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A rate-dependent constitutive model for saturated frozen soil considering local breakage mechanism 被引量:1
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作者 Pan Wang Enlong Liu +1 位作者 Bin Zhi Bingtang Song 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第9期2458-2474,共17页
A rate-dependent constitutive model for saturated frozen soil is vital in frozen soil mechanics,especially when simultaneously describing the nonlinearity,dilatancy and strain-softening characteristics.The distributio... A rate-dependent constitutive model for saturated frozen soil is vital in frozen soil mechanics,especially when simultaneously describing the nonlinearity,dilatancy and strain-softening characteristics.The distribution of the non-uniform strain rate of saturated frozen soil at the meso-scale due to the local icecementation breakage is described by a newly binary-medium-based homogenization equation.Based on the field-equation-based approach of the meso-mechanics theory,the interaction expression of the strain rate at macro-and meso-scale is derived,which can give the strain rate concentration tensor at different crushed degrees.With the thermodynamics and empirical assumption,a breakage ratio in the rate-dependent form is determined.This overcomes the limitations of the existing binary-medium-based models that are difficult to simulate rate-dependent mechanical response.Based on these assumptions,a newly binary-medium-based rate-dependent model is proposed considering both the ice bond breakage and material composition characteristics of saturated frozen soil.The proposed constitutive model has been validated by the test results on frozen soils with different temperatures and strain rates. 展开更多
关键词 Binary-medium-based model rate-dependency Frozen soil Grain debonding effect Multi-scale constitutive model
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CRITERION FOR JUDGING SATISFACTION OF CONSISTENCY CONDITIONS IN RATE-DEPENDENT CONSTITUTIVE RELATIONS
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作者 Wang Zhe (College of Civil Engineering and Architecture,Northern Jiaotong University,Beijing 100044,China) 《Acta Mechanica Solida Sinica》 SCIE EI 1999年第4期356-364,共9页
Based on irreversible thermodynamics, the criterion for judging the satisfaction of consistency conditions in rate-dependent constitutive relationship is deduced by introducing four basic hypotheses. Formulas for solv... Based on irreversible thermodynamics, the criterion for judging the satisfaction of consistency conditions in rate-dependent constitutive relationship is deduced by introducing four basic hypotheses. Formulas for solving internal variables are given. It makes the rate-dependent model applicable no matter whether the consistency conditions can be satisfied or not. 展开更多
关键词 rate-dependent constitutive relations consistency condition irreversible thermodynamics
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Intelligent method to develop constitutive relationship of Ti-6Al-2Zr-1Mo-1V alloy 被引量:1
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作者 孙宇 曾卫东 +2 位作者 赵永庆 韩远飞 马雄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1457-1461,共5页
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 defor... 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. 展开更多
关键词 Ti-6A1-2Zr-1Mo-IV alloy artificial neural network constitutive relationship deformation behavior
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AN ENDOCHRONIC CONSTITUTIVE MODEL FOR RATE-DEPENDENT AND NONPROPORTIONAL CYCLIC PLASTICITY
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作者 Zhao, SX Kuang, ZB 《Acta Mechanica Solida Sinica》 SCIE EI 1998年第4期295-306,共12页
The total stress response of material is decomposed into a sum of an equilibrium stress response and a non-equilibrium overstress response. Correspondingly, the rate-independent intrinsic time and the rate-dependent i... The total stress response of material is decomposed into a sum of an equilibrium stress response and a non-equilibrium overstress response. Correspondingly, the rate-independent intrinsic time and the rate-dependent intrinsic time are defined respectively. Additional hardening functions for describing the isotropic and anisotropic nonproportional effects are assumed to be related to the accumulation of plastic strain component along the normal of equilibrium stress trajectory, in which the effects of geometry of the loading path are included. An endochronic constitutive model for rate-dependent, nonproportional cyclic plasticity is formulated and applied to simulate the stress responses of stainless steel XCrNil8. 9 for some typical loading programs at different loading rates. A comparison between predicted results and experimental ones by Haupt and Lion shows that the former are in agreement with the latter. 展开更多
关键词 nonproportional loading rate-dependence overstress endochronic constitutive equations
