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Relevant bibliographies by topics / Tubes][Structural collapse

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Academic literature on the topic 'Tubes][Structural collapse'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Tubes][Structural collapse"

1

Mai, S. P., and N. A. Fleck. "Reticulated tubes: effective elastic properties and actuation response." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2103 (2008): 685–708. http://dx.doi.org/10.1098/rspa.2008.0328.

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The structural performance is explored for a reticulated circular tube made from a periodic lattice: triangulated; hexagonal; Kagome; and square lattices. The finite-element (FE) method is used to determine the macroscopic bending, torsional and axial rigidities of each tube. Additional insight is obtained by examining the structural mechanics of the pin-jointed version of each topology. For all pin-jointed lattices considered, no states of self-stress exist. However, collapse mechanisms do exist for all reticulated tubes, and for the Kagome and hexagonal lattices some of these mechanisms produce macroscopic generalized strain. These strain-producing collapse modes are additional to those observed in the planar version of these lattices. Consequently, the structural rigidities of tubes with walls made from the rigid-jointed Kagome lattice or hexagonal lattice are less than those predicted from the in-plane effective properties of these two lattices. The morphing capacity of reticulated tubes is also explored by replacing a single bar with an actuator in the FE simulations. The actuation stiffness of the structure is defined by the stiffness of the reticulated tube in resisting extension by the actuated bar. The actuation stiffness is explored as a function of the type of lattice, number of unit cells around the circumference, orientation of the actuated bar and of the bar stockiness. In all cases, the macroscopic shape change of the tube can be idealized as a combination of a local rotation, axial extension, axial twist and shear displacement of the cross-section.

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Alkhatib, Sami E., Faris Tarlochan, and Arameh Eyvazian. "Collapse behavior of thin-walled corrugated tapered tubes." Engineering Structures 150 (November 2017): 674–92. http://dx.doi.org/10.1016/j.engstruct.2017.07.081.

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Elchalakani, Mohamed, Raphael Grzebieta, and Xiao-Ling Zhao. "Plastic Collapse Analysis of Slender Circular Tubes Subjected to Large Deformation Pure Bending." Advances in Structural Engineering 5, no. 4 (2002): 241–57. http://dx.doi.org/10.1260/136943302320974617.

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This paper presents a plastic mechanism analysis for thin-walled circular hollow section (CHS) tubes deforming in a multi-lobe or diamond collapse mode under large deformation pure bending. The fold formation process was such that the shell curvature flattened on the compression side transforming into a definite number of flat triangles attached to each other. The collapse proceeded progressively by folding about the base and sides of these triangular planes and over traveling hinge lines. The collapse mechanism was similar to the diamond crush mode. An existing kinematic model for an axially compressed thin-walled circular tube was modified to predict the collapse curve of a thin-walled tube under bending. Inextensional deformation and rigid plastic material behaviour were assumed in the derivation of the deformation energy. Ovalisation was observed during the test and its deformation energy was determined and found significant. An expression for the plastic collapse moment was obtained by equating the total energy absorbed in bending, rolling and ovalisation to the external work carried out during a given cycle of deformation. Comparisons of the predicted post-buckling moments and slopes of the collapse curves with those obtained from experiments carried out by the authors on cold-formed circular hollow sections show very good agreement.

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Veillette, J. R., and J. F. Carney. "Collapse of braced tubes under impact loads." International Journal of Impact Engineering 7, no. 2 (1988): 125–38. http://dx.doi.org/10.1016/0734-743x(88)90021-8.

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Subramaniyan, S. Kanna, Shahruddin Mahzan, Mohd Imran Ghazali, Ahmad Mujahid Ahmad Zaidi, and Prasath Kesavan Prabagaran. "Energy Absorption Characteristics of Polyurethane Composite Foam-Filled Tubes Subjected to Quasi-Static Axial Loading." Applied Mechanics and Materials 315 (April 2013): 872–78. http://dx.doi.org/10.4028/www.scientific.net/amm.315.872.

