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Performance of fixed beam without interacting bars
Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Mohammad Ali NAGHSH, Mohammreza MOHAMMAD KHANI
《结构与土木工程前沿(英文)》 2020年 第14卷 第5期 页码 1180-1195 doi: 10.1007/s11709-020-0661-0
关键词: transferred stress system bending capacity crack opening crack propagation FE nonlinear model stress distribution
Leakage location system for oil pipeline on basis of stress wave detection
WANG Bangfeng, CHEN Renwen
《机械工程前沿(英文)》 2008年 第3卷 第3期 页码 307-312 doi: 10.1007/s11465-008-0047-9
Air bearing center cross gap of neutron stress spectrometer sample table support system
Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 403-411 doi: 10.1007/s11465-016-0405-y
A support system is the main load-bearing component of sample table for neutron stress spectrometer, and air bearing is an important element of a support system. The neutron stress spectrometer sample table was introduced, and the scheme for air bearing combination was selected. To study the performance of air bearing center cross gap, finite element models (FEMs) were established based on air motion and Reynolds equations, effects of air supply pressure, and gap parameters on the overturning moment and bearing capacity of air bearing center cross gap were analyzed. Results indicate that the width, depth, and height differences of the marble floor gap played important roles in the performance of the air bearing. When gap width is lesser than 1 mm and gap depth is lower than 0.4 mm, bearing capacity and overturning moment would vary rapidly with the variation of the width and depth. A gap height difference results in the bearing capacity dropping rapidly. The FEM results agree well with experimental results. Further, findings of the study could guide the design of the support system and marble floor.
关键词: neutron stress spectrometer sample table support system air bearing center cross gap simulation experiment
Pengfei LI; Jinquan ZHANG; Shengqi MEI; Zhenhua DONG; Yan MAO
《结构与土木工程前沿(英文)》 2022年 第16卷 第2期 页码 239-249 doi: 10.1007/s11709-021-0804-y
关键词: vehicle-bridge vibration system dynamic analysis stress-dependent damping energy dissipation
Dynamics analysis of bladder-urethra system based on CFD
Qinghua JIN, Xiaojun ZHANG, Xiaoyang LI, Jianliu WANG,
《机械工程前沿(英文)》 2010年 第5卷 第3期 页码 336-340 doi: 10.1007/s11465-010-0027-8
关键词: bladder-urethra system stress urinary incontinence (SUI) computational fluid dynamics (CFD) urodynamics
Experimental study on film combustion formed by spirally fluted horizontal tube
MEI Ning, ZHANG Bin, ZHAO Jian, ZHANG Ming
《能源前沿(英文)》 2008年 第2卷 第1期 页码 54-58 doi: 10.1007/s11708-008-0023-4
关键词: homogeneous transferred evaporation micro-combustion efficiency
Performance of a novel bent-up bars system not interacting with concrete
Aydin SHISHEGARAN, Mohammad Reza GHASEMI, Hesam VARAEE
《结构与土木工程前沿(英文)》 2019年 第13卷 第6期 页码 1301-1315 doi: 10.1007/s11709-019-0552-4
关键词: bending capacity rubber tube stress transfer bent-up bars ductility cracking
Wenbin LI, Hiromasa SAKAI, Shota HARADA, Yasushi TAKASE, Nao-Aki NODA
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 277-286 doi: 10.1007/s11465-011-0234-y
Steel conveying rollers used in hot rolling mills must be exchanged frequently at great cost because hot conveyed strips induce wear and deterioration on the surface of roller in short periods. In previous studies, new roller structure was considered which has a ceramics sleeve connected with two steel shafts at both ends by shrink fitting. Here, although the ceramics sleeve can be used for many years, the steel shafts sometimes have to be exchanged for maintenance and reconstruction under the corrosive atmosphere. Since the thermal expansion coefficient of steel is about five times larger than that of ceramics, it is necessary to investigate how to separate the shrink fitting system by heating outside of sleeve and cooling inside of the shaft. Although how to separate the real roller has been discussed in the previous study, the separation mechanism has not been clarified yet. Therefore, in this study, several types of more fundamental models are investigated to understand the separation mechanism of real roller by the application of the finite element method. The results may be useful for designs of new rollers.
关键词: contact ceramics thermal stress heating finite element method
EFFECTS OF TRANSPORT STRESS ON THE INTESTINES INVOLVING NEURONAL NITRIC OXIDE SYNTHASE
《农业科学与工程前沿(英文)》 页码 285-295 doi: 10.15302/J-FASE-2022469
● Transport stress declined the level of leukocytes including lymphocytes in rat serum.
Analysis on annealing-induced stress of blind-via TSV using FEM
Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO
《机械工程前沿(英文)》 2018年 第13卷 第3期 页码 401-410 doi: 10.1007/s11465-017-0457-7
Copper-filled through silicon via (TSV) is a promising material owing to its application in high-density three-dimensional (3D) packaging. However, in TSV manufacturing, thermo-mechanical stress is induced during the annealing process, often causing reliability issues. In this paper, the finite element method is employed to investigate the impacts of via shape and SiO2 liner uniformity on the thermo-mechanical properties of copper-filled blind-via TSV after annealing. Top interface stress analysis on the TSV structure shows that the curvature of via openings releases stress concentration that leads to ~60 MPa decrease of normal stresses, sxx and syy, in copper and ~70 MPa decrease sxx of in silicon. Meanwhile, the vertical interface analysis shows that annealing-induced stress at the SiO2/Si interface depends heavily on SiO2 uniformity. By increasing the thickness of SiO2 linear, the stress at the vertical interface can be significantly reduced. Thus, process optimization to reduce the annealing-induced stress becomes feasible. The results of this study help us gain a better understanding of the thermo-mechanical behavior of the annealed TSV in 3D packaging.
