Safety Detection and Assessment of Aqueduct Supporting Structure under Lateral Impact Load by LI Jun, CUI Dehao, YOU Ri, HAO Jie, PAN Wenming

“…In view of the structural damage of an aqueduct pile-pillar supporting structure caused by ship collisions,relevant engineering data were collected,and on-site detection and monitoring analysis were carried out.In addition,the finite element method was used to establish a three-dimensional entity analytical model of the aqueduct pile-pillar structure.Under the joint action of the coupled foundation and pile foundation and superstructure,numerical simulation and calculation analysis were carried out on the pile-pillar collision process.The distribution and characteristics of the damage of the supporting structure caused by collisions were studied and verified.The finite element numerical simulation results show that the high-stress area of the aqueduct pile-pillar structure during the ship collision process can be divided into two categories according to the cause.One is the high-stress area caused by the direct contact load,which occurs in the collision contact surface and the adjacent area between the ship in a collision and the bearing platform,and the other is caused by the overall bending deformation of the pile-pillar structure,which occurs in the dangerous section of the pile-pillar structure and the bearing platform connection.In addition,the simulation analysis and on-site detection results are consistent.By assessing the influence of ship collisions and checking the potential safety hazards of the aqueduct,the research results lay a foundation for the maintenance,reinforcement,and design of the aqueduct.…”
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STUDY ON CONSTRAINT OF MIXED MODE CRACK AND FAILURE ASSESSMENT DIAGRAM OF PRESSURE-BEARING STRUCTURE by MIAO XinTing, ZHANG JinBo, LIU GuoXu, PENG Jian, BIE FengFeng

“…The crack tip constraint and failure assessment diagram （FAD） in both plate specimen and pipe structure were the focus of analysis， with the goal of studying compatibility and correlation of between the two.Based on the finite element method，constraints at crack tip of central cracked plate （CCP） specimen and cracked pressure pipe were obtained.It was found that crack tip constraint of CCP specimen under uniaxial loading is better matched with thick-walled pipeline under axial tensile loading，while CCP specimen under biaxial loading is better matched with thin-walled pipeline under internal pressure.In addition，the failure assessment diagram of CCP specimen and pipeline were obtained.It was found that FAD of CCP specimen is less related with thickness，when the thickness of pipe is within the range of thick wall or thin wall； was also pointed out that stress parallel to the crack direction increases the failure assessment curve （FAC） of the structure.Finally，it is found that FAC of the central crack plate specimen is higher than that of the pressure bearing pipeline，for the two structures with the same constraint level，and crack tip mixed mode degree and loading mode.That is，it is unsafe to use FAD of CCP specimen to evaluate pipeline.…”
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Numerical analysis of hydrogen-assisted rolling-contact fatigue of wind turbine bearings by J. Toribio, M. Lorenzo, D. Vergara, V. Kharin

“…So, the widely used RCF ball-on-rod test was simulated by finite element method in order to obtain the stress-strain state inside the bearings during life in service and, from this, to elucidate the potential places where the hydrogen could be more harmful and, therefore, where the bearing material should be improved.…”
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Slope Stability Analysis under Complex Stress State with Saturated and Unsaturated Seepage Flow by Zongyuan Ma, Caihui Zhu, Xiaoliang Yao, Faning Dang

“…Firstly, an elastoplastic constituted model for the soil under a complex stress state is established and as a user subroutine of the finite element method code of FLAC. Secondly, the 2D and 3D problems of slope stability influenced by the saturated or unsaturated seepage flow are analyzed via the finite difference method with the influence of the complex stress state. …”
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A Normalized Transfer Matrix Method for the Free Vibration of Stepped Beams: Comparison with Experimental and FE(3D) Methods by Tamer Ahmed El-Sayed, Said Hamed Farghaly

“…The comparison between the NTM method and the finite element method results shows that the modal percentage deviation is increased when a beam step location coincides with a peak point in the mode shape. …”
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RESEARCH ON THE ANTI-IMPACT CHARACTERISTIC AT DIFFERENT LOCATION BETWEEN THE MOVING SHIP AND MONOPILE OFFSHORE WIND TURBINES by ZHOU HongJie, LI Chun, HAO WenXing, YU Wan

“…The explicit dynamic theory and non-linear finite element method are used to simulate the 5 000 t impact of the wind turbine at different locations of the dynamic response process, through the support structure of the stress and crash depth, tower top response analysis of wind turbine structure crash performance. …”
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Progressive Multifocal Liquid Lenses Based on Asymmetric Freeform Surface Structure of Nonuniform Thickness Elastic Membranes with Different Constraints by Weiliang Jia, Biao Zhang, Songjing Li

“…The membrane deformation and the corresponding power distribution of the lenses with asymmetric freeform surface are predicted and compared under uniform pressure load and different boundary conditions using the finite element method. An optical testing system is constructed to analyze the optical characteristics of the fabricated lenses through observing the focusing performance of the F target image at different regions of the lenses. …”
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Experimental and Numerical Vibration Analysis of Hydraulic Pipeline System under Multiexcitations by Peixin Gao, Hongquan Qu, Yuanlin Zhang, Tao Yu, Jingyu Zhai

“…A numerical MOC-FEM approach which combined the coupling method of characteristics (MOC) and finite element method (FEM) is proposed to solve the equations. …”
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Critical applied stresses for a crack initiation from a sharp V-notch by L. Náhlík, P. Hutař, K. Štegnerová

“…The value of the stress singularity exponent depends on the V-notch opening angle. The finite element method was used for a determination of stress distribution in the vicinity of the sharp V-notch tip and for the estimation of the generalized stress intensity factor depending on the V-notch opening angle. …”
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PDE Modeling of a Microfluidic Thermal Process for Genetic Analysis Application by Reza Banaei Khosroushahi, Horacio J. Marquez, Jose Martinez-Quijada, Christopher J. Backhouse

“…These equations are solved analytically, and the results are verified using an experimentally verified precise finite element method (FEM) model. The final combined result is a framework for designing a precise tracking controller applicable to the selected lab-on-a-chip device.…”
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Thermo-mechanical Coupling Simulation Analysis of Cycloid Gear Multi-tooth Form Grinding by Shi Enbing, Su Jianxin, Zhang Lifang, Deng Xiaozhong, Ren Xiaozhong, Cheng Chen

“…The cycloid gear multi-tooth form grinding is a gear finishing process，which can finish the processing of three tooth grooves at same time.In the process of high-speed grinding，high temperature will arise on the gear surface instantaneously，which may cause tooth surface burn.The temperature gradient formed by grinding temperature field will cause residual stress on the tooth surface，and the metallographic structure of cycloid gear tooth surface will change，affecting the grinding accuracy of the gear.The finite element method is used to simulate the temperature field of cycloid gear multi-tooth form grinding，and then the thermo-mechanical coupling analysis method is used to obtain the numerical simulation nephogram of the temperature field and thermal stress of cycloid gear form grinding.Through the analysis of the main stress of the grinding area，it can be seen that the stress is mainly concentrated at the grinding center near the root of the tooth，and the grinding area presents hot-pressing stress.In the ground area，the hot-pressing stress is converted into thermal tensile stress and gradually forms residual tensile stress，and the node stress also changes correspondingly with the change of grinding process parameters.The conclusion has certain research significance for predicting the distribution of temperature and thermal stress field during multi-tooth form grinding and reasonably selecting grinding process parameters.…”
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Effects of Gravity and Inlet/Outlet Location on a Two-Phase Cocurrent Imbibition in Porous Media by M. F. El-Amin, Shuyu Sun

“…Two-dimensional computations are carried out using the finite element method. Intensive comparisons are done between considering and neglecting gravity effect on water saturation, pressures of water and oil as well as water velocity. …”
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Behavior of Zr�1Nb alloy in coarse- and ultrafine-grain states under laser-induced shock wave loading by Dmitry Ledon, Aleksandr Balakhnin, Sergey Uvarov, Irina Bannikova, Yuriy Bayandin, Oleg Naimark

“…Numerical simulation of the process under study has been carried out using statistically based nonlinear model of solid with defects and finite element method to describe the deformation behavior and fracture of the material under shock-wave loading. …”
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IMPROVEMENT ALGORITHM OF TIME-VARYING MESHING STIFFNESS OF HELICAL GEAR AND ANALYSIS OF INFLUENCING FACTORS by WU LuJi, YANG ShiHao, FENG Wei, YANG LinJie

“…This method considered the parameter equation of the transition curve of the real tooth root, corrected the integral interval of the involute tooth profile, and compared with the finite element method to verify the validity of the algorithm and reduce the calculation error of the time-varying mesh stiffness. …”
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Effect of Variable Thermal Conductivity on the Generalized Thermoelasticity Problems in a Fiber-Reinforced Anisotropic Half-Space by Chun-Bao Xiong, Li-Na Yu, Yan-Bo Niu

“…The time-domain finite element method is applied to analyze the nonlinear problem and derives the governing equations. …”
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Integrated Taguchi method‐assisted polynomial Metamodelling & Genetic Algorithm based optimisation of a surface inset permanent synchronous motor for performance improvement by Monika Verma, Madhusudan Singh, Mini Sreejeth

“…The motor geometry is analysed by implementing the finite element method for application of the motor in electric compressors of the cooling system of an electric vehicle (EV). …”
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Unbalance Identification of Speed-Variant Rotary Machinery without Phase Angle Measurement by Cong Yue, Xingmin Ren, Yongfeng Yang, Wangqun Deng

“…The latter study in this paper is subsequently put forward through a power turbine rotor modeled by finite element method. Simulation results show that proper equilibrium plane performs commendably in recognizing residual unbalance and reducing the vibration effect through the critical region. …”
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Numerical Analysis of Pipelines Settlement Induced by Tunneling by KunYong Zhang, Jose Luis Chavez Torres, ZhenJun Zang

“…Three-dimensional finite element method analysis on the tunnel-soil-underground pipeline was carried out based on the ABAQUS program. …”
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Buoyancy-driven flow for surface reaction on vertical walls in multilayered open cavities by Nepal Chandra Roy

“…Then, those are solved utilizing the finite element method (FEM), and the stream function is calculated from the Poisson equation. …”
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Performance analysis of asymmetrical less‐rare‐earth permanent magnet motor for electric vehicle by Bingchang Lv, Liwei Shi, Lintao Li, Kaiwen Liu, Jianning Jing

“…Electromagnetic performance of the TPMM structure and the ALREPMM structure is compared by finite element method‐based simulation. It is shown that the ALREPMM structure can reduce the amount of rare‐earth materials by 19%, and the cogging torque and the THD values of no‐load back‐EMF are reduced by 77.3% and 26.8%, respectively. …”
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