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Journal articles on the topic 'Buckling experiments'

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Author: Grafiati

Published: 14 March 2023

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1

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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4

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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11

Singer, Josef. "On the Importance of Shell Buckling Experiments." Applied Mechanics Reviews 52, no. 6 (June 1, 1999): R17—R25. http://dx.doi.org/10.1115/1.3098935.

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12

Zhao, Y., and J. G. Teng. "Buckling experiments on steel silo transition junctions." Journal of Constructional Steel Research 60, no. 12 (December 2004): 1783–801. http://dx.doi.org/10.1016/j.jcsr.2004.04.004.

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13

Zhao, Y., and J. G. Teng. "Buckling experiments on steel silo transition junctions." Journal of Constructional Steel Research 60, no. 12 (December 2004): 1803–23. http://dx.doi.org/10.1016/j.jcsr.2004.05.001.

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14

Wang, Chun Gang, Run Jia Liang, Lian Guang Jia, and Hong Liu. "Experiments on Cold-Formed Steel Lipped Channel Beams with Complex Edge Stiffeners and Web Holes." Advanced Materials Research 671-674 (March 2013): 461–64. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.461.

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This paper presents an experimental investigation and a numerical analysis on the bending strength and behavior of cold-formed steel C-section and ∑-section beams with complex edge stiffeners and web holes. Local buckling, distortional buckling and interaction between local and distortional buckling were observed in the tests. The experimental results show that the stiffened web has great influence on member's bending strength. Compared with C-section specimens, the stiffness of the web stiffeners of ∑-section specimens reduced the influence of the holes. The finite element analysis results show good agreement with the experimental results in terms of bending strength and buckling mode.

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15

Butler, R., M. Lillico, G. W. Hunt, and N. J. McDonald. "Experiments on interactive buckling in optimized stiffened panels." Structural and Multidisciplinary Optimization 23, no. 1 (December 1, 2001): 40–48. http://dx.doi.org/10.1007/s00158-001-0164-0.

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16

Parlapalli, Madusudhanan R., Kwok C. Soh, and Dong Wei Shu. "Delamination Buckling of Kevlar and Twaron Stitched Glass\Epoxy Composite Laminates by Experiments." Solid State Phenomena 136 (February 2008): 109–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.136.109.

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In the present paper, effects of through-the-thickness stitching of delaminated glass/epoxy composite laminates with two different types of aramid threads, Kevlar® and Twaron® threads, on the buckling loads are studied. The buckling loads are predicted based on the Southwell, Vertical displacement and Membrane strain plot methods from the experimental data. Flexural modulus of the stitched and unstitched glass/epoxy composite laminates, knot tensile strength of Kevlar® and Twaron® stitching threads are obtained experimentally. From the Southwell, Vertical displacement and Membrane strain plot methods it is observed that stitching either by Kevlar® or Twaron® threads is effective in improving the buckling strength of glass/epoxy composite laminates when the delamination length is greater than 0.5L, L is the length of the laminate.

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17

Liu, W. K., Y. J. Chen, K. Tsukimori, and R. A. Uras. "Recent Advances in Dynamic Buckling Analysis of Liquid-Filled Shells." Journal of Pressure Vessel Technology 113, no. 2 (May 1, 1991): 314–20. http://dx.doi.org/10.1115/1.2928760.

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The dynamic buckling of liquid-filled shells is reviewed. Comparison of the analysis with experimental results is presented. The governing equations of dynamic buckling of liquid-filled imperfect shells are then derived. A simple imperfection pattern is chosen to explain the additional buckling modes encountered in the experiments.

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18

Marshall, J. G., and A. Moshaiov. "A Study on Delaminated Cylinders Subjected to Hydrostatic Pressure." Journal of Ship Research 34, no. 02 (June 1, 1990): 136–41. http://dx.doi.org/10.5957/jsr.1990.34.2.136.

