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Academic literature on the topic 'Thin-walled element of detail'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Thin-walled element of detail"

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Erkmen, R. Emre, and Magdi Mohareb. "Nonorthogonal solution for thin-walled members – applications and modelling considerations." Canadian Journal of Civil Engineering 33, no. 4 (April 1, 2006): 440–50. http://dx.doi.org/10.1139/l06-027.

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In a companion paper (R.E. Erkmen and M. Mohareb. 2006. Canadian Journal of Civil Engineering, 33: 421–439.), three finite elements based on the Vlasov thin-walled beam theory were formulated using a nonorthogonal coordinate system. Although the associated derivations are more elaborate than in more conventional solutions based on orthogonal coordinates, the new elements offer more modelling capabilities and flexibility in modelling structural steel members, a feature that is illustrated in this paper. In this context, the current paper presents four details in steel construction that were conveniently modelled within the new solution scheme. The applications involve thin-walled members with coped flanges, rectangular holes reinforced with longitudinal stiffeners, and eccentric supports. Comparisons with established shell finite element models using ABAQUS suggest the validity of the new solution. Key words: open sections, finite element analysis, thin-walled members, coped flanges, rectangular holes, eccentric supports.
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Rosmanit, Miroslav, Přemysl Pařenica, Oldřich Sucharda, and Petr Lehner. "Physical Tests of Alternative Connections of Different High Roof Purlins Regarding Upward Loading." Buildings 11, no. 11 (October 29, 2021): 512. http://dx.doi.org/10.3390/buildings11110512.

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Thin-walled cold-rolled sections are used in the construction industry, especially in the roofing of large-span halls. The load-bearing capacity of a thin-walled structure depends to a large extent on the load-bearing capacity of the details at the point of attachment to the structure and the interconnection of the individual thin-walled elements. Therefore, in the case of thin-walled structures, it is necessary to use additional structural elements such as local reinforcement, stabilising elements, supports, and other structural measures such as the doubling of profiles. This paper focused on the behaviour of tall Z300 and Z350 mm thin-walled trusses at the connection to the superstructure regarding upward loading (e.g., wind suction and so on). Two section thicknesses, 1.89 mm and 2.85 mm, were experimentally analysed. Furthermore, two types of connections were prepared, more precisely without and with a reinforced buckle. The experiments aimed to investigate the behaviour and load-carrying capacity of the detail of the roof truss connections to the supporting structure. The resulting load capacity values were compared with normative approaches. Analyses of the details of the bolt in the connection are also presented. The paper presents a practical evaluation of the physical test on real structural members.
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Wang, J., D. Qin, and Q. Zhang. "Mathematical model for predicting the blade behaviour of horizontal axis wind turbine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 9 (September 1, 2008): 1681–94. http://dx.doi.org/10.1243/09544062jmes733.

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A mathematical model using both beam finite element and thin-walled structure theory is developed to predict the natural frequency and blade behaviour of a horizontal axis wind turbine under constant wind speed and turbulence condition. First of all, the deformation pattern of the blade is defined on the basis of thin-walled structure theory and Timoshenko beam theory, and by considering the blade as a rotation cantilever beam, the governing equation is obtained using the principle of virtual work. Then, it is discreted by a beam element. Constraints are applied to define boundary conditions and coupling of flapwise, edgewise, and elongation deformations on the governing equation using the penalty method. Finally, natural frequencies of the blade are analysed. Detailed expressions for centrifugal and Coriolis forces are obtained. The stress on the root and displacement at the tip are also analysed in detail. The blade's deflection in turbulent conditions is simulated and shown to mostly influence flapwise blade deformation.
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Sha, Yun Dong, Ji Yong Li, and Zhi Jun Gao. "Dynamic Response of Pre/Post Buckled Thin-Walled Structure under Thermo-Acoustic Loading." Applied Mechanics and Materials 80-81 (July 2011): 536–41. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.536.

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Advanced aircraft and spacecraft structures are exposed to increasingly severe operating environments, including a combination of mechanical, aerodynamic, acoustic and thermal loads. Such loading conditions can cause thin-walled structures to respond in a nonlinear fashion and exhibit complex response characteristics. This paper investigates the dynamic response of pre/post buckled thin-walled structure under high level random acoustic loading. Firstly, different orders of critical buckling temperatures and modal frequencies under alternative temperatures are obtained using Finite Element Method (FEM), and the modal frequency changes in a disorder fashion are discussed in detail. Then with coupled BEM/FEM method, the dynamic responses including transverse displacement, strain and stress of a stiffened rectangular plate under thermo-acoustic loading are simulated. By comparing the response characteristics of the plate in pre/post buckled conditions, some valuable conclusions are derived, which can be used to explain the response behaviours of thin-walled structures.
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Kang, Yong Gang, Zhong Qi Wang, J. J. Wu, and Cheng Yu Jiang. "Efficient Algorithms for Calculations of the Maximum Surface Form Errors in Peripheral Milling." Applied Mechanics and Materials 10-12 (December 2007): 757–61. http://dx.doi.org/10.4028/www.scientific.net/amm.10-12.757.

