Relevant bibliographies by topics / Variable amplitude loading (VAL)

Academic literature on the topic 'Variable amplitude loading (VAL)'

Author: Grafiati
Published: 10 December 2022
Last updated: 19 February 2023

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Journal articles on the topic "Variable amplitude loading (VAL)"

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Liu, Zhi Fang, Li Xiong Gu, and Zhong Yong Xu. "Fatigue Crack Propagation Prediction under Single Overload Variable Loading." Applied Mechanics and Materials 275-277 (January 2013): 215–19. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.215.

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Reasonably predicting the fatigue life of specimens, depends on the research and understanding of the fatigue crack propagation behavior under variable amplitude loading (VAL) rather than under constant amplitude loading (CAL). The present study aims at evaluating residual fatigue life under single overload VAL by adopting a dynamical coefficient mechanics (DCM) model which we have reported. New formulas connecting the crack length with number of cycles and expressions for the fatigue crack propagation (FCP) under single overload VAL have been derived and were used to predict crack propagation. The ratios of predicted-to-experimental lives range from 1.00 to 1.09, which indicates that the results obtained from this DCM model are in good agreement with experimental data from published literatures and cover all stages of fatigue crack growth curve.
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Gu, Li Xiong, Zhi Fang Liu, and Zhong Yong Xu. "A Dynamical Coefficient Mechanics Model for Fatigue Crack Growth under Variable Amplitude Loading." Applied Mechanics and Materials 401-403 (September 2013): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.3.

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Almost all load bearing components usually experience variable amplitude loading (VAL) rather than constant amplitude loading (CAL) during their service lives. The present study aims at evaluating residual fatigue life under VAL by adopting a dynamical coefficient mechanics (DCM) model which we have reported. New formulas connecting the crack length with number of cycles and expressions for the FCG rate under VAL have been derived and were used to predict crack propagation. The ratios of predicted-to-experimental lives range from 1.00 to 1.04, which indicates that the results obtained from this DCM model are in good agreement with experimental data from published literatures and cover all stages of fatigue crack growth curve.
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Liu, Zhi Fang, Li Xiong Gu, and Zhong Yong Xu. "Data Fitting Analysis for Fatigue Crack Growth under Multiple Overload Variable Amplitude Loading." Advanced Materials Research 663 (February 2013): 645–49. http://dx.doi.org/10.4028/www.scientific.net/amr.663.645.

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The present study aims at evaluating residual fatigue life under multiple overload variable amplitude loading (VAL) by using a dynamical coefficient mechanics (DCM) model which we have reported for data fitting analysis. New formulas connecting the crack length with number of cycles and expressions for fatigue crack growth (FCG) under multiple overload VAL have been derived and were used to predict crack propagation. The ratios of predicted-to-experimental lives range from 1.01 to 1.03, which indicates that the results obtained from this DCM model are in good agreement with experimental data from published literatures and cover all stages of fatigue crack growth curve.
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Zakaria, K. A., S. Abdullah, Mariyam Jameelah Ghazali, and C. H. Azhari. "Elevated Temperature Fatigue Fracture Behaviour of Aluminium Alloy Subjected to Spectrum Loadings." Applied Mechanics and Materials 165 (April 2012): 219–23. http://dx.doi.org/10.4028/www.scientific.net/amm.165.219.

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This paper discusses the fatigue fracture behaviour of aluminium alloy AA6061-T6 under spectrum loadings at room and elevated temperatures. The load sequence can have a very significant effect in fatigue lives and normally the fatigue strength of material decrease with increasing temperature. In this study, variable amplitude loading (VAL) signal was obtained from the engine mount bracket of an automobile in a normal driving condition. Constant amplitude loading (CAL), high to low and low to high spectrum loadings were then derived from the VAL obtained from the data capturing process to study the fatigue behaviour that subjected to spectrum loadings at the room and elevated temperatures. The fatigue tests were performed according to an ASTM E466 standard using a servo-hydraulic fatigue testing machine. Fatigue fracture surfaces were then sectioned and inspected by employing a high magnification microscope. Results indicated that fracture surface behaviours of specimens were influenced significantly by the load sequence and temperatures, which can be related to the fatigue lives of aluminium alloy under spectrum loadings.
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Schiller, R., D. Löschner, P. Diekhoff, I. Engelhardt, Th Nitschke-Pagel, and K. Dilger. "Sequence effect of p(1/3) spectrum loading on service fatigue strength of as-welded and high-frequency mechanical impact (HFMI)-treated transverse stiffeners of mild steel." Welding in the World 65, no. 9 (May 18, 2021): 1821–39. http://dx.doi.org/10.1007/s40194-021-01121-3.