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In the maritime field composite materials offer several advantages over conventional metallic substances, especially for the construction of deep diving vessels. Such vessels, however, may suffer reduced buckling strength whenever structural defects such as delamination exist. An experimental study has been carried out to explore the delamination buckling in composite cylinders subjected to hydrostatic pressure. The experiments consist of a series of tests on chopped strand glass fiber cylinders. The buckling pressures are obtained for varying delamination sizes and positions. The results of the experiments are shown to follow the theoretically predicted trends.

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19

Kanj, Ali, Paolo F. Ferrari, Arend M. van der Zande, Alexander F. Vakakis, and Sameh Tawfick. "Strongly tunable nonlinear MEMS resonators by electro-thermoelastic buckling." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A38. http://dx.doi.org/10.1121/10.0015462.

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This talk presents the benefit of buckling in strongly tuning nonlinear MEMS resonators. In particular, the talk shows experimental buckling achieving more than 230% tuning in the natural frequency of drumhead MEMS resonators. Moreover, the experiments demonstrate that buckling switches the frequency response between purely stiffening, purely softening, and stiffening-to-softening nonlinearities. We tune the buckling state in these experiments by controlling the electric voltage and the temperature of the resonators. Therefore, these resonators undergo electrostatically-mediated thermoelastic buckling where specific combinations of temperature and voltage are required to access the distinct vibrational responses. We explain the observed linear and nonlinear responses by a reduced-order model (ROM) that lumps the resonator into a 1-degree-of-freedom mass connected to springs reflecting bending, stretching, electrostatic forces, thermal expansions, and residual stresses. The ROM mimics von Mises trusses to model the buckling in the membrane resonators without the need for exact geometry or structure to model the resonators. This developed ROM and the electro-thermoelastic buckling tunability present useful applications for on-chip acoustic devices in different fields such as signal manipulation, filtering, and MEMS waveguides.

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20

Stein-Montalvo, Lucia, Douglas P. Holmes, and Gwennou Coupier. "Delayed buckling of spherical shells due to viscoelastic knockdown of the critical load." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2253 (September 2021): 20210253. http://dx.doi.org/10.1098/rspa.2021.0253.

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We performed dynamic pressure buckling experiments on defect-seeded spherical shells made of a common silicone elastomer. Unlike in quasi-static experiments, shells buckled at ostensibly subcritical pressures, i.e. below the experimentally determined critical load at which buckling occurs elastically, often following a significant delay period from the time of load application. While emphasizing the close connections to elastic shell buckling, we rely on viscoelasticity to explain our observations. In particular, we demonstrate that the lower critical load may be determined from the material properties, which is rationalized by a simple analogy to elastic spherical shell buckling. We then introduce a model centred on empirical quantities to show that viscoelastic creep deformation lowers the critical load in the same predictable, quantifiable way that a growing defect would in an elastic shell. This allows us to capture how both the deflection at instability and the time delay depend on the applied pressure, material properties and defect geometry. These quantities are straightforward to measure in experiments. Thus, our work not only provides intuition for viscoelastic behaviour from an elastic shell buckling perspective but also offers an accessible pathway to introduce tunable, time-controlled actuation to existing mechanical actuators, e.g. pneumatic grippers.

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21

Zhang, Dongjian, Xitao Zheng, Chongzhe Wang, and Zhen Wu. "Experiments and Analysis on Stability of the Sandwich Structures with Soft Core." International Journal of Structural Stability and Dynamics 19, no. 12 (December 2019): 1950159. http://dx.doi.org/10.1142/s0219455419501591.

