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The Performance of Small Diameter Aluminum Light Support Structures containing Handholes under cyclic Fatigue

Open Journal of civil Engineering 2024年第2期14卷 196-213页

作者： cameron r. rusnak Aya Al-Hamami craig c. Menzemer Department of Science Technology and Mathematics Lincoln University of Missouri Jefferson Missouri USA Auburn Science and Engineering center Department of Civil Engineering The University of Akron Akron Ohio USA

Aluminum light poles play a pivotal role in modern infrastructure, ensuring proper illumination along highways and in populated areas during nighttime. These poles typically feature handholes near their bases, providing access to electrical wiring for installation and maintenance. While essential for functionality, these handholes introduce a vulnerability to the overall structure, making them a potential failure point. Although prior research and analyses on aluminum light poles have been conducted, the behavior of smaller diameter poles containing handholes remains unexplored. recognizing this need, a research team at the University of Akron undertook a comprehensive experimental program involving aluminum light poles with handholes containing welded inserts in order to gain a better understanding of their fatigue life, mechanical behavior, and failure mechanisms. The research involved testing seven large-scale aluminum light poles each 8-inch diameter, with two separate handholes. These handholes included a reinforcement that was welded to the poles. Finite Element Analysis (fea), statistical analysis, and comparison analysis with their large counterparts (10-inch diameter) were used to augment the experimental results. The results revealed two distinct failure modes: progressive crack propagation leading to ultimate failure, and rupture of the pole near the weld initiation/termination site around the handhole. The comparison analysis indicated that the 8-inch diameter specimens exhibited an average fatigue life exceeding that of their 10-inch counterparts by an average of 30.7%. The experimental results were plotted alongside the fatigue detail classifications outlined in the Aluminum Design Manual (ADM), enhancing understanding of the fatigue detail category of the respective poles/handholes.

关键词： Light Pole Handhole cyclic Fatigue Fatigue Analysis Finite Element Analysis Statistical Analysis

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Influence of Ti^(4+) doping on hyperfine field parameters of Mg_(0.95)Mn_(0.05)Fe_(2-2x)Ti_(2x)O_4(0≤x≤0.7)

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Journal of central South University 2010年第6期17卷 1139-1143页

作者： KUMAr S PrAKASH r ALIMUDDIN cHOI H K KOO B H SONG J I cHUNG H JEONG H LEE c G School of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Applied Physics Aligarh Muslim UniversityAligarh 202002India Department of Precision & Mechanical Engineering and BK21 Eco-Friendly Heat & cooling Energy Mechanical research Team Gyeongsang National U niversityTongyeong 650160Korea

The mixed spinel ferrite system Mg0.95Mn0.05Fe2-2xTizxO4 （0 ≤x ≤ 0.7） was synthesized by the conventional solid-state reaction technique. The effect of Ti^4＋ doping was studied by using the Moessbauer spectroscopy measurements at room temperature. From the analysis of the Moessbauer spectra, it is observed that s-electron density, electric field gradient （EFG）, quadrupole coupling constant （Qcc） and the net hyperfine magnetic fields acting on the Moessbauer nuclei-fea^3＋ and FeB^3＋ change with the increase of Ti^4＋ doping in Mg0.95Mn0.05Fe2O4. The hyperfine magnetic field decreases with the increase of Ti^4＋ doping.

关键词： spinel ferrite Moessbauer spectroscopy hyperfine magnetic field isomer shift Ti^4+ doping

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Fracture Mechanics and Its Application in the Fatigue Behavior of reinforced Welded Hand-Holes in Aluminum Light Poles

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Open Journal of civil Engineering 2023年第4期13卷 677-694页

作者： cameron r. rusnak craig c. Menzemer Earthquake Engineering Laboratory Department of Civil and Environmental Engineering University of Nevada Reno Nevada USA Auburn Science and Engineering center Department of Civil Engineering The University of Akron Akron Ohio USA

Predicting fatigue life of a given specimen using analytical methods can sometimes be challenging. An approach worth considering for this prediction involves employing fracture mechanics. Fracture mechanics can complement both laboratory experiments and finite element analysis (fea) in estimating fatigue life of a given specimen, if relevant. In the case of aluminum light poles containing a welded hand-hole, the fatigue life has not yet been thoroughly predicted. The University of Akron has conducted a comprehensive fatigue study on aluminum light poles through various means, albeit without of predicting of said fatigue life of the specimens. AFGrOW (Air Force Growth) can be used as a fracture mechanics software to predict fatigue life. ABAQUS was used (for fea) in conjunction with the AFGrOW analysis. The purpose of this study was to ultimately predict the life of the specimens tested in the lab and was achieved with various models including hollow tube and plate models. The plate model process was ultimately found to be the best method for this prediction, yielding results that mimicked the data from the laboratory. Further application for this form of fracture mechanics analysis is still yet to be determined, but for the sake of aluminum light poles, it is possible to predict the fatigue life and utilize said prediction in the field.

