Relevant bibliographies by topics / Fatigue limit state

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Fatigue limit state'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Fatigue limit state"

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Neuberg, Or, and Nitai Drimer. "Fatigue limit state design of fast boats." Marine Structures 55 (September 2017): 17–36. http://dx.doi.org/10.1016/j.marstruc.2017.05.002.

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Lotsberg, I. "Recent advances on fatigue limit state design for FPSOs." Ships and Offshore Structures 2, no. 1 (January 2007): 49–68. http://dx.doi.org/10.1533/saos.2006.0145.

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Zhang, Zhongke, Yang Yu, Huaxia Zhao, and Hui Tong. "Effect of Loading Methods on the Fatigue Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints." Materials 13, no. 19 (September 23, 2020): 4247. http://dx.doi.org/10.3390/ma13194247.

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The energy evolution, fatigue life and failure behaviour of dissimilar Al/steel keyhole-free Friction stir spot welding (FSSW) joints were studied under different fatigue loads. The absorption energy of fatigue fracture, the fracture mechanism and the sensitivity of the fatigue limits to the fatigue load parameters were analysed. It was found that the stress ratio R determines the fatigue limit Ff, while the fatigue limit Ff is not sensitive to the loading frequency. The high-frequency fatigue load will increase the displacement deformation μ and fatigue fracture absorption energy Ea of the spot-welded joint, which are larger under asymmetric fatigue loading than those under symmetrical fatigue loading. At the same time, the symmetrical fatigue load can form the steady-state hysteresis loop, while asymmetric fatigue loading cannot, but asymmetric fatigue loading exhibits the displacement increment of fatigue softening. The fracture failure of spot-welded joints is a multiple crack source and the mixed-mode of ductile and brittle fracture mechanism, which exhibits typical fatigue striations in the fatigue fractures.
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Тотай, Анатолий, and Anatoliy Totay. "ANALYTICAL APPROACH TO TECHNOLOGICAL SUPPORT OF FATIGUE LIMIT." Bulletin of Bryansk state technical university 2019, no. 3 (March 27, 2019): 13–20. http://dx.doi.org/10.30987/article_5c8b5cea063335.55319966.

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In the paper on the basis of the theory of metal plastic deformation there are obtained analytical de-pendences of dislocations critical density and cycle number up to destruction caused by factors technological impact upon the surface under working. For the first time in complex there are taken into account such physical characteristics as an effort, temperature and speed of deformation in the area of cutting and strengthening. A tie between such parameters of surface layer state as a steel grain size and dislocations density is defined.
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Szerszen, Maria M., and Andrzej S. Nowak. "Fatigue Evaluation of Steel and Concrete Bridges." Transportation Research Record: Journal of the Transportation Research Board 1696, no. 1 (January 2000): 73–80. http://dx.doi.org/10.3141/1696-10.

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The fatigue limit state is one of the important considerations in the design of bridges. Accumulated load cycles can cause cracking or even failure. An approach to evaluation of steel and concrete bridges with regard to fatigue is presented. The method for prediction of the remaining life of a bridge superstructure is based on the load model and the procedure to estimate fatigue degradation of materials. In the case of steel girders, degradation of material is considered using S-N curves. For reinforced concrete beams, degradation of concrete in the compressive zone is described by the rheological fatigue model. Reliability analysis is performed for the fatigue limit state function of flexure. Prediction of the remaining fatigue life for steel and concrete beams is illustrated on examples of existing bridge girders.
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Moran, B., Y. Xu, and J. D. Achenbach. "Limit-State Surface Element Method: Application to Fatigue Reliability with NDE Inspections." Journal of Engineering Mechanics 126, no. 7 (July 2000): 684–92. http://dx.doi.org/10.1061/(asce)0733-9399(2000)126:7(684).

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Hou, Shanqin, and Jinquan Xu. "A phenomenological life evaluation method for corrosion fatigue." Corrosion Reviews 35, no. 2 (July 26, 2017): 75–83. http://dx.doi.org/10.1515/corrrev-2016-0063.

