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Study of failure analysis and manufacturing processes improvement of cracking connecting rod
Zhen Zhang,Anyuan Jiao,Xiwei Lv,Haodong Ding 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
Herein, we provide a novel method of using finite element analysis to guide the improvement of manufacturing processes on the basis of physicochemical analysis. First, based on the theoretical analysis of the force of the connecting rod, the solid model of cracking connecting rod is established by SolidWorks. Then the static stress analysis, modal analysis and fatigue analysis are carried out by ANSYS, determining the location where the connecting rod is prone to failure. Second, the influence of processing technology and other factors on the failure of connecting rod is analyzed, and several improved schemes for the manufacturing process are proposed. Finally, the fatigue test of the connecting rod is performed to verify the effect. Compared with the unimproved connecting rod, the tension and pressure of the improved connecting rod increased to 92.34 KN and -425.7 KN, respectively. The safety factor under this load is 1.8, which has increased by 20 % compared to 1.5 before the improvement.
Yufeng Qi,Haodong Wu,Conghui Liu,Danni Zheng,Congzhi Yan,Wenjing Hu,Xiaohua Zhang,Xuanxuan Dai 한국유방암학회 2022 Journal of breast cancer Vol.25 No.4
Purpose: The incidence rate of breast cancer (BC) has increased annually. Downstream neighbor of son (DONSON) critically affects cell cycle progression and maintains stable genomic properties; however, its relevant effects on BC growth and progression require in-depth investigation. Methods: DONSON upregulation was validated in public databases. DONSON expression in matched BC and adjacent tissues and cell lines (MDA-MB-231, BT-549, and HS-578T) was determined using quantitative reverse transcription polymerase chain reaction. In vitro apoptosis, invasion, migration, and proliferation tests were performed to ascertain the functions of DONSON in BC cell lines. Then, using western blot analysis, the levels of DONSON downstream proteins were determined. Results: Compared to the control, DONSON was expressed at higher levels in BC tissues and cell lines. DONSON knockdown facilitated apoptosis and limited proliferation, migration, invasion, and S/G2 transition of BC cells in vitro. Furthermore, DONSON overexpression promoted BC cell proliferation and inhibited apoptosis in vitro. Moreover, DONSON knockdown reduced cyclin A1 and cyclin-dependent kinase 2 levels. Moreover, DONSON knockdown limited the progression of epithelial-mesenchymal transition. Conclusion: DONSON critically affects BC growth and serves as a possible target and marker for the efficacy of subsequent therapies.
Zhenya Duan,Haodong Zhang,Bin Liu,Zhiwei Sun,Junmei Zhang,Longlong Lin 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
Based on the fact that the distance between the heat exchange surfaces has little influence on the separation efficiency in the short-path distillation, a hypothesis that the heat and mass transfer process in the transition region is controlled by heat convection is proposed; the gas-liquid state in the transition zone was calculated by numerical simulation experiment. The results show that the gas-liquid volume fraction and temperature fluctuation in the evaporation and condensation process is unstable, while the gas-liquid volume fraction and temperature fluctuation in the transition zone is stable in the short-path distillation process. It can be concluded that in unsteady thermodynamics, the transition zone is a stable convective heat transfer process that is not affected by the distance between heat transfer surfaces. Thus, under ideal conditions, the continuous extension of the transition region has little effect on the distillation efficiency.
Generalized Stability Criterion for Multi-module Distributed DC System
Liu, Fangcheng,Liu, Jinjun,Zhang, Haodong,Xue, Danhong The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The stability issues of a multi-module distributed DC power system without current-sharing loop are analyzed in this study. The physical understanding of the terminal characteristics of each sub-module is focused on. All the modules are divided into two groups based on the different terminal property types, namely, impedance (Z) and admittance (Y) types. The equivalent circuits of each group are established to analyze the stability issues, and the mathematical equations of the equivalent circuits are derived. A generalized criterion for multi-module distributed systems is proposed based on the stability criterion in a cascade system. The proposed criterion is independent of the power flow direction.