关键词： Fracture Mechanics Finite Element Analysis AFGrOW Fatigue Analysis Structural Analysis

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An Adaptive Load Stepping Algorithm for Path-Dependent Problems Based on Estimated convergence rates

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computer Modeling in Engineering & Sciences 2017年第3期113卷 325-342页

作者： M.T.c.Araújo Fernandes c.O.cardoso W.J.Mansur civil Engineering Department/cOPPE/Federal University of rio de Janeiro Ilha do FundaoP.B.6850621945-970 Rio de JaneiroRJBrazil Petrobras/cenpes Av.Horácio Macedo950Ilha do Fundao21941-915 Rio de JaneiroRJBrazil civil Engineering Department/cOPPE/Federal University of rio de Janeiro Ilha do FundaoP.B.6850621945-970 Rio de JaneiroRJBrazil

A new adaptive(automatic)time stepping algorithm,called rcA(rate of convergence Algorithm)is *** new algorithm was applied in nonlinear finite element analysis of path-dependent *** step size is adjusted by monitoring the estimated convergence rate of the nonlinear iterative *** rcA algorithm is relatively simple to implement,robust and its performance is comparable to,and in some cases better than,the automatic load incrementaion algorithm existent in commercial *** about the convergence rate of nonlinear iterative processes,an estimation of the rate and a study of the parameters of the rcA algorithm are *** show the capacity of the algorithm to adjust the increment size,detailed discussions based on results for different limit load analyses are *** results obtained by rcA algorithm are compared with those by ABAQUS?,one of the most powerful nonlinear fea(Finite Element Analysis)commercial software,in order to verify the capability of rcA algorithm to adjust the increment size along nonlinear analyses.

关键词： rate of convergence nonlinear automatic load incrementation limit load

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rELIABILITY ANALYSIS FOr AN AErO ENGINE TUrBINE DISK UNDEr LOW cYcLE FATIGUE cONDITION

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 514-520页

作者： c.L.Liu Z.Z.Lü Y.L.Xu School of Aviation Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Aviation Northwestern Polytechnical University Xi'an 710072 ChinaChina Aviation Research Institute 608 Zhuzhou 412002 China

reliability analysis methods based on the linear damage accumulation law (LDAL) and load-life interference model are studied in this paper. According to the equal probability rule, the equivalent loads are derived, and the reliability analysis method based on load-life interference model and recurrence formula is constructed. In conjunction with finite element analysis (fea) program, the reliability of an aero engine turbine disk under low cycle fatigue (LcF) condition has been analyzed. The results show the turbine disk is safety and the above reliability analysis methods are feasible.

关键词： low cycle fatigue life reliability analysis load-life interference model recurrence method aero engine turbine disk

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Friction anisotropy dependence on lattice orientation of graphene

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Science china(Physics,Mechanics & Astronomy) 2014年第4期57卷 663-667页

作者： ZHANG Yu LIU LianQing XI Ning WANG Yuechao DONG ZaiLi WEJINYA Uchechukwu c State Key Laboratory of robotics Shenyang Institute of Automation Chinese Academy of Sciences University of chinese Academy of Sciences Department of Mechanical and Biomedical Engineering City University of HongKong Department of Mechanical Engineering University of ArkansasFayetteville Arkansas 72701 USA

The observation of friction anisotropy on graphene by friction measurement at atomic scale has been reported in this ***-scale friction measurement revealed friction anisotropy with a periodicity of 60°,which is consistent with the hexagonal periodicity of the *** experiments and theory show that the value of the friction force is related to the graphene lattice orientation,and the friction force along armchair orientation is also larger than the one along zigzag *** results will play a critical role in the use of graphene to manufacture nanoscale devices.

关键词： graphene friction anisotropic lattice orientation

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Mobile augmented reality visualization and collaboration techniques for on-site finite element structural analysis

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International Journal of Modeling, Simulation, and Scientific computing 2018年第3期9卷 2-21页

作者： W.K.Li A.Y.c.Nee S.K.Ong NUS Graduate School for Integrative Sciences and Engineering National University of Singapore 28 Medical Drive Singapore 117456Singapore Mechanical Engineering Department National University of Singapore 9 Engineering Drive 1 Singapore 117576Singapore∗mpeneeyc@nus.edu.sg

In this paper,a mobile augmented reality(Ar)framework for on-site finite element analysis(fea)is *** proposed framework is achieved using a client–server *** performance of fea relies on several important components,namely,computational power,visualization technique,and numerical *** renders intuitive computer-generated contents directly on a user’s *** fea with Ar helps users through enhancing their perception and interaction with the engineering *** and effective visualization of these data using an Ar platform can reduce the misinterpretation in spatial and logical *** the past decade,Ar has undergone a transition from desktop to phablet *** platforms enable user exploration of fea results in *** client side uses a hybrid method to visualize fea results in the mobile Ar *** addition,a user can collaborate with other users by using the result sharing function.A prototype with basic functions has been built and a case study has been implemented to demonstrate the visualization method and evaluate the overall performance.