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In this paper, first a complete buckling experiment of the sandwich beams with the foam core is carried out, which includes the manufacturing of specimens and their experimental verification. Second, a refined sinusoidal zig-zag theory (RSZT) is established, which can describe the zig-zag effect during the in-plane compression of sandwich beam and accommodate the transverse shear free surface boundary conditions. Based on the established model combined with Hu–Washizu variational principle, a two-node beam element has been developed to address the buckling problem of the sandwich beams. Thus, the established beam element is able to accommodate interlaminar continuous conditions of transverse shear stress. Several examples have been investigated to validate the accuracy of the established method. The comparative analysis of the results including experimental data, the results acquired from three-dimensional finite element (3D-FEM) and diverse models has been made. Comparative analysis shows that the accurate buckling loads can be acquired from the established model. Nevertheless, other models discarding the continuous conditions of transverse stresses among the adjacent layers largely overestimate the critical loads.

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22

Mahendran, Mahen, and Philip Avery. "Buckling Experiments on Hollow Flange Beams with Web Stiffeners." Journal of Structural Engineering 123, no. 9 (September 1997): 1130–34. http://dx.doi.org/10.1061/(asce)0733-9445(1997)123:9(1130).

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23

Zhao, Y., and J. G. Teng. "Buckling Experiments on Cone-Cylinder Intersections under Internal Pressure." Journal of Engineering Mechanics 127, no. 12 (December 2001): 1231–39. http://dx.doi.org/10.1061/(asce)0733-9399(2001)127:12(1231).

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24

Teng, J. G., Y. Zhao, and L. Lam. "Techniques for buckling experiments on steel silo transition junctions." Thin-Walled Structures 39, no. 8 (August 2001): 685–707. http://dx.doi.org/10.1016/s0263-8231(01)00030-1.

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25

Woźnicka, Urszula, Krzysztof Drozdowicz, and Joanna Dabrowska. "A generalized interpretation of buckling experiments for thermal neutrons." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 455, no. 3 (December 2000): 660–69. http://dx.doi.org/10.1016/s0168-9002(00)00531-3.

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26

Zhou, Jiahui, Peng Yang, Jie Sun, Chenyu Shi, and Jianghong Xue. "Application of Matlab to Data Processing of Buckling Experiments." IOP Conference Series: Materials Science and Engineering 746 (March 5, 2020): 012008. http://dx.doi.org/10.1088/1757-899x/746/1/012008.

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27

Shojaee, T., B. Mohammadi, and R. Madoliat. "Experimental and numerical investigation of stiffener effects on buckling strength of composite laminates with circular cutout." Journal of Composite Materials 54, no. 9 (September 23, 2019): 1141–60. http://dx.doi.org/10.1177/0021998319874101.

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In the notched structures, to achieve maximum buckling resistance in comparison with structural weight, the optimal design of a stiffener is very important. In this research, after a review of the existing literature, nonlinear buckling behavior of composite plates containing the cutout with three different designs of stringer was investigated. The considered stiffeners are planer, longitudinal, and ring types. The buckling experiments were carried out on the stiffened plates containing a circular notch. Moreover, to achieve an efficient prediction of the buckling in the stiffened laminate with the hole, a finite strip method is developed based on the Airy stress function and von Karman’s large deformation equations. Studies show that there is a good agreement between the postbuckling behaviors derived from developed finite strip method with experimental results. Fast convergence of the considered finite strip method compared with the finite element results shows its efficiency for prediction of buckling behavior in laminated composites. The results show that the buckling load-bearing capacities of perforated plates with a longitudinal and planer stiffener are higher compared with the other stiffener, respectively. The detailed parametric study on the effects of thickness of the plate and stiffener and opening diameter on buckling behavior was performed using experiments and modeling.

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28

DEGENHARDT, RICHARD, ALEXANDER KLING, HERMANN KLEIN, WOLFGANG HILLGER, HANS CHRISTIAN GOETTING, ROLF ZIMMERMANN, KLAUS ROHWER, and ANDREAS GLEITER. "EXPERIMENTS ON BUCKLING AND POSTBUCKLING OF THIN-WALLED CFRP STRUCTURES USING ADVANCED MEASUREMENT SYSTEMS." International Journal of Structural Stability and Dynamics 07, no. 02 (June 2007): 337–58. http://dx.doi.org/10.1142/s0219455407002253.

