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Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Buckling experiments"

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Nehme, Kinga, András Jakab, and Salem Georges Nehme. "Experiments on the buckling behaviour of glass columns. Part 1." Epitoanyag - Journal of Silicate Based and Composite Materials 65, no. 3 (2013): 62–66. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2013.13.

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2

Nehme, Kinga, András Jakab, and Salem Georges Nehme. "Experiments on the buckling behaviour of glass columns. Part 2." Epitoanyag - Journal of Silicate Based and Composite Materials 65, no. 4 (2013): 112–17. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2013.21.

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3

Mario M. Attard. "Global Buckling Experiments on Sandwich Columns with Soft Shear Cores." Electronic Journal of Structural Engineering 11 (January 1, 2011): 21–31. http://dx.doi.org/10.56748/ejse.11140.

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Several failure modes for sandwich columns under compression are said to be possible with shear crimping or shear buckling suggested for short columns with soft shear cores. The buckling formulas and theoretical assumptions of Engesser and Haringx for isotropic columns and soft shear core sandwich columns are reviewed. An important distinction is made between the isotropic column buckling formula attributed to Haringx and the theoretical assumptions underpinning his approach. It is shown that the theoretical approaches of Haringx and Engesser yield the same basic buckling equation for soft shear core sandwich columns when the thickness is very small in comparison to the core thickness, and the shear in the face sheets, the axial force in the core and the bending within the face sheets are ignored. To determine whether shear crimping (shear buckling) is a member or localised type of buckle, tests on low slenderness - short sandwich columns identified as possibly exhibiting shear crimping, were preformed. The test specimens were constructed from 10 mm thick Divinycell H45, H80, H100 and H200 foam for the core and 1 mm face sheets made of Aluminum 2024-T3. The lengths of the columns varied from 20 to 500 mm. The columns were endclamped according to ASTM C 364-99 [1] and placed in a servo-controlled compression testing machine. The width of the specimens was 100 mm and two specimens at each length were tested. The adhesive chosen was a toughened epoxy, trade name “Devcon Epoxy Plus". Measurements of the mid-span lateral displacement were used in a Southwell type plot to determine the elastic global buckling load. The shear modulus of the core was determined from three point bending tests according to ASTM-C-393 [2]. Some of the very short specimens failed with buckling of the face sheet within the clamped region. None of the tests exhibited shear crimpling or shear buckling modes and the global buckling loads for very short columns were much higher than the shear buckling limit of Engesser. Wrinkling failure was not considered.
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Tomblin, John, and Ever Barbero. "Local buckling experiments on FRP columns." Thin-Walled Structures 18, no. 2 (January 1994): 97–116. http://dx.doi.org/10.1016/0263-8231(94)90012-4.

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5

Wong-Chung, A. D., and S. Kitipornchai. "Partially braced inelastic beam buckling experiments." Journal of Constructional Steel Research 7, no. 3 (January 1987): 189–211. http://dx.doi.org/10.1016/0143-974x(87)90008-3.

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6

Hambly, E. T., and C. R. Calladine. "Buckling experiments on damaged cylindrical shells." International Journal of Solids and Structures 33, no. 24 (October 1996): 3539–48. http://dx.doi.org/10.1016/0020-7683(95)00194-8.

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7

Miyazaki, N., and S. Hagihara. "Bifurcation Buckling of Circular Cylindrical Shells Subjected to Axial Compression During Creep Deformation." Journal of Pressure Vessel Technology 115, no. 3 (August 1, 1993): 268–74. http://dx.doi.org/10.1115/1.2929527.

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In the present work, analytical and experimental investigations were performed on creep buckling. Special attention was focussed on bifurcation behavior during creep deformation. The finite element method was used to analyze creep buckling of circular cylindrical shells without initial imperfection. The number of circumferential waves obtained from the analyses agrees well with those of the experiments. The present experimental investigation shows that the circumferential waves are suddenly caused near a bulge. It is also found that there is no correlation between the wavelength of the circumferential waves observed at creep buckling and that of the circumferential initial imperfection. Deformation patterns at the bifurcation creep buckling obtained from the analyses are analogous to those of the experiments. It is concluded from the analyses and the experiments that the circumferential waves observed in creep buckling experiments are due to bifurcation buckling during creep deformation.
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8

O. Ifayefunmi, O. Ifayefunmi. "Buckling Experiments of Cracked Axially Compressed Cones." International Journal of Mechanical and Production Engineering Research and Development 10, no. 3 (2020): 5665–74. http://dx.doi.org/10.24247/ijmperdjun2020539.

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9

Zirakian, Tadeh, and Hossein Showkati. "Experiments on Distortional Buckling of I-Beams." Journal of Structural Engineering 133, no. 7 (July 2007): 1009–17. http://dx.doi.org/10.1061/(asce)0733-9445(2007)133:7(1009).

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10

Thompson, J. Michael T. "Advances in Shell Buckling: Theory and Experiments." International Journal of Bifurcation and Chaos 25, no. 01 (January 2015): 1530001. http://dx.doi.org/10.1142/s0218127415300013.

