Relevant bibliographies by topics / Buckling verification / Journal articles

Journal articles on the topic 'Buckling verification'

To see the other types of publications on this topic, follow the link: Buckling verification.
Author: Grafiati
Published: 11 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Buckling verification.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Braun, Benjamin, Martin Deutscher, and Ulrike Kuhlmann. "Stability verification of hydraulic steel structures." Advances in Structural Engineering 21, no. 16 (July 17, 2018): 2553–70. http://dx.doi.org/10.1177/1369433218787722.

Full text
Abstract:
An overview and assessment for buckling verification of plate- and shell-like elements in hydraulic steel structures is given with regard to current standards DIN 19704-1, EN 1993-1-5, EN 1993-1-6, and EN 1993-1-7. Background information is included for verification procedures that require some explanations either due to gaps or fragmentation in several EN parts. A general way forward for the future framework with regard to buckling verification of hydraulic steel structures is proposed based on the findings herein.
APA, Harvard, Vancouver, ISO, and other styles
2

Jing, Zhao, Qin Sun, Ke Liang, and Jianqiao Chen. "Closed-Form Critical Buckling Load of Simply Supported Orthotropic Plates and Verification." International Journal of Structural Stability and Dynamics 19, no. 12 (December 2019): 1950157. http://dx.doi.org/10.1142/s0219455419501578.

Full text
Abstract:
The buckling mode is important to determine the critical load of specially orthotropic rectangular plates under axial compression with simply supported boundary. However, in classical laminated plate theory (CLPT), the critical buckling mode can only be obtained by iterative or numerical methods. This paper derives the critical buckling mode mathematically and presents the critical buckling load in closed form. By taking advantage of the derived closed-form solution, it is convenient to investigate the effects of aspect ratio, load ratio, and fiber orientation on the buckling load, and the parameters affecting the buckling mode can be easily obtained. The first-order shear deformation theory (FSDT)-based finite element method is developed to verify the closed-form solution. The bending-torsional coupling effects are analyzed and discussed to assess the approximation of the buckling behavior of specially orthotropic plates to general laminates. The obtained finite element solutions of general laminates are compared with the closed-form solutions of specially orthotropic plates. The accuracy of approximation of the buckling behavior of specially orthotropic plates to the general laminates increases as the bending-torsional coupling coefficients decrease. The closed-form solution can be applied to laminates with small bending-torsional coupling coefficients.
APA, Harvard, Vancouver, ISO, and other styles
3

Deo, M. V., and P. Michaleris. "Experimental Verification of Distortion Analysis of Welded Stiffeners." Journal of Ship Production 18, no. 04 (November 1, 2002): 216–25. http://dx.doi.org/10.5957/jsp.2002.18.4.216.

Full text
Abstract:
This paper presents an experimental verification for the predictive distortion analysis approach proposed in Michaleris & DeBicarri (1996,1997) and Vanli & Michaleris (2001) for welded T-type stiffeners. The predictive technique employing the decoupled 2-D and 3-D approach is used for the prediction of buckling distortion and the magnitude of bowing distortion. Two-dimensional thermo-mechanical welding process simulations are performed to determine the residual stress. The critical buckling stress along with the buckling mode are computed in 3-D eigenvalue analyses. Large deformation analyses are carried out to predict the magnitude of bowing distortion. Experimental validation of the prediction is carried out in the lab. Welding experiments are carried out using welding conditions identical to those used in the FEA model. The computational results are then verified with experimental observations
APA, Harvard, Vancouver, ISO, and other styles
4

Bluhm, Gore Lukas, Keld Christensen, Konstantinos Poulios, Ole Sigmund, and Fengwen Wang. "Experimental verification of a novel hierarchical lattice material with superior buckling strength." APL Materials 10, no. 9 (September 1, 2022): 090701. http://dx.doi.org/10.1063/5.0101390.

Full text
Abstract:
Recently, a systematic approach for the design of lattice materials with extreme buckling strength has led to optimized hierarchical lattice materials with unprecedented load carrying capacity. This is obtained at the cost of a small decrease in linear stiffness. However, the superior buckling resistance of such optimized hierarchical lattice materials has so far only been predicted numerically. In fact, concerns have been raised regarding the validity of the employed linear buckling analysis and potential risk of catastrophic failure due to the coalescence of multiple critical buckling modes. This work aims at refuting these concerns by designing and testing manufacturable novel hierarchical lattice materials with superior buckling strength. Thereby, the basis is provided for wide applications of these high-performing materials in mechanical design. A novel hierarchical material is generated for this work by combining the mentioned design procedure with a requirement on the minimum feature size to ensure manufacturability. For addressing the raised concerns, the optimized material design, together with a reference material, is realized with the help of additive manufacturing and experimentally tested in uniaxial compression. The obtained results are compared to numerical simulations considering geometrical and material nonlinearities, and an overall good agreement is found between experimental and numerical results. This confirms an increase in buckling resistance and post-buckling load carrying capacity by a factor of more than three compared to the regular reference lattice structure. Hence, the buckling superiority of this novel type of architected materials is clearly demonstrated.
APA, Harvard, Vancouver, ISO, and other styles
5

GE, HANBIN, and XIAOQUN LUO. "A SEISMIC PERFORMANCE EVALUATION METHOD FOR STEEL STRUCTURES AGAINST LOCAL BUCKLING AND EXTRA-LOW CYCLE FATIGUE." Journal of Earthquake and Tsunami 05, no. 02 (June 2011): 83–99. http://dx.doi.org/10.1142/s1793431111001005.

Full text
Abstract:
A practical performance evaluation method against local buckling and extra-low cycle fatigue (ELCF) is proposed in this study for steel structures. For thin-walled steel structures, local buckling is the main failure mode while brittle fracture due to ductile crack initiation under ELCF loading should be the dominant failure in thick-walled steel structures. A damage index verification method based on an FEM analysis using shell elements was previously presented by the authors to evaluate such a ductile failure. In the present study, a simplified verification method based on a fiber model FEM analysis using beam elements is proposed and the damage index is modified to consider strain concentration effects. Comparisons between experimental and analytical results show good prediction of ductile crack initiation in the current study. Finally, a unified verification method against local buckling and ELCF is summarized.
APA, Harvard, Vancouver, ISO, and other styles
6

Anandjiwala, R. D., and J. W. Gonsalves. "Nonlinear Buckling of Woven Fabrics Part II: Recovery from Buckling and Experimental Verification." Textile Research Journal 79, no. 1 (January 2009): 4–13. http://dx.doi.org/10.1177/0040517508091316.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hradil, Petr, and Asko Talja. "Numerical verification of stainless steel overall buckling curves." Thin-Walled Structures 83 (October 2014): 52–58. http://dx.doi.org/10.1016/j.tws.2014.01.011.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Karamanos, Spyros A., and John L. Tassoulas. "Tubular Members. II: Local Buckling and Experimental Verification." Journal of Engineering Mechanics 122, no. 1 (January 1996): 72–78. http://dx.doi.org/10.1061/(asce)0733-9399(1996)122:1(72).

