to minimize the color deepening while maintaining the durability,a high-durable parallel strand bamboo(HPSB)with relative high hot-pressing temperature(140°C)was produced and *** present study inves-tigates the mechanical performance through tension,compression,shear and bending *** experimental behavior of the specimens was identified,including the failure mode and load-displacement *** was demonstrated that the HPSB material had better mechanical performance parallel to grain,making it as a considerable structural *** average elastic modulus parallel to grain was 14.1 GPa,and the tensile and compressive strengths were 120.7 MPa and 121.0 MPa,*** tension perpendicular to grain should be avoided in the practical application due to the lower strength and elastic *** stress-strain relationships of tension and compression parallel to grain,including three-linear and quadratic function models,were proposed and compared with the experimental *** three-linear model was then applied to the finite element *** finite element analysis using ANSYS software was conducted to validate the feasibility of the constitutive *** quadratic function model showed better agreement with the experimental results,but the three-linear relationship was also prec

关键词： Engineered bamboo bamboo scrimber mechanical property constitutive relationship finite element model

Numerical Method for Modeling the constitutive relationship of Sand under Different Stress Paths

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Journal of China University of Geosciences 2005年第3期16卷 268-270页

作者： Ren Qingyang Wang Jingtao School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China

A numerical method was used in order to establish the constitutive relationship of sands under different stress paths, Firstly, based on the numerical method modeling the constitutive law of sands, the elastoplastic constitutive relationship of sand was established for three paths： the constant proportion of principle stress path, the conventional triaxial compression （CTC） path, and the p=constant （TC） path. The yield lines of plastic volumetric strain and plastic generalized shear strain were given. Through visualization, the three dimensional surface of the stress-strain relationship in the whole stress field （p, q） obtained under the three paths was plotted. Also, by comparing the stress-strain surfaces and yield locus of the three stress paths, the differences were found to be obvious, which demonstrates that the influence of the stress paths on constitutive law was not neglected. The numerical modeling method overcame the difficulty of finding an analytical expression for plastic potential. The results simulated the experimental data with an accuracy of 90% on average, so the constitutive model established in this paper provides an effective constitutive equation for this kind of engineering, reflecting the effect of practical stress paths that occur in sands.

关键词： constitutive relationship numerical method modeling stress path

bStudy on constitutive relationship of coal based on conventional triaxial compression test

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Journal of Coal Science & Engineering(China) 2007年第3期13卷 336-339页

作者：杨永杰楚俊闫相宏（ Key Laboratory of Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266510 China

constitutive relationship of coal under triaxial compression must be determined during solving the theoretical calculation and numerical simulation about coal body failure. This paper carried out conventional triaxial compression test on No.3 coal of Baodian Colliery using MTS815.03 servo-controlled rock mechanical test system. The results indicate that the failure process of coal can be divided into 5 stages： densification stage, apparent linear elastic deformation stage, accelerated inelastic deformation stage, fracture and developing stage and plasticity flow stage. Combined with the test results, the constitutive relationship model of coal can be simplified as the four segments of straight line model of elastic-plastic hardening-plastic softening-residual perfectly plastic. Through fitting calculation of test data, the segmented constitutive equation of coal can be obtained.

关键词： coal sample triaxial compression constitutive relationship deformation fitting

Evolution mechanism and quantitative characterization of initial micro-cracks in marble under triaxial compression

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第7期25卷 586-595页

作者： Zhiliang WANG Songyu LI Jianguo WANG Ao LI Weixiang WANG Chenchen FENG Jingjing FU School of Civil Engineering Hefei University of TechnologyHefei230009China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China

