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The Coupled Effect of Temperature Changes and damage depth on Natural Frequencies in Beam-Like Structures

Structural Durability & Health Monitoring 2022年第1期16卷 15-35页

作者： Tareq Al-hababi Nizar Faisal Alkayem Li Cui Shixiang Zhang Cong Liu Maosen Cao Anhui Provincial International Joint Research Center of Data Diagnosis and Smart Maintenance on Bridge Structures Chuzhou UniversityChuzhou239000China Department of Engineering Mechanics Hohai UniversityNanjing210098China College of Civil and Transportation Engineering Hohai University Nanjing210098China College of Civil and Architecture Engineering Chuzhou UniversityChuzhou239000China China Design Group Co. Ltd.Nanjing210014China Jiangsu Zhongqiao Technology Research Co. Ltd.Nantong226000China

A significant amount of research is concerned with dynamic modal parameters for damage detection of structural conditions due to their simplicity in use and ***,their use for damage detection should be performed with special attention,particularly in operational and environmental conditions subjected to temperature *** in construction industries experience different loading types,such as temperature changes leading to crack initiation and *** physical and dynamic properties such as natural frequencies and mode shapes indicate that damage has occurred within the *** this study,vibration analysis of cantilever and cantilever simply supported beams has been carried out on intact and damaged beams to investigate the coupled effect of temperature changes and damage depth on natural frequencies.A numerical analysis of beams is completed using ANSYS *** results of numerical simulation are validated using two other studies from *** results revealed that in order to perform a successful damage assessment using the frequency shift,the vibration modes should be selected *** addition,an increase in temperature results in a decrease in structural *** assessment of the effect of damage depth on natural frequencies also confirms that when damage depth is increased,there is a significant decrease in natural frequency responses.

关键词： Temperature effect damage depth natural frequency beam damage detection modal analysis

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An improved model of damage depth of shock-melted metal in microspall under triangular wave loading

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Chinese Physics B 2021年第9期30卷 412-418页

作者： Wen-Bin Liu An-Min He Kun Wang Jian-Ting Xin Jian-Li Shao Nan-Sheng Liu Pei Wang Department of Modern Mechanics University of Science and Technology of ChinaHefei 230027China Institute of Applied Physics and Computational Mathematics Beijing 100094China Graduate School of China Academy of Engineering Physics Beijing 100088China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Science and Technology on Plasma Physics Laboratory Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Center for Applied Physics and Technology Peking UniversityBeijing 100871China

damage depth is an important dynamic parameter for describing the degree of material damage and is also a key fundamental issue in the field of impact compression *** present work is dedicated to the damage depth of shock-melted metal in microspall under triangular wave loading,and an improved model of damage depth considering the material's compressibility and relative movement is *** damage depth obtained from the proposed model is in good agreement with the laser-driven shock loading *** with the previous model,the proposed model can predict the damage depth of shock-melted metal in microspall more ***,two-groups of the smoothed particle hydrodynamics(SPH)simulations are carried out to investigate the effects of peak stress and decay length of the incident triangular wave on the damage depth,*** the decay length increases,the damage depth increases *** the peak stress increases,the damage depth increases nonlinearly,and the increase in damage depth gradually slows *** results of the SPH simulations adequately reproduce the results of the proposed model in terms of the damage ***,it is found that the threshold stress criterion can reflect the macroscopic characteristics of microspall of melted metal.

关键词： damage depth theoretical modeling microspall triangular wave

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Monte Carlo Si mulation of damage depth in Focused Ion Beam Milling Si_3N_4 Thin Film

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Semiconductor Photonics and Technology 2007年第4期13卷 272-275,288页

作者： TAN Yong-wen XIE Xue-bing Jack Zhou XU Tian-wei YANG Wei-guo YANG Hai Department of Physics Yunnan Normal University Kunming 650092 CHN Department of Mechanical Engineering and Mechanics Drexel University Phiadelphia PA 19104 USA Department of Computer Yunnan Normal University Kunming 650092 CHN

The damage properties of Focused Ion Beam(FIB) milling Si3N4 thin film are investigated by the detailed analyzing images of nanoholes and simulation of Monte Carlo. The damage depth in the Si3N4 thin film for two different ion species(Gallium and Arsenic) under various parameters(ion energy, angle of incidence) are investigated by Monte Carlo method. The simulations show the damage depth increases with the increasing ion energy, the damage depth is dependent on the angle of incident ion, the curves of the damage depth for Ga ion and As ion at 30 keV nearly superpose, while the damage depth for Ga with 90 keV ion is more than that for As ion with the same energy.

关键词： monte carlo method focused ion beam effects damage depth

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