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AbstractConsidering interacted damage accumulations induced by corrosion, cyclic fatigue, and stress corrosion cracking, a phenomenological corrosion fatigue (CF) life evaluation formula has been proposed. A concept of nominal CF limit has been introduced, which indicates whether cyclic damage accumulation is active or not. It is found that cyclic fatigue damage accumulation enhanced by corrosion is the dominative damage under relatively high stress amplitudes (compared to the nominal limit), whereas, under low stress amplitudes, corrosion damage accumulation would become the dominative one. Stress amplitudes below the nominal fatigue limit would lead to CF too due to corrosion damage accumulation, which can finally make the effective amplitude larger than nominal limit. Once the parameters included in formula have been determined by uniaxial tests, CF life under any complicated stress state could be estimated in a unified way.
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Zhong, Liqiong, Hao Hu, Yilong Liang, and Chaowen Huang. "High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature." Metals 9, no. 1 (December 21, 2018): 13. http://dx.doi.org/10.3390/met9010013.

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In this paper, the high cycle fatigue performance of solid solution state and aged Inconel 718 superalloys was studied at room temperature. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the original structural features and fatigue deformation features of two kinds of alloys. SEM, laser scanning confocal microscopy, and electron backscatter diffraction (EBSD) were used to analyze the secondary fracture features of the fatigue fracture morphology and fatigue fracture profile. The results showed that the aging treatment significantly affected the strength and plasticity of the alloy, which in turn affected the fatigue performance of the alloy. After the aging treatment, the yield strength σs and the tensile strength σb of the Inconel 718 alloy increased by 152% and 65.9%, respectively, compared with those of the solid solution state, but the rate of elongation δ and rate of contraction in the cross-section area φ decreased by 63.7% and 52.3%, respectively. The fatigue limit of the aged state was lower than that of the solid solution state by 6.3%. The quadratic function relationship between the high cycle fatigue limit σ−1 and the tensile strength σb of the Inconel 718 superalloy at room temperature was σ−1 = σb · (0.869−3.67 × 10−4 · σb). An analysis of the fatigue fracture mechanism showed that the fatigue fractures before and after aging were all initiated in the grains oriented relatively unfavorably on the surface of the sample, with a mixture of intergranular and transgranular propagation after the transgranular propagation of several grains. The higher plasticity of the solid solution state Inconel 718 alloy resulted in a large number of slip deformation zones under high cycle fatigue loads, and the plastic deformation was relatively uniform. The lengths of the secondary fractures were as high as 120 μm, which formed the single-source plastic fatigue fracture that promoted an increase in the fatigue limit. After aging treatment, the higher strength of the Inconel 718 alloy made dislocation slip difficult under high cycle fatigue loads, and the plasticity compatible deformation capability was poor. When local dislocations slipped to the intragranular γ” phase, γ’ phase, or interfaces with nonmetallic compounds (NMCs), plugging occurred. The degree of stress concentration increased, causing the initiation of fatigue fracture; the secondary fracture was approximately 20 μm. Brittle cleavage due to multiple sources significantly reduced the fatigue limit.
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Collette, Matthew, and Atilla Incecik. "An Approach for Reliability-Based Fatigue Design of Welded Joints on Aluminum High-Speed Vessels." Journal of Ship Research 50, no. 01 (March 1, 2006): 85–98. http://dx.doi.org/10.5957/jsr.2006.50.1.85.

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Fatigue cracks are an ongoing problem for aluminum high-speed vessels, and preventing fatigue cracks caused by wave loading is expected to be a significant challenge for future aluminum high-speed ferries and military vessels. To aid in this effort, a hot-spot fatigue design approach using first-order reliability methods (FORM) is constructed. Two different limit state functions are investigated, and the accuracy and consistency of the FORM method for the highly nonlinear fatigue limit state equations are evaluated through a comparison with Monte Carlo simulation results. The sensitivity of the resulting safety index to changes in the input variables, and their uncertainties, are presented graphically. The method is compared to existing design standards for four simple structural details.
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Scott-Emuakpor, Onome, M. H. Herman Shen, Tommy George, Charles J. Cross, and Jeffrey Calcaterra. "Development of an Improved High Cycle Fatigue Criterion." Journal of Engineering for Gas Turbines and Power 129, no. 1 (March 1, 2004): 162–69. http://dx.doi.org/10.1115/1.2360599.