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In a recent feature article in this journal, coauthored by Gert van der Heijden, I described the static-dynamic analogy and its role in understanding the localized post-buckling of shell-like structures, looking exclusively at integrable systems. We showed the true significance of the Maxwell energy criterion load in predicting the sudden onset of "shock sensitivity" to lateral disturbances. The present paper extends the survey to cover nonintegrable systems, such as thin compressed shells. These exhibit spatial chaos, generating a multiplicity of localized paths (and escape routes) with complex snaking and laddering phenomena. The final theoretical contribution shows how these concepts relate to the response and energy barriers of an axially compressed cylindrical shell. After surveying NASA's current shell-testing programme, a new nondestructive technique is proposed to estimate the "shock sensitivity" of a laboratory specimen that is in a compressed metastable state before buckling. A probe is used to measure the nonlinear load-deflection characteristic under a rigidly applied lateral displacement. Sensing the passive resisting force, it can be plotted in real time against the displacement, displaying an equilibrium path along which the force rises to a maximum and then decreases to zero: having reached the free state of the shell that forms a mountain-pass in the potential energy. The area under this graph gives the energy barrier against lateral shocks. The test is repeated at different levels of the overall compression. If a symmetry-breaking bifurcation is encountered on the path, computer simulations show how this can be suppressed by a controlled secondary probe tuned to deliver zero force on the shell.
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Дисертації з теми "Buckling experiments"

1

Liu, Bing 1975. "FE analysis of plastic buckling of plates with initial imperfections and simulation of experiments." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100251.

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The general problem of plastic buckling of flat metal plates is a fundamental area of investigation in mechanics not only because of its intrinsic importance in the design of engineering structures, but also because it still has not been settled in a satisfying manner. Which theory of plasticity is the correct one to predict the buckling loads in the plastic range is a long-argued problem.
This thesis presents finite element analyses of plastic buckling and postbuckling behaviour of columns and plates, taking into account the presence of initial out-of-plane imperfections. The FE programs constructed by the author for this purpose are used to analyze the imperfection growth of such columns and plates under axial loading and simply supported edge conditions. The material behaviour is modeled according to both the incremental and the deformation theories of strain-hardening plasticity. The programs combine both the geometric and material nonlinearities to trace the load-deflection behaviours of these structures in prebuckling (up to the maximum load) as well as postbuckling ranges. The results of the analyses for plates show the extreme sensitivity of the incremental theory, and the relative insensitivity of the deformation theory, to the initial imperfections.
The programs are used to simulate the plastic buckling experiments on Aluminum tubes, taking into account their measured imperfections. The imperfection growth analyses demonstrate that the maximum load predictions of the incremental theory are quite close to those recorded in the experiments.
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Soroori, Rad Behrooz H. "Experiments on Cold-Formed Steel Beams with Holes." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42698.

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Experimental testing and elastic buckling studies were performed on 68 C-section cold-formed steel joists with unstiffened rectangular web holes. Four Steel Stud Manufacturers Association (SSMA) cross-section types; 800S200-33, 800S200-43, 1000S162-54, and 1200S162-97, were evaluated to explore the influence of holes on local, distortional, and global bucking failure modes. Hole depth was varied in the tests to identify trends in ultimate strength. Ultimate strength was observed to decrease with increasing hole depth for 800S200-33, 1200S162-97 cross-sections. Due to small number of specimen and unidentified behavior of the beams, a more in depth study of the behavior of 800S200-43 and 1000S162-54 beams are necessary. Local buckling of the unstiffened strip above the hole was observed to accompany distortional buckling at the hole for the locally slender 800S200-33 and 1000S162-54 cross-sections. Thin shell finite element eigen-buckling analysis of each joist specimen, including measured cross-section dimensions and tested boundary and loading conditions, were conducted in parallel with the experiments to identify those elastic buckling mode shapes which influence load-deformation response. The distortional and lateral-torsional buckling moments were observed to decrease with increasing hole depth while a contrasting behavior was captured for local buckling modes. A modification to the AISI Direct Strength Method equations for beams with slotted web-holes was compared against the experimental results with predictions lower than tested strength. Initial cross-section imperfections led to inclined webs which decreased the capacity of the beams. The use of a water-jet cutting process was employed successfully to produce accurate holes sizes and locations in each joist specimen and is recommended for researchers and manufacturers as a method for custom fabrication of cold-formed steel members.
Master of Science
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3

Haidar, Mohamed. "Modelling of failure mechanisms for corrugated board." Thesis, KTH, Hållfasthetslära (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176010.

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The present work describes the construction of a semi-analytical model for prediction of buckling loads in simply supported corrugated paperboard panels. The model accounts for transverse shear, due to the weakness of the core in such plates compared to the facings. This was done utilizing energy relations and rst order transverse shear. The panel was homogenised using laminate theory. A detailed model using FEM was derived in order to validate the predictive capabilities of the analytical model. Experimental testing was performed to estimate the accuracy of both theoretical models, and assess the limitation of the analytical model. All modes of analysis showed good agreement for cubic boxes. Further investigation into expanding the scope of the analytical model was carried out and commented on.
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4

Barbarella, Elena. "Towards the localization and characterization of defects based on the Modified error in Constitutive Relation : focus on the buckling test and comparison with other type of experiments." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN066/document.

