Дисертації з теми "Bending-creep"
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Matar, Ali. "The mechano sorptive creep of softwood in bending." Thesis, London South Bank University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288110.
Повний текст джерелаShelton, Christopher Francis. "The mechano-sorptive creep of wood in bending." Thesis, London South Bank University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329808.
Повний текст джерелаGul, Rizwan Mahmood 1967. "Bending fatigue and creep of tough matrix laminates." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/17388.
Повний текст джерелаCraig, Bruce A. "Comparison of creep/duration of load performance in bending of Parallam® parallel strand lumber to machine stress rated lumber." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26194.
Повний текст джерелаForestry, Faculty of
Graduate
Wang, Jianfeng. "Principles of the draw-bend springback test." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1080227128.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xvii, 167 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Robert H. Wagoner, Dept. of Materials Science and Engineering. Includes bibliographical references (p. 158-167).
Jianfeng, Wang. "Principles of the draw-bend springback." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1080237228.
Повний текст джерелаFrançois, Emmanuel. "Modèles éléments finis du formage du verre par procédés Press-bend et Blow-bend : Optimisation des paramètres process par méthode inverse." Valenciennes, 1997. https://ged.uphf.fr/nuxeo/site/esupversions/0caa37a3-30f2-4654-b2ac-dde557896c18.
Повний текст джерелаMalakoski, Joice. "Pilares esbeltos de concreto armado com seção variável." Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-22022018-152222/.
Повний текст джерелаThe recommendations of Brazilian Code NBR-6118/1978 and Comité Euro-Internacional du Béton Model Code CEB-1990 are described, for stability verification of concrete slender columns with variable cross sections, subjected to axial load and bending moment, using the exact method. To obtain the second order bending moments, the Engesser-Vianello method and the numeric integration of the cross section curvatures along the longitudinal axial of column method are described. To obtain of bending moment supported by the cross sections due to curvature resultant of the column flexure under axialload, expressions for rectangular and circular (full and hollow) cross sections are developed, using stress-strain relations for materials proposed by model codes above mentioned. It\'s also presented a software written in PASCAL language for microcomputer and destined to column stability verification, with option to adopt the NBR-6118/1978 or CEB-1990 model code recommendations. Effects due to vibrations were nor included. Methods to take in account creep effects were described.
Moreau, Philippe. "Nouvelle stratégie pour le formage de produits plats vers une géométrie complexe avec conception assistée par ordinateur modèles éléments finis et métrologie : Application au fluage et pressage de verre plat." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/fc1970be-0071-4fd7-b31c-fe536a37e53e.
Повний текст джерелаSaulnier, Florence. "Influence de traitements physico-chimiques des renforts sur le comportement mécanique des composites à base de co-produits de bois." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00959532.
Повний текст джерелаSeidel, André. "Entwicklung eines Berechnungsmodells für das Langzeitverhalten von Stahlbeton und textilbewehrtem Beton bei überwiegender Biegebeanspruchung." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-23984.
Повний текст джерелаStructures of reinforced concrete show a time-varying material behaviour due to creeping and shrinking of the concrete. This results in the rearrangement of the stresses in the cross-section and time-depending increase of the deformations. Qualified calculation models enabling a reliable prediction during the design process are necessary for the assessment of the long-term behavior. Not only pure reinforced concrete structures play an important role, but within retrofitting actions textile reinforcements of carbon and AR-glass fibres are applied in order to enhance the load-bearing capacity. A small concrete-layer-thickness can be achieved by the load-compatible application of reinforced textile configurations and the usage of a special certain fine-grained concrete. It leads to a composite section of different concrete recipes, different concrete ages and also several components of reinforcement. To give statements for the long-term behaviour of such constructions, a holistic examination considering all this influencing modules with their particular material properties is necessary. Within this dissertation in a first step the material laws of the participated components, as concrete, steel and textile reinforcement, are defined. The focus is layed on the visco-elastic behaviour of the concrete. For its mechanical specification a reliable rheological model in terms of a spring-dashpot-combination is developed and the appropriate stress-strain-time-relation is derived. Furthermore the calibration of the required material parameters considering creep and shrinkage by means of common calculation approaches (e.g. EUROCODE 2) is demonstrated. For the textile fibres a linear-elastic behaviour is assumed within the calculation model. It is also refered to alternative approaches considering a visco-elastic characteristic and the calculation model is configured extendable to that effect. In a second step the material models of the single components are correlated taking into account the mechanical basic principles of equilibrium and compatibility as well as the BERNOULLIan theorem of the plane cross-section. Therefore an incremental calculation procedure is required, which starts at the moment of the first load-application and calculates the subsequent configuration step by step. In the result an algorithm is derived, that realistically captures the occuring changings of stress and strain in the cross-section by considering the steel reinforcement as well as a possibly existing layer of textile concrete. For statically determined systems with known section force status it is demonstrated how to calculate the existing condition of strain and following the deflection via the curvaturve at every time and at each position. The third step - for many practical applications the most important one - is the transformation of the derived relations at the cross-section into a finite beam-element and the implementation of this in a FE-routine. This also takes place in an incremental way, whereat for each time-increment the increase of stress and strain for all elements is identified by using the NEWTON-RAPHSON-method within the iteration process for the equilibrium condition of the whole system. Meaningful numerical examples are presented and the effects of creep and shrinkage are explained by depicting the consequences for the particular bearing structure. Moreover it is shown how the purposeful use of textile reinforcement strengthening methodes can influence and enhance the load-bearing and deflection characteristics of existing building constructions by considering the time-varying material behaviour
Ponsot, Bernard. "Influence de la matrice sur le comportement a long terme de composites carbone-epoxyde." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0058.