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Koyano, Kazuhisa, Masanori Fujita, and Mamoru Iwata. "Verification of Clearance and Gap for Fabricating the Buckling-Restrained Brace Using Steel Mortar Planks." Key Engineering Materials 763 (February 2018): 941–48. http://dx.doi.org/10.4028/www.scientific.net/kem.763.941.

Full text
Abstract:
The buckling-restrained brace must be able to provide the designed structural performance in actual use. In other words, the buckling-restrained brace must retain its initial quality in during the fabricating process. In this study, for the purpose of ensuring the initial quality of the buckling-restrained brace using steel mortar planks (BRBSM), quality control values at the time of fabrication are set and conduct verification testing on clearance and gap.
APA, Harvard, Vancouver, ISO, and other styles
10

Kala, Zdeněk. "Probabilistic Verification of Structural Stability Design Procedures." Open Civil Engineering Journal 12, no. 1 (September 27, 2018): 283–89. http://dx.doi.org/10.2174/1874149501812010283.

Full text
Abstract:
Introduction: This contribution presents a comparison of three methods of the statistical computation of the design load-carrying capacity of a steel plane frame. Two approaches of the European Standard Eurocode 3 and one stochastic approach are applied. The stochastic approach takes into account the random influence of all imperfections and can be applied to the reliability verification of design according to Eurocode 3. Methods: The columns and beams in the steel frame are modelled with beam elements using the stability solution with buckling length and the geometrically nonlinear solution. The stochastic computational model is based on the geometrically nonlinear solution and on the random influence of initial imperfections, whose random samplings are simulated using the Monte Carlo method. Results and Conclusion: The design load-carrying capacity of the steel plane frame computed using the stability solution with buckling length is in good agreement with the stochastic solution in which the design value is calculated as 0.1 percentile. On the contrary, the geometrically nonlinear solution according to Eurocode 3 gives the lowest (safest) values of design load-carrying capacity.
APA, Harvard, Vancouver, ISO, and other styles
11

Jeon, Sang Youn, and Young Shin Lee. "An Estimation of the Dynamic Buckling Load for the Spacer Grid of Pressurized Water Reactor Fuel Assembly." Key Engineering Materials 326-328 (December 2006): 1603–6. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1603.

Full text
Abstract:
This study contains an estimation of the dynamic buckling load for the spacer grid of fuel assembly in pressurized water reactor. Three different estimation methods were proposed for the calculation of the dynamic buckling loads of spacer grid. The dynamic impact tests and analyses were performed to evaluate the impact characteristics of the spacer grids and to predict the dynamic buckling load of the full size spacer grid. The estimation results were compared with the test results for the verification of the estimation methods.
APA, Harvard, Vancouver, ISO, and other styles
12

Liu, Lin, Chao Liu, and Xue Jun Yin. "Experimental Verification of a Full-Size Buckling Restrained Brace." Applied Mechanics and Materials 166-169 (May 2012): 3147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.3147.

Full text
Abstract:
This paper presents experimental and finite element analysis result of a full-size Buckling Restrained Brace (BRB). The brace consists of a steel core encased in a steel tube filled with concrete. The low-cycle fatigue check was incorporated into the cyclic test program. Test results show that the BRB product can develop stable hysteretic responses up to core axial strain of 1.3% and the maximum compressive loads is 1.23 times the actual yield load. The specimen performs well through the whole test sequence. Nonlinear finite element analysis was conducted for a comparison analysis, and contact interactions between the steel core and concrete infill were modeled. The finite element model can reasonably predict the compression behavior and post-yield strength of the specimen.
APA, Harvard, Vancouver, ISO, and other styles
13

Zhu, Xin Yu, and Jun Wen Lu. "Stress and Buckling Analysis of a Certain Type of All-Composite Landing Gear." Advanced Materials Research 663 (February 2013): 692–97. http://dx.doi.org/10.4028/www.scientific.net/amr.663.692.

Full text
Abstract:
FEA method was conducted to investigate static stress and buckling analysis of a certain all-composite landing gear strut. The critical buckling load and bucking mode shapes of the landing gear is obtained using ANSYS finite element analysis code. The first six buckling mode shapes and static stress distribution are given. According to the analysis results, the dynamic characteristics of the landing gear are discussed. The analysis method and results in this paper can be used for further study on making maintenance plan and safety verification for the landing gear.
APA, Harvard, Vancouver, ISO, and other styles
14

Agapov, Vladimir P., and Alexey S. Markovich. "Dynamic method for determining critical loads in the PRINS computer program." Structural Mechanics of Engineering Constructions and Buildings 16, no. 5 (December 15, 2020): 380–89. http://dx.doi.org/10.22363/1815-5235-2020-16-5-380-389.

Full text
Abstract:
Relevance. Buckling analysis is important in the design of buildings and structures. It is used in various fields of engineering - mechanical engineering, aircraft and shipbuilding, civil engineering, etc. Until the second half of the twentieth century, mainly analytical methods of buckling were applied in practice. With the appearance of computers, numerical methods, in particular, the finite element analysis, began to prevail. Buckling analysis was implemented in programs of finite element analysis, such as NASTRAN, ANSYS, ABAQUS, ADAMS, DIANA, and others. In view of great responsibility, buckling analysis of structure should be carried out using at least two different programs. However, due to the high cost of software products, not all project organizations are able to have a number of programs. An alternative is to develop programs that can complete buckling analysis using several methods. This would increase the reliability and quality of calculation results. The PRINS computer program has opportunity for buckling analysis using two methods - static and dynamic. The aims of the work - to show the theoretical aspects and practical implementation of the dynamic principle of buckling analysis in buildings and structures using finite element method, as well as to give the algorithm implemented in the PRINS program and the results of verification calculations confirming its reliability. Results. The algorithm presented in this article and implemented in the PRINS computer program allows to determine critical loads using a dynamic buckling criterion. On the basis of numerous verification calculations, it was established that the implemented algorithm was effective for determining critical loads in frame, thin-walled and ribbed plate structures. The use of the PRINS computer program enables to use an alternative method for determining critical loads for a wide class of engineering problems in addition to the classical (static) method.
APA, Harvard, Vancouver, ISO, and other styles
15

Paczos, Piotr, and Aleksandra M. Pawlak. "Experimental Optical Testing and Numerical Verification by CuFSM of Compression Columns with Modified Channel Sections." Materials 14, no. 5 (March 7, 2021): 1271. http://dx.doi.org/10.3390/ma14051271.