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The aircraft and space industry strives for significantly reduced development and operating costs. Reduction of structural weight at safe design is one possibility to reach this objective which is aimed by the following two running research projects: the EC project "COCOMAT" and the ESA study "Probabilistic Aspects of Buckling Knock Down Factors". These projects develop improved concepts and tools for a fast and reliable simulation of the buckling and the postbuckling behavior of thin-walled structures up to collapse, respectively, which allow the exploitation of considerable reserves in primary fibre composite structures in aerospace applications. For the validation of the concepts and tools, a sound database of experiments is needed which is also performed within these projects. This paper focuses on the experimental activities within these projects performed at the buckling test facility of the Institute of Composite Structures and Adaptive Systems (DLR). It presents an overview about the DLR buckling, postbuckling and collapse tests which are already finished and gives an outlook to the results which are expected until the end of the running projects. This paper explains the working of the buckling test facility, the advanced measurement systems, which are running in parallel to the tests, and gives exemplarily two test results. The structures considered are unstiffened cylinders (ESA study) as well as panels, which are understood as sections of cylinders, stiffened by stringers (COCOMAT project). The unstiffened cylinders are more related to space applications (e.g. Ariane busters or parts of the international space station ISS) and the stiffened panels focus more on aircraft structures (e.g. fuselage). The load case considered for all investigations presented in this paper is axial compression under static loading although the test facility is also ready to apply torsion and internal pressure, as well as dynamic axial impact.

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29

Jo, Byeongnam, Koji Okamoto, and Naoto Kasahara. "Creep Buckling of 304 Stainless-Steel Tubes Subjected to External Pressure for Nuclear Power Plant Applications." Metals 9, no. 5 (May 9, 2019): 536. http://dx.doi.org/10.3390/met9050536.

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The creep-buckling behaviors of cylindrical stainless-steel tubes subjected to radial external pressure load at elevated temperatures—800, 900, and 1000 °C—were experimentally investigated. Prior to the creep-buckling tests, the buckling pressure was measured under each temperature condition. Then, in creep-buckling experiments, the creep-buckling failure time was measured by reducing the external pressure load for two different tube specimens—representing the first and second buckling modes—to examine the relationship between the external pressure and the creep-buckling failure time. The measured failure time ranged from <1 min to <4 h under 99–41% loading of the buckling pressure. Additionally, an empirical correlation was developed using the Larson–Miller parameter model to predict the long-term buckling time of the stainless-steel tube column according to the experimental results. Moreover, the creep-buckling processes were recorded by two high-speed cameras. Finally, the characteristics of the creep buckling under radial loading were discussed with regard to the geometrical imperfections of the tubes and the material properties of the stainless steel at the high temperatures.

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30

Mokbel, Marcel, Adel Djellouli, Catherine Quilliet, Sebastian Aland, and Gwennou Coupier. "Post-buckling dynamics of spherical shells." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2253 (September 2021): 20210378. http://dx.doi.org/10.1098/rspa.2021.0378.

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We explore the intrinsic dynamics of spherical shells immersed in a fluid in the vicinity of their buckled state, through experiments and three-dimensional axisymmetric simulations. The results are supported by a theoretical model that accurately describes the buckled shell as a two-variable-only oscillator. We quantify the effective ‘softening’ of shells above the buckling threshold, as observed in recent experiments on interactions between encapsulated microbubbles and acoustic waves. The main dissipation mechanism in the neighbouring fluid is also evidenced.

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31

Tu, Ji Lin, Yong Jun Wang, Sheng Min Wei, Xiao Peng Hui, and Chao Bin Qiu. "Study on Bladder Forming of the Shallow Basin-Shaped Aluminum Sheet Parts." Applied Mechanics and Materials 599-601 (August 2014): 591–94. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.591.