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An integrated computational-experimental approach for prediction of total fatigue life applied to a uniaxial stress state is developed. The approach consists of the following elements: (1) development of a vibration based fatigue testing procedure to achieve low cost bending fatigue experiments and (2) development of a life prediction and estimation implementation scheme for calculating effective fatigue cycles. A series of fully reversed bending fatigue tests were carried out using a vibration-based testing procedure to investigate the effects of bending stress on fatigue limit. The results indicate that the fatigue limit for 6061-T6 aluminum is approximately 20% higher than the respective limit in fully reversed tension-compression (axial). To validate the experimental observations and further evaluate the possibility of prediction of fatigue life, an improved high cycle fatigue criterion has been developed, which allows one to systematically determine the fatigue life based on the amount of energy loss per fatigue cycle. A comparison between the prediction and the experimental results was conducted and shows that the criterion is capable of providing accurate fatigue life prediction.
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Dissertations / Theses on the topic "Fatigue limit state"

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Majdič, Petr. "Napěťová, deformační a bezpečnostní analýza statoru generátoru zatíženého nehomogenní teplotou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231962.

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This thesis deals with stress, strain and reliability analysis of synchronous generator stator including an inhomogeneous temperature field. Using the finite element method, stress and strain are calculated, and from these values safety against yield strength is determined, which is followed by the life calculation of the most stressed weld joint and the determination of its possible damage during the period required by the customer.
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Čoček, Jan. "Konstrukční řešení mechanismu napínací kladky zkušebního zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231728.

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The aim of this diploma thesis is the design of automatic tensioning device for regulating forces in driving belts of high-pressure pumps under long-term testing, in collaboration with Bosch Diesel s.r.o. in Jihlava. The paper describes the development of the mechatronic device, from the selection of components, going through the design phase of the automatic electronic device, up to mechanical design and prototype execution. An assessment is made of custom device based on the test in real operations and economic benefits for the client are evaluated in the conslusion.
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Oliveira, António Manuel Prada. "Avaliação do risco associado ao dimensionamento de pavimentos flexíveis." Doctoral thesis, 2014. http://hdl.handle.net/1822/29072.

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Tese de doutoramento em Engenharia Civil
Um pavimento rodoviário, para além da sua importante contribuição para a cómoda e segura circulação dos utentes da via, consome grande parte dos recursos financeiros alocados à construção ou beneficiação de uma infraestrutura. A uma estrutura desta natureza, impõem-se um conjunto de características que devem perdurar ao longo do tempo. Este carácter duradouro é garantido em duas fases distintas: em fase de projeto, pelo adequado dimensionamento da estrutura e durante a execução da obra, pela qualidade dos processos e materiais de construção. O dimensionamento de um pavimento requer o conhecimento de um conjunto de fatores que permitam avaliar ações e prever a resistência mecânica das camadas envolvidas. No âmbito da tradicional engenharia de pavimentos, a quantificação destes fatores tem um carácter determinístico, optando-se por valores mais ou menos conservadores em função do julgamento e conhecimento do projetista. Embora a abordagem seja determinística, o reconhecimento da variabilidade dos fatores envolvidos é uma realidade inalterável. A espessura de uma camada varia ao longo da infraestrutura. Influenciado pela temperatura, percentagem de betume, porosidade, etc…, o módulo de rigidez de uma camada betuminosa também varia de local para local. O número de veículos que se espera solicitem o pavimento, sendo um exercício de previsão, é claramente uma variável aleatória. Neste sentido, a quantificação de cada fator envolvido traduz-se na introdução de uma probabilidade de falha, cuja avaliação é impossível de efetuar segundo a abordagem tradicional. Com este trabalho pretende abordar-se a problemática do dimensionamento de um pavimento flexível sob o ponto de vista estocástico. Com base em amostras recolhidas em nove obras, para além de um contributo para a análise probabilística de um conjunto de fatores necessários à caracterização mecânica dos materiais betuminosos, avalia-se a variabilidade do módulo de rigidez e espessura das camadas betuminosas, determinando-se os seus efeitos sobre diferentes estruturas de pavimentos. A abordagem probabilística ao dimensionamento de um pavimento flexível é feita associando a cada estrutura a competente probabilidade de ruína, cuja determinação se faz pelo método de simulação de Monte Carlo e pelos modelos aproximados do segundo momento de primeira ordem (FOSM - First Order Second Moment, na terminologia inglesa) e das estimativas pontuais.
In addition to its important contribution to the safe movement of vehicles, the pavement consumes much of the financial resources allocated to the construction or improvement of a roadway. A structure of this nature requires a set of features that must persist over time. This long-lasting character is ensured in two distinct phases: in the design phase, by the proper design of the structure and, during the construction phase, by the processes and materials quality control. The design of a pavement requires knowledge of a set of factors which are relevant to assessing loads and predict the mechanical resistance of the layers involved. Within the framework of traditional engineering, the quantification of these factors has a deterministic character, resulting in the choice of values more or less conservatives as a function of judgment and knowledge of the pavement designer. Although the approach is deterministic, recognizing the variability of the factors involved is an unalterable reality. The thickness of a layer varies along the infrastructure. Influenced by temperature, binder content, porosity, etc. ..., the stiffness modulus of a bituminous layer also varies from place to place. The number of vehicles that are expected to load the pavement, being a forecasting exercise, is clearly a random variable. In this sense, the quantification of each factor involved is reflected in the introduction of a probability of failure, the assessment of which is impossible to perform according to the traditional approach. This work aims at addressing the problem of designing a flexible pavement under the stochastic point of view. Based on samples data collected in nine roadways, in addition to an input for the probabilistic analysis of a set of factors required for the mechanical characterization of bituminous materials, the variability of the stiffness modulus and thickness of the asphalt layers is evaluated, determining its effects on different pavement structures. The probabilistic approach to the design of a flexible pavement is carried out by assigning each structure the probability of failure, the determination of which is made by the method of Monte Carlo simulation and the approximate models such as the FOSM (First Order Second Moment) and the point estimation method.
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Books on the topic "Fatigue limit state"

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United States. National Aeronautics and Space Administration., ed. Compendium of mechanical limit-states. [Washington, D.C.]: National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Fatigue limit state"

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Milenin, Alexey, Elena Velikoivanenko, Galina Rozynka, and Nina Pivtorak. "Damage Accumulation and Limit State of Welded Pipelines with Corrosion-Erosion Metal Loss Due to Ultra-Low-Cycle Fatigue." In Structural Integrity, 175–80. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47883-4_33.

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Vejvoda, Stanislav. "Multiaxial Loading in the Program States for Assessment of Limit States." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3, 817–22. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_129.

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Lukács, János. "Fatigue Crack Propagation Limit Curves for High Strength Steels and Their Welded Joints Based on Two-Stage Relationship." In Lecture Notes in Mechanical Engineering, 742–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75677-6_63.

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Guedes Soares, C., and Y. Garbatov. "Fatigue Reliability of Ship Hulls with Random Limit State." In Advances in Safety and Reliability, 1467–74. Elsevier, 1997. http://dx.doi.org/10.1016/b978-008042835-2/50164-8.

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Skaloud, M., and M. Zöraerová. "The Fatigue Limit State of Thin-Walled Steel Girders Subjected to Repeated Loading." In Thin-Walled Structures, 515–22. CRC Press, 2018. http://dx.doi.org/10.1201/9781351077309-58.

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Gomes, Gilberto, Thiago Oliveira, and Francisco Evangelista Jr. "A Probabilistic Approach in Fuselage Damage Analysis via Boundary Element Method." In Advances in Fatigue and Fracture Testing and Modelling [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98982.

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This chapter presents a new alternative approach to the analysis of the fatigue life of aircraft fuselage parts considering the compliance of internal elements to replace the classical model of critical crack size. In this case, from a global–local analysis using the boundary element method (BEM), induced stresses at a macro model, and their effects on micro models are evaluated. The BEM enables efficient simulations of the propagation of initial defects to assess the damage tolerance. For this purpose, computational techniques were developed that allowed evaluating these models, through a probabilistic treatment to assess damage tolerance and fatigue life. Finally, this technique is shown as an alternative to ensure the integrity and proper operation of fuselage panels avoiding reaching a Limit State during its projected lifespan.
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Ceroni, Francesca, Tommaso D’Antino, Renata Kotynia, Roland Niedermeier, Eva Oller, Stavroula Pantazopoulou, and Konrad Zilch. "Ultimate limit states for predominantly static loading and fatigue." In fib Bulletin 90. Externally applied FRP reinforcement for concrete structures, edited by Stijn Matthys and Thanasis Triantafillou, 78–115. fib. The International Federation for Structural Concrete, 2019. http://dx.doi.org/10.35789/fib.bull.0090.ch06.

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Mertz, D. "The fatigue limit states of the AASHTO LRFD Bridge Design Specifications." In Bridge Maintenance, Safety, Management and Life-Cycle Optimization, 489. CRC Press, 2010. http://dx.doi.org/10.1201/b10430-377.

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Conference papers on the topic "Fatigue limit state"

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Morahan, Darren J., and Minaz Lalani. "Fatigue and Ultimate Limit State of Grouted Tubular Joints." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28633.

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A joint industry project commenced in 1993 to develop a design manual for tubular joints, which are strengthened or repaired through chord grout filling. This project was carried out in two phases and was completed in the late 1990’s. The project comprised the conduct of over 200 SCF and ultimate load tests on large scale as-welded and grouted tubular joints. In addition to the testing programme, studies on offshore deployment were carried out to ensure that complete chord grout filling was achievable for all practical scenarios. The primary reason for carrying out this project is the industry-wide recognition that chord grout filling represents an extremely cost-effective and mechanically efficient method to strengthen or repair tubular joints. Further, it has been recognised that double-skin joints (e.g. pile through leg with annulus grout-filled) are often present in structures and the enhanced strength and fatigue characteristics as a result could be exploited to permit more efficient new platform designs or better estimation of joint performance for existing installations. Although API RP2A [1] and ISO [2] recommendations permit the use of grouted joints, little guidance is provided. The guidance that is provided is based on public domain data and engineering principles. This project was carried out to generate a substantial amount of new data/information, leading to the creation of a detail design manual for grouted joints [3,4].
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Xu, Jianfeng, Srinivas Vishnubhotla, Olav Aamlid, and Leif Collberg. "Reeling Analysis and Limit State Criteria." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54971.

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Reeling has been an attractive offshore installation method for rigid flowlines and steel catenary risers due to its fast speed, cost effectiveness and reliability. Over years of evolution, it has become a proven technology, and the understanding to the engineering fundamentals is greatly improved as well. Due to the reeling process, the pipeline is plastically deformed; residual stresses, pipe ovality, and pipe out of straightness are increased. The strength, fatigue, and fracture performance of the pipe and the girth weld have to be closely evaluated to insure the pipeline integrity during and after the installation. As part of the installation design, different types of analyses are generally carried out to demonstrate the reelability, and the pipeline responses against all limit states. However, the methods adopted by different contractors can vary greatly. In this paper, the engineering fundamentals of reeling process are reviewed. A few typical reeling analyses, both analytical and finite element based, are demonstrated with examples. The local buckling limit state criteria based on DNV-OS-F101 for different stages of reeling are also illustrated.
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Morahan, D. J., R. J. van Foeken, M. Lalani, and J. Wardenier. "New Data on the Fatigue and Ultimate Limit State of Grouted Tubular Joints." In Offshore Technology Conference. Offshore Technology Conference, 1996. http://dx.doi.org/10.4043/8080-ms.

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Singh, Manander, and Suhail Ahmad. "Probabilistic Analysis and Risk Assessment of Deep Water Composite Production Riser Against Fatigue Limit State." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41576.