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Effects of hot deformation parameters on flow stress and establishment of constitutive relationship system of BT20 titanium alloy 被引量:6
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作者 徐文臣 单德彬 +1 位作者 吕炎 李春峰 《中国有色金属学会会刊:英文版》 CSCD 2005年第S2期167-172,共6页
The hot compression experiments were performed to investigate the effects of hot deformation parameters on the flow stress of BT20(Ti-6Al-2Zr-1Mo-1V) titanium alloy. The results show that the flow stress decreases wit... The hot compression experiments were performed to investigate the effects of hot deformation parameters on the flow stress of BT20(Ti-6Al-2Zr-1Mo-1V) titanium alloy. The results show that the flow stress decreases with the increment of deformation temperature and increases with the growth of strain rate. The peak stress moves toward the direction of strain reducing and the strain rate sensitivity increases with the rising deformation temperature. There is obvious deformation heating created during hot deformation under relatively higher strain rate and lower deformation temperature. The improved back propagation(BP) neural network with 3-20-16-1 architecture has been employed to establish the prediction model of flow stress using deformation degree, deformation temperature and strain rate as input variables. The predicted values obtained by BP network agree well with the measured values, the relative error is within 6.5% for the sample data and not bigger than 9% for the non-sample data, which indicates that the ANNs adopted can predict the flow stress of BT20 alloy effectively and can be used as constitutive relationship system applied to FEM simulation of plastic deformation. 展开更多
关键词 BT20 TITANIUM alloy hot deformation parameters flow stress constitutive relationship BP network
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Numerical Method for Modeling the Constitutive Relationship of Sand under Different Stress Paths 被引量:4
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作者 Ren Qingyang Wang Jingtao 《Journal of China University of Geosciences》 SCIE CSCD 2005年第3期268-270,共3页
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 c... 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. 展开更多
关键词 constitutive relationship numerical method modeling stress path
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CONSTITUTIVE RELATIONSHIP OF IN718 ALLOY FOR THERMOVISCOPLASTIC AND MICROSTRUCTURE EVOLUTION COUPLED ANALYSIS 被引量:2
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作者 D. Liu Y.H. Yang J. Geng Z.J. Luo 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2007年第5期373-379,共7页
The interaction between thermomechanical parameters and microstructure evolution is so intense that it must be considered during the finite element method (FEM) simulation of the hot plastic working process, for mat... The interaction between thermomechanical parameters and microstructure evolution is so intense that it must be considered during the finite element method (FEM) simulation of the hot plastic working process, for materials that are difficult to deform. Taking the microstructure evolution into account, a novel type of constitutive relationship has been put forward for the IN718 alloy. The microstructure evolution model was first established for the dominant microstructure evolution processes. Then the microstructure evolution models and the method to determine the local flow stress of the corresponding microstructure for current thermomechanical parameters and deformation history were presented. Once the local flow stresses of different structures and their volume contributions were defined, the apparent flow stress of the material could be determined as the weighted sum of the local flow stresses and volume contributions. To validate the proposed method, a thermoviscoplastics and microstructure evolution coupled analysis for a forging process of a critical IN718 disk forging was performed. The predicting results were in close agreement with the experimental data. 展开更多
关键词 constitutive relationship microstructure evolution numerical simulation IN718 alloy
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Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo 被引量:3
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作者 Yousef Y.Sewar Zhancheng Zhang +4 位作者 Xinmiao Meng Mohammed Y.Wahan Hanxiao Qi Qahtan M.Al-Shami Shijiao Luo 《Journal of Renewable Materials》 SCIE EI 2022年第1期219-235,共17页