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An efficient flexible iterative algorithm with a general approach is presented for calculations of surface form errors in peripheral milling of thin-walled workpiece. An efficient finite-element model for tool/workpiece is presented to analyze the surface dimensional errors in peripheral milling of aerospace thin-walled workpieces. The efficient flexible iterative algorithm is proposed to calculate the deflections and the maximum surface form errors as contrasted with the rigid iterative algorithm used in the literatures. Meanwhile, some key techniques such as the finite-element modeling of the tool-workpiece system; the determinant algorithm to judge instantaneous immersion boundaries between a cutter element and the workpiece; iterative scheme for the calculations of tool-workpiece deflections considering the former convergence cutting position are developed and the method for calculating the position and magnitude of the maximum surface form errors are developed and presented in detail. The proposed approach is validated and proved to be efficient through comparing the obtained numerical results with the test results.
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Voronov, S. A., and I. A. Kiselev. "Dynamics of flexible detail milling." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 225, no. 4 (September 23, 2011): 299–309. http://dx.doi.org/10.1177/1464419311418735.

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The five-axis milling operations are commonly used in aerospace industry. For example, this operation is the base for the machining process of the turbine blade production. The milling operations of thin-walled structures cause the vibrations of the tool and the workpiece and this turn affect the quality of the workpiece surface. Modelling of the milling process is necessary to determine the proper cutting conditions for the required productivity and the surface quality. In this article, the geometry modelling algorithm for five-axis milling process is proposed. Dynamics of the machined surface is modelled using the finite-element method. The obtained results make possible to conclude about the stability of milling process and to calculate the efficient processing conditions at which the amplitude of the generated vibrations does not exceed the admissible level. The results of this research can be used while the milling process technologies are designed. Especially, it is significant for the machining of hard-to-machine materials and processing of heat-resistant alloys in space and aircraft industries.
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Bruschelli, L., and V. Latorrata. "The Influence of “Shell Behavior” on Load Distribution for Thin-Walled Conical Joints." Journal of Applied Mechanics 67, no. 2 (April 12, 1999): 298–306. http://dx.doi.org/10.1115/1.1304841.

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This article presents a new analytical method with a numerical solution to calculate load distribution in threaded connections. Our departure model was that suggested by D. G. Sopwith who has proposed the most recent and most tested theory. Our research consists in the introduction of conicity and, above all, in the development of the influence of boundary geometry (i.e. the nonthreaded section) on load distribution. Pipe joints are analyzed in special detail, supplying us with useful finite element method comparative results. [S0021-8936(00)02002-X]
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Pařenica, Přemysl, Petr Lehner, Jiří Brožovský, and Martin Krejsa. "Numerical Models of the Connection of Thin-Walled Z-Profile Roof Purlins." Materials 14, no. 21 (November 1, 2021): 6573. http://dx.doi.org/10.3390/ma14216573.

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High thin-walled purlins of Z cross-section are important elements in steel wide-span structures. Their behaviour is influenced by many variables that need to be examined for every specific case. Their practical design thus requires extended knowledge of their behaviour for the possible configurations and dimensions. Numerical analysis verified by experimental investigation can thus enrich such knowledge. Numerical models have the advantage of repeatability and the ability to offer parametric changes. The parametric study presented shows a detailed description of a finite element model of thin-walled cross-sectional roof purlins connected to other roof elements. Models include various approaches to modelling bolt connection. Two schemes of purlins, with and without cleats, are presented. The results of different approaches in numerical modelling are compared with the results of a physical test on a real structure. The article shows a significant agreement in the case of specific approaches and points out the differences with others. The results can be helpful in terms of how to approach the modelling of thin-walled structures and the effective approach to experimental preparation.
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Chen, Fuh Kuo, and Shin Gee Chen. "Press Forging of Thin-Walled AZ31 Magnesium-Alloy Components." Advanced Materials Research 189-193 (February 2011): 1401–5. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1401.

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The press forging of AZ31 magnesium-alloy sheets for producing thin-walled structural components used in the electronics industry was examined by both the finite element analysis and the experimental approach in the present study. The experimental results obtained from the compression tests and ring compression tests were employed in the finite element simulations to investigate the effects of process parameters, such as forming temperature, friction condition, embossment location, and sheet thickness on the formation of embossments in a press forging process. The finite element simulation results reveal that a cost-effective press forging process of AZ31 magnesium-alloy requires an optimum combination of the above parameters. The detailed examination of the effects of the process parameters on the formation of embossments made in the present study could provide a design guideline for a press forging process of AZ31 magnesium-alloy sheets.
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Yidris, Noorfaizal, J. Loughlan, Mohamed Thariq Hameed Sultan, and Azmin Shakrine Mohd Rafie. "Failure Mechanics of Uniformly Compressed Thin-Walled Box-Section Struts." Applied Mechanics and Materials 225 (November 2012): 172–77. http://dx.doi.org/10.4028/www.scientific.net/amm.225.172.