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Foam-filled enclosures are very common in structural crashworthiness to increase energy absorption. However, very less research has been targeted on potential use of natural/recycled material reinforced foam-filled tubes. Therefore, an experimental investigation was performed to quantify energy absorption capacity of polyurethane (PU) composite foam-filled circular steel tubes under quasi-static axial loading. The thickness of the tubes was varied from 1.9, 2.9 and 3.6 mm. The tubes were filled with PU composite foam. The PU composite foam was processed with addition of kenaf plant fiber and recycled rubber particles that were refined at 80 mesh particulates into PU system. The density of PU resin was varied from 100, 200 and 300 kgm-3. The PU composite foam-filled tubes were crushed axially at constant speed in a universal testing machine and their energy absorption was characterized from the resulting load-deflection data. Results indicate that PU composite foam-filled tubes exhibited better energy absorption capacity than those PU foam-filled tubes and its respective empty tubes. Interaction effect between the tube and the foam and incorporation of filler into PU system led to an increase in mean crushing load compared to that of the unfilled PU foam or tube itself. Relatively, progressively collapse modes were observed for all tested tubes. Findings suggested that composite foam-filled tubes could be used as crashworthy member.

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Kim, Dae Yun, You Na Lee, Joon Han Kim, Yonghee Kim, and Young Soo Yoon. "Applicability of Swaging as an Alternative for the Fabrication of Accident-Tolerant Fuel Cladding." Energies 13, no. 12 (2020): 3182. http://dx.doi.org/10.3390/en13123182.

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We suggest an alternative to conventional coating methods for accident-tolerant fuel (ATF) cladding. A Zircaloy-4 tube was inserted into metal tubes of different materials and the inserted tubes were subjected to physical force at room temperature. The manufactured tube exhibited a pseudo-single tube (PST) structure and had higher thermal stability than a Zircaloy-4 tube. Optical microscopy and scanning electron microscopy images showed that the PST had a uniform and well-bonded interface structure, i.e., no gaps or voids were found at the interface between the inner and outer tubes. Energy-dispersive X-ray spectroscopy analysis confirmed that the metal components did not interdiffuse at the interface of the PST, even after being kept at 600 and 900 °C for 1 h and rapidly cooled to room temperature. Unlike pure Zircaloy-4 tubes, Zircaloy-4/stainless use steel (SUS) 316 PST did not show significant structural collapse, even after being stored at 1200 °C for 1 h. Based on these results, if a PST was fabricated using a Zircaloy-4 tube thinner than the Zircaloy-4 tube used in this study and an outer tube of micron-scale thickness, swaging may be a feasible alternative to Zircaloy-4-based ATF cladding.

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YASUI, Yoshiaki, Shigeru WADA, and Tsuneo IMAI. "521 Impact Collapse Characteristic of Thin-walled Structural Tubes with Various Reinforced Ribs." Proceedings of Autumn Conference of Tohoku Branch 2005.41 (2005): 217–18. http://dx.doi.org/10.1299/jsmetohoku.2005.41.217.

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Tang, D. S., L. C. Chen, L. J. Wang, et al. "Behavior of carbon nanotubes under high pressure and high temperature." Journal of Materials Research 15, no. 2 (2000): 560–63. http://dx.doi.org/10.1557/jmr.2000.0083.

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The structural changes of carbon nanotubes induced by high pressure and high temperature were investigated by means of x-ray diffraction, Raman scattering, scanning electron microscopy, and transmission electron microscopy. It is shown that, with increasing pressure and temperature, the lattice constant d002 of tubes shortens, and then tubes collapse into tapelike ones; at the same time the C–C bonds at high curvature break, which lead the tapelike tubes to break into graphite sheets as diamond crystallization centers. Compared with graphite, the diamond particles from carbon nanotubes have many defects as the trace of tubes.

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Park, M. S., and B. C. Lee. "Prediction of Mode Parameters and Moment-Rotation Curves for Crushed Thin-Walled Trapezoidal Tubes in Bending." Journal of Applied Mechanics 63, no. 2 (1996): 453–59. http://dx.doi.org/10.1115/1.2788889.

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In the context of kinematic models, a general procedure for the bending crush analysis of thin-walled members is proposed and applied to the trapezoidal and rectangular tubes in bending. The main emphasis of this study is given to the determination of collapse mode parameters and the prediction of post-collapse behaviors of the structural member. The mode shapes are determined by minimizing plastic energy rate of the members. Moment-rotation curves are obtained by differentiating the absorbed plastic energy with respect to the rotation angle. For small rotation angles the solution is modified by considering elastic buckling and plastic collapse moments. Through several examples a full range of post-collapse response of the thin-walled members is shown to be effectively calculated by the proposed method without making any recourse to experimental data.

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Gupta, N. K., and S. K. Sinha. "Transverse collapse of thin-walled square tubes in opposed loadings." Thin-Walled Structures 10, no. 3 (1990): 247–62. http://dx.doi.org/10.1016/0263-8231(90)90067-9.

