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Experiment and optimal design of a collection device for a residual plastic film baler
Qi NIU,Xuegeng CHEN,Chao JI,Jie WU
《农业科学与工程前沿(英文)》 2015年 第2卷 第4期 页码 347-354 doi: 10.15302/J-FASE-2015077
关键词: residual film collection device collection rate of residual film impurity of film package optimization baler
Lizhao DAI; Wengang XU; Lei WANG; Shanchang YI; Wen CHEN
《结构与土木工程前沿(英文)》 2022年 第16卷 第3期 页码 388-400 doi: 10.1007/s11709-022-0809-1
关键词: post-tensioned concrete beams strand fracture secondary transfer length residual prestress
Minimal residual disease in solid tumors: an overview
《医学前沿(英文)》 2023年 第17卷 第4期 页码 649-674 doi: 10.1007/s11684-023-1018-6
关键词: MRD solid tumor CTC ctDNA
The formation mechanism and the influence factor of residual stress in machining
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 265-269 doi: 10.1007/s11465-014-0311-0
Residual stresses generated in cutting process have important influences on workpiece performance. The paper presents a method of theoretical analysis in order to explicate the formation mechanism of residual stresses in cutting. An important conclusion is drawn that the accumulated plastic strain is the main factor which determines the nature and the magnitude of surface residual stresses in the workpiece. On the basis of the analytical model for residual stress, a series of simulations for residual stress prediction during cutting AISI 1045 steel are implemented in order to obtain the influences of cutting speed, depth of cut and tool edge radius on surface residual stress in the workpiece. And these influences are explained from the perspective of formation mechanism of residual stress in cutting. The conclusions have good applicability and can be used to guide the parameters selection in actual production.
关键词: residual stress analytical model strain plastic cutting parameter
Numerical simulation of liquid falling film on horizontal circular tubes
Fengdan SUN, Songlin XU, Yongchuan GAO
《化学科学与工程前沿(英文)》 2012年 第6卷 第3期 页码 322-328 doi: 10.1007/s11705-012-1296-z
关键词: falling film horizontal tube flow characteristics film thickness liquid feeder height
Improved analytical model for residual stress prediction in orthogonal cutting
null
《机械工程前沿(英文)》 2014年 第9卷 第3期 页码 249-256 doi: 10.1007/s11465-014-0310-1
The analytical model of residual stress in orthogonal cutting proposed by Jiann is an important tool for residual stress prediction in orthogonal cutting. In application of the model, a problem of low precision of the surface residual stress prediction is found. By theoretical analysis, several shortages of Jiann’s model are picked out, including: inappropriate boundary conditions, unreasonable calculation method of thermal stress, ignorance of stress constraint and cyclic loading algorithm. These shortages may directly lead to the low precision of the surface residual stress prediction. To eliminate these shortages and make the prediction more accurate, an improved model is proposed. In this model, a new contact boundary condition between tool and workpiece is used to make it in accord with the real cutting process; an improved calculation method of thermal stress is adopted; a stress constraint is added according to the volume-constancy of plastic deformation; and the accumulative effect of the stresses during cyclic loading is considered. At last, an experiment for measuring residual stress in cutting AISI 1045 steel is conducted. Also, Jiann’s model and the improved model are simulated under the same conditions with cutting experiment. The comparisons show that the surface residual stresses predicted by the improved model is closer to the experimental results than the results predicted by Jiann’s model.
关键词: residual stress analytical model orthogonal cutting cutting force cutting temperature
Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 217-223 doi: 10.1007/s11709-012-0169-3
关键词: residual stress ductile crack growth resistance complete Gurson model eigenstrain method
雒建斌,张朝辉,温诗铸
《中国工程科学》 2003年 第5卷 第7期 页码 84-89
薄膜润滑是20世纪90年代以来广泛研究的新型润滑状态。它是界于弹流润滑和边界润滑之间的一种过渡润滑状态,有着自己独特的润滑规律。文章回顾了薄膜润滑的研究历史,包括薄膜润滑概念的提出、测试技术的发展、薄膜润滑的膜厚特性、润滑机理探索以及计算理论等方面的研究成果与主要进展。
An improved algorithm for McDowell’s analytical model of residual stress
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 150-155 doi: 10.1007/s11465-014-0295-9
The analytical model for two-dimensional elastoplastic rolling/sliding contact proposed by McDowell is an important tool for predicting residual stress in rolling/sliding processes. In application of the model, a problem of low predicting precision near the surface layer of the component is found. According to the volume-constancy of plastic deformation, an improved algorithm for McDowell’s model is proposed in order to improve its predicting accuracy of the surface residual stress. In the algorithm, a relationship between three normal stresses perpendicular to each other at any point within the component is derived, and the relationship is applied to McDowell’s model. Meanwhile, an unnecessary hypothesis proposed by McDowell can be eliminated to make the model more reasonable. The simulation results show that the surface residual stress predicted by modified method is much closer to the FEM results than the results predicted by McDowell’s model under the same simulation conditions.