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It is well known that the structural performance of thin-walled compression members is subject to the effects of local buckling and material yielding. Due to these effects, the compressive carrying capability of short strut members can be significantly reduced. This paper employs finite element simulation to examine the post-buckled response of thin-walled box-sections that covers complete loading history of the compression struts from the onset of elastic local buckling through the nonlinear elastic and elasto-plastic post-buckling phases of behaviour up to final collapse and unloading. A detailed account of the growth and redistribution of stresses on the surfaces is given in the paper. The results from finite element simulations are shown to compare well with the analytical method of analysis.
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Dissertations / Theses on the topic "Thin-walled element of detail"

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Козлова, Елена Борисовна. "Подавление регенеративных автоколебаний при фрезеровании тонкостенного элемента детали концевыми цилиндрическими фрезами." Thesis, Запорожский национальный технический университет, 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/25652.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.03.01 – процессы механической обработки, станки и инструменты. Национальный технический университет "Харьковский политехнический институт", Харьков, 2016. Диссертационная работа посвящена выявлению основных закономерностей влияния косоугольности и разнонаклонности зубьев концевой цилиндрической фрезы на повышение ее виброустойчивости и качество обработанной поверхности при фрезеровании тонкостенного элемента детали. Показано, что при изучении динамики процессов резания необходимо учитывать не только силы резания, но и силы упругости, демпфирования и инерционные силы, а также собственные частоты колебаний как инструмента, так и обрабатываемой детали. Конструкция измерительного стенда и система оценивания результатов позволяют определять закон движения тонкостенного элемента детали под действием всех видов сил. Разработанная конструкция 4–зубой экспериментальной концевой цилиндрической фрезы с регулируемым углом наклона каждого зуба позволила определить влияние косоугольности и разнонаклонности зубьев на вибрационные процессы, возбуждаемые при фрезеровании. Проведены исследования по определению влияния цилиндрической и плоской ленточки на задней поверхности зуба на подавление регенеративных автоколебаний. Установлено, что плоская ленточка на задней поверхности оказывает существенное положительное влияние на снижение параметра размаха автоколебаний R2. Механизм подавления автоколебаний в данном случае связан с изменением условий трения между задней поверхностью зуба фрезы и поверхностью резания. В работе приведены результаты сравнительных исследований по одновременному влиянию на подавление автоколебаний применения фрез с разнонаклонными режущими зубьями, у которых на задней поверхности заточена плоская ленточка. Заточка ленточки на задней поверхности разнонаклонных зубьев позволяет дополнительно уменьшить размах автоколебаний. При высоких скоростях фрезерования, когда автоколебания вырождаются, применение фрез с разнонаклонными зубьями не эффективно.
The thesis for the degree of candidate of technical sciences, specialty 05.03.01 – machining processes, machines and tools. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is sanctified to the exposure of basic conformities to law of influence of oblique–angledness and differently inclined points of end–capping cylindrical milling cutter on the increase of her vibration stability and quality of a treat surface at milling of the thin–walled element of detail. Construction of measuring stand and system of evaluation of results, and also the worked out construction of experimental end–capping cylindrical milling cutter with the managed angle of slope of every tooth allowed to define influence of oblique–angledness and differently inclined points on the oscillation processes excited at milling. On results the conducted experiments qualificatory correlation is set forth distinguished speed zones of vibrations of the thin–walled element of detail. It is set that increase of angle of slope of cutting edge w from 30° to 45° promotes vibrofirmness of process of the cylindrical milling. The turn of axis of rotation of milling cutter positively influences on the regenerative oscillation damping and reduces the parameter Ra of rejection of profile of a treat surface. A flat ribbon on a back surface renders substantial influence on the decline of parameter of scope of self–excited oscillations R2. Sharpening of ribbon on the back surface of differently inclined points allows additionally to decrease the scope of self–excited oscillations. At high–speeds of milling, when self–excited oscillations degenerate, application of milling cutters with differently inclined points is not effective.
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Козлова, Олена Борисівна. "Пригнічення регенеративних автоколивань при фрезеруванні тонкостінного елемента деталі кінцевими циліндричними фрезами." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/25648.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.03.01 – процеси механічної обробки, верстати та інструменти. Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертаційну роботу присвячено виявленню основних закономірностей впливу косокутності і різнонахиленості зубів кінцевої циліндричної фрези на підвищення її вібростійкості і якість обробленої поверхні при фрезеруванні тонкостінного елемента деталі. Конструкція вимірювального стенду та система оцінювання результатів, а також розроблена конструкція 4–зубої експериментальної кінцевої циліндричної фрези з можливістю регулювання кута нахилу кожного зуба, дозволили визначити вплив косокутності і різнонахиленості зубів на вібраційні процеси, які збуджуються при фрезеруванні. За результатами проведених експериментів сформульовано визначальне співвідношення і виділені IV швидкісні зони коливань тонкостінного елемента деталі. Встановлено, що кут нахилу ріжучої кромки w від 30° до 45° найбільше підвищує вібростійкість процесу циліндричного фрезерування. Поворот осі обертання фрези позитивно впливає на демпфування регенеративних втоколивань і знижує параметр Ra відхилення профілю обробленої поверхні. Експериментально підтверджено, що максимальний ефект від різнонахиленості сусідніх зубів досягається при невеликих кутах Dw від 3° до 6° в умовах порушення регенеративних автоколивань. Плоска стрічка на задній поверхні має суттєвий позитивний вплив на зниження параметра розмаху автоколивань R2. Заточування стрічки на задній поверхні різнонахилених зубів дозволяє додатково зменшити розмах автоколивань. При високих швидкостях фрезерування, коли автоколивання вироджуються, застосування фрез з різнонахиленими зубами неефективне.
The thesis for the degree of candidate of technical sciences, specialty 05.03.01 – machining processes, machines and tools. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2016. The thesis is sanctified to the exposure of basic conformities to law of influence of oblique–angledness and differently inclined points of end–capping cylindrical milling cutter on the increase of her vibration stability and quality of a treat surface at milling of the thin–walled element of detail. Construction of measuring stand and system of evaluation of results, and also the worked out construction of experimental end–capping cylindrical milling cutter with the managed angle of slope of every tooth allowed to define influence of oblique–angledness and differently inclined points on the oscillation processes excited at milling. On results the conducted experiments qualificatory correlation is set forth distinguished speed zones of vibrations of the thin–walled element of detail. It is set that increase of angle of slope of cutting edge w from 30° to 45° promotes vibrofirmness of process of the cylindrical milling. The turn of axis of rotation of milling cutter positively influences on the regenerative oscillation damping and reduces the parameter Ra of rejection of profile of a treat surface. A flat ribbon on a back surface renders substantial influence on the decline of parameter of scope of self–excited oscillations R2. Sharpening of ribbon on the back surface of differently inclined points allows additionally to decrease the scope of self–excited oscillations. At high–speeds of milling, when self–excited oscillations degenerate, application of milling cutters with differently inclined points is not effective.
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Nemir, M. T. M. "Finite element stability analysis of thin-walled steel structures." Thesis, University of Salford, 1985. http://usir.salford.ac.uk/2219/.