Full text
Abstract:
Thin-walled channel columns with non-standard cross-section shapes loaded with gradually increasing compressive force applied at the geometric centre of gravity of the cross-section were the subject of the investigations presented in this paper. The aim of the research was to determine which of the columns has the most favourable geometrical characteristics in terms of the applied load. The main investigation was an experimental study carried out using two methods: strain gauging and the optical method. Based on strain gauging, the critical forces were determined using the strain averaging method and the linear regression tangent to compression plot method. In addition, modern optical tests were performed using the ARAMIS system. The buckling forces at which the first signs of buckling appear and the buckling modes of columns were determined. The results obtained from the experimental tests were used to validate the results of numerical tests carried out using the Finite Strip Method (CuFSM). Based on this method, the values of critical forces and the percentage contribution of individual buckling forms to the loss of stability of the compressed columns were determined.
APA, Harvard, Vancouver, ISO, and other styles
16

Barski, Marek, Aleksander Muc, Przemysław Pastuszak, and Agnieszka Bondyra. "Numerical and Experimental Buckling and Post - Buckling Analysis of Composite Cylindrical Panel with Delamination." Applied Mechanics and Materials 477-478 (December 2013): 39–42. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.39.

Full text
Abstract:
The present work is devoted to the analysis of a buckling behavior of a cylindrical composite panel. The considered structure is subjected to the uniform axial compression. The wall of the panel consists of the 8 layers. In addition, in the geometrical center of the structure there is a square delamination located between the fourth and the fifth layer. The main goal is to determine the buckling and post - buckling behavior as well as the influence of the delamination on the stability of the structure. The nonlinear numerical analysis is carried out with aid of the FEM method. The experimental verification is also performed. The results obtained from numerical and experimental analysis show very similar behavior of the structure.
APA, Harvard, Vancouver, ISO, and other styles
17

SCHNEIDER, W., and M. GETTEL. "NUMERICAL BUCKLING STRENGTH VERIFICATION OF CYLINDRICAL STEEL SHELL STRUCTURES SUBJECT TO COMBINED LOADING." International Journal of Structural Stability and Dynamics 07, no. 02 (June 2007): 295–311. http://dx.doi.org/10.1142/s0219455407002265.

Full text
Abstract:
The inevitable deviations from the nominal data of the resistance parameters have to be included in a numerical calculation of the load-bearing capacity of shells, because these structures are very imperfection-sensitive. The assumed imperfections are fundamental for the numerical buckling strength verification, because they have to cover the influence of all accidental imperfections of the structure in a consistent manner. Consistent equivalent geometric imperfections have been developed during the last years for the basic buckling cases of the circular cylindrical steel shell. The situation at shells subject to combined loading is more difficult, because not so much experimental data is available. Fundamental problems and previous proposals for assuming equivalent imperfections at combined loading are discussed in the contribution. In particular, it is a moot point whether the equivalent geometric imperfections have to be chosen without regard to the load case, because imperfections of real shells are caused by manufacturing and not by loading. Reasons are given for, why this is not applicable at equivalent imperfections of a numerical simulation. The conception of quasi-collapse-affine imperfections, which has already been proved at the basic buckling cases, can also be applied to shells under combined loading.
APA, Harvard, Vancouver, ISO, and other styles
18

Pešek, Ondřej, Martin Horáček, and Jindřich Melcher. "Experimental Verification of the Buckling Strength of Structural Glass Columns." Procedia Engineering 161 (2016): 556–62. http://dx.doi.org/10.1016/j.proeng.2016.08.691.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Götz, Benedict, Maximilian Schaeffner, Roland Platz, and Tobias Melz. "Model Verification and Validation of a Piezo-Elastic Support for Passive and Active Structural State Control of Beams with Circular Cross-Section." Applied Mechanics and Materials 807 (November 2015): 67–77. http://dx.doi.org/10.4028/www.scientific.net/amm.807.67.

Full text
Abstract:
Beams in lightweight truss structures are subject to axial and lateral loads that may lead to undesired structural vibration or failure by buckling. The axial and lateral forces may be transferred via the truss supports that offer possibilities for state control of single beams and larger structures. In earlier own studies, the concept of a piezo-elastic support for active buckling control and resonant shunt damping has been investigated. An elastic spring element is used to allow a rotation in the beam's bearing in any plane perpendicular to the beam's longitudinal axis. The rotation is laterally transferred to an axial displacement of piezoelectric stack transducers that are either used to generate active lateral forces for active buckling control or to attenuate vibrations with a resonant shunt. In this paper, the model verification and validation of the elastic properties of the piezo-elastic support for passive and active structural control of beams with circular cross-section is presented. The rotational and lateral spring element stiffness is investigated numerically and experimentally and the existing models are updated in the verification process. The model is validated by comparing the numerical results and experimental ability for vibration attenuation.
APA, Harvard, Vancouver, ISO, and other styles
20

Yang, Hong, Yuntian Wu, Pengcheng Mo, and Jinke Chen. "Improved Nonlinear Cyclic Stress–Strain Model for Reinforcing Bars Including Buckling Effect and Experimental Verification." International Journal of Structural Stability and Dynamics 16, no. 01 (January 2016): 1640005. http://dx.doi.org/10.1142/s0219455416400058.