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The shallow basin-shaped aluminum sheet part had buckling defects after the bladder forming. Analysis the buckling defects’ mechanism, according to these, we proposed one step bladder forming process, used rolling leveler which could reduced the buckling height to level sheet before bladder forming, and made experiments to compare the structure effect of buckling height among the four kinds of die structure. The results showed that the one step bladder forming process is valid, and used the original die with sheet edge fold when it was bladder forming.

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32

Sivasaravanan, S., V. K. Bupesh Raja, and Sathishkumar. "Experimental Investigation on Buckling Analysis of Woven Glass Fiber/Epoxy Laminated Composite Materials." Applied Mechanics and Materials 766-767 (June 2015): 150–55. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.150.

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The structural components made from the composite materials possess outstanding advantages like reliable mechanical properties, durability, and good corrosion resistance, and low density. They also exhibit high impact resistance and good damage tolerance. These merits of composite structures draw the attention of scientists, engineers and researchers in generally the stability of composite structures is verified by carrying out buckling analysis. The aircraft components are made up of laminated composite plates are subjected to buckling analysis, in order to confirm whether the component withstand the critical in plane loads. Composite structural plates provided with circular cut out, square cut out and rectangular cut-out are widely used as structural members in aircraft and vehicle design. The different holes are provided in these members can be access holes, pass-through holes for any hardware or holes for windows and doors. Sometimes these holes are produced for weight reduction in the composite structural components. In this present study, buckling experiments were carried out on Epoxy/woven glass fiber laminated composite plate specimens and the influence of different cut-out shapes like circular, square and rectangle are examined and determined experimentally. Boundary conditions free and clamped were considered for all the experiments. After the buckling experiments, comparisons were made between these two test results. These results show the effect of various cut-out shapes on the buckling load.

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33

KOMIYA, Ryosuke, Kenkichi OHBA, Kiyoshi BANDO, Atsushi SAKURAI, and Tsutomu TAJIKAWA. "1113 Simulation experiments of asnma : Experiments in vitro on airway buckling in respiratory system." Proceedings of Conference of Kansai Branch 2005.80 (2005): _11–25_—_11–26_. http://dx.doi.org/10.1299/jsmekansai.2005.80._11-25_.

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34

Wu, J., H. C. Juvkam-Wold, and R. Lu. "Helical Buckling of Pipes in Extended Reach and Horizontal Wells—Part 1: Preventing Helical Buckling." Journal of Energy Resources Technology 115, no. 3 (September 1, 1993): 190–95. http://dx.doi.org/10.1115/1.2905992.

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This paper studies the helical buckling of pipes (drillstring and tubing) in extended reach and horizontal wells, theoretically and experimentally, resulting in new equations to correctly predict and effectively prevent the helical buckling of pipes in such wells. The theoretical study shows that the so-called helical buckling load that appears in the current literature is only the average axial load in the helical buckling development process. The laboratory experiments confirm the theoretical analysis. The new helical buckling load equations are formulated by combining the theoretical analysis and the experimental results, thereby resolving the existing assumption-and result inconsistency in the current literature. The new equation predicts the true helical buckling load to be about 1.3 times the so-called helical buckling load in the current literature, and about 1.8 times the critical buckling load that predicts the onset of sinusoidal buckling. Consequently, larger bit weights or packer setting loads can be applied to increase the drilling rate or to ensure a proper seal, before the helical buckling of the pipes can occur.

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35

BHETWAL, KRISHNA KUMAR, and SEISHI YAMADA. "EFFECTS OF CFRP REINFORCEMENTS ON THE BUCKLING BEHAVIOR OF THIN-WALLED STEEL CYLINDERS UNDER COMPRESSION." International Journal of Structural Stability and Dynamics 12, no. 01 (January 2012): 131–51. http://dx.doi.org/10.1142/s0219455412004665.