Engineered bamboo has recently received lots of attention of civil engineers and professional researchers due to its better mechanical performance than that of softwood timber.Parallel strand bamboo is one important p... Engineered bamboo has recently received lots of attention of civil engineers and professional researchers due to its better mechanical performance than that of softwood timber.Parallel strand bamboo is one important part of engineered bamboo for its excellent durable performance compared to the laminated veneer bamboo.The 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 insects.Nonetheless,the appearance of engineered bamboo gets darker with the increase of temperature during the hot-pressing process.In 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 tested.The present study inves-tigates the mechanical performance through tension,compression,shear and bending tests.The experimental behavior of the specimens was identified,including the failure mode and load-displacement relationship.It was demonstrated that the HPSB material had better mechanical performance parallel to grain,making it as a considerable structural material.The average elastic modulus parallel to grain was 14.1 GPa,and the tensile and compressive strengths were 120.7 MPa and 121.0 MPa,respectively.The tension perpendicular to grain should be avoided in the practical application due to the lower strength and elastic modulus.Two stress-strain relationships of tension and compression parallel to grain,including three-linear and quadratic function models,were proposed and compared with the experimental results.The three-linear model was then applied to the finite element model.The finite element analysis using ANSYS software was conducted to validate the feasibility of the constitutive relationship.The quadratic function model showed better agreement with the experimental results,but the three-linear relationship was also precise enough to analyze the bending tests of HPSB material,whereas being less accurate to describe the elastic-plastic compression behavior. 展开更多
关键词 Engineered bamboo bamboo scrimber mechanical property constitutive relationship finite element model
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Constitutive relationship of ionic polymer-metal composite and static response character of its cantilever setup to voltage 被引量:1
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作者 唐华平 聂拓 +3 位作者 唐运军 殷陈峰 唐春喜 王桥医 《Journal of Central South University of Technology》 EI 2008年第3期387-391,共5页
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 di... 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. 展开更多
关键词 constitutive relationship ionic polymer-metal composite(IPMC) cantilever setup static response
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ARTIFICIAL NEURAL NETWORK MODEL OF CONSTITUTIVE RELATIONSHIP FOR 2A70 ALUMINUM ALLOY
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作者 F. Liu D.B. Shan Y. Lu Y. Y. Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第6期719-723,共5页
The hat deformation behavior of 2A70 aluminum alloy was investigated by means of isothermal compression tests performed on a Gleeble-1500 thermal simulator over a wide range of temperatures 360-480℃ with strain rates... The hat deformation behavior of 2A70 aluminum alloy was investigated by means of isothermal compression tests performed on a Gleeble-1500 thermal simulator over a wide range of temperatures 360-480℃ with strain rates of 0.01-1s^-1 and the largest deformation of 60%, and the true stress of the material was obtained under the above-mentioned conditions. The experimental results shows that 2A70 aluminum alloy is a kind of aluminum alloy with the property of dynamic recovery; its flow stress declines with the increase of temperature, while its flow stress increases with the increase of strain rates. On the basis of experiments, the constitutive relationship of the 2A70 aluminum alloy was constructed using a BP artificial neural network. Comparison of the predicted values with the experimental data shows that the relative error of the trained model is less than ±3% for the sampled data while it is less than ±6% for the nonsampled data. It is evident that the model constructed by BP ANN can accurately predict the flow stress of the 2A70 alloy. 展开更多
关键词 2A70 aluminum alloy flow stress constitutive relationship BP artificial neural network
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CONSTITUTIVE RELATIONSHIP OF SUPERALLOY IN718
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作者 J.M. Zhang L.Z. Ma +2 位作者 J. Y. Zhuang Q. Deng J.H Du and Z. Y Zhong(Department of Superalloys, Central Iron & Steel Research Institute, Beijing 100081, China)P. Janschek(Thyssen Umformtechnik GMBH, 42859 Remscheid, Germany ) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第6期473-477,共5页