Full text
Abstract:
Buckling is an important nonlinear behavior of steel reinforcing bars subjected to repeated compression and tension strain reversals, which significantly affects the overall cyclic behavior of reinforced concrete (RC) elements and impairs their load-carrying and energy-dissipation capacities during strong earthquakes. The accuracy of numerical assessment of the seismic performance of RC elements can be much improved if the buckling effect is effectively included in the stress–strain model of reinforcing bars. In this paper, modified Gomes–Appleton cyclic steel stress–strain relationship intended for improved accuracy is presented, which is suitable for inclusion in programs based on Opensees platform for the nonlinear analysis of RC elements. The modification is developed to improve the simulation accuracy of the inelastic buckling stress–strain path by a simplified model based on the equilibrium of a plastic mechanism of buckled bar consisting of four plastic hinges. Then an adjustment coefficient is introduced to further modify the developed buckled bar stress–strain model. A comparison of the numerical simulated results with experimental results of 36 steel bars subjected to reversed tension-compression loading is performed to verify the accuracy and effectiveness of the proposed model.
APA, Harvard, Vancouver, ISO, and other styles
21

Kim, Dae-Hong, and Jung-Han Yoo. "Finite Element Model Verification of Buckling Restrained Brace With Nonlinear Behavior." Journal of The korean Association For Spatial Structures 21, no. 2 (June 15, 2021): 81–88. http://dx.doi.org/10.9712/kass.2021.21.2.81.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Park, Sung-Jun, Myung-Gyun Ko, Dong-Gwan Kim, Sang-Kuk Kim, Chang-Oh Moon, Jin-Hwe Kweon, and Jin-Ho Choi. "Design and Verification of Shear Buckling Test Fixture for Composite Laminate." Composites Research 27, no. 4 (August 31, 2014): 158–67. http://dx.doi.org/10.7234/composres.2014.27.4.158.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Barbero, Ever J., Edgar K. Dede, and Shannon Jones. "Experimental verification of buckling-mode interaction in intermediate-length composite columns." International Journal of Solids and Structures 37, no. 29 (July 2000): 3919–34. http://dx.doi.org/10.1016/s0020-7683(99)00172-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Giannopoulos, Georgios, Javier Monreal, and John Vantomme. "Snap-through buckling behavior of piezoelectric bimorph beams: II. Experimental verification." Smart Materials and Structures 16, no. 4 (June 25, 2007): 1158–63. http://dx.doi.org/10.1088/0964-1726/16/4/025.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

Hansen, Thomas. "Post-buckling strength of plate girders subjected to shear - experimental verification." Steel Construction 11, no. 1 (October 5, 2017): 65–72. http://dx.doi.org/10.1002/stco.201710035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Park, Ho Jin, and Jin Young Cho. "Critical Buckling Generation of TCA Benchmark by the B1 Theory-Augmented Monte Carlo Calculation and Estimation of Uncertainties." Energies 14, no. 9 (April 30, 2021): 2578. http://dx.doi.org/10.3390/en14092578.

Full text
Abstract:
The Korea Atomic Energy Research Institute (KAERI) has developed the DeCART2D 2-dimensional (2D) method of characteristics (MOC) transport code and the MASTER nodal diffusion code and has established its own two-step procedure. For design code licensing, KAERI prepared a critical experiment on the verification and validation (V&V) of the DeCART2D code. DeCART2D is able to perform the MOC calculation only for 2D nuclear fuel systems, such as the fuel assembly. Therefore, critical buckling in the vertical direction is essential for comparison between the results of experiments and DeCART2D. In this study, the B1 theory-augmented Monte Carlo (MC) method was adopted for the generation of critical buckling. To examine critical buckling using the B1 theory-augmented MC method, TCA critical experiment benchmark problems were considered. Based on the TCA benchmark results, it was confirmed that the DeCART2D code with the newly-generated critical buckling predicts the criticality very well. In addition, the critical buckling generated by the B1 theory-augmented MC method was bound to uncertainties. Therefore, utilizing basic equations (e.g., SNU S/U formulation) linking input uncertainties to output uncertainties, a new formulation to estimate the uncertainties of the newly generated critical buckling was derived. This was then used to compute the uncertainties of the critical buckling for a TCA critical experiment, under the assumption that nuclear cross-section data have uncertainties.
APA, Harvard, Vancouver, ISO, and other styles
27

Kalnins, Kaspars, Mariano A. Arbelo, Olgerts Ozolins, Eduards Skukis, Saullo G. P. Castro, and Richard Degenhardt. "Experimental Nondestructive Test for Estimation of Buckling Load on Unstiffened Cylindrical Shells Using Vibration Correlation Technique." Shock and Vibration 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/729684.

Full text
Abstract:
Nondestructive methods, to calculate the buckling load of imperfection sensitive thin-walled structures, such as large-scale aerospace structures, are one of the most important techniques for the evaluation of new structures and validation of numerical models. The vibration correlation technique (VCT) allows determining the buckling load for several types of structures without reaching the instability point, but this technique is still under development for thin-walled plates and shells. This paper presents and discusses an experimental verification of a novel approach using vibration correlation technique for the prediction of realistic buckling loads of unstiffened cylindrical shells loaded under axial compression. Four different test structures were manufactured and loaded up to buckling: two composite laminated cylindrical shells and two stainless steel cylinders. In order to characterize a relationship with the applied load, the first natural frequency of vibration and mode shape is measured during testing using a 3D laser scanner. The proposed vibration correlation technique allows one to predict the experimental buckling load with a very good approximation without actually reaching the instability point. Additional experimental tests and numerical models are currently under development to further validate the proposed approach for composite and metallic conical structures.
APA, Harvard, Vancouver, ISO, and other styles
28

Dallemule, Marian. "Equivalent Imperfections In Arched Structures." Slovak Journal of Civil Engineering 23, no. 3 (September 1, 2015): 9–15. http://dx.doi.org/10.1515/sjce-2015-0012.

Full text
Abstract:
Abstract There are currently three design methods to verify the in-plane buckling of an arched structure: substitute member method, the method of equivalent imperfection with recommendations for arched bridges, and the equivalent unique global and local initial imperfection method (EUGLI), which uses the critical elastic buckling mode as an imperfection. The latter method is included in the EN 1993-1-1 cl. 5.3.2 (11) since 2002; however, to this day it is neither utilized in the design practice nor is it incorporated in ordinary structural analysis software. The main purpose of this article is to show the application of the proposed methods in a step-by-step manner to the numerical example considered and to compare these design methods for various arched structures. Verification of the in-plane buckling of an arch is explained in detail.
APA, Harvard, Vancouver, ISO, and other styles
29

Ding, Jiawei, Xinkui Xing, Wei Yu, and Wanxu Zhu. "Study on the Axial Compression Postbuckling Similitude Model of the Stiffened Cylindrical Shell with Dimple Imperfections." Advances in Civil Engineering 2021 (April 20, 2021): 1–17. http://dx.doi.org/10.1155/2021/6637891.