The initial micro-cracks affect the evolution characteristics of macroscopic deformation and failure of rock but are often ignored in theoretical calculation,numerical simulation,and mechanical *** this study,we propose a quantitative analysis model to investigate the effects of initial micro-cracks on the evolution of marble deformation and *** relationship between the micro-crack propagation and the marble failure characteristics was comprehensively studied by combining theoretical analysis with a micro-computed tomography(micro-CT)scanning *** found that with the increase of confining pressure,the matrix elastic modulus of the marble first increased and then tended to be stable,while the micro-cracks increased *** sensitivity ranges of the marble sample matrix elastic modulus and micro-cracks to confining pressure were 0–30 MPa and 30–50 MPa,*** porosity and Poisson’s ratio decreased *** increasing proportion of internal micro-cracks led to an increase in the sample *** samples presented mainly shear failure under triaxial compression,and the failure angle decreased linearly with the increase of confining *** convergence direction of cracks decreased *** quantitative analysis model could accurately portray the relationship between the overall macroscopic deformation and the deviatoric stress of the samples at the compaction and the linear elastic stages,thus deepening the understanding of the stress–strain behavior of rocks.

关键词： Marble Initial micro-cracks Triaxial compression constitutive relationship Crack evolution

TEST AND STUDY ON THE CONSTITUTIV Erelationship OF DESERT SAND UNDER MOVING VEHICLE

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Chinese Journal of Mechanical Engineering 1999年第1期12卷 71-76页

作者： Li Jie Zhuang Jide Wei Dong Jilin University of Technology Jilin Univ of Technology Changchun China

The mechanical properties of the sand of Takelamagan desert in Xinjiang under moving vehicle are studied by soil dynamic triaxial test apparatus. The nonlinear elastic constitutive model of the sand under moving vehicle is established first. These results lay the foundations for studying the interaction between vehicle running gear and the sand of Takelamagan desert in Xinjiang. and developing sand vehicle.

关键词： Vehicle Takelamagan desert Sand constitutive relationship Nonlinear elastic constitutive model

constitutive modeling and analysis on high-temperature flow behavior of 25 steel

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Journal of Iron and Steel Research International 2021年第1期28卷 76-85页

作者： Wei Wei Chao-long Yuan Ren-dong Wu Wei Jiao Ding-chuan Liang Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

The constitutive relationship is the basis for studying the material processing technology and controlling the quality of *** and models of the plastic flow behavior of materials are often required during the manufacturing ***,establishing constitutive models with high precision and generalization and enriching material database is of great significance for optimizing processing technology and product quality of the *** on the Gleeble thermal compression test results,the essential relationship of 25 steel between the flow stress and thermal–mechanical state variables,such as temperature,strain rate,and strain,is quantitatively discussed for the first *** with the Zener–Hollomon parameter and considering the influence of strain compensation,the constitutive model of 25 steel is built by the hyperbolic-sine equation over the full strain *** the modeling process,the influence of strain on material constants is characterized by polynomial *** selection basis of polynomial order is discussed in-depth,and the inconsistency between calculation accuracy and fitting effect is ***,the accuracy of the model is analyzed,and the generalization and applicability are *** is proved that the developed model can accurately predict the flow behavior of materials in the full strain range.

关键词： constitutive relationship Flow behavior Plastic deformation Polynomial fitting Generalization

constitutive analysis of AZ31 magnesium alloy plate

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Journal of Central South University 2010年第1期17卷 7-12页

作者：余琨蔡志勇王晓艳史褆黎文献 School of Materials Science and Engineering Central South University

The plastic deformation simulation of AZ31 magnesium alloy at different elevated temperatures （from 473 to 723 K） was performed on Gleeble-1500 thermal mechanical simulator at the strain rates of 0.01, 0.1, 1, 5 and 10 s-t and the maximum deformation degree of 80%. The relationship between the flow stress and deformation temperature as well as strain rate was analyzed. The materials parameters and the apparent activation energy were calculated. The constitutive relationship was established with a Zener-Hollomon （Z） parameter. The results show that the flow stress increases with the increase of strain rate at a constant temperature, but it decreases with the increase of deformation temperature at a constant strain rate. The apparent activation energy is estimated to be 129-153 kJ/mol, which is close to that for self-diffusion of magnesium. The established constitutive relationship can reflect the change of flow stress during hot deformation.

关键词： AZ31 magnesium alloy hot deformation flow stress constitutive relationship