Isothermal constant speed compression tests of superalloy IN718 were conducted using a computer-controlled MTS machine at temperatures from 960 to 1040℃, with initial strain rates from 0.001 s ̄(1) to 1.0 s ̄(1) and ... Isothermal constant speed compression tests of superalloy IN718 were conducted using a computer-controlled MTS machine at temperatures from 960 to 1040℃, with initial strain rates from 0.001 s ̄(1) to 1.0 s ̄(1) and engineering strain from 0.1 to 0. 7.The variations of flow stress with deformation temperature, initial strain rate and engineering strain were analyzed in the paper. It was found that there was an obvious power-law relationship between flow stress and initial strain rate, which showed the behavior of strain rate hardening of superalloy IN718 at elevated temperatures.The relationship between flow stress and temperature could be described by an inverse trigonometric function.And the turning point on the curve may be related to the behavior of δ phase at 1000℃. Meanwhile, it was found that there was a complicated relationship between flow stress and strain,which was indicative of the comprehensive effect of work hardening and dynamic softening on flow stress during hot deformation. From the results of these tests, a constitutive equation of superalloy IN718 was developed. 展开更多
关键词 constitutive relationship superalloy IN718 flow stress
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bStudy on constitutive relationship of coal based on conventional triaxial compression test
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作者 杨永杰 楚俊 闫相宏 《Journal of Coal Science & Engineering(China)》 2007年第3期336-339,共4页
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... 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. 展开更多
关键词 coal sample triaxial compression constitutive relationship DEFORMATION FITTING
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Johnson-Cook dynamic constitutive relationship for TC16 titanium alloy
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作者 杨扬 曾毅 汪冰峰 《中国有色金属学会会刊:英文版》 CSCD 2007年第A01期466-470,共5页
The true stress-strain curves of TC16 alloy with a wide range of strain rates were investigated under uniaxial quasi-static tension and uniaxial dynamic compression with the Instron 8032 test machine and the split Hop... The true stress-strain curves of TC16 alloy with a wide range of strain rates were investigated under uniaxial quasi-static tension and uniaxial dynamic compression with the Instron 8032 test machine and the split Hopkinson bar respectively. The results indicate that the true stress increases with increasing strain rate,while decreases with increasing temperature. Under the 105 s-1 high strain rate and temperature higher than 673 K,the true stress would even be less than that under quasi-static condition. A new method incorporating TC16's stress-strain curve developing item was proposed to determine the coefficients in J-C model easily and to avoid the estimation of the adiabatic temperature rising. The Johnson-Cook dynamic constitutive relationship for TC16 was obtained for the first time. Good agreement was obtained between the model prediction and the experimental stress-strain curves for TC16 under both quasi-static and dynamic loadings. 展开更多
关键词 钛合金 动力学特性 物理性能 温度
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Fractional-order visco-plastic constitutive model for uniaxial ratcheting behaviors 被引量:5
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作者 Wenjie ZHAO Shaopu YANG +1 位作者 Guilin WEN Xuehong REN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2019年第1期49-62,共14页
This paper proposes a novel unified visco-plastic constitutive model for uniaxial ratcheting behaviors. The cyclic deformation of the material presents remarkable time-dependence and history memory phenomena. The frac... This paper proposes a novel unified visco-plastic constitutive model for uniaxial ratcheting behaviors. The cyclic deformation of the material presents remarkable time-dependence and history memory phenomena. The fractional(fractional-order)derivative is an efficient tool for modeling these phenomena. Therefore, we develop a cyclic fractional-order unified visco-plastic(FVP) constitutive model. Specifically, within the framework of the cyclic elasto-plastic theory, the fractional derivative is used to describe the accumulated plastic strain rate and nonlinear kinematic hardening rule based on the Ohno-Abdel-Karim model. Moreover, a new radial return method for the back stress is developed to describe the unclosed hysteresis loops of the stress-strain properly.The capacity of the FVP model used to predict the cyclic deformation of the SS304 stainless steel is verified through a comparison with the corresponding experimental data found in the literature(KANG, G. Z., KAN, Q. H., ZHANG, J., and SUN, Y. F. Timedependent ratcheting experiments of SS304 stainless steel. International Journal of Plasticity, 22(5), 858–894(2006)). The FVP model is shown to be successful in predicting the rate-dependent ratcheting behaviors of the SS304 stainless steel. 展开更多
关键词 cyclic visco-plastic constitutive fractional DERIVATIVE FRACTIONAL-ORDER uni-fied visco-plastic(FVP)model rate-dependent RATCHETING
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Stochastic response of an axially moving viscoelastic beam with fractional order constitutive relation and random excitations 被引量:4
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作者 Di Liu Wei Xu Yong Xu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2013年第3期443-451,共9页