Generalized Stability Criterion for Multi-module Distributed DC System
Fangcheng Liu,Jinjun Liu,Haodong Zhang,Danhong Xue 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The stability issues of a multi-module distributed DC power system without current-sharing loop are analyzed in this study. The physical understanding of the terminal characteristics of each sub-module is focused on. All the modules are divided into two groups based on the different terminal property types, namely, impedance (Z) and admittance (Y) types. The equivalent circuits of each group are established to analyze the stability issues, and the mathematical equations of the equivalent circuits are derived. A generalized criterion for multi-module distributed systems is proposed based on the stability criterion in a cascade system. The proposed criterion is independent of the power flow direction.
Study on the performance of different discharging devices of a continuous production system
Zhenya Duan,Jie Wang,Shujie Sun,Wenchen Li,Haodong Zhang,Guoyue Qiao,Junmei Zhang,Jingtao Wang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Based on the developed continuous production system of sodium phenol carboxylation reaction, severaltypes of discharging devices are proposed, which are suitable for the case where the transported particles are not easyto maintain a stable state in the transported fluid. Numerical simulations of the gas-solid two-phase flow characteristicsand particle distribution were performed with DPM, and the particle retention ratio and fluid loss degree were proposedto investigate the performance of the discharging devices. The results of simulations and industrial experimentsshowed that a guide plate installed in the “B” discharging device can solve the accumulation problem, realize the efficientand continuous delivery of the particles, and maintain a uniform distribution of particles. This study can providea reference for the design of a gas-solid two-phase discharging device, and guide the industrial experimental operationand modification of continuous production systems for sodium phenol carboxylation.
Dissimilar Resistance Spot Welding of DP 600/A5052/DP 600 Triple Sheets
Ting Li,Xinjian Yuan,Zhan Hu,Kanglong Wu,Haodong Wang,Bangqiang Zhang 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11
Triple sheets of DP 600/A5052 aluminum alloy/DP 600 steel were joined by means of resistance spot welding in this study. The experimental results showed that the microstructure of fusion zone was lath martensite for DP 600 and column crystals for A5052. Their grains coarsened with increasing distance away from the base metals. The interface zone between DP 600 and A5052 was composed of continuous Fe2Al5 intermetallic compound (IMC) layer and needle-like Fe4Al13 IMC. When welding time prolonged from 8 cycles to 17 cycles, the average length of Fe4Al13 phase adjacent to A5052 shortened from 2.3 μm to 0.89 μm, whereas the thickness of Fe2Al5 IMC layer near DP 600 widened from 1.59 μm to 2.59 μm. The tensile-shear load of DP 600/A5052/DP 600 joints reached a maximum value of 10.796 kN with 14 cycles welding time. Failure during tensile-shear testing occurred along DP 600/A5052 interfaces because Fe2Al5 and Fe4Al13 were brittle phases, but an amount of tearing area was found on the fracture surface.
Efficiently visible and 2 μm infrared emission in K2YbF5: Ce3+/Ho3+ microcrystals
Hao Dong,Guangping Zhu,Min Zhang,Kai Dai,Qiang Li,Chaopeng Cui 한국물리학회 2020 Current Applied Physics Vol.20 No.6
Ho3+/Ce3+ co-doped K2YbF5 microcrystals were synthesized by solvent-thermal method. Under excitation of 980 nm laser diode, effectively visible and 2 μm-infrared luminescence of Ho3+ ion were obtained in the microcrystals. By changing Ce3+-ion doping concentration, the luminescence properties of visible and 2 μm emission were effectively regulated. At low Ce3+-ion doping level, the red and green upconversion emission obviously increases and decreases respectively with the increase of Ce3+-ion amount in the samples, meanwhile the intensity of 2 μm fluorescence changes very little. At high Ce3+-ion doping level, the intensities of the red and green emission both decrease with the increase of Ce3+-ion concentration, while the 2 μm emission intensity increases obviously. In the sample doped with 16% Ce3+ ion, the intensity of 2 μm emission is about 4.5 times that of the sample without Ce3+ ion, and the corresponding quantum efficiency is about 78.3%. The result is attributed to the influence of the different cross relaxation between Ho3+ and Ce3+ ion in luminescence process at low and high Ce3+-ion doping concentration. The corresponding luminescence mechanism and energy transfer process were discussed in detail.