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AbstractIn the meantime, it’s well known that post-weld fatigue strength improvement techniques for welded structures like high-frequency mechanical impact (HFMI) treatment increase the fatigue live of welded joints. Although the current design recommendations for HFMI-treated welded joints give first design proposals for the HFMI-treated welds, in practice the application of HFMI treatment and the associated increase in fatigue resistance are still being discussed. There are, for example, reservations regarding the efficiency of HFMI-treated welded joints under variable amplitude loading (VAL). This paper analyses first results for the sequence effect of VAL of a p (1/3) spectrum on the service fatigue strength of HFMI-treated transverse stiffeners (TS) of mild steel (S355). Fatigue test results with random and high-low loading for the two states as-welded (AW) and HFMI-treated joints will be presented. The modified linear damage accumulation and the failure locations will be discussed. The experimental results show a clear change in the slope of the S-N curve from the as-welded (AW) state to the HFMI state and additionally in the HFMI state from constant amplitude loading (CAL) to variable amplitude loading (VAL). It was particularly noticeable in the experimental results of all tested HFMI series that the specimens failed exclusively in the base material 2–4mm before the HFMI-treated welds. The presented results of the investigations show that with application of the nominal stress concept, no sequence effect was recognizable.
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Nik Abdullah, N., M. Hadi Hafezi, and Shahrum Abdullah. "Analytical Concepts for Recent Development in Fatigue Crack Growth under Variable Amplitude Loading. Part I: Qualitative Interpretation." Key Engineering Materials 462-463 (January 2011): 59–64. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.59.

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Understanding effective parameters in fatigue crack growth (FCG) model under variable amplitude loading (VAL) is of eminent importance theoretically as well as experimentally. In response to this necessity, a systematic study of different analytical concepts and loading sequences in order to gain a practical framework has been proposed. The theoretical background related to the fatigue life prediction by using FCG model has been presented. This has shown the rationale of why we need to calculate local stress-strain in the crack tip in developing FCG models which is the main subject of this research.
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Braun, Moritz, Alfons Dörner, Kane F. ter Veer, Tom Willems, Marc Seidel, Hayo Hendrikse, Knut V. Høyland, Claas Fischer, and Sören Ehlers. "Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading." Energies 15, no. 2 (January 13, 2022): 559. http://dx.doi.org/10.3390/en15020559.

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Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider the effects of ice loading and its stochastic nature on the fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented by loading the structure using a variable-amplitude loading (VAL) sequence. Typical offshore load spectra are developed for wave and wind loading. Thus, a combined VAL spectrum is developed for wind, wave, and ice action. To this goal, numerical models are used to simulate the dynamic ice-, wind-, and wave-structure interaction. The stress time-history at an exemplarily selected critical point in an offshore wind energy monopile support structure is extracted from the model and translated into a VAL sequence, which can then be used as a loading sequence for the fatigue assessment or fatigue testing of welded joints of offshore wind turbine support structures. This study presents the approach to determine combined load spectra and standardized time series for wind, wave, and ice action.
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Murthy, A. Rama Chandra, G. S. Palani, and Nagesh R. Iyer. "Damage Tolerance Evaluation of Cracked Tubular Joints Subjected to Fatigue Loading." Key Engineering Materials 452-453 (November 2010): 653–56. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.653.

