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Mode I Fracture Analysis of Adhesively Bonded Bi-Material Dcb Joints

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SSRN 2023年

作者： Wang, Wandong Zhang, Shijie Chen, Guiyong Zhu, Yangxuan Zhao, Tian School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi’an710072 China Co. Ltd 610000 China Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics School of Science Wuhan University of Technology Wuhan430070 China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Institute of Advanced Structure Technology Beijing Institute of Technology Beijing100081 China

There has been a disputation about how to design bi-material double cantilever beam (DCB) joints to measure pure mode I fracture toughness. This paper develops a theoretical frame to calculate the stresses in the adhesive layer and perform the data reduction and mode partitioning for generic bi-material DCB specimens. The theoretical model was validated using experimental data and conventional finite element method. The prediction results substantiate that the strain-based design strategy leads to a pure mode I fracture of the bi-material DCB joints. The proposed theoretical method can promote the application of strain-based criterion for designing the adhesively bonded bi-material DCB joints to appropriately obtain the pure mode I critical fracture toughness. © 2023, The Authors. All rights reserved.

关键词： Adhesives

Numerical Fracture Analysis of a Reactor Pressure Vessel based on Abaqus-FRANC3D Co-simulation Method

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Procedia Structural Integrity 2022年 37卷 225-232页

作者： M. Annor-Nyarko Hong Xia Key Laboratory of Nuclear Safety and Advanced Nuclear Energy Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin 150001 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Nuclear Installations Directorate Nuclear Regulatory Authority Ghana

The reactor pressure vessel (RPV) is subjected to many cyclic loadings critical of which is the integrity risk posed by pressurized thermal shock (PTS) loadings induced by one of the most frequent anticipated operational occurrences - inadvertent operation of the safety injection system (SIS). In this paper, the fracture mechanics analysis for an ageing pressurized water reactor subjected to PTS induced by inadvertent actuation of the SIS is performed using a proposed simplified Abaqus-FRANC3D co-simulation method. A three-dimensional (3-D) finite element half-symmetric model of a typical pressured water reactor RPV is used to perform thermal-mechanical stress coupling analysis. 3-D fracture mechanic submodel with an assumed surface crack is created for the computation of the transient integrity parameter-stress intensity factor (SIF), using M-integral approach coupled in the proposed co-simulation method. Subsequently ASME method is used to evaluate the vessel’s material fracture toughness. Finally, the SIFs obtained with the simplified co-simulation method is compared with the conventional virtual crack-closure technique (VCCT), and the result show good agreement. This work serves as a useful reference for fast crack propagation and life prediction analysis of ageing PWR RPVs.

关键词： Pressurized thermal shock Fracture mechanics Reactor pressure vessel Safety injection system Stress intensity factor FRANC3D

Corrigendum to ‘Correlating multi-scale structure characteristics to mechanical behavior of Caprinae horn sheaths’

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Journal of Materials Research and technology 2023年 24卷 10056-10057页

作者： Kang Yang Nannan Qin Haiyun Yu Changgeng Zhou Hailiang Deng Wenhan Tian Siyu Cai Zihong Wu Juan Guan Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology) Ministry of Education Maanshan 243002 China School of Materials Science and Engineering Anhui University of Technology Maanshan 243002 China State Key Laboratory of Molecular Engineering of Polymers (Fudan University) Shanghai 200433 China Composite Component Technology Center Aviation Industry Corporation of China (AVIC) Composite Corporation Ltd Beijing 101300 China International Research Center for Advanced Structural and Biomaterials School of Materials Science and Engineering Beihang University Beijing 100191 China Guiyang Engine Research Institute of Aviation Industry Corporation of China(AVIC) Guiyang 550081 China

Thermal Management of Turbine Disc Cavity System Using Ffbpnn and Nsga Ii Algorithm

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SSRN 2024年

作者： He, Zhenzong Zuo, Min Liang, Shuang Mao, Junkui College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Collaborative Innovation Center for Advanced Aero-Engine Beijing100191 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing211106 China

This study addresses the thermal management of the turbine disc cavity system (TDCS) by combining the feed-forward backward propagation neural network (FFBPNN) with the non-dominated sorting genetic algorithm II (NSGA II). First, the heat transfer analysis of the TDCS is carried out using the 1D fluid network method and the 2D finite element method. The impact of different cooling air inlet conditions on the heat transfer performance of the TDCS is investigated. The results show that changing the inlet pressure and temperature significantly affects the heat transfer performance of the TDCS, and the TDCS temperature field can be regulated by the inlet parameters. Then, the prediction model based on the FFBPNN is established to predict the heat transfer performance of the TDCS, and satisfactory result is obtained with mean relative error lower than 1.5% and a coefficient of determination higher than 0.998. Finally, the NSGA II is employed to optimize the cool air inlet condition to achieve thermal management of the TDCS. The Pareto solution set and the optimal solution are obtained. The results indicate that the most comprehensive improvement in the heat transfer performance of the TDCS can be achieved by the present technology. © 2024, The Authors. All rights reserved.

关键词： Temperature control

Investigation of Transport Models of Radionuclides in Various Water Environments 29

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Investigation of Transport Models of Radionuclides in Variou...