Full text
Abstract:
The body of the new-type dry gas holder is a large stiffened cylindrical shell. Limited by the test site and economic conditions, the buckling characteristics of such holders are generally studied through scale model experiments. Taking the longitudinal-ring rectangular stiffened cylindrical shell as the research object, the generalized similitude condition and scaling principle formula of the structure are derived innovatively based on Donnell’s assumption and the energy method. By means of displacement loading and node coordinates updating, dimple imperfections are introduced into the ideal structure of the stiffened cylindrical shell, and then, the complete similitude and partial similitude analysis of axial compression nonlinear buckling for imperfect structures are carried out. The analysis results show that the complete similitude analysis of stiffened cylindrical shell axial-compression nonlinear buckling can be realized accurately; the partial similitude model for stiffened cylindrical shell axial-compression nonlinear buckling can better predict the buckling characteristics of its prototype structures, and the closer the Poisson’s ratio between the model and the prototype materials is, the more accurate the prediction results are. Meanwhile, the generalized similitude condition and scaling principle formula derived based on the energy method can provide useful reference for the model design and experimental verification of the axial compression buckling of the stiffened cylindrical shell with local geometric imperfections.
APA, Harvard, Vancouver, ISO, and other styles
30

Karmazínová, Marcela, and Jindrich Melcher. "Actual Effects of Local Buckling of Thin-Walled Metal Roof Decking: Control Experimental Verification Performed during Structure Realization." Applied Mechanics and Materials 368-370 (August 2013): 1503–6. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.1503.

Full text
Abstract:
Experimental verification of structural members can be the necessary part of the structural design of load-carrying civil structures, mainly in the period of last two decades. In some cases, the knowledge obtained from the tests is the sole source of the reliable information about actual behaviour of structural member in strain and failure process and about its objective load-carrying capacity. The paper is specifically aimed at the control experimental verification of roof decking based on thin-walled metal profiled sheets. Loading test has been performed during structure erection, as additional resource for the verification of actual behaviour and objective load-carrying capacity and for the confirmation or refinement of static design assumptions and results, within the ultimate and serviceability limit states. The subject of the control experimental verification was roof decking composed of thin-walled metal cassettes with thermal insulation at its upper side, used for the university lecture room roofing.
APA, Harvard, Vancouver, ISO, and other styles
31

Baumgardt, Guilherme Ribeiro, Thiago da Silveira, João Paulo Lima, Luiz Alberto Oliveira Rocha, Elizaldo Domingues dos Santos, and Liércio André Isoldi. "Verification of Finite Element Computational Model for Biaxial Buckling of Stiffened Plates." IOP Conference Series: Materials Science and Engineering 1150, no. 1 (May 1, 2021): 012023. http://dx.doi.org/10.1088/1757-899x/1150/1/012023.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Hansen, Thomas. "04.06: Post-buckling strength of plate girders subjected to shear: Experimental verification." ce/papers 1, no. 2-3 (September 2017): 858–67. http://dx.doi.org/10.1002/cepa.126.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Thangaratnam, Kari, and R. Sanjana. "Nonlinear Analysis of Composite Plates and Shells Subjected to In-Plane Loading." Applied Mechanics and Materials 877 (February 2018): 341–46. http://dx.doi.org/10.4028/www.scientific.net/amm.877.341.

Full text
Abstract:
In this article, nonlinear analysis of the composite plates and shells were carried out using the semiloof shell element. The finite element formulation is based on Green strains and Piola-Kirchhoff stresses. The nonlinear solution procedure was implemented to study the nonlinear behaviour of composite plates and shells. Due to coupling effect in composite plate and shells under in-plane load, pre-buckling displacement is significant and hence the behaviour is nonlinear. A verification study has been carried out to establish the efficiency of the present model. Since the margin of factor of safety is less in aerospace application, the detailed understanding and study of pre-buckling displacement is necessary for the designer.
APA, Harvard, Vancouver, ISO, and other styles
34

Redekop, D., and T. Muhammad. "Analysis of Toroidal Shells Using the Differential Quadrature Method." International Journal of Structural Stability and Dynamics 03, no. 02 (June 2003): 215–26. http://dx.doi.org/10.1142/s0219455403000860.

Full text
Abstract:
In new applications of toroidal shells it is often necessary to solve problems of statics, response, vibration, and buckling. While the finite element method can serve as the main means of analysis it is desirable to have available a second, complementary, method that can be used for verification, parametric studies, and specialized analyses. In this paper the use of the new differential quadrature method in such a complimentary role is investigated. Problems involving the statics, response, vibration, and buckling of toroidal shells are analyzed. Numerical results obtained are compared with finite element calculations. Finally conclusions are drawn concerning the agreement between the methods, and the usefulness of the new method for specialized studies.
APA, Harvard, Vancouver, ISO, and other styles
35

Xiangyu, Duan, Zhu Liqiang, Yu Zujun, and Xu Xining. "The Verification of Rail Thermal Stress Measurement System." Periodica Polytechnica Transportation Engineering 48, no. 1 (April 16, 2019): 45–51. http://dx.doi.org/10.3311/pptr.12062.

Full text
Abstract:
Continuous Welded Rail (CWR) is widely used in modern railways. With the absence of the expansion joints, CWR cannot expansion freely when the temperature changes, which could cause buckling in hot weather or breakage in cold weather. Therefore, rail thermal stress measuring system plays an important role in the safe operation of railways. This paper designed a thermal stress measurement system based on the acoustoelastic effect of the ultrasonic guided wave. A large-scale rail testbed was built to simulate the thermal stress in the rail track, and to establish the relationship of time-delay of guided wave and thermal stress. After laboratory testing, the system was installed in several railway lines in China for field tests. The results showed that the system was stable and accurate in stress measurement. The performance and potentials of the system were discussed.
APA, Harvard, Vancouver, ISO, and other styles
36

Kadari, Belkacem, Aicha Bessaim, Abdelouahed Tounsi, Houari Heireche, Abdelmoumen Anis Bousahla, and Mohammed Sid Ahmed Houari. "Buckling Analysis of Orthotropic Nanoscale Plates Resting on Elastic Foundations." Journal of Nano Research 55 (November 2018): 42–56. http://dx.doi.org/10.4028/www.scientific.net/jnanor.55.42.