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Recent applications in the use of light gauge steel members have been concerned with developing large scale systems built entirely from cold-formed steel members. An explicit analysis of such structures is complicated by the different phenomena that the structure may be prone to during loading. In particular, elastic buckling phenomena is an important consideration in the design of such structures since the load at which buckling occurs often provides a close upper bound to the carrying capacity of the structure. The first part of this two-part thesis (Part I, Chaptersl-8) has been devoted to general methods of analysis of the torsional-flexural buckling of thin-walled structures. A review of previous investigations and the available methods of solution is presented. A general finite element formulation of the torsional-flexural buckling of thin-walled structures has been derived. The resulting elastic geometric matrix can be used to analyse structures with monosymmetrical members. It also includes the effect of sectorial-monosymmetry for cross-sections without any axis of symmetry. A general transformation matrix has been developed to allow for the application of the finite element method to the three-dimensional elastic stability analysis of space and portal frames. The validity and accuracy of the new finite element formulation have been checked by analysing a number of different elastic lateral buckling problems for which exact or highly accurate solutions by other techniques are available. An experimental program was carried out on simply supported cold-formed steel z-beams. The first part of this program was undertaken to check the validity of the finite element calculations of the bimoments caused by nonuniform torsion. The second part was devoted to elastic lateral buckling of z-beams under combined bending and torsion. The second part of this thesis (Part II, Chapter 9) deals with the analysis of hipped roof structures with corrugated steel roof sheeting. A simple theoretical model has been suggested. The model has been used to perform an elastic linear analysis of the behaviour of two types of the hipped roof structures. The theoretical results are compared with previous experimental results for these two structures.
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Lentz, W. Karl. "Optimum coupling in thin-walled, closed section composite beams." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12018.

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Liang, Ce. "Analysis of crashworthiness of the dimpled thin-walled structures." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/78870/.

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Thin-walled structures are often used as kinetic energy absorbers in vehicular systems and infrastructure designs. In such applications, high specific energy absorption is usually desirable, because it is beneficial for weight reduction. The dimpling cold-roll metal forming process introduces dimpled geometry and increases the strength of sheet metal. This thesis aims to investigate the energy absorption characteristics of the dimpled thin-walled structures. A finite element (FE) modelling analysis was performed using ANSYS Explicit Dynamics solver, to predict the response of dimpled structures to dynamic and quasi-static loads. A series of experimental tests were conducted and the FE method was validated through comparing the numerical and experimental results. To understand the response of the dimpled structural components to axial crushing loads, numerical simulations were performed. A parametric study on a key cold-roll forming parameter “forming depth” was carried out to evaluate its effects on the dimpled geometry and material properties. Through the parametric study, manufacturing parameters for the cold-roll forming process were suggested to improve yield strength and energy absorption performance of dimpled steel components. It was shown that the specific energy absorption can be increased by up to 16% after optimizing the forming depth. To take the most advantage of the dimpled geometry, multi-layer dimpled thin-walled columns were analysed. The interlocking mechanism of dimpled plates were investigated and an empirical model was proposed to describe the interaction between dimpled plates. It was shown that a considerable amount of energy can be absorbed through the interaction between dimpled walls. The behaviour of dimpled columns under lateral impact loads was also investigated. It was revealed that the introduced dimpled geometry contributes to reducing the peak impact force without sacrificing the energy absorption capacity. However, this is only valid when at least one end of the dimpled thin-walled column is fully restrained.
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Oldenburg, Mats. "Finite element analysis of thin-walled structures subjected to impact loading." Doctoral thesis, Luleå, 1988. http://epubl.luth.se/avslutade/0348-8373/69/index.html.