2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Qu, Zhengzhe Nie, Baojie Wang, Liang Xie, Feng Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing100084 China College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing211106 China School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment Beijing100082 China State Environ. Protect. Key Lab. of Nucl. and Radiation Safety Regulatory Simulation and Validation Beijing100082 China

ISBN: (纸本)9780791886502

Concerning the Fukushima nuclear accident, many radionuclides were released into the marine environment, which caused contamination of many parts of the world through ocean circulation. Regarding inland nuclear power plants, freshwater habitats such as reservoirs and rivers could also be polluted by the radioactive effluents. Several models were developed to track radionuclide transport in the water environment. However, the applicability and characteristics of these models were not fully identified and compared, particularly for the different water environments. In this study, the research progress and application examples of radionuclide transport models in rivers and oceans in recent years are systematically summarized, and the methods for simulating radionuclide transport behavior in various water environments are compared. An adequate model is expected to be instrumental in assessing radioactive pollution in various water environments. © 2022 by ASME.

关键词： Radioisotopes

First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

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arXiv

arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

Crack-based and Hair-like Sensors Inspired from Arthropods:A Review

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Journal of Bionic Engineering 2020年第5期17卷 867-898页

作者： Changchao Zhang Junqiu Zhang Daobing Chen Xiancun Meng Linpeng Liu Kejun Wang Zhibin Jiao Tao Sun Dakai Wang Shichao Niu Zhiwu Han Luquan Ren Key Laboratory of Bionic Engineering(Ministry of Education China)Jilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical and Electric Engineering Jiangsu Provincial Key Laboratory of Advanced RoboticsSoochow UniversitySuzhou 215123China

Over a long period of time,arthropods evolve to have two excellent mechanical sensilla of slit sensilla and trichobothria sensilla,which construct a perfect perception *** former mainly perceives the change of the in-the-plane force while the latter perceives that of the out-of-plane *** recent years,these two sensilla have attracted researchers as the models for developing artificial mechanical *** review mainly includes the biomechanics and biomimetic manufacturing techniques as well as their future application *** order to better understand the advantages of biological strategies,this review describes the morphology,mechanical analysis,and information recognition of slit sensilla and trichobothria *** this review highlights the recent development of Crack-based Sensors(CBSs)and Hair-like Sensors(HLSs)based on the analysis of biological *** manufacturing method and substrate of crack in CBS and those of hair rods in HLS are discussed ***,the practical applications and potential value of two sensilla,such as flexible wearable electronic devices,robot sensing system,autopilot sensing and wind tunnel speed detection,are briefly discussed.

关键词： crack-based sensors hair-like sensors slit sensilla trichobothria sensilla bioinspiration

A Successive "Conversion-Deposition" Mechanism Achieved by Micro-Crystalline Cu2O Modified Current Collector for Composite Lithium Anode

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SSRN 2022年

作者： Cai, Yifei Qin, Bin Li, Chun Si, Xiaoqing Cao, Jian Zheng, Xiaohang Qiao, Liang Qi, Junlei State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China

Lithium (Li) metal is a promising material for high-energy-density batteries, but it is still plagued by obvious capacity degradation and low average Coulombic efficiency resulting from dendrite Li propagation. One main reason is the electro-mechanic coupled failure of plated Li on the current collector, which contributes to non-dense Li deposition on the anode. Transition metal oxides (TMOs) with a conversion-type mechanism have been used directly as the anode materials for lithium ion batteries, which demonstrated better electro-mechanical stability than metal Li. Herein, a successive ''conversion-deposition'' mechanism is ingeniously developed to restrain the generation of dendritic Li. Specifically, a micro-crystalline Cu2O modified current collector was prepared, in which Li+ are sequentially inserted into Cu2O and deposited in the form of Li metal at successive low potential. A Li-Cu half-cell based on the hybrid mechanism sustains a high Coulombic efficiency of over 99.3% in up to 800 cycles. This work ingeniously inhibits the generation of dendrite Li by incorporating conversion-type materials with deposition-dissolution type metal Li, which contributes to a novel concept for the design of functional current collectors for composite Li anodes. © 2022, The Authors. All rights reserved.

关键词： Copper oxides

Effect of Overlap Pattern on the Residual Stress, Surface Morphology and Fatigue Properties of Ti-6al-4v Alloy by Multiple Laser Shock Peening

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SSRN 2024年

作者： Luo, Xuekun Tian, Kai Xu, Ziheng Wang, Yiming Wang, Xin Wang, Kun Yu, Yang Guo, Lulu Ye, Chang Dang, Ning Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials Beijing Institute of Aeronautical Material Beijing100095 China School of Mechanical Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Shenyang Engine Research Institute Shenyang110000 China State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research Institute Shaanxi Xi’an710077 China

In this study, the effects of the laser shock peening (LSP) pattern on the fatigue properties of Ti-6Al-4V alloy were investigated. The residual stress distribution and surface morphology generated by LSP were analyzed using both experiments and numerical simulations. The results show that by optimizing the LSP patterns and overlap ratios, deep compressive residual stresses and beneficial surface morphology can be obtained, resulting in a significant improvement of the fatigue performance. Specifically, LSP without optimization improves the fatigue life by a factor of 1.68 when the stress level is 550 MPa and the stress ratio is 0.1, while LSP with optimized parameters improves the fatigue life by a factor of 29.67. It has been demonstrated that the optimization of LSP patterns and overlap ratios plays an important role in enhancing the surface integrity and, thus, the fatigue performance of the Ti-6Al-4V alloy. © 2024, The Authors. All rights reserved.

关键词： Surface morphology