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Dissertations / Theses on the topic "Tubes][Structural collapse"

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Birch, R. S. "The dynamic and static plastic collapse of structural members incorporating axial stiffening." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234846.

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Books on the topic "Tubes][Structural collapse"

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Collapse of composite tubes under end moments. National Aeronautics and Space Administration, Langley Research Center, 1992.

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Book chapters on the topic "Tubes][Structural collapse"

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Nomoto, T., and M. Enosawa. "Collapse, Progressive Buckling and Fatigue Strength of Cylindrical Tubes in Offshore Structures." In Computational Mechanics ’86. Springer Japan, 1986. http://dx.doi.org/10.1007/978-4-431-68042-0_79.

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Kelly, John F. "Some Geometric and Component Interaction Effects during the Axial Collapse of Glass/Polyester Tubes at Force Levels Compatible with Rail Vehicle Design." In Composite Structures 5. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1125-3_19.

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Bignell, Paul, David Thambiratnam, and Frank Bullen. "Unified Theory for Collapse of Thin Rectangular Tubes under Compression." In Structural Failure and Plasticity. Elsevier, 2000. http://dx.doi.org/10.1016/b978-008043875-7/50190-8.

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Kim, C. W., B. K. Han, and C. H. Jeong. "Unified theory for collapse of thin rectangular tubes under compression." In Structural Failure and Plasticity. Elsevier, 2000. http://dx.doi.org/10.1016/b978-008043875-7/50191-x.

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Stamper, Robert L. "Hypotony Maculopathy." In Complications of Glaucoma Surgery. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780195382365.003.0037.

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Hypotony is often defined as intraocular pressure (IOP) less than 6 mm Hg. It has been reported to occur after glaucoma filtering surgery in up to 42% of cases and is usually associated with overfiltration or wound leaks. Hypotony requiring revision, however, occurs in about 4% of filtering procedures. Hypotony can follow any IOP-lowering procedure or even “simple” cataract surgery. The advent of guarded filtering surgery has reduced the rate of hypotony significantly compared to full-thickness filtering surgery. Unfortunately in the quest to increase success rates by using adjunctive antifibrotic agents, such as mitomycin-C (MMC) or 5-fluorouracil (5-FU), that prevent fibrotic wound healing, the incidence has increased again. Higher doses of and longer exposure times to MMC are associated with a greater risk of hypotony. Most cases of hypotony are transient and self-limited to a few days or weeks after surgery. Transient hypotony does not seem to have any deleterious effect on long-term visual acuity. However, persistent hypotony may result in structural changes that can become permanent. Hypotony maculopathy is one such condition manifesting from persistent hypotony that can result in permanent vision loss. Hypotony maculopathy occurs in up to 10% of filtering operations with MMC or 5-FU and in about 10% of eyes with chronic hypotony. Maculopathy associated with hypotony was first described by Dellaporta. Some years later, Gass, using fluorescein angiography, better characterized the condition. In hypotony maculopathy, the sclera and choroid develop folds in the posterior pole, which can cause significant visual disturbances. The condition is recognized by characteristic striae or folds in the macular area that do not leak or stain with fluorescein. The posterior sclera appears partially collapsed, causing the folds. The axial length of the eye may be shortened after both filtering and tube shunt surgery and more so in patients with hypotony. The loss of vision is usually gradual after the hypotony has persisted for at least a month or more. Indocyanine green angiography has revealed some vascular abnormalities including vessel tortuosity and filling defects.

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Conference papers on the topic "Tubes][Structural collapse"

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STOCKWELL, ALAN, and PAUL COOPER. "Collapse of composite tubes under end moments." In 33rd Structures, Structural Dynamics and Materials Conference. American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-2389.

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Yuan, Yongbin, and Gary L. Viegelahn. "A New Model for Axisymmetric Collapse of Circular Tubes." In International Conference On Vehicle Structural Mechanics & Cae. SAE International, 1992. http://dx.doi.org/10.4271/921071.

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Mateus, Anto´nio F., and Joel A. Witz. "Collapse of Imperfect Corroded Steel Tubes." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37123.

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This paper presents the results of an investigation into the structural mechanics of corroded steel tubes and quantifies the discrepancies resulting from two approaches to modelling the effects of corrosion: uniform thickness reduction and quasi-random thickness. It is shown how the geometrical configuration of the tube’s corroded surface influences its strength under external pressure and how it may lead to collapse localisation phenomena.