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Li, F. "Impact of thin walled shell structures using a simplified finite element model." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47104.

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Harursampath, Dineshkumar. "Non-classical non-linear effects in thin-walled composite beams." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12501.

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Mohammed, Ali Hjaji. "Steady State Response of Thin-walled Members Under Harmonic Forces." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24013.

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The steady state response of thin-walled members subjected to harmonic forces is investigated in the present study. The governing differential equations of motion and associated boundary conditions are derived from the Hamilton variational principle. The harmonic form of the applied forces is exploited to eliminate the need to discretize the problem in the time domain, resulting in computational efficiency. The formulation is based on a generalization of the Timoshenko-Vlasov beam theory and accounts for warping effects, shear deformation effects due to bending and non-uniform warping, translational and rotary inertial effects and captures flexural-torsional coupling arising in asymmetric cross-sections. Six of the resulting seven field equations are observed to be fully coupled for asymmetric cross-sections while the equation of longitudinal motion is observed to be uncoupled. Separate closed form solutions are provided for the cases of (i) doubly symmetric cross sections, (ii) monosymmetric cross-sections, and (iii) asymmetric cross-sections. The closed-form solutions are provided for cantilever and simply-supported boundary conditions. A family of shape functions is then developed based on the exact solution of the homogeneous field equations and then used to formulate a series of super-convergent finite beam elements. The resulting two-noded beam elements are shown to successfully capture the static and dynamic responses of thin-walled members. The finite elements developed involve no special discretization errors normally encountered in other finite element formulations and provide results in excellent agreement with those based on other established finite elements with a minimal number of degrees of freedom. The formulation is also capable to predict the natural frequencies and mode-shapes of the structural members. Comparisons with non-shear deformable beam solutions demonstrate the importance of shear deformation effects within short-span members subjected to harmonic loads with higher exciting frequencies. Comparisons with shell element solution results demonstrate that distortional effects are more pronounced in cantilevers with short spans. A generalized stress extraction scheme from the finite element formulation is then developed. Also, a generalization of the analysis procedure to accommodate multiple loads with distinct exciting frequencies is established. The study is concluded with design examples which illustrate the applicability of the formulation, in conjunction with established principles of fatigue design, in determining the fatigue life of steel members subjected to multiple harmonic forces.
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Akman, Mehmet Nazim. "Analysis Of Thin Walled Open Section Tapered Beams Using Hybrid Stress Finite Element Method." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609246/index.pdf.

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In this thesis, hybrid stress finite element is formulated for the analysis of the isotropic, thin walled, open section beams with variable cross sections. The beam element has two nodes each having seven degrees of freedom. Assumption of stress field is sufficient to determine the element stiffness matrix. Axial, flexural and torsional effects are taken into account in the analysis. The methodology can be applied both to the tapered and the uniform beams. Throughout this study, firstly element cross-sectional properties are computed using the flow analogy of the inter-connected elements which may have different thicknesses. Then another computer program calculates the displacements and stresses at the nodes along the beam. The results obtained are compared to the results taken from literature and commercial FEM program Nastran.
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Books on the topic "Thin-walled element of detail"

1

Nemir, Mohamed Taher Mohamed. Finite element stability analysis of thin-walled steel structures. Salford: University of Salford, 1985.

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2

Bernadou, M. Finite element methods for thin shell problems. Chichester: Wiley, 1996.

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Bernadou, Michel. Finite element methods for thin shell problems. Chichester: John Wiley, 1996.

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Noor, Ahmed Khairy. Mixed finite element models for free vibrations of thin-walled beams. Hampton, Va: Langley Research Center, 1989.

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Riks, E. A finite element analysis of cracks in a thin walled cylinder under internal pressure. Amsterdam: National Aerospace Laboratory, 1987.

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6

Carden, Huey D. Free vibrations of thin-walled semicircular graphite epoxy composite frames. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Carden, Huey D. Free vibrations of thin-walled semicircular graphite epoxy composite frames. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Carden, Huey D. Free vibrations of thin-walled semicircular graphite epoxy composite frames. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Carden, Huey D. Free vibrations of thin-walled semicircular graphite epoxy composite frames. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Gotsis, Pascal K. Progressive fracture of fiber composite thin shell structures under internal pressure and axial loads. [Washington, DC]: National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Thin-walled element of detail"

1

Rajagopalan, Krishnaiyengar. "Finite Element Analysis of Thin-Walled Structures." In Torsion of Thin Walled Structures, 137–73. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7458-7_6.

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Zhang, Shun-Qi. "Finite Element Formulations." In Nonlinear Analysis of Thin-Walled Smart Structures, 77–99. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9857-9_5.