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This paper presents a novel way of strengthening thin-walled steel cylindrical shells against buckling during axial compression in which a small amount of fiber-reinforced polymer (FRP) composite, coated from both sides can increase the buckling strength effectively. The effects of the reinforcement and the angle of fiber orientation as well as initial geometric imperfections on the buckling load-carrying capacity have been made clear through the three kinds of analytical procedures; the conventional linear eigen value buckling analysis, the reduced stiffness (RS) buckling analysis and the fully nonlinear numerical experiments. These multiple treatments suggest obtaining valuable information for the design of FRP-based hybrid structural elements and discusses influence of FRP to increase the load-carrying capacity of the thin-walled metallic structures having complex buckling collapse behavior. This paper also discusses how the angle of fiber orientation affects on the buckling strength and the associated buckling modes of the thin-walled shells.

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36

Wu, J., and H. C. Juvkam-Wold. "The Effect of Wellbore Curvature on Tubular Buckling and Lockup." Journal of Energy Resources Technology 117, no. 3 (September 1, 1995): 214–18. http://dx.doi.org/10.1115/1.2835343.

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This paper studies tubular buckling in curved wellbores (such as the build section of horizontal wells) and its effect on tubular “lockup” in horizontal or extended-reach wells. New buckling load equations are derived to properly predict tubular sinusoidal and helical buckling in such wellbores. The results show that the buckling loads to initiate sinusoidal and helical buckling of tubulars in curved wellbores are usually much larger than those in straight wellbores. This is because the curved wellbore tends to hold the axially compressed tubular against the outer-curve side of the wellbore. The tubular becomes less easy to buckle until higher axial compressive loads are applied. Less tubular lockup risk is then predicted for tubulars in horizontal or extended-reach wells by using the new buckling load equations. The new buckling loads in curved wellbores agree with those in straight wellbores when wellbore curvature approaches zero. Small-scale laboratory experiments also confirmed these theoretically derived buckling loads.

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37

MOHAN, S. J., N. PRASAD RAO, and N. LAKSHMANAN. "FLEXURAL AND LOCAL BUCKLING INTERACTION OF STEEL ANGLES." International Journal of Structural Stability and Dynamics 05, no. 02 (June 2005): 143–62. http://dx.doi.org/10.1142/s0219455405001519.

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The column buckling equation and plate buckling equation are merged to obtain a graphical relation in the elastic and inelastic buckling ranges. This graphical relation has been used to classify all possible modes of hot rolled angle sections investigated by previous researchers in their experimental works. Forced plate buckling experiments have been carried out to verify the graphical relation for plate buckling. Design practices adopted by various standards for design of steel angles, have been compared with respect to this graphical relation and discussed. The importance of width to thickness ratio has been used to emphasize the buckling characteristics of hot rolled angle sections. The objective of this paper is to discuss the plate buckling failures of the angle sections recorded during full scale testing of transmission towers at Tower Testing and Research Station, SERC, Chennai, India. The plate buckling failures in tower testing for the past eighteen years have been analyzed and suggestions are given to avoid such failures in real structures and during testing.

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Chen, Limin, Yi Zhuo, Rongzhang Xu, and Houbing Wang. "Buckling and Post-buckling Characteristics of Stiffened Panels Under Compression-Shear Load." Journal of Physics: Conference Series 2403, no. 1 (December 1, 2022): 012008. http://dx.doi.org/10.1088/1742-6596/2403/1/012008.

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Abstract Experiments have been conducted to investigate the buckling and post-buckling behavior of a T-the stiffened composite panel in size of 2412 by 1420mm under a compression-shear load. DIC was used to monitor the local buckling and post-buckling, and the results were compared with that of strain gauges. The results show that DIC can accurately capture the displacement field and the whole progress of the buckling mode transition, and the buckling modes at different times are clearly and intuitively, the error of the initial buckling load is less than 5% compared with the load measured by the strain gauge. Four different buckling determination methods based on strain gauge measurement and DIC measurement are presented, and a more accurate and convenient method for judging buckling load is obtained. The initial principal strain angle is related to the ratio of shear stress to compressive stress and changes greatly after the buckling, and the fracture angle approaches 45 degrees. The experimental results show that the hole with 6mm in the weighted middle of the web has a slight effect on the buckling load but has an obvious effect on the load capacity.