Повний текст джерелаŠimek, Ondřej. "Návrh kruhové betonové nádrže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-401475.
Повний текст джерелаJalali, Syed Idrees Afzal. "Evaluation of Power-Law Creep in Bending." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4547.
Повний текст джерелаchun-hsien, Chiu, and 邱俊賢. "Experimental Investigation on Creep Behavior of Thin-Walled Tubes Subjected to Pure Bending." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/46724241894406697736.
Повний текст джерелаYu-ShengChang and 張育生. "Experimental Study on Creep Response of Sharp-Notched Circular Tubes Under Pure Bending." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/30203791779982713472.
Повний текст джерела國立成功大學
工程科學系碩博士班
100
In this study, the relative mechanical behavior and buckling failure of sharp-notched SUS 304 stainless steel tubes with notch depths of 0.2, 0.4, 0.6, 0.8 and 1.0 mm subjected to pure bending creep are investigated. The pure bending creep is to bend the tube to a desired moment and keep that moment for a period of time. From the experimental result, the creep curvature and ovalization increase with time until the tube buckles. Higher desired moment leads to the higher creep curvature and ovalization. Finally, referring the Bailey-Norton formulation for uniaxial creep, a formulation is proposed for simulating the first and second stages of the creep curvature – time for SUS 304 stainless steel tubes subjected to pure bending creep. Through comparing with the experimental finding, the theoretical analysis can reasonably describe the experimental result.
Shie, Rie Fong, and 徐日豐. "Endochronic simulation of V iscoplastic,Creep and relaxation for Thin-Walled Tube under Pure Bending." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/98355314002784312879.
Повний текст джерелаchien, shih po, and 簡士博. "An Study on Creep of Different Diameter/Thickness Ratio for Thin-Walled Tubes under Pure Bending." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/89508623568274318739.
Повний текст джерелаWang, Jiunn-Jie, and 王俊傑. "Bending/Torsion Steady Creep Analysis of 97.5Pb/2.5SnThin-Walled Tubes via Deformation Kinetics and J2 Theories." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/11371181574640011468.
Повний текст джерела國立成功大學
工程科學系碩博士班
93
Abstract Material parameters in the deformation kinetics (DK) and the J2 theory are determined from Darveaux and Banerji shear creep data of 97.5Pb/2.5Sn at 299K, 353K and 407K. The theoretical predictions of two different theories are in very well agreement with the experimental data, but at 299K the theoretical predictions by DK is about 10 times larger than those of J2 theory. However, the predictions of creep strain rate under uniaxial tensile stress of the two theories are not very alike. At various temperatures, the predictions of DK in the stress range higher than the engineering cut-off stress are larger than the predictions of J2, and their tendencies are deviated each other. From Bending/Torsion steady creep analysis of 97.5Pb/2.5Sn thin-walled tubes via DK and J2 theories, the analysis show that (1) under constant temperatures and constant torque with changing bending moment, the coupling effect of bending and twisting of DK on twist rates, are smaller than J2 theory, while the curvature rates of two theories are on the contrary. (2) under constant temperatures and constant bending moment with changing torque, the plot of torsion vs. curvature rate illustrates the coupling effect by bending and twisting of DK on curvature rate , are smaller than J2 theory, while the coupling effect of twist rates are opposite. The methodology of Bending/Torsion steady creep employed in this paper can be used for engineering design.
Goel, Priya. "Extraction of Equivalent Uniaxial Plastic and Viscoplastic Behavior from Bending Using a Mechanistic Approach." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5863.
Повний текст джерелаARDB 0242, IMPRINT 0009
FAN, Chun Huei, and 范春暉. "An Experimental Study on the Effect of Curvature Rate at Preloading Stage on Subsequent Creep and Relaxation of Thin- Walled Tubes under pure Bending." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/07086285724133618860.
Повний текст джерела