Full text
Abstract:
This work presents the buckling investigation of embedded orthotropic nanoplates by using a new hyperbolic plate theory and nonlocal small-scale effects. The main advantage of this theory is that, in addition to including the shear deformation effect, the displacement field is modeled with only three unknowns and three governing equation as the case of the classical plate theory (CPT) and which is even less than the first order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT). A shear correction factor is, therefore, not required. Nonlocal differential constitutive relations of Eringen is employed to investigate effects of small scale on buckling of the rectangular nanoplate. The elastic foundation is modeled as two-parameter Pasternak foundation. The equations of motion of the nonlocal theories are derived and solved via Navier's procedure for all edges simply supported boundary conditions. The proposed theory is compared with other plate theories. Analytical solutions for buckling loads are obtained for single-layered graphene sheets with isotropic and orthotropic properties. The results presented in this study may provide useful guidance for design of orthotropic graphene based nanodevices that make use of the buckling properties of orthotropic nanoplates. Verification studies show that the proposed theory is not only accurate and simple in solving the buckling nanoplates, but also comparable with the other higher-order shear deformation theories which contain more number of unknowns. Keywords: Buckling; orthotropic nanoplates; a simple 3-unknown theory; nonlocal elasticity theory; Pasternak’s foundations. * Corresponding author; Email-tou_abdel@yahoo.com
APA, Harvard, Vancouver, ISO, and other styles
37

Bajurko, Piotr, and Przemysław Dobrzański. "Experimental Verification of Numerical Calculations with the Use of Digital Image Correlation." Transactions on Aerospace Research 2018, no. 2 (June 1, 2018): 1–15. http://dx.doi.org/10.2478/tar-2018-0011.

Full text
Abstract:
Abstract The article presents the results of research work performed under the TEBUK project, aiming primarily to develop a reference methodology for assessing the impact of damage on the strength of structures made of carbon epoxy prepregs. The tests described in the paper were concerned with a fragment of the structure (FS) of the TEBUK project demonstrator, made of carbon epoxy composite, with an artificial circular delamination measuring 40 mm in diameter. Numerical and experimental test of FS have been performed under quasi-static compression load. The buckling of the skin observed in the delamination area, as well as the propagation of the latter were investigated. The numerical calculations have been performed with the use of the commercially available MSC Marc/Mentat calculation suite based on the Finite Elements Methods. Results of the numerical calculations have been compared with experimental measurements made with the use of the Digital Image Correlation (DIC) method. The tests performed aimed to provide a preliminary verification of the numerical model. The results obtained have shown a very good correlation between the numerical and experimental results concerned with critical load levels at which stability of the layers separated by delamination is lost (buckling). The lack of convergence of the numerical model’s results after exceeding the critical load values has rendered it impossible to unequivocally compare the results concerned with propagation of the delamination area.
APA, Harvard, Vancouver, ISO, and other styles
38

Yang, Ji-Hou, Xiao-Dong Yang, Qing-Kai Han, and Jin-Guo Liu. "Post-Buckling Spring Vibration Isolator Using Silicone Gel Column: A Theoretical and Experimental Study." Applied Sciences 11, no. 22 (November 10, 2021): 10559. http://dx.doi.org/10.3390/app112210559.

Full text
Abstract:
Based on the design of a post-buckling silicone gel column (SGC), a novel type of low-frequency vibration isolator is presented, and the vibration isolation performance of this isolator is studied by combining theoretical analysis and experimental verification. The stiffness characteristics of the post-buckling SGC are derived, and its recovery force curves with different parameters are analyzed using two kinds of elliptic integral functions. Displacement transmissibility is formulated using harmonic balance method (HBM), and the influences of the excitation amplitude, damping ratio, SGC section diameter, and Young’s modulus are discussed in terms of the transmissibility. The performance of the SGC system is verified through a series of experimental studies based on the developed experimental prototype. The result shows that the proposed post-buckling spring vibration isolator has a good vibration isolation effect, especially in the low-frequency domain, which may provide a feasible novel design idea for a low-frequency vibration isolator.
APA, Harvard, Vancouver, ISO, and other styles
39

Bedia, Wafa Adda, Mohammed Sid Ahmed Houari, Aicha Bessaim, Abdelmoumen Anis Bousahla, Abdelouahed Tounsi, Tareq Saeed, and Mohammed S. Alhodaly. "A New Hyperbolic Two-Unknown Beam Model for Bending and Buckling Analysis of a Nonlocal Strain Gradient Nanobeams." Journal of Nano Research 57 (April 2019): 175–91. http://dx.doi.org/10.4028/www.scientific.net/jnanor.57.175.

Full text
Abstract:
In present paper, a novel two variable shear deformation beam theories are developed and applied to investigate the combined effects of nonlocal stress and strain gradient on the bending and buckling behaviors of nanobeams by using the nonlocal strain gradient theory. The advantage of this theory relies on its two-unknown displacement field as the Euler-Bernoulli beam theory, and it is capable of accurately capturing shear deformation effects, instead of three as in the well-known first shear deformation theory and higher-order shear deformation theory. A shear correction factor is, therefore, not needed. Equations of motion are obtained via Hamilton’s principle. Analytical solutions for the bending and buckling analysis are given for simply supported beams. Efficacy of the proposed model is shown through illustrative examples for bending buckling of nanobeams. The numerical results obtained are compared with those of other higher-order shear deformation beam theory. The results obtained are found to be accurate. Verification studies show that the proposed theory is not only accurate and simple in solving the bending and buckling behaviour of nanobeams, but also comparable with the other shear deformation theories which contain more number of unknowns
APA, Harvard, Vancouver, ISO, and other styles
40

Cobianchi, Mattia, and Christopher Spear. "Modelling and visualization of surround buckling in electrodynamic audio transducers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 265, no. 1 (February 1, 2023): 6058–69. http://dx.doi.org/10.3397/in_2022_0904.