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Des nombreuses industries composites cherchent à étendre le champ d'application des composites structuraux à fibres continues pour d'autre marché que l'aéronautique. Être compétitif sur ces marchés potentiels, tel l'automobile, implique de se conformer à des contraintes différentes; de coût, de temps de mise en œuvre, de trace écologique. Dans ce cadre les résines thermodurcissables sont remplacées par des résines thermoplastiques permettant des temps de cycle cours. Ces temps de cycle cours favorisent l'apparition de défauts potentiellement important et une question récurrente dans ce cadre est: Comment traiter des défauts? Un des aspects de cette question est celui de la détection et de la caractérisation des défauts. L'approche actuelle est celle des techniques non destructives. Celles ci sont longues, coûteuses et complexes et apparaissent donc mal adaptées aux contraintes de coûts et de temps caractéristique de la plupart des produits grands diffusions. Ce problème a motivé ce travail de thèse: est-il possible de détecter et d'estimer l'effet des défauts sans avoir recours à des techniques d'essais non destructifs complexes et coûteuses? Une réponse acceptable pourrait conduire à moins de précision, mais devrait fournir des informations quantitatives suffisantes pour les applications. La voie étudiée dans cette thèse est celle de l'exploitation par approches inverse d'essais mécaniques statiques suivis par mesure de champs par corrélation d'images numériques. Seuls la localisation et la caractérisation de grands défauts est visée. Des essais de flambement ont été choisis en raison de leur sensibilité supposée aux défauts. Parmi les approches inverses, nous nous sommes concentrés sur la méthode de l'erreur en relation de comportement modifiée (MCRE). En effet cette méthode a, par le passé, montrée de très bonnes propriétés de localisation dans le cas d'essais de vibrations couvrant plusieurs fréquences propres. En vue d'obtenir une formulation simple et rapide nous avons privilégié une exploitation approchée des essais par l'intermédiaire d'une approche linéarisée du flambage. Une extension de la MCRE dans ce cadre a été proposée. Cette formulation pose, notamment la difficulté de traiter des résultats expérimentaux qui se présentent non pas sous la forme d'une réponse de flambage pure mais, en raison des défauts géométriques, d'une réponse non-linéaire dés le début des essais. Pour essayer de contourner cette difficulté une exploitation des essais au moyen du diagramme de Southwell a été utilisée. Elle permet, au moins pour des éprouvettes élancées, de déterminer la charge critique théorique d'une éprouvette sans défauts géométriques mais avec défauts matériels. La stéréo corrélation d'images numériques (StereoDIC) est exploitée pour reconstruire la déformée la forme de l'échantillon pendant le test. Les intérêts et les limites de la méthodologie sont discutés sur la base d'essais numériques et l'essai flambage est comparé aux essais de traction, flexion ou de vibration. Il est montré que l'exploitation d'essais de flambage par l'approche proposée est efficace au moins dans le cas d'imperfections géométriques modérées. Finalement la méthode est exploitée dans le cas d'essais expérimentaux à la fois pour un spécimen presque parfait et pour une pièce défectueuse, où une zone d'ondulation de la fibre est introduite. Les résultats obtenus sont encourageants
Composite materials are nowadays extending their operational field to industrial applications other than aeronautics. New potential markets, such as automotive, imply the need to comply with different constraints; reduced cost and production time become more binding, taking the lead over the complete absence of defects. The drawback to fast automatized procedure is the higher defectiveness of the components produced, a deeper control of the part is therefore needed. Non-destructive techniques are expensive both in terms of cost and time and therefore the main question we tried to answer in this thesis is: is it possible to detect and estimate the effect of defects without resorting to the complex and time-consuming NDT techniques? An acceptable answer may potentially lead to a lower precision but should guarantee sufficient quantitative information for these applications. The thesis aims at exploring possibilities to use classical mechanical test combined with Digital Image correlation and inverse procedure to localize and characterized possible (large) defects. Buckling tests have been chosen at first due their supposed sensitivity to defects. Among the possible inverse technique, we have chosen to extend the so-called Modified Error in Constitutive Relation to the case of buckling because, in the case of vibration tests performed with several frequencies, the MCRE proved to have very good localization properties. The dedicated formulation of the MCRE for linearized buckling requires a post-processing of the non-linear experimental results. The Southwell plot is here employed to reconstruct the eigenvalue, the critical load, of the equivalent eigenvalue problem (i.e. the solution of the problem with material defect and no geometrical ones) and the Stereo Digital Image Correlation (StereoDIC) is exploited to reconstruct the deformed shape of the specimen during the test, used as mode. The interests and limits of the methodology are discussed notably through the comparison of numerical results using the MCRE in case of traction, flexion or vibration tests. It is shown that the linearized buckling based MCRE technique proves well for pseudo-experimental measurements at least for moderate geometrical imperfections. In addition first experiments have been performed; the defects are characterized from real experimental specimens, both for a nominally perfect specimen and for a defective one, where a zone of fibre waviness is induced. Stereo Digital Image Correlation (StereoDIC) is exploited to reconstruct the deformed shape of the specimen during the test, this shape being used as an approximation of the buckling mode. While on the first one no defects are detected, on the flawed specimen the localized area is in reasonable agreement with the area affected by fibre undulations
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5

Li, Hong. "Experimental micromechanics of composite buckling strength." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.

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6

Schleyer, Graham Klaus. "Buckling of tank roofs : a buckling analysis and experimental investigation of storage tank domed roofs." Thesis, University of Strathclyde, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362804.

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7

Eryasar, Mehmet Emrah. "Experimental And Numerical Investigation Of Buckling Restrained Braces." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610364/index.pdf.