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Deep water composite risers are subjected to randomly fluctuating loads, induced by wind and waves in the presence of fluctuating axial tension which may be critical in deep sea conditions. Therefore, risers experience the extreme bending and randomly fluctuating stresses throughout their service life. Cumulative fatigue damage is a critical assessment of riser life in the presence of large dynamic stresses. Probabilistic analysis and risk assessment of composite risers for cumulative fatigue is a vital design requirement for its satisfactory service and survival for stipulated period. Without addressing the reliability assessment, composite risers may not be recommended for deep water oil and gas exploration and production. Hence, the reliability assessment is a critical issue that is to be addressed for the safety of the deep water composite riser. It is studied for the entire system for all possible sea states occurring in the exploration region. Unlike conventional risers, the wall structure of a composite riser is more complicated. Therefore, multiple failure mechanisms are used jointly to assess the safety of the composite riser. Fatigue reliability is a challenging task due to complex nature of dynamic response and associated uncertainties caused by the material and external loads. The present study is focused on reliability assessment using stochastic finite element analysis. Response time histories for random sea plus current have been obtained. Requisite numbers of sea states are considered for the simulation of a wide range of off-shore environment and estimation of accumulated damage. By using the S-N data, damage fractions are calculated then summed linearly using Miner-Palmgren rule. The total damage has been obtained by summing the accumulated damages over all the sea states under consideration. Non-linear limit state function is derived based upon the above given approach to calculate the fatigue life. Important uncertainties associated with random variables are considered while deriving the limit state function. Numerical methods, such as Monte Carlo simulation and Advanced First Order Reliability Method, are used for the calculation of the reliability. The sensitivities of various random variables on overall probability of failure have been studied and design points have been located on failure surface. Probabilities of failure for important parameters are investigated.
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Baxter, David, and Peter Tubby. "SAFEBUCK JIP: Critical Aspects of the Fatigue Limit State for Pipelines Designed to Laterally Buckle." In Offshore Technology Conference. Offshore Technology Conference, 2011. http://dx.doi.org/10.4043/21510-ms.

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Semiga, Vlado, Sanjay Tiku, Aaron Dinovitzer, Joe Zhou, and Millan Sen. "Development of a Pipeline Wrinkle Material Ultimate Limit State: Full Scale Modeling." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64620.

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While the formation of a wrinkle in an onshore pipeline is an undesirable event, in many instances this event does not have immediate pipeline integrity implications. The magnitude or severity of a wrinkle formed due to displacement controlled loading processes (e.g. slope movement, fault displacement, frost heave and thaw settlement) may increase with time, eventually causing serviceability concerns (e.g. fluid flow or inspection restrictions). Pipe wall cracking and eventually a loss of containment involves contributions from the wrinkle formation process, as well as wrinkle deformations caused by in-service line pressure, temperature and seasonal soil displacements. The objective of this paper is to provide an overview of the ongoing research efforts, sponsored by TransCanada PipeLines Ltd, towards the development of a mechanics based wrinkle ultimate limit state that may be used in future to evaluate the long term integrity of wrinkled pipeline segments. The research efforts include testing and non-linear finite element modeling of a full scale wrinkled pipeline segment. This paper outlines the development of the full scale finite element model, including the detailed material model development, used to estimate the fatigue life of the experimental full scale fatigue test specimen. A comparison is then carried out between the experimental results and the results from the finite element analysis.
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Martins, Michele A. L., Andre´ S. Do´ria, and Eduardo S. S. Silveira. "Long-Term Fatigue and Extreme Design of Steel Risers." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79272.

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Environmental loads are the main source of dynamic excitation of offshore structures. Due to the random nature of these loads, one should consider statistical properties when designing such structures. Recent codes for the design of steel risers address the use of environmental contours or full long-term analysis to take into account the statistics of load effects. Moreover, sea states for fatigue design should also be carefully selected so as to include the region of the scatter diagram which most contributes to the total damage. This paper looks into fatigue and ultimate limit states of steel risers. The first part shows a comparative study of three design criteria for extreme statistical analysis. These criteria are based on design storm, environmental contour, and full long-term statistics. A joint probability distribution found in the literature for a Brazilian location was used to describe the correlation between the significant wave height and the zero crossing wave period. The second part deals with the analysis of the coefficient of contribution for fatigue and long-term extreme statistics. Several full time domain analyses were performed and the most important sea state region for each limit state is shown in two examples of steel catenary risers. A discussion about sea state selection is then presented.
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Jameel, Mohammed, and Suhail Ahmad. "Fatigue Reliability Assessment of Coupled Spar-Mooring System." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49687.