A convenient and universal residue calculus method is proposed to study the stochastic response behaviors of an axially moving viscoelastic beam with random noise excitations and fractional order constitutive relation... A convenient and universal residue calculus method is proposed to study the stochastic response behaviors of an axially moving viscoelastic beam with random noise excitations and fractional order constitutive relationship, where the random excitation can be decomposed as a nonstationary stochastic process, Mittag-Leffler internal noise, and external stationary noise excitation. Then, based on the Laplace transform approach, we derived the mean value function, variance function and covariance function through the Green's function technique and the residue calculus method, and obtained theoretical results. In some special case of fractional order derivative α , the Monte Carlo approach and error function results were applied to check the effectiveness of the analytical results, and good agreement was found. Finally in a general-purpose case, we also confirmed the analytical conclusion via the direct Monte Carlo simulation. 展开更多
关键词 Axially moving beam Fractional derivatives Kelvin constitutive relationship Stationary nonstationary noise Residue calculus method Stochastic response
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Constitutive analysis of AZ31 magnesium alloy plate 被引量:1
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作者 余琨 蔡志勇 +2 位作者 王晓艳 史褆 黎文献 《Journal of Central South University》 SCIE EI CAS 2010年第1期7-12,共6页
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... 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. 展开更多
关键词 AZ31 magnesium alloy hot deformation flow stress constitutive relationship
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Relationship Research between the Chinese Medicine Constitution and Sub-Health
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作者 Xiufeng Liu Bo Xu Zhenhu Chen 《Engineering(科研)》 2013年第10期429-432,共4页
With further development of the bio-psycho-social medical model, people began to re-examine the knowledge of disease and health. The concept of sub-health has also been proposed in western medicine. Because of the lac... With further development of the bio-psycho-social medical model, people began to re-examine the knowledge of disease and health. The concept of sub-health has also been proposed in western medicine. Because of the lack of a specific standard, it is difficult to make clinical diagnosis and treatments for sub-health. Chinese medicine constitution theory has been widely accepted in China, and has a set of executable standards. This paper puts forward a new research method that connects the sub-health in western medicine and Chinese medicine constitution theory together. The potential relationships and influences between Chinese medicine constitution theory and sub-health were analyzed and key content and research progress were discussed. The research method in this paper will provide new ideas for sub-health research. 展开更多
关键词 CHINESE MEDICINE constitutION SUB-HEALTH relationship
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TEST AND STUDY ON THE CONSTITUTIV ERELATIONSHIP OF DESERT SAND UNDER MOVING VEHICLE
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作者 Li Jie Zhuang Jide Wei Dong Jilin University of Technology 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1999年第1期71-76,共6页
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 vehic... 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. 展开更多
关键词 VEHICLE Takelamagan desert Sand constitutive relationship Nonlinear elastic constitutive model
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早龄期机制砂混凝土抗压强度与弹性模量时效关系及本构模型试验研究
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作者 郭琦 张卓 +2 位作者 蒲广宁 刘斌 孙虎平 《公路工程》 2024年第2期138-144,共7页
为了研究早龄期机制砂混凝土在单轴受压状态下抗压强度与弹性模量的时效关系和本构模型,通过对8组不同龄期的C60机制砂混凝土试件进行立方体抗压强度试验、静力受压弹性模量试验和单轴受压应力-应变曲线试验,并参考多种已有研究模型,建... 为了研究早龄期机制砂混凝土在单轴受压状态下抗压强度与弹性模量的时效关系和本构模型,通过对8组不同龄期的C60机制砂混凝土试件进行立方体抗压强度试验、静力受压弹性模量试验和单轴受压应力-应变曲线试验,并参考多种已有研究模型,建立了早龄期机制砂混凝土在单轴受压状态下的抗压强度与弹性模量时效关系模型和分段式应力-应变本构模型。结果表明,采用的抗压强度与弹性模量时效关系模型和分段式应力-应变本构模型与试验数据吻合效果理想,能够较好地描述早龄期C60机制砂混凝土在单轴受压状态下的力学性能。 展开更多
关键词 早龄期 时效关系 分段式 本构模型
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基于深度学习的塑性变形理论建模研究进展
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作者 王新云 唐学峰 +6 位作者 余国卿 龙锦川 温红宁 邓磊 金俊松 龚攀 张茂 《塑性工程学报》 CAS CSCD 北大核心 2024年第4期92-116,共25页
传统塑性理论模型由于引入了适当的假设和简化,面对复杂变形机制和复杂变形条件时具有局限性。基于深度学习的理论建模作为数据驱动的建模新范式,具有精度高、通用性强的特点,是塑性理论建模的重要方向。介绍了深度学习的建模方法,如传... 传统塑性理论模型由于引入了适当的假设和简化,面对复杂变形机制和复杂变形条件时具有局限性。基于深度学习的理论建模作为数据驱动的建模新范式,具有精度高、通用性强的特点,是塑性理论建模的重要方向。介绍了深度学习的建模方法,如传统神经网络模型、物理启发式神经网络模型和神经算子网络,分析了各个模型的特点。总结了近年来基于深度学习的塑性理论建模方法在本构关系、损伤断裂模型、微观组织模型和多尺度模型等方面应用的研究进展,并分析了提高模型精度、泛化能力和可解释性的方法。最后提出了基于深度学习的塑性理论建模方法面临的挑战和未来发展方向。 展开更多
关键词 深度学习 塑性理论建模 本构关系 微观组织演变模型 损伤断裂模型 多尺度模型
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