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Todorovska-Azievska, L., and D. Kecman. "Multi-Axial Collapse of Rectangular Section Tubes and Its Modelling in Finite Element Analysis." In International Conference on Vehicle Structural Mechanics. SAE International, 1988. http://dx.doi.org/10.4271/880896.

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Jiao, R., and S. Kyriakides. "Progressive Wrinkling and Collapse of Pipes Due to Axial Cycling." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79754.

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Pipelines buried in trenches and covered by soil are essentially under full axial constraint. Under such conditions, a temperature change resulting from the passage of hot oil coupled with high internal pressure can plastically deform the pipe. If the line is relatively thin the compression can induce axisymmetric wrinkling. Mild wrinkling is benign, but at higher strain levels it leads to collapse by localized wrinkling. During a lifetime of 20 or more years, lines experience many startup and shutdown cycles (∼100). This work investigates whether a tube that develops small amplitude wrinkles can be subsequently collapsed by persistent cycling. The problem is investigated experimentally using SAF2507 super-duplex steel tubes with D/t of 28.5. The tubes are first compressed to strain levels high enough for mild wrinkles to form; they are then cycled axially under stress control about a compressive mean stress. This type of cycling usually results in material ratcheting; here it is accompanied by accumulation of structural damage due to the growth of the amplitude of the initial wrinkles. The tube average strain initially grows nearly linearly with the number of cycles, but as a critical value of wrinkle amplitude is approached, wrinkling localizes, ratcheting grows exponentially and the tube collapses. The rate of ratcheting and the number of cycles to failure depend on the initial compressive pre-strain and on the amplitude of the stress cycles. However, collapse was found to occur when the accumulated average strain reaches the value at which the tube localizes under monotonic compression. A custom shell model of the tube with initial axisymmetric imperfections, coupled to a cyclic plasticity model is used to simulate successfully the series of experiments performed.

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Hallai, Julian F., and Stelios Kyriakides. "Effect of Lu¨ders Bands on the Bending Capacity of Steel Tubes." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20982.

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In several offshore applications hot-finished pipe that often exhibits Lu¨ders bands is bent to strains of 2–3%. Lu¨ders banding is a material instability that leads to inhomogeneous plastic deformation in the range of 1–4%. It can precipitate structural instabilities and collapse of the pipe. Experiments and analysis are used to study the interaction of the prevalent structural instabilities under bending with Lu¨ders banding, with the objective of providing guidance to the designer. Pure bending experiments on tubes of various D/t values reveal that Lu¨ders bands result in the development of inhomogeneous deformation in the structure, in the form of coexistence of two curvature regimes. Under rotation controlled bending, the higher curvature zone(s) gradually spreads while the moment remains essentially unchanged. For relatively low D/t tubes with relatively smaller Lu¨ders strain, the whole tube eventually is deformed to the higher curvature, subsequently entering the usual hardening regime where it continues to deform uniformly until the expected limit state is reached. For higher D/t tubes and/or for materials with longer Lu¨ders strain, the structure collapses during the inhomogeneous deformation regime. This class of problems is analyzed using 3D finite elements and an elastic-plastic constitutive model with an up-down-up material response. It will be demonstrated that the solution procedure followed can simulate the experiments with consistency.

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Choi, Jun Hyeok, Seok Jun Kang, and Jae-Boong Choi. "Plastic Collapse Evaluation of Fuel Channel Assembly in Pressurized Heavy Water Reactor." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84463.

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400 fuel channel assemblies are there in a PHWR. Each assembly consist of a CT as outer tube, a PT as inner tube, and 4 GSs to prevent contact between two tubes. The fuel bundles, inserted into PT of fuel channel assembly, heat the coolant to high temperature by nuclear fission. Furthermore, the pressurizer compresses the coolant not to boil in high temperature. From this, high pressure and high temperature condition happened in the PT. So, the integrity of PTs needs to be guaranteed. Although large number of previous researches were performed, they assumed a PT as single tube and did not take into account the constrained effect. In actual behavior, PT contact with CT, GS or both. In addition, its structural shape made bending restraint effect to the PT. Since the contact force and bending restraint effect make limit in behavior of the PT, previous evaluation results are not accurate. In order to obtain more accurate result, it is needed for the PT to be modeled as fuel channel assembly including CT and GSs. For this, 3D FE model of fuel channel assembly is proposed and validated by comparing with previous creep analysis result in previous study. In this study, fracture mechanical FE analysis is conducted for the PHWR fuel channel with circumferential surface or through-wall crack at the PT. Parameters of PIP geometry and bending restraint effect which can apply to plastic collapse evaluation of the PHWR fuel channels are extracted.