Full text
Abstract:
The surround (or front-suspension) of electrodynamic transducers typically used in loudspeakers and headphones is a device that provides the axial restoring force for the diaphragm movement and restrains the lateral and tilting movements. A non-linear phenomenon typical of surrounds is pressure-induced buckling, a sudden change in the shape of the surround under load. The question addressed by this paper is how to predict the conditions under which a surround will buckle, and how to measure and visualize it in physical prototypes. The modelling methodology was based on structural finite-element analysis, while the measurement of transducer displacement and video recording with a high-speed camera allowed the experimental verification. This methodology has been applied and tested on semi-circular rubber surrounds. The impact of working temperature and manufacturing tolerances are also discussed. It was found that it's possible to predict the pressure threshold triggering a specific buckling mode within a 10% error. Full 3D modelling is advisable to assess the buckling pressure of non-axisymmetric modes common in real transducers. At the same time, 2D modelling has been proven enough for the evaluation of the worst-case scenario / lowest buckling pressure.
APA, Harvard, Vancouver, ISO, and other styles
41

Hsu, W. H., M. C. Chou, and H. Y. Tsai. "Design and Fabrication of Anisotropic Conductive Film for Application of Probe Card." Journal of Mechanics 33, no. 5 (April 10, 2017): 655–61. http://dx.doi.org/10.1017/jmech.2017.18.

Full text
Abstract:
AbstractPrior to integrated circuit (IC) packaging, die performance must be verified using probe cards to screen for defective products. With the decrease in IC line width, the dimensions of the pads used for performance verification and the spacing between adjacent pads have also decreased. However, when the pad pitch is reduced to less than 30 μm, commonly used probe cards will face manufacturing problems in miniaturization. To resolve probe card manufacturing problems caused by the miniaturization of IC components, the use of an anisotropic conductive film (ACF) in probe cards was proposed in this study. Theoretical calculations and experimental testing of this probe structure were conducted to demonstrate the feasibility of this concept.In theoretical calculations, composite material and buckling theory were utilized to evaluate the buckling behavior of the ACF. In experimental testing, photolithography and electroplating techniques were used to control the line width and spacing intervals of the micron-scale metal wires in the ACF. After the ACF was fabricated, the mechanical properties of the ACF during wafer testing were assessed. Theoretical analyses and experimental testing verified that ACFs can potentially be applied to the performance verification of IC products. In the ACF structure, multiple probes came into contact with each pad. Therefore, ACFs can potentially be applied to the performance verification of IC components with pad diameters of less than 20 μm. The results of this study directly benefit the miniaturization of ICs.
APA, Harvard, Vancouver, ISO, and other styles
42

Zhang, Zechao, Hongbo Liu, and Zhihua Chen. "Lateral Buckling Theory and Experimental Study on Pipe-in-Pipe Structure." Metals 9, no. 2 (February 4, 2019): 185. http://dx.doi.org/10.3390/met9020185.

Full text
Abstract:
With the increasing depth of marine oil and gas exploitation, more requirements have been proposed on the structure of deep-sea oil pipelines. The influencing factors of lateral buckling of a pipe-in-pipe (PIP) structure containing initial imperfections and its critical force were investigated in this study by conducting an experiment, a finite element analysis, and a theoretical derivation. The change laws on the influence of initial imperfections of the PIP structure during thermal loading were revealed through an experimental study by using imperfection amplitude and wavelength as parameters. Appropriate finite element models were established, and the influences of initial imperfections, pipe-soil interaction, and the height and the number of centralizers on the global buckling critical force of the PIP structure were analyzed. The formulas of global buckling critical force of inner and outer pipes and that under pipe-soil interaction was obtained by using a theoretical derivation method. A comparative verification with experimental and finite element (FE) models result was conducted, which provided a corresponding basis for steel pipeline design.
APA, Harvard, Vancouver, ISO, and other styles
43

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
44

Bigoni, D., D. Misseroni, G. Noselli, and D. Zaccaria. "Effects of the constraint's curvature on structural instability: tensile buckling and multiple bifurcations." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2144 (March 7, 2012): 2191–209. http://dx.doi.org/10.1098/rspa.2011.0732.

Full text
Abstract:
Bifurcation of an elastic structure crucially depends on the curvature of the constraints against which the ends of the structure are prescribed to move, an effect that deserves more attention than it has received so far. In fact, we show theoretically and provide definitive experimental verification that an appropriate curvature of the constraint over which the end of a structure has to slide strongly affects buckling loads and can induce: (i) tensile buckling; (ii) decreasing- (softening), increasing- (hardening) or constant-load (null stiffness) postcritical behaviour; and (iii) multiple bifurcations, determining for instance two bifurcation loads (one tensile and one compressive) in a single-degree-of-freedom elastic system. We show how to design a constraint profile to obtain a desired postcritical behaviour and we provide the solution for the elastica constrained to slide along a circle on one end, representing the first example of an inflexional elastica developed from a buckling in tension. These results have important practical implications in the design of compliant mechanisms and may find applications in devices operating in quasi-static or dynamic conditions, even at the nanoscale.
APA, Harvard, Vancouver, ISO, and other styles
45

Leach, P., and J. M. Davies. "An experimental verification of the generalized beam theory applied to interactive buckling problems." Thin-Walled Structures 25, no. 1 (May 1996): 61–79. http://dx.doi.org/10.1016/0263-8231(95)00031-3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Totaro, G., F. De Nicola, and P. Caramuta. "Local buckling modelling of anisogrid lattice structures with hexagonal cells: An experimental verification." Composite Structures 106 (December 2013): 734–41. http://dx.doi.org/10.1016/j.compstruct.2013.07.031.

Full text
APA, Harvard, Vancouver, ISO, and other styles
47

Akbar, Rajawali M., and Bambang Suryoatmono. "Numerical study of inelastic buckling behavior of rectangular steel plates with circular openings under shear forces." MATEC Web of Conferences 258 (2019): 05026. http://dx.doi.org/10.1051/matecconf/201925805026.