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This paper presents methodologies for damage tolerance evaluation of tubular T- and Y-joints by using linear elastic fracture mechanics (LEFM) principles. The damage tolerance evaluation is in terms of crack growth analysis and remaining life prediction of tubular joints. Stress intensity factor (SIF) for T-butt plates which can be used for computation of SIF for tubular joints has been evaluated as per BS: 7910. It is observed from the literature that the expressions given in BS: 7910 for computation of SIF have not been used for remaining life prediction of tubular joints. In this paper, these expressions have been used for analytical prediction of remaining life of tubular T- and Y- joints subjected to constant amplitude loading (CAL) and variable amplitude loading (VAL). Wheeler residual stress model has been employed to represent the retardation effects due to tensile overloads. It is observed that remaining life predicted for T- and Y-joints under CAL are found to be in good agreement with those of experimental values reported in the literature. In the case of VAL, it is observed that crack growth retardation increases with increase of OLR resulting in higher predicted remaining life. It has also been observed that the predicted remaining life is influenced by the number of OLs and occurrence of OL. Early occurrence of OL causes the higher remaining life compared to later OLs.
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Abdelkader, Miloudi, Zemri Mokhtar, Benguediab Mohamed, Mazari Mohamed, and Amrouche Abdelwaheb. "Crack propagation under variable amplitude loading." Materials Research 16, no. 5 (July 5, 2013): 1161–68. http://dx.doi.org/10.1590/s1516-14392013005000110.

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SONSINO, C. "Fatigue testing under variable amplitude loading." International Journal of Fatigue 29, no. 6 (June 2007): 1080–89. http://dx.doi.org/10.1016/j.ijfatigue.2006.10.011.

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Dissertations / Theses on the topic "Variable amplitude loading (VAL)"

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Hooper, J. "Fretting fatigue under variable amplitude loading." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/11046.

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Fretting fatigue is a major concern in the design of engineering components that will be subjected to clamping pressures whilst operating in a vibrational environment. The type of loading environment generated in these applications is generally of a variable amplitude nature. Therefore it is important for engineers to understand how such loading affects the severity of fretting fatigue. In the absence of this understanding, engineering designers are left to apply simplistic plain fatigue life prediction rules, such as Miners linear damage law, to try to estimate the damage generated from a particular loading history. In order to try to establish a baseline for the understanding of fretting fatigue under variable amplitude loading, a structured series of CAL and V AL tests were designed and carried out. The aim of the CAL tests was to characterise the fretting fatigue test rig (designed by the author) so that an experimental foundation could be developed, upon which the fretting fatigue study was based. A structured investigation into the effects on fretting fatigue of applying various specifically designed loading histories was carried out and some very distinct relationships between the applied loading spectra and fretting fatigue life were found. For the application of overloads it was observed that overload size, overload application interval and the number of overloads in each application all had a sizeable effect on the severity of fretting. Two-level, three-level and five-level block loading tests were also investigated and numerous loading history dependent results were obtained. The applicability of Miners law to fretting fatigue was assessed. Combining Miners law with well-defined CAL stress-life results gave reasonable predictions for all of the V AL fretting fatigue tests carried out, with damage summations at failure ranging from 0.64 (non-conservative) to 3.19 (conservative). However, a more detailed investigation into the relationship between fretting fatigue lives and damage summations due to the individual loading levels highlighted that the assumption of linear damage may not be applicable to fretting fatigue, especially during crack initiation and early crack growth. A hypothesis was proposed to explain the fretting fatigue life and Miner damage results observed for the different loading spectra, and reasonable success was obtained for tests where the Miners law proved conservative (in 27 of 36 tests), although the hypothesis was not able to explain the non-conservative results obtained in the other nine tests.
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Hooper, Jeremy. "Fretting fatigue under variable amplitude loading." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/11046.