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Liu, Yafei, and Stelios Kyriakides. "Effect of Reeling on Pipeline Structural Performance." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54866.

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The winding and unwinding of a pipeline in the reeling installation process involves repeated excursions into the plastic range of the material, which induce ovality and changes to the mechanical properties. We present two modeling schemes for simulating reeling/unreeling capable of capturing these changes and can be used to assess their impact on the structural performance of the pipeline in deeper waters. In the first model, the complete 3-D reeling process is simulated through a finite element model that includes proper treatment of contact and nonlinear kinematic hardening for plasticity. The second model includes the pipe geometric cross sectional nonlinearities, contact, and nonlinear kinematic hardening, but variations along the length of the line are neglected. Instead, an axially uniform curvature/tension loading history is applied that corresponds to that experienced by a point of the line during the process. The two models are used to simulate a set of experiments in which tubes were wound and unwound on a model reel at different values of tension. Both models are shown to reproduce the induced ovality and elongation very well. Several of the reeled tubes were subsequently tested under external pressure demonstrating the effect of the reeling cycle on structural performance. The two models are shown to also reproduce the decrease in collapse pressure as a function of the applied back tension. Comparison of the results of such simulations highlight when a fully 3-D model is required and when the simpler 2-D model is adequate for evaluating the structural performance of a reeled pipe.

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Nadri, Brahim, and Robert X. Wang. "A Structural Integrity Assessment of a Nuclear Boiler Superheater Bifurcation at High Temperature." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81167.

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Steam generating boilers in gas cooled nuclear reactors in the UK operate at high temperatures and some of them have been in service for more than 30 years and are now facing the challenges from long term operation extension demand. The tubular components experience surface metal losses due to exposure to oxidation and corrosive environment and as a result, some tubes suffer from restricted flow which may lead to an increased creep-fatigue crack initiation damage. To maintain or recover boiler heat transfer efficiency, internal chemical cleaning of selected boiler tubes is carried out, which introduces additional metal loss in the tube wall, weakening its load bearing capacity. Some boiler components are subject to high temperature, pressure and mechanical loadings in large number of operating cycles through life, introducing creep in addition to cyclic fatigue damage. In support of an operational safety case and plant long term operation extension requirements, structural integrity assessments have been carried out on a critical boiler component — bifurcation, taking into account tube wall metal loss for extended long term services, including the effects of possible future chemical cleaning operations. This paper presents the finite element analyses and R5 Volume 2/3 assessment work carried out for the structural integrity substantiation of a stainless steel boiler tube bifurcation. The bifurcation is a tubular component subject to significant applied displacement due to long range thermal expansion of the neighbouring components. The initial study following normal industry practice using a decoupled analysis approach showed that the strain ranges obtained would exceed the creep-fatigue crack initiation capacity and plastic ratchetting would occur which would lead to short term, incremental plastic collapse, hence a safety case could not be made. To meet the challenge, the analysis and assessment processes have been examined. A coupled FE analysis approach was used to remove the pessimism associated with the decoupled analysis approach. This approach captures the displacement-controlled nature of the system loads and allows a more realistic assessment. In addition, the plant life has been divided into a number of assessment periods such that the more realistic metal loss appropriate for each period could be used. Furthermore, segregated temperature zones have been considered in the assessment, leading to a significant reduction in the creep-fatigue crack initiation damage and a satisfactory extended long term operation safety case.

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Kim, Hyun Su, Chang Kyun Oh, and Tae Eun Jin. "A Comparison of Failure Load Assessment Methods for Thin-Walled Tubes With Cracks." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78142.

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Heat exchangers in fossil and nuclear power plants comprise thousands of thin-walled tubes. Operational experience shows that cracks have been frequently detected in the tubes. Since the structural integrity of the heat exchangers is crucial from the viewpoint of safety and reliability, the integrity evaluation of the cracked tubes is quite important. The failure modes of the cracked tubes are determined herein in accordance with Section XI of ASME Code. In addition, failure loads are evaluated using various methods and compared with test data in order to determine an optimum estimation method. The analysis results show that the failure mode of the cracked tubes is plastic collapse. Also, the predicted failure loads by finite element limit analyses agree very well with the corresponding test data, whereas the analytical approaches are significantly under predictive depending on the crack type and size. It is, therefore, considered that the finite element limit load approach can be applied to the practical integrity evaluation and the establishment of an optimum inspection strategy for managing the heat exchanger tubes.

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