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Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0702-6
关键词: creep life assessment brazed joint continuum damage mechanics aeroengine recuperator
杨晓华,姚卫星,段成美
《中国工程科学》 2003年 第5卷 第4期 页码 81-87
著名的Miner-Palmgren线性累积损伤理论的提出已有70余年,但由于疲劳问题的复杂性,迄今为止还没有一个模型的工程应用价值能与该理论媲美。疲劳累积损伤理论仍在发展与完善中。文章根据疲劳损伤与疲劳累积损伤理论的特点,将确定性疲劳累积损伤理论分成两大类,即线性累积损伤理论和非线性累积损伤理论,并将主要的非线性累积损伤理论分成五类:a. 基于损伤曲线法的非线性累积损伤理论;b. 基于材料物理性能退化概念的非线性累积损伤理论;c. 基于连续损伤力学概念的非线性累积损伤理论;d. 考虑载荷间相互作用效应的非线性累积损伤理论;e. 基于能量法的非线性累积损伤理论。文章分析了每一类模型中有代表性模型的物理背景,回答了模型在疲劳累积损伤理论中存在的主要问题,简要评述了模型的优缺点,讨论了确定性疲劳累积损伤理论的几个关键问题。
周宁,任辉启,沈兆武,刘瑞朝
《中国工程科学》 2006年 第8卷 第8期 页码 56-60
根据实验得到的运动弹丸在多层复合介质中不同深度爆炸时产生的弹坑形状、体积及破坏面积,对破坏效应进行了理论分析,建立了弹丸在多层复合介质中的爆炸破坏分区;考虑主要影响破坏效果因素条件下应用量纲分析方法,并结合实验数据得到了破坏参数与比炸深的无量纲关系式和关系曲线,由这些曲线能够方便地查找所需最佳破坏效果对应的比炸深,在相同条件下,该结果可推广到类似目标的爆炸破坏效应分析。
Design and modeling of continuum robot based on virtual-center of motion mechanism
《机械工程前沿(英文)》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0739-6
关键词: VCM mechanism continuum robot flexural joint pseudo-rigid body model cable-driven
Comprehensive kinetostatic modeling and morphology characterization of cable-driven continuum robots
《机械工程前沿(英文)》 2023年 第18卷 第3期 doi: 10.1007/s11465-023-0756-0
关键词: kinetostatic modeling morphology characterization variable friction continuum robots in-situ maintenance
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
Layout optimization of steel reinforcement in concrete structure using a truss-continuum model
《结构与土木工程前沿(英文)》 2023年 第17卷 第5期 页码 669-685 doi: 10.1007/s11709-023-0963-0
关键词: bi-directional evolutionary structural optimization steel-reinforced concrete concrete stress reinforcement method hybrid model
Meng DUAN, Jin XIE, Xiaomin MAO
《农业科学与工程前沿(英文)》 2019年 第6卷 第2期 页码 144-161 doi: 10.15302/J-FASE-2019258
Based on our previous work modeling crop growth (CropSPAC) and water and heat transfer in the soil-plant-atmosphere continuum (SPAC), the model was improved by considering the effect of plastic film mulching applied to field-grown maize in North-west China. In CropSPAC, a single layer canopy model and a multi-layer soil model were adopted to simulate the energy partition between the canopy and water and heat transfer in the soil, respectively. The maize growth module included photosynthesis, growth stage calculation, biomass accumulation, and participation. The CropSPAC model coupled the maize growth module and SPAC water and heat transfer module through leaf area index (LAI), plant height and soil moisture condition in the root zone. The LAI and plant height were calculated from the maize growth module and used as input for the SPAC water and heat transfer module, and the SPAC module output for soil water stress conditions used as an input for maize growth module. We used , the representation of evaporation resistance, instead of the commonly used evaporation resistance to reflect the change of latent heat flux of soil evaporation under film mulching as well as the induced change in energy partition. The model was tested in a maize field at Yingke irrigation area in North-west China. Results showed reasonable agreement between the simulations and measurements of LAI, above-ground biomass and soil water content. Compared with the original model, the modified model was more reliable for maize growth simulation under film mulching and showed better accuracy for the LAI (with the coefficient of determination = 0.92, the root mean square of error RMSE= 1.23, and the Nush-Suttclife efficiency E = 0.87), the above-ground biomass (with = 0.96, RMSE= 7.17 t·ha and E = 0.95) and the soil water content in 0–1 m soil layer (with = 0.78, RMSE= 49.44 mm and E = 0.26). Scenarios were considered to simulate the influence of future climate change and film mulching on crop growth, soil water and heat conditions, and crop yield. The simulations indicated that the change of LAI, leaf biomass and yield are negatively correlated with temperature change, but the growing degree-days, evaporation, soil water content and soil temperature are positively correlated with temperature change. With an increase in the ratio of film mulching area, the evaporation will decrease, while the impact of film mulching on crop transpiration is not significant. In general, film mulching is effective in saving water, preserving soil moisture, increasing soil surface temperature, shortening the potential growth period, and increasing the potential yield of maize.