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Fretting fatigue is a major concern in the design of engineering components that will be subjected to clamping pressures whilst operating in a vibrational environment. The type of loading environment generated in these applications is generally of a variable amplitude nature. Therefore it is important for engineers to understand how such loading affects the severity of fretting fatigue. In the absence of this understanding, engineering designers are left to apply simplistic plain fatigue life prediction rules, such as Miners linear damage law, to try to estimate the damage generated from a particular loading history. In order to try to establish a baseline for the understanding of fretting fatigue under variable amplitude loading, a structured series of CAL and V AL tests were designed and carried out. The aim of the CAL tests was to characterise the fretting fatigue test rig (designed by the author) so that an experimental foundation could be developed, upon which the fretting fatigue study was based. A structured investigation into the effects on fretting fatigue of applying various specifically designed loading histories was carried out and some very distinct relationships between the applied loading spectra and fretting fatigue life were found. For the application of overloads it was observed that overload size, overload application interval and the number of overloads in each application all had a sizeable effect on the severity of fretting. Two-level, three-level and five-level block loading tests were also investigated and numerous loading history dependent results were obtained. The applicability of Miners law to fretting fatigue was assessed. Combining Miners law with well-defined CAL stress-life results gave reasonable predictions for all of the V AL fretting fatigue tests carried out, with damage summations at failure ranging from 0.64 (non-conservative) to 3.19 (conservative). However, a more detailed investigation into the relationship between fretting fatigue lives and damage summations due to the individual loading levels highlighted that the assumption of linear damage may not be applicable to fretting fatigue, especially during crack initiation and early crack growth. A hypothesis was proposed to explain the fretting fatigue life and Miner damage results observed for the different loading spectra, and reasonable success was obtained for tests where the Miners law proved conservative (in 27 of 36 tests), although the hypothesis was not able to explain the non-conservative results obtained in the other nine tests.
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BAKHTIARI, SAEEDEH. "Fatigue behaviour of welded components under variable amplitude loading." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141773.

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The current thesis work is based on fatigue testing of welded structures which is completed in collaboration with Volvo CE. Improvement of the technology and customers demands for higher quality products with lower price makes the VCE to invest on the product development projects. One of the projects in VCE focuses on the weight and production cost optimization of the bogie beam on the hauler. The present project is a completion of the previous project with the objective of the fatigue testing of the bogie beam of the hauler under oscillating loads for verification of the expected fatigue life assessed with FEM. In the process of this work, an existing test rig is modified. The strains over the beam are measured through strain gauges mounted on the beam. The simulated model, the stresses and strains are investigated. The fatigue life is evaluated with different fatigue assessment methods. Finally, the outcomes of all the methods for fatigue investigation of the beam are compared and verified.
Detta examensarbete, som utförts för Volvo CE, behandlar utmattningsprov av svetsade konstruktioner. Teknikutveckling och förändrade kundkrav på högre kvalitet till en lägre kostnad är drivkrafter för Volvo CE att investera i produkt- och metodutvecklingsprojekt, som exempelvis det aktuella projektet att optimera vikt och tillverkningskostnad för boggi-balkar till dumprar. Detta projekt är en fortsättning av ett tidigare arbete som hade som mål att verifiera utmattningslivslängden för en boggibalk till en dumper predikterad med FEM, genom att utmattningsprova balken för oscillerande last. Som en del av projektet modifieras en existerande provningsrigg. Töjningar på balken mats med ett antal töjningsgivare monterade på balken. Spännings och töjningfrån den simulerade modellen analyseras och utmattningslivslängden jämförs för olika metoder för att prediktera utmattning. Slutligen jämförs och veriferas dessa metoder.
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Xiang, Zhang. "Numerical simulation of fatigue crack propagation under variable amplitude loading." Thesis, Imperial College London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308604.

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Aguilar-Espinosa, Aaron Alejandro. "Effect of variable amplitude loading on fatigue crack growth rate." Thesis, Oxford Brookes University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496022.

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Fatigue crack growth (FCG) is a major cause of failure in many engineering components and structures that are subjected to dynamic loading conditions. Several models have been proposed for estimating crack growth rate da/dN under various conditions. The majority of work reported has focused on constant amplitude (CA) loading and some for variable amplitude (VA) loading. The estimation of da/dN under VA loading is complex due to effects of several factors such as plasticity, crack tip blunting, residual stresses, crack tip closure and crack tip branching which are associated with different levels of loading. These factors which cause acceleration or deceleration of the crack growth are known as interaction effects. Crack closure has been identified to be one of the main interaction factors, and finite element (FE) models have been developed to quantify it in terms of crack opening stresses. There are however still a number of issues regarding the modelling parameters such as mesh size, element type, number of loading increments and material hardening models that should be used and on whether crack closure represents the interaction effects sufficiently. Also modelling long crack lengths has been perceived to be too computationally intensive and therefore studies focus on short crack lengths only.
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Rodopoulos, C. A. "Fatigue studies under constant and variable amplitude loading in MMCs." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245575.

