دانلود رایگان مقاله لاتین لوله تحت خمش از سایت الزویر
عنوان فارسی مقاله:
مقاومت پلاستیک کامل لوله ها تحت خمش و نیروی محوری: درمان دقیق و تقریب
عنوان انگلیسی مقاله:
Full Plastic Resistance of Tubes Under Bending and Axial Force: Exact Treatment and Approximations
سال انتشار : 2017
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مقدمه انگلیسی مقاله:
1. Introduction
The full plastic resistance of tubes of all possible wall thicknesses and under all combinations of bending and axial forces does not ever seem to have been thoroughly studied, despite the fact that this is a welldefined problem that requires only a fairly simple analysis. However, the derivation leads to relatively complicated algebraic expressions which are unsuitable for design guides and standards, so the main purpose of this paper is to devise suitably accurate but simple descriptions that give quite precise values for the state of full plasticity whilst avoiding the complexity of a formal exact analysis. Because the condition of full plasticity of the perfect undeformed structure using ideal elastic-plastic material properties is one of the key reference states used in design rules [8,9,16,17], it is important that this state should be accurately defined. It seems very likely that others may have performed the formal exact analysis for the full plastic condition under both bending and axial force long ago, but the authors have only traced the work of [21] after the review of this paper. Written in French and in a special revue, it was somewhat inaccessible. There consequently seems to be no identifiable basis for the rather varied full plastic interaction expressions used in current standards (e.g. [1–3,8,15]). The focus of this paper is on the development of suitable approximations for application in design guides and standards, as some of the existing approximate rules in standards are shown to be surprisingly inaccurate for such a formally preciselydefined problem. The formal algebraic analysis of the state of full plasticity in a tube of any thickness is presented here, with the two limiting cases of a thin tube (cylindrical shell) and circular solid section shown as special cases of the full relationship. Because the general equations are too complicated for use in design calculations, two different sets of approximate formulas are presented together with a demonstration of the level of approximation associated with each. Simpler approximations produce greater errors. These expressions are useful for the definition of the full plastic condition in tubular structural members, with special application for tension members subject to small bending actions, but also applicable to steel building structures standards and standards on thin shells where they provide the full plastic small displacement theory reference resistance. These expressions are also useful because they give simple definitions of the orientation of the plastic strain vector, which can assist in the development of plastic analyses of a particular class of redundant structures, including arches and axially restrained members under bending. It should be recognised that the ultimate resistance of tubular members is affected by many other phenomena: elastic and elastic-plastic stability [7,11,19], ovalisation in long members under bending [4–6, 12,13,18], nonlinearity of the stress-strain relationship in metals other than mild steel [14] and geometric imperfections [10]. All these effects modify the resistance significantly, but the reference resistance against which all these modifications are made is the fully plastic state using an ideal elastic-plastic constitutive law and the undeformed perfect geometry [20]. For this reason, the analysis presented here gives the basic reference case, and it is important that it should be defined with precision.
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کلمات کلیدی:
Tube Bending Under Axial Force and Internal Pressure | Journal of ... manufacturingscience.asmedigitalcollection.asme.org/article.aspx?articleid=1450647 by J Wang - 2006 - Cited by 42 - Related articles Tube bending is a widely used manufacturing process in the aerospace, automotive, and various other industries. During tube bending, considerable in-plane ... Abstract · Introduction · Analytical Model · Model Predictions Tube Bending Under Axial Force and Internal Pressure - Journal of ... materialstechnology.asmedigitalcollection.asme.org/data/journals/jmsefk/.../598_1.pdf?... College Station, TX 77843. Tube Bending Under Axial Force and Internal Pressure. Tube bending is a widely used manufacturing process in the aerospace, ... Thin-Walled Structures: Advances in Research, Design and ... https://books.google.com/books?isbn=0750310065 J. Loughlan - 2004 - Science TUBES. F.Guarracino '. A.Giordano2 and A.C.Walker3 1 Dip. di Scienza delle ... of thin-walled tubes under bending moment and axial force is presented here. Computational Mechanics Abstract: Abstracts of the Papers Presented ... https://books.google.com/books?isbn=7302093415 Zhenhan Yao, M W Yuan Z H Yao W X Zhong - 2004 - Engineering design Tube. Bending. under. Axial. Force. and. Internal. Pressure. Rohit Agarwal ' , Jyhwen Wang 1 Department of Mechanical Engineering, Texas A&M University, ... Tubular Structures XIV - Page 525 - Google Books Result https://books.google.com/books?isbn=020307310X Leroy Gardner - 2012 - Technology & Engineering How- ever, little theories were devoted to study foam-filled tubes under ... In regards to foam-filled tubes subjected to axial bined bending, axial force and lateral ... Steel - A New and Traditional Material for Building: Proceedings of ... https://books.google.com/books?isbn=0415408172 Dan Dubina, Viorel Ungureanu - 2006 - Technology & Engineering Joint types. under axial force, bending moment and their combination. And the design method, for welded spherical joints and tubal joints of rectangular tubes ...