Full text
Abstract:
Cellular steel beam is flanged steel beam with circular openings of uniform diameter and distance between each opening. The main benefit of such beam is to reduce the structural weight without reducing the strength significantly. A rectangular steel plate with circular opening is frequently used as a model of a web panel of such beam with vertical web stiffeners. The dimension of the plate is the dimension of the web bounded by top and bottom flanges and two adjacent vertical stiffeners. In this research, finite element method is utilized to perform inelastic buckling analyses of rectangular steel plates with circular openings under shear forces along all four edges assuming steel as elastic-perfectly-plastic material with yield stress of 250 MPa. Both nonlinear geometry and nonlinear material are considered in the analyses. The objective of this research is to study buckling behavior of the plate in terms of buckling mode, critical load, and Von Mises (effective) stress distribution. The buckling shear loads of the plates of various length-to-width ratios of the plate (1.0, 1.25, and 1.50) and various opening-diameter-to-plate-width ratios (0.00, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50) have been obtained from the analyses. The deformation and Von Mises stress distribution at every load level have been obtained as well from the finite element analyses. Equation to predict inelastic buckling shear force of a rectangular steel plates with circular opening under shear forces is proposed in this study. Verification of the method has been performed by comparing shear buckling loads resulted from finite element analyses with the analytical results in the elastic range.
APA, Harvard, Vancouver, ISO, and other styles
48

Escalera Mendoza, Alejandra S., D. Todd Grifth, Chris Qin, Eric Loth, and Nick Johnson. "Rapid approach for structural design of the tower and monopile for a series of 25 MW offshore turbines." Journal of Physics: Conference Series 2265, no. 3 (May 1, 2022): 032030. http://dx.doi.org/10.1088/1742-6596/2265/3/032030.

Full text
Abstract:
Abstract The goal of further reducing the Levelized Cost of Energy (LCOE) has driven the investigation of large-scale wind turbines. This work presents a simple, rapid and detailed approach for the structural design of the tower and monopile without a controller, but with frequency and high fidelity structural verification. The approach uses an optimization to reduce the mass of the structures while meeting strength, buckling and geometric constraints by using analytical equations. A verification of frequency constraints is performed with BModes, and ANSYS Mechanical APDL is used for high fidelity verification of stress and buckling. The approach is applied to study the design space of three 25 MW offshore wind turbines with different rotor diameters and cone angles, and to evaluate the nacelle center of mass fore-aft location effect. Results obtained show that the tower and monopile are more susceptible to changes in the rotor thrust than the overturning moment even for designs with high pre-cone angle and large distance of the nacelle center of mass from the tower axis. But it is possible to obtain structurally feasible tower and monopile designs for the three 25 MW turbines studied while not exceeding diameter and wall thickness limits. However, mass penalties can be decreased by 0.8-14%, to further reduce the cost of energy, by increasing the diameter limit which may require manufacturing technology development. The approach applied and studies serve to understand the design space of the tower and monopile for a 25 MW turbine, and provide baseline designs that can be used in the development of a controller and evaluation of a full suite of design load cases.
APA, Harvard, Vancouver, ISO, and other styles
49

ABAKUMOV, A. I., G. A. KVASKOV, V. P. SOLOVYEV, V. V. SINITSYN, and H. P. WALTHER. "AN EXPERIMENTAL STUDY OF BUCKLING OF CYLINDRICAL SHELLS SUBJECTED TO STATIC AND DYNAMIC AXIAL IMPACT." International Journal of Modern Physics B 22, no. 09n11 (April 30, 2008): 1369–76. http://dx.doi.org/10.1142/s0217979208046797.

Full text
Abstract:
To study structure resistance to impact loads using thin-wall cylinder units, knowledge of energy absorption parameters of these test units is required, as well as evaluations of resistance force. Buckling of cylinder test units involves formation of both axisymmetric and non-axisymmetric folds. Repeatability of buckling patterns is an important parameter of the fold formation process and, eventually, of the absorbed energy magnitude. This paper discusses buckling patterns obtained for cylinder test units of three dimension types with scales relating as 1:2:10. The units were made of three materials (steel 09G2C and two aluminum alloys, AMg6 and AMcM) and subjected to static and impact loading. For static loading, a test unit was fixed on a long measuring rod and subjected to an impact by a projectile moving at a speed of V0. The experiments were performed at three loading speeds V0 10m/s, 50 m/s, 100 m/s. No less than 5-10 tests were performed for each type of test units, i.e. for each size, material and load level, to study buckling repeatability. Impact velocity and axial compression force history were recorded in the tests. It was obtained in the testing of cylinder test units that: Repeatability of buckling patterns was observed only in the formation of the first fold, which is axisymmetric. Then buckling, in most cases, follows a non-axisymmetric path; -With test unit scale (i.e. size) increasing, its relative energy absorption capacity under impact loading (in ratio to the test unit mass) increases; - There is clear evidence that strain rate influences the material strength properties, except for the aluminum alloy AMg6, whose strength properties depend rather weakly on strain rate. These experimental findings can be used as a benchmark for verification of computer codes, as well as to study the behaviors of cylinder test units subjected to axial impact, which involve both axisymmetric and non-axisymmetric buckling shapes.
APA, Harvard, Vancouver, ISO, and other styles
50

PIASSI, A. D., J. V. DIAS, A. F. G. CALENZANI, and F. C. C. MENANDRO. "Lateral distortional buckling of cellular composite-beams." Revista IBRACON de Estruturas e Materiais 11, no. 2 (April 2018): 331–56. http://dx.doi.org/10.1590/s1983-41952018000200007.

Full text
Abstract:
Abstract In the region of negative bending moments of continuous and semi-continuous steel and concrete composite beams, the inferior portion of the steel section is subjected to compression while the top flange is restricted by the slab, which may cause a global instability limit state know as lateral distortional buckling (LDB) characterized by a lateral displacement and rotation of the bottom flange with a distortion of the section’s web when it doesn’t have enough flexural rigidity. The ABNT NBR 8800:2008 provides an approximate procedure for the verification of this limit state, in which the resistant moment to LDB is obtained from the elastic critical moment in the negative moment region. One of the essential parameters for the evaluation of the critical moment is the composite beam’s rotational rigidity. This procedure is restricted only to to steel and concrete composite beams with sections that have plane webs. In this paper, an equation for the calculation of the rotational rigidity of cellular sections was developed in order to determine the LDB elastic critical moment. The formulation was verified by numerical analyses performed in ANSYS and its efficiency was confirmed. Finally, the procedure described in ABNT NBR 8800:2008 for the calculation of the critical LDB moment was expanded to composite beams with cellular sections in a numerical example with the appropriate modifications in geometric properties and rotational rigidity.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography