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学者姓名：彭一江
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摘要 ：
本文针对再生混凝土材料，利用均质化分析方法，建立了串联均质化模型，采用新型有限元法——基于余能原理的基面力单元法对再生混凝土进行细观层次的损伤研究，利用所编非线性损伤基面力单元法分析程序，分析了再生混凝土在单轴压缩荷载情况下的应力应变软化曲线和破坏机理，并将计算结果与试验和细观随机骨料模型分析方法的结果进行对比分析。研究结果表明：这种串联均质化分析方法可以用于分析再生混凝土材料的非线性损伤分析，可以得到再生混凝土材料的抗压强度、应力应变软化曲线和裂纹扩展的过程。
关键词 ：
Series Homogenization Model Series Homogenization Model 再生混凝土 再生混凝土 基面力单元法 基面力单元法 Base Force Element Method Base Force Element Method Mesoscopic Damage Mesoscopic Damage 串联均质化模型 串联均质化模型 Recycled Concrete Recycled Concrete 细观损伤 细观损伤
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| GB/T 7714 | Al-SayedSafwan Fouad , 陈莹 , 彭一江 . 基于串联均质化模型的再生混凝土抗压强度和破坏机理分析 [J]. | 力学研究 , 2021 , 10 (02) : 153-161 . |
| MLA | Al-SayedSafwan Fouad 等. "基于串联均质化模型的再生混凝土抗压强度和破坏机理分析" . | 力学研究 10 . 02 (2021) : 153-161 . |
| APA | Al-SayedSafwan Fouad , 陈莹 , 彭一江 . 基于串联均质化模型的再生混凝土抗压强度和破坏机理分析 . | 力学研究 , 2021 , 10 (02) , 153-161 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The 3-D base force element method (BFEM) for damage problems is proposed, which is applied to analyze the damage mechanism of recycled aggregate concrete (RAC). A piecewise curve damage constitutive model is given to simulate the constitutive relationships of RAC phases. A spatial random aggregate model of RAC is proposed. 3-D numerical simulations of RAC under uniaxial mechanical stress are carried out. The macroscopic stress-strain relationship and failure process of RAC under uniaxial stress based on the 3-D BFEM are obtained. The numerical results show a good consistency with the experimental results. This illustrates that the numerical simulation can reflect the nonlinearity deformation, stress redistribution, and crack propagation process of RAC. In addition, the influence of recycled aggregate replacement percentage on strength and elastic modulus is investigated. The results show that the content proportion of recycled aggregate has a great effect on RAC, which have to be considered in the analysis and the application of RAC.
关键词 ：
3‐ 3‐ damage constitutive model damage constitutive model damage mechanism damage mechanism D base force element method D base force element method numerical simulation numerical simulation recycled aggregate concrete recycled aggregate concrete spatial random aggregate model spatial random aggregate model
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| GB/T 7714 | Ying, Liping , Peng, Yijiang , Kamel, Mahmoud M. A. . 3-D base force element method on meso-damage analysis for recycled concrete [J]. | STRUCTURAL CONCRETE , 2021 . |
| MLA | Ying, Liping 等. "3-D base force element method on meso-damage analysis for recycled concrete" . | STRUCTURAL CONCRETE (2021) . |
| APA | Ying, Liping , Peng, Yijiang , Kamel, Mahmoud M. A. . 3-D base force element method on meso-damage analysis for recycled concrete . | STRUCTURAL CONCRETE , 2021 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The base force element method (BFEM), formulated according the principle of complementary energy, is a new finite element method (FEM) that deals with nonlinear problems. Using the BFEM, the linear elastic model and large elastic deformation model of the plane truss element are derived, and the large elastic deformation model is expanded into a three-dimensional setting in this study. The rotating part of the element should be considered when deriving the large elastic deformation model. Accordingly, it is necessary to determine whether base force can be used as a fundamental unknown variable. Nonlinear numerical calculation is performed in combination with large elastic deformations of the truss beam and frame. The calculated results conform with the theoretical results of a solid beam with equivalent deflection. In this study, the U.L and T.L formats are used to solve the governing equations iteratively. The calculated results in the T.L format are compared with those of the T2D2 and LINK1 elements in the finite element software. Only a single loading of the T.L format is necessary, rendering it a simple and convenient approach that can improve calculation efficiency. Moreover, the arc-length method is first applied to the BFEM to solve the snap-through problem.
关键词 ：
beam beam BFEM BFEM complementary energy principle complementary energy principle finite element method finite element method large elastic deformation large elastic deformation truss  truss  truss element model truss element model
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| GB/T 7714 | Peng, Yijiang , Li, Zhonghai , Kamel, Mahmoud M. A. . Geometrical nonlinear problems of truss beam by base force element method [J]. | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING , 2021 , 122 (18) : 4793-4824 . |
| MLA | Peng, Yijiang 等. "Geometrical nonlinear problems of truss beam by base force element method" . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 122 . 18 (2021) : 4793-4824 . |
| APA | Peng, Yijiang , Li, Zhonghai , Kamel, Mahmoud M. A. . Geometrical nonlinear problems of truss beam by base force element method . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING , 2021 , 122 (18) , 4793-4824 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
基于基面力的概念,并结合Euler角的位移描述方法,提出了适用于几何非线性计算的空间6结点余能基面力单元.使用MATLAB语言编程并对典型梁、板结构进行弹性大变形数值模拟.由计算结果可以看出,基于余能原理的基面力元法(BFEM)在计算构件的空间大变形时有较好的计算精度,对比传统有限元计算方法具有网格尺寸影响小和抗畸变能力强的特点,有良好的计算性能.
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| GB/T 7714 | 龚琳琦 , 陈曦昀 , 郭庆 et al. 基面力单元法在空间几何非线性问题中的应用 [J]. | 应用数学和力学 , 2021 , 42 (8) : 785-793 . |
| MLA | 龚琳琦 et al. "基面力单元法在空间几何非线性问题中的应用" . | 应用数学和力学 42 . 8 (2021) : 785-793 . |
| APA | 龚琳琦 , 陈曦昀 , 郭庆 , 彭一江 . 基面力单元法在空间几何非线性问题中的应用 . | 应用数学和力学 , 2021 , 42 (8) , 785-793 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
为了从细微观尺度上研究碳纳米管-水泥基复合材料的损伤破坏过程和破坏机理,从碳纳米管-水泥基复合材料中选取尺寸为100μm×100μm的代表单元,建立二维代表单元的细微观层次的数值模型.以势能原理的基面力元法为理论基础,对代表单元进行数值模拟,探究在单轴受压状态下碳纳米管-水泥基复合材料的力学性能变化,并绘制破坏裂纹的发展过程图和最大主应力分布变化过程图.结果表明,该代表单元模型能够较真实地模拟复合材料在单轴压缩状态下的损伤破坏过程,通过数值模拟不同含量的复合材料代表单元模型,发现增强体的含量影响着复合材料的强度及韧性,选择合适的含量范围有利于提升材料的力学性能.通过数值模拟的方法分析碳纳米管增强水泥基复合材料的作用机理,拓展了基面力元法的应用范围,节约了计算资源,其结果丰富了碳纳米管-水泥基复合材料力学性能的研究,可为相关工程应用及基础研究提供参考.
关键词 ：
碳纳米管 碳纳米管 复合建筑材料 复合建筑材料 代表单元 代表单元 基面力元法 基面力元法 数值模拟 数值模拟
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| GB/T 7714 | 吴正昊 , 应黎坪 , 杨宏明 et al. 碳纳米管增强水泥基复合材料的 二维代表单元研究 [J]. | 河北工业科技 , 2020 , 37 (4) : 211-217 . |
| MLA | 吴正昊 et al. "碳纳米管增强水泥基复合材料的 二维代表单元研究" . | 河北工业科技 37 . 4 (2020) : 211-217 . |
| APA | 吴正昊 , 应黎坪 , 杨宏明 , 彭一江 . 碳纳米管增强水泥基复合材料的 二维代表单元研究 . | 河北工业科技 , 2020 , 37 (4) , 211-217 . |
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摘要 ：
Purpose Based on the random aggregate model of recycled aggregate concrete (RAC), this paper aims to focus on the effect of loading rate on the failure pattern and the macroscopic mechanical properties. Design/methodology/approach RAC is regarded as a five-phase inhomogeneous composite material at the mesoscopic level. The number and position of the aggregates are modeled by the Walraven formula and Monte-Carlo stochastic method, respectively. The RAC specimen is divided by the finite-element mesh to establish the dynamic base force element model. In this model, the element mechanical parameters of each material phase satisfy Weibull distribution. To simulate and analyze the dynamic mechanical behavior of RAC under axial tension, flexural tension and shear tension, the dynamic tensile modes of the double-notched specimens, the simply supported beam and the L specimens are modeled, respectively. In addition, the different concrete samples are numerically investigated under different loading rates. Findings The failure strength and failure pattern of RAC have strong rate-dependent characteristics because of the inhomogeneity and the inertial effect of the material. Originality/value The dynamic base force element method has been successfully applied to the study of recycled concrete.
关键词 ：
Base force element method Base force element method Dynamic tensile failure Dynamic tensile failure Mesoscopic model Mesoscopic model Rate-dependent Rate-dependent Recycled concrete Recycled concrete
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| GB/T 7714 | Ying, Liping , Peng, Yijiang , Kamel, Mahmoud M. A. . Mesoscopic numerical analysis of dynamic tensile fracture of recycled concrete [J]. | ENGINEERING COMPUTATIONS , 2020 , 37 (6) : 1899-1922 . |
| MLA | Ying, Liping et al. "Mesoscopic numerical analysis of dynamic tensile fracture of recycled concrete" . | ENGINEERING COMPUTATIONS 37 . 6 (2020) : 1899-1922 . |
| APA | Ying, Liping , Peng, Yijiang , Kamel, Mahmoud M. A. . Mesoscopic numerical analysis of dynamic tensile fracture of recycled concrete . | ENGINEERING COMPUTATIONS , 2020 , 37 (6) , 1899-1922 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Purpose This paper aims to propose the five-phase sphere equivalent model of recycled concrete, which can be used to deduce the theoretical formulas for the Poisson's ratio and effective elastic modulus. Design/methodology/approach At a mesoscopic level, the equivalent model converts the interfacial layer, which consists of the new interfacial transition zone (ITZ), the old mortar and the old (ITZ), into a uniform equivalent medium. This paper deduces a strength expression for the interfacial transition zone at the microscopic level using the equivalent model and elastic theory. In addition, a new finite element method called the base force element method was used in this research. Findings Through numerical simulation, it was found that the mechanical property results from the five-phase sphere equivalent model were in good agreement with those of the random aggregate model. Furthermore, the proposed model agree on quite well with the available experimental data. Originality/value The equivalent model can eliminate the influence of the interfacial layer on the macroscopic mechanical properties, thereby improving the calculation accuracy and computational efficiency. The proposed model can also provide a suitable model for multi-scale calculations.
关键词 ：
Base force element method (BFEM) Base force element method (BFEM) Beso-mechanics Beso-mechanics Five-phase sphere equivalent model Five-phase sphere equivalent model Interfacial transition zone Interfacial transition zone Numerical simulation Numerical simulation Recycled concrete Recycled concrete
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| GB/T 7714 | Peng, Yijiang , Wu, Zhenghao , Ying, Liping et al. Five-phase sphere equivalent model of recycled concrete and numerical simulation based on the base force element method [J]. | ENGINEERING COMPUTATIONS , 2020 , 38 (5) : 1957-1977 . |
| MLA | Peng, Yijiang et al. "Five-phase sphere equivalent model of recycled concrete and numerical simulation based on the base force element method" . | ENGINEERING COMPUTATIONS 38 . 5 (2020) : 1957-1977 . |
| APA | Peng, Yijiang , Wu, Zhenghao , Ying, Liping , Yang, Desi . Five-phase sphere equivalent model of recycled concrete and numerical simulation based on the base force element method . | ENGINEERING COMPUTATIONS , 2020 , 38 (5) , 1957-1977 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, the base force element method (BFEM) for dynamic damage problems is proposed. And the BFEM model was applied to investigate the dynamic mechanical behavior of recycled aggregate concrete (RAC). Any convex polygon recycled aggregate was simulated. A constitutive relationship of dynamic damage was given. The compression test under dynamic loadings on the recycled concrete specimen was simulated. The stress-strain softening curve, variation law of dynamic enhancement coefficient and the damage pattern were researched under different strain rates. The dynamic properties of recycled concrete materials at high strain rate are also studied. The effect of different aggregate distribution on the mechanical properties of concrete was studied. The results of dynamic calculation of recycled concrete materials by this method are compared with the experimental results. The numerical simulation results are in good agreement with the experimental results. The comparative analysis on the dynamic mechanical properties of RAC and natural aggregate concrete (NAC) was also studied. The results show that the BFEM can be used to analyze the dynamic mechanical properties of RAC and NAC under high strain rate, and can be used for large-scale engineering calculations.