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A typical buckling restrained brace (BRB) consists of a core segment and a buckling restraining mechanism. When compared to a conventional brace, BRBs provide nearly equal axial yield force in tension and compression. Buckling restraining mechanism can be grouped into two main categories. Buckling is inhibited either by using a concrete or mortar filled steel tube or by using steel sections only. While a large body of knowledge exists on buckling restrained braces the behavior of steel encased BRBs has not been studied in detail. Another area that needs further investigation is the detailing of the deboding material. For all types of BRBs a debonding material or a gap has to be utilized between the core brace and the restraining mechanism. The main function of the debonding material is to eliminate the transfer of shear force between the core brace and the restraining mechanism by preventing or reducing the friction. A two phase research study has been undertaken to address these research needs. In the first phase an experimental study was carried out to investigate the potential of using steel encased BRBs. In the second phase a numerical study was conducted to study the friction problem in BRBs. The experimental study revealed that steel encased braces provide stable hysteretic behavior and can be an alternative to mortar filled steel tubes. Material and geometric properties of the debonding layer for desired axial load behavior were identified and presented herein.
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Rastgar, Agah Mobin. "Material Characterization of Aortic Tissue for Traumatic Injury and Buckling." Diss., Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/324268.

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Mechanical Engineering
Ph.D.
While traumatic aortic injury (TAI) and rupture (TAR) continue to be a major cause of morbidity and mortality in motor vehicle accidents, its underlying mechanisms are still not well understood. Different mechanisms such as increase in intraluminal pressure, relative movement of aorta with respect to mediastinal structures, direct impact to bony structures have been proposed as contributing factors to TAI/TAR. At the tissue level, TAI is assumed to be the result of a complex state of supra-physiological, high rate, and multi-axial loading. A major step to gain insight into the mechanisms of TAI is a characterization of the aortic tissue mechanical and failure properties under loading conditions that resemble traumatic events. While the mechanical behavior of arteries in physiological conditions have been investigated by many researchers, this dissertation was motivated by the scarcity of reported data on supra-physiological and high rate loading conditions of aorta. Material properties of the porcine aortic tissue were characterized and a Fung-type constitutive model was developed based on ex-vivo inflation-extension of aortic segments with intraluminal pressures covering a range from physiological to supra-physiological (70 kPa). The convexity of the material constitutive model was preserved to ensure numerical stability. The increase in ë_è from physiological pressure (13 kPa) to 70 kPa was 13% at the outer wall and 22% at the inner wall while in this pressure range, the longitudinal stretch ratio ë_z increased 20%. A significant nonlinearity in the material behavior was observed as in the same pressure range, the circumferential and longitudinal Cauchy stresses at the inner wall were increased 16 and 18 times respectively. The effect of strain-rate on the mechanical behavior and failure properties of the tissue was characterized using uniaxial extension experiments in circumferential and longitudinal directions at nominal strain rates of 0.3, 3, 30 and 400 s-1. Two distinct states of failure initiation (FI) and ultimate tensile strength (UTS) were identified at both directions. Explicit direct relationships were derived between FI and UTS stresses and strain rate. On the other hand, FI and UTS strains were rate independent and therefore strain was proposed as the main mechanism of failure. On average, engineering strain at FI was 0.85±0.03 for circumferential direction and 0.58±0.02 for longitudinal direction. The engineering strain at UTS was not different between the two directions and reached 0.89±0.03 on average. Tissue pre-failure linear moduli showed an average of 60% increase over the range of strain rates. Using the developed material model, mechanical stability of aorta was studied by varying the loading parameters for two boundary conditions, namely pinned-pinned boundary condition (PPBC) and clamped-clamped boundary condition (CCBC). The critical pressure for CCBC was three times higher than PPBC. It was shown that the relatively free segment of aorta at the isthmus region may become unstable before reaching the peak intraluminal pressures that occur during a trauma. The mechanical instability mechanism was proposed as a contributing factor to TAI, where elevations in tissue stresses and strains due to buckling may increase the risk of injury.
Temple University--Theses
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9

Markiz, Nizar. "Experimental Investigation of Lateral Torsional Buckling of Gerber Frames." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20051.

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The objective of this thesis is to investigate the elastic lateral buckling resistance of Gerber frames based on full scale tests and finite element analyses. Three experiments were undertaken to obtain elastic buckling loads and the buckling modes were recorded. Shell finite element solutions were conducted to predict the elastic lateral buckling resistance of the frames tested. A comparison between the elastic buckling loads obtained from full scale experiments and those predicted by the FEA models provides an assessment of the ability of the finite element analysis model in predicting elastic lateral resistance and buckled mode shapes of Gerber frames. Conclusions and recommendations for future research are provided.
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Berrada, Kamal. "An experimental investigation of the plastic buckling of aluminum plates /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63160.

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Книги з теми "Buckling experiments"

1

Johann, Arbocz, and Weller T, eds. Buckling experiments: Experimental methods in buckling of thin-walled structures. Chichester: Wiley, 1998.

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2

G, Falzon B., and Aliabadi M. H, eds. Buckling and post buckling structures: Experimental, analytical and numerical studies. London: Imperial College Press, 2008.

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3

1928-, Florence Alexander L., ed. Dynamic pulse buckling: Theory and experiment. Dordrecht: M. Nijhoff, 1987.

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4

Lindberg, Herbert E. Dynamic Pulse Buckling: Theory and Experiment. Dordrecht: Springer Netherlands, 1987.