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Li, Peng, Linan Li, Jing Wei Tong, Shi Bin Wang, Min Zhang, Jing Zhang, and Heng Sun. "Experimental Research on Buckling of Nano-Thin Film under Impact Load." Applied Mechanics and Materials 130-134 (October 2011): 1262–65. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1262.

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The experiments focused on thin film buckling under impact load had been completed. The axial impact experiments were done to different films on the PMMA substrate with the drop hammer device, the buckling images of the film surface were recorded after impact, and the problem of stress release was studied. It was found that buckle’s initiation and propagation were influenced by the materials of thin films and the impact times, and meanwhile buckle’s local distribution phenomenon was also found.

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40

Blachut, J., G. D. Galletly, and S. James. "On the Plastic Buckling Paradox for Cylindrical Shells." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 5 (September 1996): 477–88. http://dx.doi.org/10.1243/pime_proc_1996_210_221_02.

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Previous investigations have raised some doubts about the accuracy of flow theory predictions for a few plate and shell plastic buckling problems. The present series of buckling experiments on machined, mild steel, cylindrical shell models under non-proportional biaxial loading (axial tension plus external pressure) was designed to provide additional data for the evaluation of the J2 plasticity theories. Numerical calculations were carried out with the BOSOR 5 shell buckling program, using the J2 deformation and flow theories, and these were compared with the test results. Neither theory can be said to predict plastic buckling accurately. However, deformation theory predicted the bifurcation buckling loads reasonably well, whereas flow theory was often incorrect.

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41

Roorda, John. "Buckling behaviour of thin-walled columns." Canadian Journal of Civil Engineering 15, no. 1 (February 1, 1988): 107–16. http://dx.doi.org/10.1139/l88-012.

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This paper describes the interactive buckling behaviour of thin-walled columns by means of a simple engineering analysis. After a brief review of individual column and plate buckling phenomena, the effect of one upon the other is investigated in the presence of initial imperfections. Estimates of the ultimate load capacity of such columns and the effects of material yielding are obtained. The results are compared with published experimental data, yielding good correspondence. The work clearly demonstrates that the interactive presence of Euler buckling, plate buckling, imperfections, and material yielding in thin-walled columns has a serious detrimental effect on their ultimate strength. Key words: buckling, stability, interaction, imperfections, yield, plates, columns, thin-walled, cold-formed, steel, experiments.

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42

Wall, M. A., and M. E. Kassner. "In situ reversed deformation of aluminum single crystals in the HVEM: a new X-Y straining stage." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 248–49. http://dx.doi.org/10.1017/s0424820100137616.

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The metal fatigue phenomenon is poorly understood, partially because the dislocation dynamics of reversed deformation have not been well characterized. Little success has been realized with the direct observation of dislocations during in situ cyclic deformation. Problems associated with buckling of the specimen foil occur during applied shear, bending or compression. Buckling can preclude adequate imaging conditions and further complicate the thin foil stress-state. Recent experiments have shown that dislocation movement can be reversed by tensile stressing in alternate perpendicular directions (i.e. 90° rotation of the tensile stress to X and Y directions results in the reversal of the shear stress). Buckling of the specimen foil is also reduced in these experiments.Results from recent in situ reversed deformation experiments are presented here. The experiments were performed on a new straining stage which is a modification of the Sleeswyk- Kassner X-Y stage. The specimen design and preparation procedures have also been modified to facilitate better and more reproducible in situ experiments. The new X-Y straining stage is illustrated in figure 1.

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43

Dirgantara, T., I. S. Putra, A. A. Sucipto, and A. Jusuf. "Buckling Analysis of Cylindrical Shells Having a Longitudinal Crack." Key Engineering Materials 306-308 (March 2006): 49–54. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.49.