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Razmjoo, Gholam Reza. "A fracture mechanics approach to fatigue crack propagation under variable amplitude loading." Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259194.

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Massingham, M. "Fretting fatigue under variable amplitude loading and the role of contact geometry." Thesis, Cranfield University, 2005. http://dspace.lib.cranfield.ac.uk/handle/1826/11430.

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Problem Little research has taken place to investigate fretting fatigue under conditions of variable amplitude loading (VAL) and no research using a complex loading spectra representative of reality. The effect of cycles below the endurance limit has yet to be established for fretting fatigue within such a spectrum. These cycles are of particular concern owing to the large number of these cycles present in comparison to other cycles within the spectrum. Any effects of VAL on local conditions within the contact had also yet to be established. Solution This project attacked the problem of fretting fatigue under conditions of VAL on two fronts. Firstly a vigorous VAL testing program (reconstructed from in-service data) was employed to investigate the effect of VAL on life and damage in general. The relative importance of cycles within the spectrum, particularly those below the endurance limit, with regards to life was investigated. Secondly to establish the effect of VAL within the contact region finite element modelling (FEM) was performed. Single and three level loading histories were applied to the model in order to establish the effect of VAL locally within the contact and offer explanations to the experimental observations. A series of damage prediction parameters including Ruiz and strain life initiation parameters were assessed for their ability to predict such behaviour. A methodology for predicting fretting fatigue life and damage has also been developed during this project. Two contact geometries were tested: a cylindrical Hertzian contact and the rounded punch contact. Conclusions Cycles of amplitude below the constant amplitude fretting fatigue endurance limit are nondamaging within a VAL spectrum. This was primarily attributed to the cycles below the endurance limit having a unique location of damage that other cycles do not influence. More sites of crack initiation were observed in samples that had experienced VAL than those tested under conditions of constant amplitude loading (CAL). The multiple sites of initiation were attributed to the point of maximum damage changing location during VAL. The size of the slip region of a cycle was found to decrease post overload as was the magnitude of Ruiz predicted damage. Strain life parameters also predicted a beneficial effect of an overload on the predicted lives of following CAL cycles. Miner predictions of life were conservative due to the assumptions made by the parameter. Miner sums damage over the entire contact region, essentially attributing that damage to a single location. Miner therefore does not take into account the changing location of maximum damage and the effects of load order and interaction. An alternative methodology for predicting fretting fatigue life during VAL has been presented that has been shown to be more accurate than traditional Miner and can account for unique features within the VAL spectrum e.g. training flights. Both Miner and the VAL methodology have shown that it is the small amplitude cycles within a spectrum that are the most damaging.
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Massingham, Matthew. "Fretting fatigue under variable amplitude loading and the role of contact geometry." Thesis, Cranfield University, 2005. http://dspace.lib.cranfield.ac.uk/handle/1826/11430.