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5

1923-, Singer Josef, and Elishakoff Isaac, eds. Buckling of structures: Theory and experiment : the Josef Singer anniversary volume. Amsterdam: Elsevier, 1988.

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6

Pegg, Neil G. Experimental determination of interframe buckling of a ring stiffened cylinder. Dartmouth, N.S: Defence Research Establishment Atlantic, 1989.

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7

Gur, J. Ari. Experimental studies with metal plates subjected to inplane axial impact. Haifa: Technion Israel Institute of Technology, 1985.

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8

W, Hyer M., Starnes James H, and United States. National Aeronautics and Space Administration., eds. Numerical and experimental investigation of the bending response of thin-walled composite cylinders. Blacksburg, Va: College of Engineering, Virginia Polytechnic Institute and State University, 1993.

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9

Facility, Dryden Flight Research, ed. A comparison of experimental and calculated thin-shell leading-edge buckling due to thermal stress. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1988.

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10

Facility, Dryden Flight Research, ed. A comparison of experimental and calculated thin-shell leading-edge buckling due to thermal stress. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1988.

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Частини книг з теми "Buckling experiments"

1

Martin, Katharina, Dennis Daub, Burkard Esser, Ali Gülhan, and Stefanie Reese. "Numerical Modelling of Fluid-Structure Interaction for Thermal Buckling in Hypersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 341–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_22.

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Abstract Experiments have shown that a high-enthalpy flow field might lead under certain mechanical constraints to buckling effects and plastic deformation. The panel buckling into the flow changes the flow field causing locally increased heating which in turn affects the panel deformation. The temperature increase due to aerothermal heating in the hypersonic flow causes the metallic panel to buckle into the flow. To investigate these phenomena numerically, a thermomechanical simulation of a fluid-structure interaction (FSI) model for thermal buckling is presented. The FSI simulation is set up in a staggered scheme and split into a thermal solid, a mechanical solid and a fluid computation. The structural solver Abaqus and the fluid solver TAU from the German Aerospace Center (DLR) are coupled within the FSI code ifls developed at the Institute of Aircraft Design and Lightweight Structures (IFL) at TU Braunschweig. The FSI setup focuses on the choice of an equilibrium iteration method, the time integration and the data transfer between grids. To model the complex material behaviour of the structure, a viscoplastic material model with linear isotropic hardening and thermal expansion including material parameters, which are nonlinearly dependent on temperature, is used.
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2

Parlapalli, Madusudhanan R., Kwok C. Soh, and Dong Wei Shu. "Delamination Buckling of Kevlar and Twaron Stitched Glass\Epoxy Composite Laminates by Experiments." In Solid State Phenomena, 109–14. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-50-7.109.

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Yarin, A. L. "Bending and Buckling Instabilities of Free Liquid Jets: Experiments and General Quasi-One-Dimensional Model." In Handbook of Atomization and Sprays, 55–73. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-7264-4_2.

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4

Chrysanidis, Theodoros, and Vassilis Panoskaltsis. "Numerical Study of the Tensile Experiments Modelling the Elongation Degree of Highly-Reinforced Extreme Edges of Seismic Walls for Studying the Transverse Buckling Phenomenon." In Lecture Notes in Civil Engineering, 119–30. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6932-3_11.

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Lee, Seung Sik, Soon Jong Yoon, and Sung Yong Back. "Buckling of Composite Thin-Walled Members." In Experimental Mechanics in Nano and Biotechnology, 1733–36. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1733.

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6

Wang, Hongtao, and James G. A. Croll. "Buckling Design Optimisation of Fibre Reinforced Polymer Shells Using Lower Bound Post-Buckling Capacities." In Experimental Analysis of Nano and Engineering Materials and Structures, 787–88. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_391.

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Rothe, Jörg, and Lena Schend. "Control Complexity in Bucklin, Fallback, and Plurality Voting: An Experimental Approach." In Experimental Algorithms, 356–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30850-5_31.

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Liu, Cai Hua, Z. H. Ye, Cong Xin Chen, Xia Ting Feng, Q. Shen, and G. F. Xiao. "Mechanical Analysis of Buckling Failure of Bedding Rock Slopes." In Experimental Mechanics in Nano and Biotechnology, 1125–28. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1125.

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Waeckel, Nicolas, Jean-François Jullien, and Alain Kabore. "Buckling of Axially Compressed Imperfect Cylinders and Ring Stiffened Cylinders Under External Pressure." In Experimental Stress Analysis, 123–32. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4416-9_14.

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Capozucca, R., E. Magagnini, and M. V. Vecchietti. "Delamination Buckling of FRP: Experimental Tests and Theoretical Model." In Lecture Notes in Mechanical Engineering, 753–66. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8331-1_59.

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Тези доповідей конференцій з теми "Buckling experiments"

1

Jacquet, Nicolas, Nicolas Tardif, Thomas Elguedj, and Christophe Garnier. "Elasto-Visco-Plastic Buckling of Thick Anisotropic Shells: Numerical Buckling Predictions and Experiments." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21491.

