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Seismic performance of precast bridge columns connected with grouted corrugated-metal duct through biaxial quasi-static experiment and modeling

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 747-770页

作者： Xia Zhanghua Lin Shangshun He Yongbo Ge Jiping Sun Jinlei Department of Civil Engineering Fuzhou UniversityFuzhou 350116China Department of Civil Engineering Fujian University of TechnologyFuzhou 350116China Department of Civil Engineering Shanghai Institute of TechnologyShanghai 201418China

In this paper,the seismic behaviors of precast bridge columns connected with grouted corrugated-metal duct(GCMD)were investigated through the biaxial quasi-static experiment and numerical *** a geometric scale ratio of 1:5,five specimens were fabricated,including four precast bridge columns connected with GCMD and one cast-in-place(CIP)bridge column.A finite element analysis model was also established by using OpenSees and was then calibrated by using the experimental results for parameter *** results show the biaxial seismic performance of the precast bridge columns connected with GCMD was similar to the CIP bridge columns regarding ultimate bearing capacity and hysteresis energy,and further,that it could meet the design goal of equivalent *** seismic performance of the precast bridge columns connected with GCMD deteriorated more significantly under bi-directional load than under uni-directional load.A proper slenderness ratio(e.g.,7.0-10.0)and longitudinal reinforcement ratio could significantly improve the energy dissipation capacity and deformation capacity of the precast bridge columns,while the axial load ratio and concrete strength had little influence on the above *** research results could bring insights to the development of the seismic design of precast bridge columns connected with GCMD.

关键词： precast bridge column cast-in-place column grouted corrugated-metal duct connection biaxial quasi-static test seismic performance hysteresis energy

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Strain-controlled fatigue characteristics of a cast Mg-Nd-Zn under peak-aged and over-aged conditions

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Rare Metals 2023年第7期42卷 2381-2389页

作者： Zhen-Ming Li Ji-Chun Dai Bao-Liang Liu Hui Zou Ji-Peng Pan Institute of Sci-technology Strategy Jiangxi Academy of SciencesNanchang330096China Zhejiang Jinfei Kaida Wheel Co. LtdJinhua321000China Research Institute(R&D Center) Shanghai JuneBang Technology CorporationShanghai200032China National Engineering Research Center of Light Alloy Net Forming Shanghai200240China National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong UniversityShanghai200240China

Strain-controlled fatigue characteristics of peakaged and over-aged Mg_(96.47)Nd_(2.9)Zn_(0.21)magnesium alloys containing 0.42Zr,including stress response,strain resistance,hysteresis loops,strain-life and corresponding lowcycle fatigue life prediction model,were *** the peak-aged state(T61:540℃×8 h+200℃×14 h),the alloy shows higher cyclic stress response,but lower ductility than the alloy in the over-aged state(T6_(2):540℃×8 h+200℃×400 h).The yield strength and ultimate tensile strength of the alloy under T6_(1)-and T6_(2)-treated conditions are *** with T6_(1)-treated alloy,the steady stress amplitude occurred in T6_(2)-treated alloy is due to higher ductility and more homogenous *** T6_(1)state,the fatigue cracks in the alloy first initiate along the cracked persistent slip bands and then propagate in the trans-granular mode,while in the T6_(2)state,the fatigue cracks initiate along grain boundaries and then propagate in the inter-granular mode.

关键词： Mg-Nd-Zn alloy Strain-controlled fatigue Peak-aged and over-aged conditions hysteresis energy

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Fatigue damage behavior of a surface-mount electronic package under different cyclic applied loads

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Chinese Physics B 2014年第4期23卷 377-384页

作者：任淮辉王习术 Longyuan Beijing) Wind Power Engineer Technology Co. Ltd Department of Engineering Mechanics Tsinghua University

This paper studies and compares the effects of pull-pull and 3-point bending cyclic loadings on the mechanical fa- tigue damage behaviors of a solder joint in a surface-mount electronic package. The comparisons are based on experimental investigations using scanning electron microscopy （SEM） in-situ technology and nonlinear finite element modeling, respec- tively. The compared results indicate that there are different threshold levels of plastic strain for the initial damage of solder joints under two cyclic applied loads; meanwhile, fatigue crack initiation occurs at different locations, and the accumulation of equivalent plastic strain determines the trend and direction of fatigue crack propagation. In addition, simulation results of the fatigue damage process of solder joints considering a constitutive model of damage initiation criteria for ductile materials and damage evolution based on accumulating inelastic hysteresis energy are identical to the experimental results. The actual fatigue life of the solder joint is almost the same and demonstrates that the FE modeling used in this study can provide an accurate prediction of solder joint fatigue failure.

关键词： solder joint fatigue life hysteresis energy SEM in-situ technology

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Low-cycle Fatigue Properties of an Ultrafine-grained Magnesium Alloy Processed by Equal-channel Angular Pressing

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1029-1032页

作者：朱荣 WU Yanjun JI Wenqing Department of Materials Science and Engineering Nanjing University of Science and Technology Nanjing Communications Institute of Technology Nanjing 211188China

Magnesium alloy Mg-3%Al-1%Zn （AZ31） billets prepared from equal channel angular pressing （ECAP） were utilized in low-cycle fatigue tests in order to investigate their fatigue life. Fully reversed strain-controlled tension-compression fatigue tests were conducted at the frequency of 1 Hz in ambient air. The microstructures were examined by optical microscopy （OM） and scanning electron microscopy （SEM）. The hysteresis loops of the ECAP processed and conventionally extruded samples display obviously different shapes in the total strain amplitude range from 0.2% to 0.6%. Accordingly, the low cycle fatigue lives of ECAP processed samples are found to be longer than those of extruded samples, which can be attributed to the different in the hysteresis energy incorporating tensile strain energy.

关键词： magnesium alloy low cycle fatigue hysteresis energy fatigue life ECAP

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