关键词： Augmented reality scientific visualization on-site finite element analysis client-server.

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美国大豆工业海洋网箱水产养殖技术近海海水鱼类养殖网箱工程技术手册(十五)

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中国水产 2010年第11期 85-86页

作者： Michael c.cremer H.r.Schmittou Hsiang Pin Lan Jesse chappell

（上接2010年第10期）4.原型网箱系统的开发（1）网箱和锚定系统利用OcAT鱼类养殖箱的设计的参数,开发了网箱和锚定系统的fea原型。用在Aqua-FE中各设计部分的参数分配如表1中所示。建造原型网箱包括捆扎件,

关键词：养殖网箱海水鱼类水产养殖技术技术手册美国大豆十五工程近海

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cFrP与钢组合拉索斜拉桥经济性能分析

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哈尔滨工业大学学报 2011年第8期43卷 124-129页

作者：熊文孙斌肖汝诚 c.S.cAI 东南大学交通学院桥梁工程系南京210096 同济大学桥梁工程系上海200092 路易斯安那州立大学土木与环境工程系美国巴吞鲁日70803

为克服大跨径斜拉桥整体刚度降低,提出一种新型斜拉桥方案,即cFrP与钢组合拉索斜拉桥,介绍碳纤维增强塑料cFrP与钢组合拉索斜拉桥的设计理念,并提出斜拉索构造以及斜拉桥结构的设计方法,研究了cFrP与钢组合拉索斜拉桥经济性能,并推导出... 详细信息

为克服大跨径斜拉桥整体刚度降低,提出一种新型斜拉桥方案,即cFrP与钢组合拉索斜拉桥,介绍碳纤维增强塑料cFrP与钢组合拉索斜拉桥的设计理念,并提出斜拉索构造以及斜拉桥结构的设计方法,研究了cFrP与钢组合拉索斜拉桥经济性能,并推导出该类斜拉桥的材料用量与造价公式.基于所推导公式,对其跨长、塔高以及价格比分别进行经济性能参数分析,得到cFrP与钢组合拉索斜拉桥的经济性能变化规律,为该类斜拉桥设计提供理论依据,从理论上证明cFrP与钢组合拉索斜拉桥的经济性能优势和未来替代传统斜拉索应用在斜拉桥上的可行性.

关键词：斜拉桥组合拉索 cFrP斜拉索经济性能造价公式参数分析

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Experimental and numerical analysis on suitability of S-Glass-carbon fiber reinforced polymer composites for submarine hull

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Defence Technology（防务技术） 2023年第1期19卷 1-11页

作者： Elango Natarajan Lídio Inacio Freitas M.S.Santhosh Kalaimani Markandan Ammar Abdulaziz Majeed Al-Talib c.S.Hassan Faculty of Engineering Technology and Built EnvironmentUCSI UniversityKuala LumpurMalaysia Dili Institute of Technology DiliTimor-Leste Selvam composite Materials research Laboratory Department of Mechanical EngineeringSelvam College of TechnologyTamil NaduIndia

Suitability of S-Glass/carbon fiber reinforced polymer composite for submarine hull subjected to hydrostatic pressure has been investigated in the present *** materials have raised concerns owing to their decomposition due to low resistance towards salinity and hence polymer composites have been explored to showcase their mechanical stability to withstand transverse and impact *** this end,the mechanical properties of S-Glass/carbon fiber reinforced polymer composite were experimentally investigated and higher specific strength and stiffness of the composite in comparison to many metallic materials used for submarine hull were *** obtained experimental values were used for the static and dynamic crash analysis of the bow,stern and foil through Finite Element Analysis(fea);where depth of travel was varied from sea surface level of 0-7000 *** assembly was later developed with the optimum shape and thickness of each *** also report the nonlinear crash analysis upon impact at velocity ranging from 3 to 21 m/***,kinetic energy,acceleration peak and internal energy in struck submarine revealed that travel depth 1750 m and 3500 m is recommendable,more particularly,crash safety factor of the submarine is found to be within limit when submarine encounters crash at 1750 m.

关键词： crash Impact Design Submarine Hull Bow Stern Foil

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