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Abstract This work is focused on elasto-visco-plastic (EVP) buckling of thick shell structures. In particular we are interested in predicting accurately the buckling risk of stainless steel components of nuclear fast sodium reactor working under high pressure and at high temperature (around 180 bar and 500 °C). We follow a modeling/experimental approach to solve this problem. The set-up of relevant experiments at such high temperature being complex, we work with a representative material that shows similar EVP and buckling behavior at room temperature. The representative material is an alloy mostly composed of tin, silver and copper, commonly named Sn 3.0 Ag 0.5 Cu. The elasto-visco-plastic constitutive model of the material was first characterized using tensile tests on notched specimen at room temperature under various strain rates, and the model parameters identified using finite element model updating (FEMU). In a second step we performed in plane compressive buckling tests of thick plates for various displacement rates. Surface 3D displacements were acquired using three cameras and digital image correlation. It is well known for thick plates that linearized tangent moduli derived from Levy-Mises flow theory does not give accurate elasto-plastic buckling prediction. Linearized tangent moduli derived from Hencky’s deformation theory gives more accurate buckling prediction for thick plates. This numerical phenomenon known as buckling paradox was well correlated to experiments in the literature. This paradox is applied here to thick plates, with EVP constitutive model, in order to predict buckling. Finally, finite element (FE) modeling of the buckling experiments was performed. Plates are modeled using SHB8PS solid shell elements. Solid shell elements allow direct displacement correlation with experiments and accurate through the thickness behavior with a 3D material model. The numerical modeling includes real plate geometry obtained using post machining measurements, experimental boundary conditions derived from the DIC (Digital Image Correlation) results and the previously identified constitutive material law. Buckling risk is tested at each loading step of the incremental algorithm using the tangent operator derived with the Hencky’s deformation theory. Numerical results show a very good correlation with the experimental results on load and displacement history as well as buckling critical load and buckling mode.
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Poelma, R. H., H. Sadeghian, Sau Koh, and G. Q. Zhang. "Buckling analysis of carbon nanotubes and the influence of defect position." In Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2011. http://dx.doi.org/10.1109/esime.2011.5765864.

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Bartram, Gregory W., Ricardo A. Perez, Richard Wiebe, and Benjamin P. Smarslok. "Uncertainty Quantification of State Boundaries in Thin Beam Buckling Experiments." In 17th AIAA Non-Deterministic Approaches Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-1819.

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4

Tsumoto, Koji, Hiroshi Yabuno, and Nobuharu Aoshima. "Stabilization of a Buckled Beam by High-Frequency Excitation: Linear Analysis and Experiments." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84947.

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Beam is one of the fundamental elements in complex structures. It is very significant to clarify its stability under the various circumstances. In particular, the buckling phenomenon, which is characterized as a pitchfork bifurcation, has accepted much interest by many researchers. In this paper, we propose a stabilization control method for the first-mode buckling phenomenon in the clamped-clamped beam without feedback control. We analyze the stability of a buckled beam under high frequency excitation in linear theory. It is theoretically clarified and experimentally that the high-frequency excitation shifts the bifurcation point (the critical compressive force) and prevents the beam buckling.
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5

Cheng, Hang Shawn, Jian Cao, and Hui-Ping Wang. "Experimental and Numerical Analysis of the Buckling and Post-Buckling Phenomenon in the Yoshida Test." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21029.

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Simulation-based Design and Manufacturing has shown its great effectiveness in shortening the design cycle. The objective of this work was to further increase the robustness of numerical prediction in capturing subtle wrinkling in sheet metal forming process. A stress-based wrinkling predictor is further developed to predict the initiation and wave mode of potential wrinkling in forming of flat sheet. The predictor is linked to the LS-DYNA commercial FEM package. Stress prediction from LS-DYNA was compared to the implicit code ABAQUS and satisfactory results were obtained. Hence, stress, nodal coordinates and connectivity information of the LS-DYNA simulation are fed into the predictor via an automatic interface program. A set of Yoshida buckling tests was used as a verification tool for the wrinkling predictor. 0.78mm thick 180B steel and 1.012mm thick 6111-T4P aluminum are tested. Through the comparison of the experiments and simulations, it shows that the wrinkling predictor is able to predict the initiation point and wave mode for the wrinkling accurately. In addition, post-buckling behavior in numerical simulations was captured through including initial imperfections following the wrinkling mode predicted. It was found that such a method provides more reliable results in terms of the post-buckling behavior than random imperfection.
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6

Chen, Y., R. A. Zimmer, J. G. de Oliveira, and H. Y. Jan. "Buckling and Ultimate Strength of Stiffene~ Cylinders: Model Experiments and Strength Formulations." In Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/4853-ms.

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7

Jo, Byeongnam, Koji Okamoto, and Naoto Kasahara. "Creep Buckling and Post Buckling Behaviors of Stainless Steel Tube Columns Under External Pressure at Extremely High Temperatures." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63226.

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Creep buckling failure of a stainless steel tube column was investigated at three temperature conditions (800, 900, and 1000 °C). 304 grade stainless steel was used as a test material in this study. In creep tests, external pressure was increased to a target value, temperature of the tube column was quickly increased to a target temperature, and failure time was measured maintaining the pressure and the temperature. Based on the experimental results of the creep buckling failure time, an empirical correlation was developed by the Larson-Miller parameter. Moreover, post buckling experiments were performed to examine buckling-induced boundary failure at extremely high temperature more than 1300 °C. Additional heating was applied to the specimen which already buckled by external pressure. In the additional heating tests, temperature was increased until boundary failure was formed on the surface of the tube columns. The results showed that the creep buckling failure time was shorter than those in other tensile stress-induced creep tests. The empirical correlation obtained by Larson-Miller parameter predicts well the creep buckling failure time. Finally, boundary failure was obtained in the post buckling under the additional heating.
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Fatemi, Ali, Shawn Kenny, Millan Sen, Joe Zhou, Farid Taheri, and Michael Paulin. "Investigations on the Local Buckling Response of High Strength Linepipe." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64407.