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Problem Little research has taken place to investigate fretting fatigue under conditions of variable amplitude loading (VAL) and no research using a complex loading spectra representative of reality. The effect of cycles below the endurance limit has yet to be established for fretting fatigue within such a spectrum. These cycles are of particular concern owing to the large number of these cycles present in comparison to other cycles within the spectrum. Any effects of VAL on local conditions within the contact had also yet to be established. Solution This project attacked the problem of fretting fatigue under conditions of VAL on two fronts. Firstly a vigorous VAL testing program (reconstructed from in-service data) was employed to investigate the effect of VAL on life and damage in general. The relative importance of cycles within the spectrum, particularly those below the endurance limit, with regards to life was investigated. Secondly to establish the effect of VAL within the contact region finite element modelling (FEM) was performed. Single and three level loading histories were applied to the model in order to establish the effect of VAL locally within the contact and offer explanations to the experimental observations. A series of damage prediction parameters including Ruiz and strain life initiation parameters were assessed for their ability to predict such behaviour. A methodology for predicting fretting fatigue life and damage has also been developed during this project. Two contact geometries were tested: a cylindrical Hertzian contact and the rounded punch contact. Conclusions Cycles of amplitude below the constant amplitude fretting fatigue endurance limit are nondamaging within a VAL spectrum. This was primarily attributed to the cycles below the endurance limit having a unique location of damage that other cycles do not influence. More sites of crack initiation were observed in samples that had experienced VAL than those tested under conditions of constant amplitude loading (CAL). The multiple sites of initiation were attributed to the point of maximum damage changing location during VAL. The size of the slip region of a cycle was found to decrease post overload as was the magnitude of Ruiz predicted damage. Strain life parameters also predicted a beneficial effect of an overload on the predicted lives of following CAL cycles. Miner predictions of life were conservative due to the assumptions made by the parameter. Miner sums damage over the entire contact region, essentially attributing that damage to a single location. Miner therefore does not take into account the changing location of maximum damage and the effects of load order and interaction. An alternative methodology for predicting fretting fatigue life during VAL has been presented that has been shown to be more accurate than traditional Miner and can account for unique features within the VAL spectrum e.g. training flights. Both Miner and the VAL methodology have shown that it is the small amplitude cycles within a spectrum that are the most damaging.
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Shamsaei, Nima. "Multiaxial Fatigue and Deformation Including Non-proportional Hardening and Variable Amplitude Loading Effects." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279760342.

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Books on the topic "Variable amplitude loading (VAL)"

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J, Petit, and Société française de métallurgie, eds. Fatigue crack growth under variable amplitude loading. London: Sole distributor in the USA and Canada, Elsevier Science Pub. Co., 1988.

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McKeighan, PC, and N. Ranganathan, eds. Fatigue Testing and Analysis Under Variable Amplitude Loading Conditions. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2005. http://dx.doi.org/10.1520/stp1439-eb.

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C, McKeighan P., and Ranganathan Narayanaswami, eds. Fatigue testing and analysis under variable amplitude loading conditions. West Conshohocken, PA: ASTM International, 2005.

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Crawford, D. G. Fatigue crack growth in medium scale tubular T-joints under variable amplitude loading. EastKilbride: National Engineering Laboratory, 1990.

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1931-, Fisher John W., American Association of State Highway and Transportation Officials., and United States. Federal Highway Administration., eds. Resistance of welded details under variable amplitude long-life fatigue loading. Washington, D.C: Transportation Research Board, National Research Council, 1993.

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Austen, I. M. Quantitative Assessment of Corrosion Fatigue Crack Growth Under Variable Amplitude Loading. European Communities / Union (EUR-OP/OOPEC/OPOCE), 1988.

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J, Bonacuse P., and Lewis Research Center, eds. Simulation of crack propagation in engine rotating components under variable amplitude loading. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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National Aeronautics and Space Administration (NASA) Staff. Fatigue Analyses under Constant- and Variable-Amplitude Loading Using Small-Crack Theory. Independently Published, 2018.

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P, Phillips E., Everett R. A, and Langley Research Center, eds. Fatigue analyses under constant- and variable-amplitude loading using small-crack theory. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1999.

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Prediction of fatigue-crack growth in a high-strength aluminum alloy under variable-amplitude loading. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1989.

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Book chapters on the topic "Variable amplitude loading (VAL)"

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Choules, Brian D., Alexandra L. Lewis, Brandon G. Gulker, Justin M. Metcalf, and Jace D. Kelley. "Effect of Variable Amplitude Loading in Nitinol Fatigue." In Fourth Symposium on Fatigue and Fracture of Metallic Medical Materials and Devices, 54–68. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2019. http://dx.doi.org/10.1520/stp161620180035.

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Kang, H., K. Kari, A. K. Khosrovaneh, R. Nayaki, X. Su, L. Zhang, and Y. L. Lee. "Fatigue Behavior of AM60B Subjected to Variable Amplitude Loading." In Fatigue of Materials II, 169–78. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48105-0_12.

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Khan, S. U., R. C. Alderliesten, and R. Benedictus. "Crack Growthin Fibre Metal Laminates Under Variable Amplitude Loading." In ICAF 2009, Bridging the Gap between Theory and Operational Practice, 839–58. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2746-7_45.