关键词: through silicon via (TSV) annealing-induced stress interface stress plastic deformation finite element method
An investigation on stress distribution effect on multi- piezoelectric energy harvesters
Hailu YANG, Dongwei CAO
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 301-307 doi: 10.1007/s11709-017-0404-z
关键词: piezoelectric transducer uneven stress impedance matching optimal energy output
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
张亦良,徐金泉,王羽辞
《中国工程科学》 2009年 第11卷 第8期 页码 38-43
针对石化特种设备中硫化氢(H2S)应力腐蚀问题现状,综合比较了国际权威机构NACE,EFC以及ISO发布的最新标准、规范,对H2S应力腐蚀的环境界定、试验方法、影响因素、应力腐蚀评价准则及对材料的要求等做了扼要的综述。同时对焊接残余应力的产生、测定方法、消除措施等进行了论述,列举了实际参与研究的发生应力腐蚀容器的实例及残余应力的影响。
Magnetostriction varieties and stress relief caused by pulsed magnetic field
Zhipeng CAI, Xinjie DUAN, Jian LIN, Haiyan ZHAO
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 354-358 doi: 10.1007/s11465-011-0123-4
Magnetostriction is investigated to evaluate the stress relief caused by pulsed magnetic field treatment, because this physical property is closely associated with residual stress. Magnetostriction of different stressed samples is measured in this paper. The stress variations caused by pulsed magnetic treatment are also compared. It is found that magnetostriction variations are closely associated with stress changes. Thermodynamic potential is used to find the relationship between them. Based on several assumptions, we find that the product of magnetostriction amplitude and stress magnitude is nearly a constant during magnetic field treatment, which is valuable for stress relief evaluation and optimizing processing parameters. This conclusion is testified by stress measurements, and the calculated values are in accordance with the experiment results.
关键词: magnetostriction pulsed magnetic field treatment stress relief
Elastic modulus and thermal stress in coating during heat cycling with different substrate shapes
Daniel GAONA,Alfredo VALAREZO
《机械工程前沿(英文)》 2015年 第10卷 第3期 页码 294-300 doi: 10.1007/s11465-015-0351-0
The elastic modulus of a deposit (Ed) can be obtained by monitoring the temperature (?T) and curvature (?k) of a one-side coated long plate, namely, a one-dimensional (1D) deformation model. The aim of this research is to design an experimental setup that proves whether a 1D deformation model can be scaled for complex geometries. The setup includes a laser displacement sensor mounted on a robotic arm capable of scanning a specimen surface and measuring its deformation. The reproducibility of the results is verified by comparing the present results with Stony Brook University Laboratory’s results. The ?k-?T slope error is less than 8%, and the Ed estimation error is close to 2%. These values reveal the repeatability of the experiments. Several samples fabricated with aluminum as the substrate and 100MXC nanowire (Fe and Cr alloy) as the deposit are analyzed and compared with those in finite element (FE) simulations. The linear elastic behavior of 1D (flat long plate) and 2D (squared plate) specimens during heating/cooling cycles is demonstrated by the high linearity of all ?k-?T curves (over 97%). The Ed values are approximately equal for 1D and 2D analyses, with a median of 96 GPa and standard deviation of 2 GPa. The correspondence between the experimental and simulated results for the 1D and 2D specimens reveals that deformation and thermal stress in coated specimens can be predicted regardless of specimen geometry through FE modeling and by using the experimental value of Ed. An example of a turbine-blade-shaped substrate is presented to validate the approach.
关键词: in-plane Young’s modulus curvature temperature thermal stress coating
标题 作者 时间 类型 操作
Performance of fixed beam without interacting bars
Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Mohammad Ali NAGHSH, Mohammreza MOHAMMAD KHANI
期刊论文
Leakage location system for oil pipeline on basis of stress wave detection
WANG Bangfeng, CHEN Renwen
期刊论文
Air bearing center cross gap of neutron stress spectrometer sample table support system
Yang LI,Yunxin WU,Hai GONG,Xiaolei FENG
期刊论文
Numerical analysis of vehicle-bridge coupling vibration concerning nonlinear stress-dependent damping
Pengfei LI; Jinquan ZHANG; Shengqi MEI; Zhenhua DONG; Yan MAO
期刊论文
Dynamics analysis of bladder-urethra system based on CFD
Qinghua JIN, Xiaojun ZHANG, Xiaoyang LI, Jianliu WANG,
期刊论文
Experimental study on film combustion formed by spirally fluted horizontal tube
MEI Ning, ZHANG Bin, ZHAO Jian, ZHANG Ming
期刊论文
Performance of a novel bent-up bars system not interacting with concrete
Aydin SHISHEGARAN, Mohammad Reza GHASEMI, Hesam VARAEE
期刊论文
Separation mechanism for double cylinder with shrink fitting system used for ceramics conveying rollers
Wenbin LI, Hiromasa SAKAI, Shota HARADA, Yasushi TAKASE, Nao-Aki NODA
期刊论文
Analysis on annealing-induced stress of blind-via TSV using FEM
Jie SHAO, Tielin SHI, Li DU, Lei SU, Xiangning LU, Guanglan LIAO
期刊论文
An investigation on stress distribution effect on multi- piezoelectric energy harvesters
Hailu YANG, Dongwei CAO
期刊论文
Magnetostriction varieties and stress relief caused by pulsed magnetic field
Zhipeng CAI, Xinjie DUAN, Jian LIN, Haiyan ZHAO
期刊论文