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Kubiak, Tomasz. "Finite Element Method." In Static and Dynamic Buckling of Thin-Walled Plate Structures, 67–96. Heidelberg: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00654-3_4.

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Pang, Toh Yen, Dale Waterson, Rees Veltjens, and Tristan Garcia. "Nonlinear Finite Element and Post-Buckling of Large Diameter Thin Walled Tubes." In Nonlinear Approaches in Engineering Applications, 219–33. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09462-5_8.

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Yin, Bangqi, Degui Liu, Xiangyi Xue, Yang Wu, Hongchao Kou, and Jinshan Li. "Finite Element Simulation of Hot Spinning for GH4169 Superalloy Thin-Walled Shell." In Lecture Notes in Mechanical Engineering, 1265–77. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0107-0_120.

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Venkatesh, A., and J. Jirousek. "A Finite Element Formulation for the Analysis of Local Effects." In Contact Loading and Local Effects in Thin-walled Plated and Shell Structures, 218–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-02822-3_27.

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Yuan, Xuekan, Taili Jin, Ming Zhi Liu, and Liheng Li. "Finite Element Analysis of the Stability of Open Thin-Walled Structure with Diaphragms." In Computational Mechanics ’86, 609–13. Tokyo: Springer Japan, 1986. http://dx.doi.org/10.1007/978-4-431-68042-0_83.

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Nedelcu, Mihai, Nicolae Chira, and Hortensiu L. Cucu. "Vibration Mode Decomposition from Finite Element Analysis of Axially Compressed Thin-Walled Members." In Design, Fabrication and Economy of Metal Structures, 139–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36691-8_21.

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Naumenko, K., and H. Altenbach. "Shell and Solid Type Finite Element Analysis of Creep in Thin-Walled Structures." In Theories of Plates and Shells, 165–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39905-6_20.

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Niesterowicz, Beata, Tomasz Okulik, Stefan Berczyński, and Paweł Dunaj. "Finite Element Modelling of Thin-Walled Box Beams Partially Filled with Polymer Concrete." In Lecture Notes in Networks and Systems, 74–84. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93377-7_7.

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Conference papers on the topic "Thin-walled element of detail"

1

Rogers, J. B. C., W. Zhuang, A. H. Shah, and N. Popplewell. "Guided Waves in Thin-Walled Structural Members." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0891.

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Abstract Infrastructures are deteriorating and billions of dollars are spent to rehabilitate them. Civil structures usually comprise of pavements and bridge decks (plates), pipelines (cylinders), and structural members having, say, I, L, etc. cross sections. The deterioration of these structures causes flaws arising from factors such as the severity of the weather, aging, corrosion, fatigue cracks, etc... The flaws degrade the stiffness (material properties) of a structure and severe conditions eventually can result in a catastrophic failure. Thus, the detection and characterization of the flaws is important in evaluating and monitoring the integrity of existing structures and determining the viability of their continued use or a change in use. Therefore, it is necessary to employ a reliable and effective, quantitative nondestructive evaluation (QNDE) to characterize the mechanical properties and identify defects in the structures. Ultrasonic waves provide such a technique but a knowledge of guided elastic waves is required. Considerable information is available for waves in plates and cylinders but very little work has been reported in the literature on the waves in thin-walled, structural members. In this paper, a semi-analytical finite element (SAFE) formulation is proposed to study the wave propagation characteristics of thin-walled members. Common structural members are considered as an assemblage of thin plates. The members are assumed to be infinitely long in the longitudinal (axial) direction. The ratio of the thickness of the plate to the wavelength in the axial direction is assumed to be small so that the plane-stress assumption is valid. Employing a finite element modeling in the transverse direction circumvents difficulties associated with the cross-sectional profile of the member. The dynamic behavior is approximated by dividing the plates into several line (one-dimensional) segments and representing the generalized displacement distribution through the segment by polynomial interpolation functions. By applying Hamilton’s principle, the dispersion equationis obtained as a standard algebraic eigenvalue problem. The accuracy of the proposed method is demonstrated by comparing the results with analytical solutions. Detailed numerical results are presented for an I shaped cross section.
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Fasching, Stephan, Sara Reichenbach, Tobias Huber, and Johann Kollegger. "Post tensioned box girder bridges made from thin-walled pre- fabricated elements." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1520.

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<p>Nowadays large box-girder concrete bridges are either built using pre-cast segmental erection or in-situ casting of concrete. Using these methods sets limitations when it comes to construction speed or to segment length due to the weight of full-cast concrete segments. To close the gap between the two construction approaches, the Institute of Structural Engineering of the TU Wien has developed new technologies for bridge construction using thin-walled pre-fabricated elements originally used in building construction. Based on these developments, an innovative construction method has been proposed, which consists of the following steps:</p> <ul> <li>Highly automated production of thin-walled concrete elements in a pre-casting-plant</li> <li>On-site production of box-girder segments using thin-walled elements</li> <li>Connection of the segments with post-tensioning tendons to form a bridge girder</li> <li>Installation of the girder to its final position using any construction method as for example incremental launching or the balanced lift method</li> <li>Pumping of in-situ concrete, to complete the girder in the final position</li> </ul> <p>The presented research shows, that this approach is advantageous for construction methods, with large differences in bending moment distribution during the construction stages and the final state. The required amount of materials cannot only be reduced, but the construction process can be accelerated as well, therefore improving the efficiency in bridge construction. Results of tests on large-scale specimens, which will be described in detail, show the potential of the new method.</p>
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Wang, Hua, and Suo Si. "A FEA Simulation Model for Thin-Walled C-Section Composite Beam Assembling With R-Angle Deviation." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36956.