关键词: residual stress McDowell’s model volume-constancy of plastic deformation FEM elastoplastic rolling/sliding contact
Thin-liquid-film evaporation at contact line
Hao WANG, Zhenai PAN, Zhao CHEN
《能源前沿(英文)》 2009年 第3卷 第2期 页码 141-151 doi: 10.1007/s11708-009-0020-2
关键词: meniscus thin film contact line disjoining pressure evaporation
Bayes estimation of residual life by fusing multisource information
Qian ZHAO, Xiang JIA, Zhi-jun CHENG, Bo GUO
《工程管理前沿(英文)》 2018年 第5卷 第4期 页码 524-532 doi: 10.15302/J-FEM-2018034
Residual life estimation is essential for reliability engineering. Traditional methods may experience difficulties in estimating the residual life of products with high reliability, long life, and small sample. The Bayes model provides a feasible solution and can be a useful tool for fusing multisource information. In this study, a Bayes model is proposed to estimate the residual life of products by fusing expert knowledge, degradation data, and lifetime data. The linear Wiener process is used to model degradation data, whereas lifetime data are described via the inverse Gaussian distribution. Therefore, the joint maximum likelihood (ML) function can be obtained by combining lifetime and degradation data. Expert knowledge is used according to the maximum entropy method to determine the prior distributions of parameters, thereby making this work different from existing studies that use non-informative prior. The discussion and analysis of different types of expert knowledge also distinguish our research from others. Expert knowledge can be classified into three categories according to practical engineering. Methods for determining prior distribution by using the aforementioned three types of data are presented. The Markov chain Monte Carlo is applied to obtain samples of the parameters and to estimate the residual life of products due to the complexity of the joint ML function and the posterior distribution of parameters. Finally, a numerical example is presented. The effectiveness and practicability of the proposed method are validated by comparing it with residual life estimation that uses non-informative prior. Then, its accuracy and correctness are proven via simulation experiments.
关键词: residual life estimation Bayes model linear Wiener process
《化学科学与工程前沿(英文)》 2022年 第16卷 第5期 页码 564-591 doi: 10.1007/s11705-021-2109-z
关键词: reverse osmosis polyamide thin film composite membranes chlorine resistance surface modification
Piezoelectric film-actuated motion platform with high resolution
HUA Shunming, ZHANG Hongzhuang, CHENG Guangming, FAN Zunqiang, LIU Jianfang
《机械工程前沿(英文)》 2008年 第3卷 第3期 页码 265-269 doi: 10.1007/s11465-008-0041-2
关键词: mathematical stick-slip mechanism piezoelectric film-actuated analysis terrific
Xinyu HUI, Yingjie XU, Weihong ZHANG
《机械工程前沿(英文)》 2020年 第15卷 第3期 页码 475-483 doi: 10.1007/s11465-020-0590-6
关键词: CFRP curing residual stress multiscale modeling finite element method
Wendong WANG, Hua LI, Zhenzhen DING, Xiaochang WANG, Rui LIU
《环境科学与工程前沿(英文)》 2012年 第6卷 第4期 页码 470-476 doi: 10.1007/s11783-012-0422-y
关键词: coagulation drinking water humic acid orthophosphate residual Al
标题 作者 时间 类型 操作
Experiment and optimal design of a collection device for a residual plastic film baler
Qi NIU,Xuegeng CHEN,Chao JI,Jie WU
期刊论文
Secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams
Lizhao DAI; Wengang XU; Lei WANG; Shanchang YI; Wen CHEN
期刊论文
Numerical simulation of liquid falling film on horizontal circular tubes
Fengdan SUN, Songlin XU, Yongchuan GAO
期刊论文
Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked
Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG
期刊论文
Bayes estimation of residual life by fusing multisource information
Qian ZHAO, Xiang JIA, Zhi-jun CHENG, Bo GUO
期刊论文
Surface-tailoring chlorine resistant materials and strategies for polyamide thin film composite reverse
期刊论文
Piezoelectric film-actuated motion platform with high resolution
HUA Shunming, ZHANG Hongzhuang, CHENG Guangming, FAN Zunqiang, LIU Jianfang
期刊论文
Multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer
Xinyu HUI, Yingjie XU, Weihong ZHANG
期刊论文