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Kang, H., K. Kari, A. K. Khosrovaneh, R. Nayaki, X. Su, L. Zhang, and Y. L. Lee. "Fatigue Behavior of AM60B Subjected to Variable Amplitude Loading." In Fatigue of Materials II, 169–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118533383.ch12.

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Middeldorf, K., H. Nowack, A. Fischer, and H. Harig. "Cumulative Damage Under Constant Amplitude and Variable Amplitude Loading: Some New Physical Aspects." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials, 49–54. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3459-7_7.

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Dürr, A., and J. Roth. "Lifetime estimation for hollow-section joints under variable amplitude loading." In Modern Trends in Research on Steel, Aluminium and Composite Structures, 493–99. London: Routledge, 2021. http://dx.doi.org/10.1201/9781003132134-64.

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Amarir, Imane, Hamid Mounir, Abdellatif El Marjani, and Zakaria Haji. "Numerical Simulation of Damped Welded Profiles Under Variable Amplitude Loading." In Algorithms for Intelligent Systems, 659–67. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3246-4_51.

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Walther, F., and Dietmar Eifler. "Fatigue Behaviour of Railway Wheel Steels under Constant and Variable Amplitude Loading." In Materials Science Forum, 473–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-426-x.473.

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Brake, Nicholas A., and Karim Chatti. "Plain Concrete Cyclic Crack Resistance Curves under Constant and Variable Amplitude Loading." In 7th RILEM International Conference on Cracking in Pavements, 571–80. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-4566-7_55.

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Remadi, Amina, Ahmed Bahloul, and Chokri Bouraoui. "Residual Plastic Zone in Front of Crack Tip Under Variable Amplitude Loading." In Lecture Notes in Mechanical Engineering, 243–50. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14615-2_28.

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Conference papers on the topic "Variable amplitude loading (VAL)"

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Braun, Moritz, Alfons Dörner, Tom Willems, Marc Seidel, Hayo Hendrikse, Knut V. Høyland, Claas Fischer, and Sören Ehlers. "Fatigue Strength of Fixed Offshore Structures Under Variable Amplitude Loading Due to Wind, Wave, and Ice Action." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78764.

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Abstract Fixed offshore wind turbines are increasingly developed for high latitude areas where not only wind and wave loads need to be considered, but also moving sea ice. Current structural design rules do not adequately consider the effect of ice loading on fatigue life, due to missing studies on fatigue strength of welded joints under combined wind, wave, and ice action. Thus, a methodology to determine combined variable-amplitude loading (VAL) spectra was developed in a previous study. The stress state time-history at an exemplarily selected point in the support structure of an offshore wind energy monopile was translated into a VAL sequence. This sequence is used as an input for fatigue tests of butt-welded joints in the current study. The current study presents the VAL spectrum and the corresponding VAL time series, the results of the fatigue tests and compares them to typical fatigue damage sums for other stress spectra.
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Savkin, A. N., A. A. Sedov, D. S. Denisevich, and K. A. Badikov. "Crack-tip stress distributions under variable amplitude loading." In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083509.

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Ni, Kan. "Random Fatigue Damage Accumulation under Variable Amplitude Loading." In 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
20th AIAA/ASME/AHS Adaptive Structures Conference
14th AIAA. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-1383.

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Lu, Zizi, Jifeng Xu, and Linjuan Wang. "Numerical analysis of fatigue behaviors under variable amplitude loading." In 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-1650.

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Nijssen, R., D. van Delft, and A. van Wingerde. "Alternative fatigue lifetime prediction formulations for variable-amplitude loading." In 2002 ASME Wind Energy Symposium. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-22.

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Barsom, J. M., J. A. Davidson, and E. J. Imholf. "Fatigue Behavior of Spot Welds under Variable-Amplitude Loading." In SAE International Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1985. http://dx.doi.org/10.4271/850369.

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Nijssen, R. P. L., D. R. V. van Delft, and A. M. van Wingerde. "Alternative Fatigue Lifetime Prediction Formulations for Variable-Amplitude Loading." In ASME 2002 Wind Energy Symposium. ASMEDC, 2002. http://dx.doi.org/10.1115/wind2002-22.