关键词 ：
base force element method base force element method dynamic behavior dynamic behavior meso-damage meso-damage Recycled aggregate concrete Recycled aggregate concrete strain rate effect strain rate effect
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| GB/T 7714 | Ying, Liping , Peng, Yijiang , Yang, Hongming . Meso-Analysis of Dynamic Compressive Behavior of Recycled Aggregate Concrete Using BFEM [J]. | INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS , 2020 , 17 (6) . |
| MLA | Ying, Liping et al. "Meso-Analysis of Dynamic Compressive Behavior of Recycled Aggregate Concrete Using BFEM" . | INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS 17 . 6 (2020) . |
| APA | Ying, Liping , Peng, Yijiang , Yang, Hongming . Meso-Analysis of Dynamic Compressive Behavior of Recycled Aggregate Concrete Using BFEM . | INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS , 2020 , 17 (6) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To study the properties of the interfacial transition zone (ITZ) of recycled aggregate concrete (RAC), a RAC model was presented that can mesh directly inside the aggregate. The characteristics of the ITZ can be accurately identified and simulated based on this model. Additionally, as for comparative specimens, several projection mesh models of RAC were also set up to prove the accuracy and efficiency of this model. Further, a two-dimensional (2D) element was introduced to simulate the ITZ element, which is degenerated from a three-dimensional (3D) element on the base force element method (BFEM). Hereafter, these RAC models were subjected to a displacement loading to simulate the uniaxial compression and tension tests based on the BFEM. The effect of ITZ thickness on the compressive strength, tensile strength, peak/ultimate strain, and crack development was studied. Besides, the influence of the relative properties between ITZs and the corresponding mortar was also investigated. The obtained results demonstrate that the present model is an efficient way to analyze the influence law of ITZ. Besides, the multiple influencing factors can be fixed via this model; therefore, their effects can be studied by varying one single factor at a time. The degenerate element is a new approach to investigate the element with a large aspect ratio with sufficient accuracy and efficiency. (C) 2020 Elsevier Ltd. All rights reserved.
关键词 ：
Base force element method Base force element method Complementary energy principle Complementary energy principle Degenerate element Degenerate element Interfacial transition zone Interfacial transition zone Recycled aggregate concrete Recycled aggregate concrete
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| GB/T 7714 | Wang, Yao , Peng, Yijiang , Kamel, Mahmoud M. A. et al. Modeling interfacial transition zone of RAC based on a degenerate element of BFEM [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2020 , 252 . |
| MLA | Wang, Yao et al. "Modeling interfacial transition zone of RAC based on a degenerate element of BFEM" . | CONSTRUCTION AND BUILDING MATERIALS 252 (2020) . |
| APA | Wang, Yao , Peng, Yijiang , Kamel, Mahmoud M. A. , Gong, Linqi . Modeling interfacial transition zone of RAC based on a degenerate element of BFEM . | CONSTRUCTION AND BUILDING MATERIALS , 2020 , 252 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Since recycled aggregate concrete (RAC) is valuable for green concrete and global sustainability, it has attracted many numerical research studies as a five-phase material in mesolevel. In this study, the digital image processing (DIP) technique is used to obtain the real aggregate and mortar distribution of recycled concrete specimens. By applying the DIP MATLAB model, the real mesoheterogeneity of RAC is well represented. Based on the base force element method (BFEM), a mesomechanical model is constructed to simulate the uniaxial tension and compression tests of recycled concrete specimens subjected to displacement loads. The damage and the cracking mechanisms of RAC are analyzed in the mesolevel. Moreover, the failure process and the failure mode are investigated. Results indicate the nonlinearity deformation, stress redistribution, and cracks propagation of RAC. The stress-strain curve, fracture energy, and fracture distribution are also figured. The comparative analysis between the simulation and the experimental results of in situ RAC samples shows the applicability of the model; therefore, the failure mechanism is revealed. It also extends the application of the BFEM in the field of failure mechanism analysis of RAC as a heterogeneous composite material.
关键词 ：
base force element method (BFEM) base force element method (BFEM) digital image processing (DIP) digital image processing (DIP) mesodamage model mesodamage model numerical analysis concrete numerical analysis concrete recycled aggregate concrete (RAC) recycled aggregate concrete (RAC)
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| GB/T 7714 | Peng, Yijiang , Ying, Liping , Kamel, Mahmoud M. A. et al. Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique [J]. | STRUCTURAL CONCRETE , 2020 . |
| MLA | Peng, Yijiang et al. "Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique" . | STRUCTURAL CONCRETE (2020) . |
| APA | Peng, Yijiang , Ying, Liping , Kamel, Mahmoud M. A. , Wang, Yao . Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique . | STRUCTURAL CONCRETE , 2020 . |
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