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There are unavoidable deviations, such as shrinkage and distortions, in the composite detail parts production due to the complexity of composites fabrication. Interests in the assembly analysis of composite beams have led to a need for more accurate analysis especially in the case of fabrication deviations. This work proposes a numerical finite element model of thin-walled C-section composite beam with R-angle deviation for assembling. The rule of Hashin failure combined with cohesive element is applied to study the mechanical performance of the fiber and matrix (implemented as user subroutine UMAT in ABAQUS) while positioning and clamping. Tension and compression tests are carried out based on available standards to determine the C-section beam behavior under load. The testing data validates the proposed numerical model. The numerical model captures the experimentally obtained results with minimal error, and predicts the failure modes successfully. The proposed model allows to determine accurately the first failure location and the associated load level. It will enhance the understanding of the composite components pre-loading analysis, and help systematically improving the composites assembling efficiency in civil aircraft industry.
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Malik, Afzaal M., Ejaz M. Qureshi, Naeem Ullah Dar, and Iqbal Khan. "Residual Stress Fields Under Different Clamping Conditions in Circumferentially Welded Thin-Walled Cylinders." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48422.

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Arc welding is a reliable joining method widely utilized in nuclear, pressure vessels, aerospace and aeronautical structures to ensure the intended in service behaviour during the thermal and/or pressure loadings. Weld induced deformations and high residual stresses often occur during the course of welding. These cause significant threats for the structural integrity of the nuclear power plant components, particularly in stress corrosion inhibited environments owing to the risk of stress corrosion cracking (SCC). In this research, the consequences of five different structural boundary conditions on the evolution of residual stress fields after the welding are investigated. Both experimental and numerical simulations based on finite element modeling are employed during the course of investigation. Full three-dimensional FE models for the circumferentially, arc welded thin-walled cylinders are developed in ANSYS®. The complex coupled, thermo-mechanical phenomenon during the welding is simulated by sequentially coupled approach enhanced by user written APDL subroutines. The role of welding restraints in minimizing / optimizing the residual stresses is presented and discussed in detail. The result reveals that residual stresses show weak dependence on the degree of the restraints. Although the stress levels slightly varies in magnitude, but similar trend is observed for all the structural clamping conditions under study. Simulation results validated through full-scale experiments with high-tech reliably instrumented welding and measuring equipments shows promising features of the developed modelling and simulation strategy for use in shop floor applications.
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Sadeghi-Esfahlani, Shabnam, Hassan Shirvani, Sunday Nwaubani, and Ayoub Shirvani. "Design Attributes for Geometry Optimization Process of Thin Walled Honeycomb Structures." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47080.

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Thin walled cellular structures have the ability to absorb impact energy during crashing thus it is important to enhance the crashing efficiency and optimise the structural reliability. This paper discusses the honeycomb cell configuration optimization procedure. For the design optimization, the response surface method (RSM) is used to formulate the complex design where the energy absorption (EA) representing the structure’s ability of absorbing energy was selected as objective, the Y split side parting length w1, w2, and thickness T1 are defined as three design variables, and the maximum crushing force (Max.F) occurs as constraint. During this distinctive optimization, the (RSM) was combined with detailed geometrically simplified finite element (FE) model using ANSYS/LS-DYNA (pre-processor), LS-DYNA (solver) and LS-Opt (optimiser). RSM combined with (FE)model without user intervention, was the effective tool to optimize non-linear impacted cellular structures. Optimal design achieved through LS-OPT is compared to the validated results for accuracy and effectiveness.
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Qureshi, Ejaz M., Afzaal M. Malik, and Naeem Ullah Dar. "Thermo-Mechanical Analysis of Residual Stresses in Arc Welded Thin-Walled Cylinders." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48431.

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The problem of reduced strength of the structures in and around the weld zone due to the residual stresses in arc welding process is a major concern of the welding industry for decades. The prediction of the transient and residual stress fields during and after the completion of the welding process is of critical importance to ensure the structural integrity of welded structures. Circumferentially welded thin-walled cylinders are widely utilized in many engineering applications including the oil transportation system, boiler and pressure vessel industries. This paper presents a detailed three-dimensional finite element (FE) study to investigate the welding induced residual stresses in circumferentially welded thin-walled cylinders. The complex phenomenon of arc welding is numerically solved by sequentially coupled transient, non-linear thermo-mechanical analysis approach to simulate Gas Tungsten Arc (GTA) Welding process. Single pass butt-welded geometry with single “V” groove for two 300 mm outer diameter cylinders with 3 mm wall thickness and 150 mm length are used in numerical simulations. Temperature dependent thermo-mechanical behavior for low carbon steel is modeled and filler metal deposition by using the element birth and kill features is incorporated. Widely accepted double ellipsoidal GOLDAK heat source model for arc welding is introduced and implemented. Simulation of the entire welding process is accomplished by using author written subroutines in ANSYS®, general purpose FE software. The accuracy of the developed FE simulation strategy is validated with experimentation for temperature distribution and residual stresses.
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7

Gopal, K. V. N., and B. Dattaguru. "Automated Modeling and Crack Growth Simulation in Pressurized Thin Shell Panels With Multi-Site Damage." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1899.