关键词: film mulching growth stage leaf area index maize growth water and heat transfer
Progressive failure analysis of notched composite plate by utilizing macro mechanics approach
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 623-642 doi: 10.1007/s11709-021-0726-8
关键词: progressive failure notched composite plate Hashin failure criterion macro mechanics approach finite element method
Study of the mechanics of progressive collapse of FPB isolated beam-pier substructures
Jingcai ZHANG; Yong DING; Xinchun GUAN
《结构与土木工程前沿(英文)》 2022年 第16卷 第6期 页码 718-728 doi: 10.1007/s11709-022-0815-3
关键词: friction pendulum bearing progressive collapse horizontal stiffness compressive arching action catenary action
Advances in structural mechanics of Chinese ancient architectures
YU Maohong, ODA Yoshiya, FANG Dongping, ZHAO Junhai
《结构与土木工程前沿(英文)》 2008年 第2卷 第1期 页码 1-25 doi: 10.1007/s11709-008-0002-1
郑颖人,孔亮
《中国工程科学》 2005年 第7卷 第11期 页码 21-36
分析了经典塑性力学用于岩土类材料的问题,它采用了3个不符合岩土材料变形机制的假设。从固体力学原理直接导出广义塑性位势理论,将经典塑性力学改造为更一般的塑性力学——广义塑性力学。广义塑性力学采用了塑性力学中的分量理论,能反映应力路径转折的影响,并避免了采用正交流动法则所引起的过大剪胀等不合理现象,也不会产生当前非关联流动法则中任意假定塑性势面引起的误差。给出了广义塑性力学的屈服面理论、硬化定律和应力-应变关系,并建立了考虑应力主轴旋转的广义塑性位势理论。屈服条件是状态参数,也是试验参数,只能由试验给出。应用表明,广义塑性力学可作为岩土材料的建模理论,还可应用于诸如极限分析等土力学的诸多领域,具有广阔的应用前景。
《化学科学与工程前沿(英文)》 2022年 第16卷 第2期 页码 152-167 doi: 10.1007/s11705-021-2060-z
关键词: molecular property quantum mechanics quantitative structure-property relationship heat of reaction solid-liquid phase equilibrium
标题 作者 时间 类型 操作
Comprehensive kinetostatic modeling and morphology characterization of cable-driven continuum robots
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
Modeling water and heat transfer in soil-plant-atmosphere continuum applied to maize growth under plastic
Meng DUAN, Jin XIE, Xiaomin MAO
期刊论文
Study of the mechanics of progressive collapse of FPB isolated beam-pier substructures
Jingcai ZHANG; Yong DING; Xinchun GUAN
期刊论文
Advances in structural mechanics of Chinese ancient architectures
YU Maohong, ODA Yoshiya, FANG Dongping, ZHAO Junhai
期刊论文
A computational toolbox for molecular property prediction based on quantum mechanics and quantitative
期刊论文