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A numerical modeling procedure was developed, using the finite-element simulator ABAQUS/Standard, to predict the local buckling and post-buckling response of high strength pipelines subject to combined state of loading. The numerical procedures were calibrated using test data from large-scale experiments examining the local buckling of high strength linepipe. The numerical model’s response was consistent with the measured experimental response for predicting the local buckling behavior well into the post-yield range. A parametric study was conducted that examined element selection, mesh topology, second-order effects, geometric imperfections and material properties. The results from this study are presented.
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9

Deng, Shiguang, and Krishnan Suresh. "Topology Optimization Under Linear Thermo-Elastic Buckling." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59408.

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This paper focuses on topology optimization of structures subject to a compressive load in a thermal environment. Such problems are important, for example, in aerospace, where structures are prone to thermally induced buckling. Popular strategies for thermo-elastic topology optimization include Solid Isotropic Material with Penalization (SIMP) and Rational Approximation of Material Properties (RAMP). However, since both methods fundamentally rely on material parameterization, they are often challenged by: (1) pseudo buckling modes in low-density regions, and (2) ill-conditioned stiffness matrices. To overcome these, we consider here an alternate level-set approach that relies discrete topological sensitivity. Buckling sensitivity analysis is carried out via direct and adjoint formulations. Augmented Lagrangian method is then used to solve a buckling constrained compliance minimization problem. Finally, 3D numerical experiments illustrate the efficiency of the proposed method.
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10

Larson, Reid A., and George Bibel. "Experimental and Analytical Evaluation of Buckling Forces of a Spiral Wound Flexible Gasket." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71401.

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Inward buckling forces of spiral wound flexible gaskets is studied experimentally and analytically using the finite element method. A series of experiments was conducted utilizing an NPS 16 Class 300 weld-neck pipe and flange conforming to specification ASME B16.5. Strain gauges were mounted on the inner and outer metallic rings of the spiral wound sealing gasket and strain data was recorded during initial bolt pre-loading. Using this particular experiment as a pattern, a finite element model was developed to simulate the flange, bolt, and nonlinear gasket response under identical loading conditions. The computer-generated solid model consists of a quarter-symmetry, three-dimensional assembly constructed to the specifications of the pipe, flange, bolts, and gaskets used in the hardware trials. The finite element model was loaded to simulate the initial bolt pre-loading through the same range as in the original experiment. Solutions obtained from the finite element model are compared with the experimental results, and conclusions are drawn.
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Звіти організацій з теми "Buckling experiments"

1

Purasinghe, Rupasiri. Experimental determination of post-buckling performance of steel angles. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3156.

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HUYNH, Le Anh Thi, Cao Hung PHAM, and Kim J. R. RASMUSSEN. EXPERIMENTAL INVESTIGATION OF COLD-ROLLED ALUMINIUM ALLOY 5052-H36 BEAMS UNDERGOING LOCAL BUCKLING. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.118.

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3

Pham, Ngoc Hieu, Cao Hung Pham, and Kim J. R. Rasmussen. EXPERIMENTAL INVESTIGATION OF THE MEMBER BUCKLING OF COLD-ROLLED ALUMINIUM ALLOY 5052 CHANNEL COLUMNS. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.111.

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4

Hoffman, E. L., and D. J. Ammerman. Dynamic pulse buckling of cylindrical shells under axial impact: A comparison of 2D and 3D finite element calculations with experimental data. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/90744.

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EXPERIMENTAL BEHAVIOR AND DESIGN OF RECTANGULAR CONCRETE-FILLED TUBULAR BUCKLING-RESTRAINED BRACES. The Hong Kong Institute of Steel Construction, December 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.5.

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This paper proposes a new design method for concrete-filled tubular buckling-restrained braces (CFT-BRBs) by incorporating the confinement effect on pre-buckling rigidity. A series of experiments are performed to investigate the effects of concrete strength and sectional dimension on the initial stiffness, ultimate strength, and energy dissipation behaviors. Experimental results indicate that the confined concrete plays an important role in the energy dissipating capacity of CFT-BRBs. On the other hand, the sectional dimensions of the steel tube and core are influential factors governing the ultimate failure modes of CFT-BRBs. The findings in study provide technical supports to optimize the design methods for ductile seismic performance of CFT-BRBs in low-rise and high-rise steel buildings.
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6

MECHANICAL BEHAVIOR AND CATENARY ACTION OF RESTRAINED STEEL BEAM UNDER FIRE. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.8.