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The presence of cracks or similar imperfections can considerably reduce the buckling load of a shell structure. In this paper, buckling analysis of cylindrical shells with a longitudinal crack is presented. Numerical buckling analyses of cylindrical shells were performed using FEM, and verified by experiment. The numerical analyses and experiments were conducted for several crack lengths and radius of curvature, and two different boundary conditions were applied, i.e. simply support and clamp in all sides. The results show the effect of the presence of crack to the critical buckling load of the shells. There are good agreements between experimental and numerical results.

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Shao, Xiao Jun, and Zhu Feng Yue. "Compressive Experiment and Damage Simulation of a Composite Structure with Ply Drop-Off." Key Engineering Materials 334-335 (March 2007): 301–4. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.301.

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Compressive experiments and finite element method (FEM) have been used to study the mechanical behavior of composite laminate with plies drop-off. A user subroutine has been implemented to ABAQUS to simulate the damage development of the laminate plate. This user subroutine has taken consideration of the mechanical properties degradation according to development of three types of damage. The load-strain curves can agree with each other between experiments and FEM. The detail of damage development of the plies drop-off composite laminate under compressive loading can be described as followed. Matrix cracking damage and fiber-matrix shearing damage occur simultaneously at first, and then fiber buckling damage initiates. Matrix cracking and fiber-matrix shearing are very dangerous to the carrying capacity of laminate and fiber buckling intensifies further this effect. The initiation and development of fiber buckling indicates that laminate loses carrying capacity at all.

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Huang, Wenjun, and Deli Gao. "Combined Effects of Wellbore Curvature, Connector, and Friction Force on Tubular Buckling Behaviors." SPE Journal 24, no. 05 (May 15, 2019): 2083–96. http://dx.doi.org/10.2118/195680-pa.

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Summary A tubular buckling model is built, while considering the combined effects of wellbore curvature, tubular connector, and friction force. On the basis of certain assumptions, the expressions of critical helical–buckling loads are deduced with the equivalent beam–column model and energy method and the amendment factors of critical buckling loads because of relevant factors are obtained. The results from the new model are compared with those from previous models and experiments. The roles of relevant factors in tubular mechanical behaviors are discussed. It is indicated that wellbore curvature affects equivalent tubular–string weight, the connectors affect potential energy, and friction force leads to dissipative energy in the buckling–initiation process. Critical helical–buckling loads are most likely underestimated if the combined effects are not considered.

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Falter, B., J. Müller-Rochholz, J. Eilers, and M. Gutermann. "Buckling experiments on polyethylene liners with egg-shaped cross-sections." Geosynthetics International 15, no. 2 (April 2008): 152–64. http://dx.doi.org/10.1680/gein.2008.15.2.152.

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Tudela, Mark A., Paul A. Lagace, and Brian Wardle. "Buckling Response of Transversely Loaded Composite Shells, Part 1: Experiments." AIAA Journal 42, no. 7 (July 2004): 1457–64. http://dx.doi.org/10.2514/1.11884.

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MURASE, Katsuhiro, and Norman JONES. "Experiments on the Dynamic Axial Plastic Buckling of Circular Tubes." Journal of the Society of Materials Science, Japan 42, no. 483 (1993): 1420–26. http://dx.doi.org/10.2472/jsms.42.1420.

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49

Bull, Jonathan M., Joseph Martinod, and Philippe Davy. "Buckling of the oceanic lithosphere from geophysical data and experiments." Tectonics 11, no. 3 (June 1992): 537–48. http://dx.doi.org/10.1029/91tc02908.

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Kolsters, H., and D. Zenkert. "Buckling of laser-welded sandwich panels: Ultimate strength and experiments." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 224, no. 1 (September 25, 2009): 29–45. http://dx.doi.org/10.1243/14750902jeme174.

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