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Possible alternative fatigue formulations to predict lifetime under variable-amplitude loading are investigated. Test results of WISPER and WISPERX variable-amplitude tests on a material representative for wind turbine rotor blades are used. All fatigue calculations are performed using Rainflow counting of the WISPER(X) load histories and employing the Miner summation. The formulation of the SN-curve and the constant-life diagram are varied. Commonly, a log-log SN-curve is used in combination with a linear Goodman constant-life relation. However, in previous work, it was found that these formulations overestimate lifetime of specimens subjected to the variable-amplitude WISPER and WISPERX load histories. This previous work suggested that the SN-formulation be changed and also used an alternative constant-life formulation with parallel lines. These formulations and variations on them are investigated. Also, constant-amplitude data for R = 0.1 are included to construct an alternative constant-life diagram. Including R = 0.1 constant-amplitude data in the lifetime predictions for WISPER(X) seems to improve the accuracy of the calculation. The alternative constant-life formulation might remove the non-conservatism from the lifetime prediction and account for the difference in lifetime between WISPER and WISPERX.
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Liu, Xu, Yan-Hui Zhang, and Bin Wang. "Fatigue Performance of Welded Joints Under Variable Amplitude Loading Spectra." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93073.

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Abstract Offshore pipelines are generally subjected to variable amplitude (VA) loading in service due to waves or ocean currents. Welded joints often represent the most critical locations for fatigue cracking. Use of the current fatigue design guidance, for example, BS 7608, to assess fatigue performance of the welded joints in such structure may lead to inaccurate estimates depending on the nature of the VA loading spectrum. Further studies on the effect of VA loading spectra on fatigue performance of welded joints are needed. In this research, both uniaxial and 3-point bending fatigue tests were performed on non-load carrying fillet welded plates under VA loading spectra to investigate the effects of mean stress and the type of VA loading spectra. The influence of plate thickness was also investigated. Test results suggest that the spectrum with a high constant maximum tensile stress (cycling-down) could significantly degrade fatigue performance of welded joints, with the damage parameter D only at around 0.5. The severity of this type of loading spectrum depends on the mean stress level and the plate thickness. An analytical model has been developed to predict fatigue crack propagation (FCP) by considering the interaction of stresses in the loading spectrum. The model considers the impact of the mean stress generated by the preceding load on FCP in the subsequent cycles. FCP predicted by the model shows a good agreement with the experimental data.
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Gloanec, Anne-Lise, Aqmal Syafiq Anis, and Stéphan Courtin. "Influence of Variable Amplitude Fatigue Loading on AISI 304L Stainless Steel." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97243.

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The aim of this work was to study the influence of variable amplitude loading on the fatigue crack initiation and propagation. Low Cycle Fatigue (LCF) tests are conducted, on an AISI type 304L austenitic stainless steel, at different total-strain-amplitudes, in laboratory air at room temperature and with a constant strain rate of 3.10−3 s−1. Two types of signal were used: a conventional signal and a complex signal. The first one was triangular in shape with a negative strain ratio (Rε = −1). The second one is still triangular in shape with Rε = −1, but between the maximum of the total-strain (εmax = +0.6%) and the minimum (εmin = −0.6%), several cycles with a smaller total-strain-amplitude are introduced (with values ranged from 0% to +/− 0.3%). From these tests, several conclusions can be drawn on Cyclic Stress Strain (CSS) behaviour, fatigue life and fracture characteristics.
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Walbridge, Scott. "Fatigue Analysis of Needle Peened Welds under Variable Amplitude Loading Conditions." In Structures Congress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/41016(314)2.

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Reports on the topic "Variable amplitude loading (VAL)"

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Ghonem, Hamouda. Study of Probabilistic Fatigue Crack Growth and Associated Scatter Under Constant-and-Variable Amplitude Loading Spectrum. Fort Belvoir, VA: Defense Technical Information Center, September 1987. http://dx.doi.org/10.21236/ada192027.

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Cullen, W. H., and D. Broek. The effects of variable amplitude loading on A 533-B steel in high-temperature air and reactor water environments. Office of Scientific and Technical Information (OSTI), April 1989. http://dx.doi.org/10.2172/6344408.

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