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To investigate the mechanical behavior and catenary action of restrained steel beam under fire, experiments were performed on five H-section restrained steel beams exposed to ISO-834 standard fire. At first, mechanical property tensile tests were performed on 3 room-temperature specimens and 8 high-temperature specimens, and variation laws of the material properties of steel materials with temperature rising were investigated by the high-temperature steady-state tests. Through the fire experiments, the temperature data, mid-span deflections and failure modes of all specimens were obtained. The experimental results show that: (1) a restrained steel beam is prone to in-plane buckling failure under fire; (2) the loading ratio n and axial restraint stiffness Kx have great influences on the catenary action of restrained steel beam under fire; (3) when the loading ratio n is constant, the greater the axial restraint stiffness Kx, the later the catenary action occurs; when the axial restraint stiffness Kx is constant, the greater the loading ratio n, the earlier the catenary action occurs.
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7

BUCKLING BEHAVIOR OF A WHEEL COUPLER HIGH-FORMWORK SUPPORT SYSTEM BASED ON SEMI-RIGID CONNECTION JOINTS. The Hong Kong Institute of Steel Construction, March 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.1.

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To clarify the buckling behavior of a wheel coupler high-formwork support system with a diagonal bracing, the positive and negative bending behaviors of the connection joints of the support were systematically studied through experiments. Through a parametric analysis and a finite element analysis, a precise numerical model of the connection joints of the wheel coupler was established and verified. Based on the characteristics of the semi-rigid connections, the buckling behavior of the overall structure was analyzed. The results showed that the failure modes in the positive direction were correlated with the insertion depth of the socket into the template; the greater the depth, the more likely the socket was to fracture. The failure modes in the negative direction were closely related to the insertion depth and the bending of the vertical post. An appropriate joint density was conducive to the overall stability. In the presence of a lateral constraint at the top, the greater the angle between the diagonal bracing and the horizontal plane, the better the overall stability under the same joint density. The optimal layout of the vertical diagonal bracing was a 2-span, 4-step arrangement, and the optimal angle was in the range of 30–70°. In the absence of a lateral constraint at the top, the smaller the angle between the diagonal bracing and the horizontal plane, the better the overall stability under the same joint density. The optimal angle was approximately 30° when the lift height was moderate.
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EXPERIMENTAL STUDY ON INTERACTION OF DISTORTIONAL AND GLOBAL BUCKLING OF STAINLESS STEEL LIPPED CHANNEL COLUMNS. The Hong Kong Institute of Steel Construction, June 2023. http://dx.doi.org/10.18057/ijasc.2023.19.2.7.

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This paper presents an experimental program to investigate distortional and global interaction buckling of stainless steel lipped channel columns in compression. Appropriate cross-sections and lengths were chosen so as to observe distortional-overall interaction buckling. In total, 21 buckling tests were conducted. After a brief introduction to the choice of column specimen geometries, key experimental results have been presented and discussed. The tests aim to study and observe the effect of distortional-global interactive buckling, study member under pin-ended boundary conditions, and provide benchmarks for design. Column tests were carried out with 13 position transducers monitoring displacements at key locations. A 3-D laser scanner was used to measure the imperfection shapes and magnitudes of the columns before testing. Material tests have been performed to determine the mechanical properties of stainless steel. Distortional–global interactive buckling of all columns is shown to be a failure mode. The experimental results are also used to evaluate the Australian Standard AS/NZS, North American Specification AISI, as well as formulation proposed by Becque and Rasmussen’s predictions, indicated that the Direct Strength Method (DSM) as described in AISI and AS/NZS for members undergoing distortional-overall interaction buckling are unconservative. Becque and Rasmussen’s curve is much closer to the test points than DSM in AISI and AS/NZS.
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HYSTERETIC PERFORMANCE OF WEAK-AXIS CONNECTION WITH I-SHAPED PLATES IN STEEL FRAME. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.1.

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This paper elucidates numerically the behavior of weak-axis moment connections proposed by welding I-shaped plates in the H-section column to increase connection strength and ductility in steel frame. After validating the numerical methods through comparing the results of numerical analysis and experiments, the effectiveness of the proposed weak-axis connection were examined through comparing to the traditional weak-axis connection. The proposed weak-axis connection could move the highest stresses away from the start-stop points of a weld, and thus preventing the premature brittle fracture of the beam flange welds. The plastic hinge formed away from the beam-column interface, while the local buckling occurred in the weld access holes region in the traditional weak-axis connection. The proposed weak-axis connections can be classified as rigid in a strong-bracing system, and be classified as semi-rigid in weak-supported or unsupported system. And then a series of parametric studies was conducted to better understand the behavior of proposed weak-axis moment connections. The force-displacement relationships, location of the plastic hinge, Mises index (MI), triaxiality index (TI) and rupture index (RI) distributions at the beam flange welds were reported in detail. According to the numerical analysis, the design variables of I-shaped plates and widened flange plate are suggested, along with a design procedure.
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EXPERIMENTAL STUDY ON BEHAVIOR OF THE GUSSET-PLATE JOINT OF ALUMINUM ALLOY PORTAL FRAME. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.257.

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"The aluminum alloy portal frames are increasingly being used for lightweight building construction. This paper investigated the flexural behavior of the bolted gusset-plate joint applied in the beam-beam connection of aluminum alloy portal frames. Bending tests were conducted on 3 aluminum alloy bolted gusset-plate joints. The failure phenomenon indicated that the thin plate joint failed by the buckling of gusset plates, while the thick plate joint failed by the buckling of sleeves. The momentrotation curves showed that thickening the gusset plate can effectively prevent the buckling of gusset plates and increase the flexural capacity and bending stiffness of joints. In addition, the longitudinal spacing of bolts has a significant influence on the joint stiffness but has no obvious influence on the bearing capacity of the joint. The stress on the two gusset plates of the joint was uneven, which led to the decline of bearing performance of thin plate joints."
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