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The residual strength estimation of thin-walled pressurized shell structures is of relevance to pressurized thin piping systems and aged airframes for life extension programs. This requires powerful and efficient computational techniques using finite element method and numerical fracture mechanics for elastic or inelastic stress analysis and crack growth simulation. For this purpose, detailed modeling and finite element mesh generation of built-up structures like stiffened cracked thin shells is necessary and it is a computationally intensive task. Automating the entire process from geometric modeling to stress analysis and crack growth simulation (requires remeshing) vastly improves the efficiency of the computational analysis and reduces the chances of modeling and simulation errors. A geometric primitive based technique has been developed for automated modeling and meshing. The work is carried out primarily on aged fuselage shell panels but the method is applicable to other pressurized thin piping systems. This paper presents a simple and efficient computational procedure using a geometry based logic and surface mesh generation technique for automated modeling and crack growth simulation in pressurized thin-walled shells. The approach has been used to develop a structural integrity evaluator software. Finite element analysis is carried out using a commercial software, and these results are fed to the structural integrity evaluator. Some results of the nonlinear finite element analysis and elastic-plastic stable crack growth simulation in pressurized stiffened fuselage panels using this approach are presented.
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Romanoff, Jani, Heikki Remes, Petri Varsta, Bruno Reinaldo Goncalves, Ingrit Lillemäe-Avi, Mihkel Körgesaar, Jasmin Jelovica, and Sami Liinalampi. "Limit State Analyses in Design of Thin-Walled Marine Structures: Some Aspects on Length-Scales." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78304.

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Present paper gives an overview of the factors that affect the strength and structural design of advanced thin-walled marine structures with reduced plate thickness or alternative topologies to those used today in marine industry. Due to production-induced initial deformations and resulting geometrical non-linearity, the classical division between primary, secondary and tertiary responses becomes strongly coupled. Volume-averaged, non-linear response of structural element can be used to define the structural stress strain relation that enables analysis at the next, larger, length scale. This, today’s standard homogenization process needs to be complemented with localization, where the stresses are assessed at the details, such as welds for fatigue analysis. Due to this, the production-induced initial distortions need to be considered with high accuracy. Another key question is the length-scale interaction in terms of continuum description. Non-classical continuum mechanics are needed when consequtive scales are close. Strain-gradients are used to increase the accuracy of the kinematical description of beams, plates and shells. The paper presents examples of stiffened and sandwich panels covering limit states such as fatigue, non-linear buckling and fracture.
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Warren, A. P., S. K. Bate, R. Charles, D. M. O’Gara, P. M. Wood, and A. Gregg. "The Effect of Modelling Simplifications on the Prediction of Residual Stresses in Thin-Walled Pipe Butt Welds." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93384.

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The inherent complexity of modelling welding processes and the lack of computational power available to analysts has resulted in simplified methods being commonly utilised when predicting residual stresses. Despite considerable advances in computational power, it is still often not possible to run detailed 3D analyses of complex welded geometries within practical timescales. Against this background, a programme of work has been undertaken to develop a weld modelling procedure which can be followed by analysts. This procedure will account for how various modelling simplifications affect the predicted values of residual stress. One common geometry, which it is often necessary to analyse using modelling simplifications is that of a thin-walled pipe butt weld. Typically this geometry is simulated using a 2D axisymmetric analysis. Despite the popularity of this modelling simplification the effects of its use are not fully understood. In order to feed into this procedure, work has therefore been conducted to better understand the effects modelling simplifications will have on the residual stress levels that are predicted when simulating multi-pass pipe butt welds. The geometry considered in this study is the thin walled austenitic pipe butt weld specimen originally studied in VORSAC 5th Framework European Union project. This paper presents the results of a number of finite element analyses conducted of this geometry. These analyses have been conducted using a combination of the finite element codes SYSWELD and ABAQUS. The aim of this study was to understand the effect that the use of 2D axisymmetric analyses, and other modelling simplifications, namely block dumping and bead lumping will have on the predicted values of residual stress.
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Ai, X., and B. Q. Li. "A Discontinuous Finite Element Method for Non-Fourier Heat Conduction Problems." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42064.

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A discontinuous Galerkin finite element method is presented for the solution of non-Fourier heat conduction problems that arise from the thermal processing of thin films using the ultra-short pulsed lasers. Mathematical formulation is described in detail and computational procedures are given. Numerical example are given and compare with available solutions where available. The numerical solutions exhibit strong wave behavior and reflection and interactions of thermal waves at the boundaries in multi-dimensions.
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