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Spar platform is a compliant floating structure used for exploration of oil and gas from deep sea. To ensure safe operations, reliability against mooring line failure is a major concern in design. Furthermore, the mooring lines have high investment costs and are normally not accessible for in-service inspection. The common approach for solving the dynamics of Spar system is to employ a decoupled quasi-static approach which ignores the platform and mooring lines interaction. Coupled analysis, used presently, considers the mooring lines and platform in an integrated single model. Hence, it effectively captures the damping effect due to Spar and mooring lines coupling. Finite element code ABAQUS is used to obtain the response of Spar-mooring system under long crested random sea with current. Limit state function is derived based on failure due to fatigue for probabilistic reliability assessment. Random variables, participating actively in the limit state function are identified and statistically modeled. The most probable points or the design points are found to be an effective parameter for estimating partial factors of safety for load and resistance variables. First Order Reliability Method (FORM) is used to calculate probability of failure and reliability indices. The results are later checked against Monte carlo simulation. Reliabilities of segmental length of mooring and of full length are determined as they may significantly differ if the mooring properties change along the length. Reliability indices of annual and life time sea states are calculated.
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9

Matheson, Ian, Wenxing Zhou, Joe Zhou, and Rick Gailing. "An Upheaval Buckling Limit State Function for Onshore Natural Gas Pipelines." In 2008 7th International Pipeline Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ipc2008-64687.

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The reliability-based design and assessment (RBDA) methodology has gained increasing acceptance in the pipeline industry, largely due to a multi-year PRCI program aimed at establishing RBDA as a viable alternative for the design and assessment of onshore natural gas pipelines. A key limit state of buried pipelines that operate at elevated temperatures is upheaval buckling. The elevated temperatures generate large compressive axial forces that can cause Euler buckling susceptibility. The tendency to buckle is increased at vertical imperfections (i.e. a series of cold formed bends) that primarily occur due to topography. Upheaval buckling in itself is not an ultimate limit state but can lead to high strains, local buckling, high cycle fatigue, expensive remediation measures, and even loss of pressure integrity. The critical forces at which upheaval buckling occurs for typical hill-crest type imperfections present in onshore pipelines cannot be readily predicted using analytical methods. A parametric study is therefore undertaken using non-linear finite element analyses to generate a matrix of upheaval buckling responses. The critical force for the onset of upheaval buckling is then developed using a series of empirical relationships to capture the influences of all key parameters. An upheaval buckling limit state function is subsequently developed by comparing the critical buckling force with applied compressive force, which is a function of operating pressure and temperature differential between the operating and tie-in conditions. The limit state function can be readily implemented in a reliability analysis framework to calculate the pipeline failure probability due to upheaval buckling.
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10

Scott-Emuakpor, Onome, M. H. Herman Shen, Charles Cross, Jeffrey Calcaterra, and Tommy George. "Development of an Improved High Cycle Fatigue Criterion." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53851.

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An integrated computational-experimental approach for prediction of total fatigue life applied to uniaxial stress state is developed. The approach consists of the following elements: (1) development of a vibration based fatigue testing procedure to achieve low cost bending fatigue experiments and (2) development of a life prediction and estimation implementation scheme for calculating effective fatigue cycles. A series of fully reversed bending fatigue tests were carried out using a vibration-based testing procedure to investigate the effects of bending stress on fatigue limit. The results indicate that the fatigue limit for 6061-T6 aluminum is approximately 20% higher than the respective limit in fully reversed tension-compression (axial). To validate the experimental observations and further evaluate the possibility of prediction of fatigue life, an improved high cycle fatigue criterion has been developed, which allows one to systematically determine the fatigue life based on the amount of energy loss per fatigue cycle. A comparison between the prediction and the experimental results was conducted and shows that the criterion is capable of providing accurate fatigue life prediction.
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Reports on the topic "Fatigue limit state"

1

Christine, Lozano, and Riveros Guillermo. Classical and innovative methods of fatigue and fracture repairs in navigation steel structures. Engineer Research and Development Center (U.S.), April 2021. http://dx.doi.org/10.21079/11681/40422.

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Most of the hydraulic steel structures (HSS) in the U.S. have reached or have past their design life, which leads to unsatisfactory performance. Welded connections with low fatigue resistance, poor weld quality, unanticipated structural behavior, or unexpected loading due to the deterioration of the design boundary conditions are the causes of fatigue cracking. The purpose of this report is to identify and evaluate the traditional and new methods used for fatigue and fracture repairs in navigation steel structures to restore their load carrying capacity and fatigue and fracture resistance. The final objective was to generate a guidance report comprising of recommended and more efficient repair methods for the different fatigue limit states observed in navigation steel structures.
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