Relevant bibliographies by topics / Fatigue loads

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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 loads'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Fatigue loads"

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Raue, Erich, and Enrico Tartsch. "EXPERIMENTAL RESULTS OF FATIGUE AND SUSTAINED LOAD TESTS ON AUTOCLAVED AERATED CONCRETE." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 11, no. 2 (June 30, 2005): 121–27. http://dx.doi.org/10.3846/13923730.2005.9636341.

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The fatigue strength of concrete is lower than its static strength. An attempt was made to accelerate the destabilisation process due to microcracking by the application of fatigue loads. The aim of this was to get ready access to information about concrete's sustained loading strength. The fatigue strength of autoclaved aerated concrete (AAC) was observed by applying cyclic loads to unreinforced cylinders. AAC was found to be less sensitive to fatigue loads than lightweight concrete. The fatigue tests were supplemented by tests using sustained loads. It could be assumed that the behaviour under both static and fatigue loads was comparable with that of lightweight and normal concrete. A substantial influence of load duration was found, especially at high load levels.
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Seidel, Marc. "Wave induced fatigue loads." Stahlbau 83, no. 8 (August 2014): 535–41. http://dx.doi.org/10.1002/stab.201410184.

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Zuo, Huang, Yue Chun Zhang, Ping Liu, Wen Wang, and Shun Xiong. "Study on Loads of Accelerated Contact Fatigue Testing and its Application." Applied Mechanics and Materials 86 (August 2011): 680–83. http://dx.doi.org/10.4028/www.scientific.net/amm.86.680.

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For reducing the development time and cost, determining the load of accelerated contact fatigue testing of a multi-case and multi-stage drive train, multilevel design load method was used to calculate the pitting equivalent loads of gears according to the load spectrum. A reasonable load of pitting fatigue testing was determined after analyzing and studying the pitting equivalent loads of gears. Based on a reducer used for a cement mixer, the pitting equivalent loads of gears were calculated, and the load of pitting fatigue testing was determined. The damage ratios of gears were calculated by the pitting equivalent loads of gears and the testing load, separately, using software MASTA. The results from the load of pitting fatigue testing and the testing load were coincident.
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Zhang, Hua. "Load Model of Scroll Wrap for Calculation of Bending Fatigue Strength." Applied Mechanics and Materials 341-342 (July 2013): 496–500. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.496.

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For calculation of bending fatigue strength of scroll wraps, the pressure loads and temperatures in compression chambers based on general profile theory are analyzed, and a load model including the pressure loads the temperatures is proposed. For the scroll wraps, their load model for bending fatigue strength includes the pressure loads and the temperatures. Their pressure loads can be simplified on the mid-areas and its temperatures are equal to the temperatures of the mid-areas. The pressure loads are of π normal angle region inner pressure load which have an interval of π normal angle, the number of regions of pressure load is equal to the number of scroll compression chamber pairs. The discharge angle has significant effect on bending fatigue strength of scroll wraps and the stability of scroll compressor.
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Frantziskonis, George N. "Temporal scaling in fatigue life of materials and incorporation of temporal events in Paris’s law." Journal of the Mechanical Behaviour of Materials 21, no. 5-6 (April 1, 2013): 175–80. http://dx.doi.org/10.1515/jmbm-2013-0005.

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AbstractTemporal scaling in mechanical strength of materials is vital for long-term effects such as fatigue. The fatigue crack length α is related to the change in the stress intensity factor ΔK by the omnipresent Paris’s law, which works well for cyclic fatigue of specific frequency and amplitude. The paper considers time scaling in fatigue and through it incorporates the effects of temporal events such as unexpected or accidental loads, impact loads, and rare events such as earthquake loads. This is achieved by theoretically incorporating the effects of delta-function type loads into fatigue. Since the time-scale decomposition of such a load contains information at all scales, the theoretical framework is easily extended to include general types of loads.
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Skibicki, Dariusz, Janusz Sempruch, and Łukasz Pejkowski. "Steel X2CrNiMo17-12-2 Testing for Uniaxial, Proportional and Non-Proportional Loads as Delivered and in the Annealed Condition." Materials Science Forum 726 (August 2012): 171–80. http://dx.doi.org/10.4028/www.scientific.net/msf.726.171.

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The article presents the results of fatigue life and fractographic testing of steel X2CrNiMo17-12-2 exposed to proportional and non-proportional fatigue loads. The following load types were applied: tension-compressive strength, torsion, proportional combined/complex loads produced by tension-compressive strength and torsion as well as non-proportional combined load – by tension-compressive strength and torsion by the phase shift angle φ=90°. The paper analyses the effect of the load method on the fatigue life and fractography of fatigue fractures recorded, and especially the effect of non-proportional load.
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Tang, Xian Xi, Jin Bao Liang, Yan Peng Zhu, Xian Zhou Tang, and Yue Xu. "Experimental Study on Strain Performance of Tensile Reinforcement under Fatigue Loads." Applied Mechanics and Materials 351-352 (August 2013): 1625–28. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.1625.

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As for the study on the strain performance of tensile reinforcement under the fatigue loads with amplitude of certain values, two groups of reinforced concrete slab bridge specimen were made. The fatigue test was carried out on one group of specimen, and the corresponding static load test was carried out on another group of specimen, the experimental study on the strain performance of tensile reinforcement was carried on bottom of the mid span of slabs. The results of the study shown that, under the fatigue loads at a certain amplitude, the strain performance of the tensile reinforcement tend to be stable with the increase of number of fatigue cycle, the strain value showed certain linear relationship with static load applied. When the fatigue amplitude increased, the change rule of strain with static load value applied was approximately linear, but the strain value increased more than the fatigue amplitude less under the same static load. It could be seen through the comparison of load - strain curve of the static load specimen, after effect of compressive fatigue with certain amplitude, the strain change with load applied was close to linear change, which has great relationship with the effect on concrete and reinforcement plastic deformation by fatigue load. The test results had the vital significance of further research on reinforcement performance under the action of fatigue loads.
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Huang, Bixiong, Shuci Wang, Shuanglong Geng, and Xintian Liu. "Improved numerical model for fatigue cumulative damage of mechanical structure considering load sequence and interaction." Advances in Mechanical Engineering 13, no. 2 (February 2021): 168781402199530. http://dx.doi.org/10.1177/1687814021995309.

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To more accurately predict the fatigue life of components under the action of random loads, it is necessary to explore the influence of the interaction between the load sequence and the load on the life prediction. Based on the Manson-Halford method and Corten-Dolan model, this paper establishes a fatigue cumulative damage model that takes into account both the load order and the interaction between loads, and also takes into account the loads near the fatigue limit. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. The fatigue life of mechanical parts under random load can be calculated through this model, which provides a theoretical basis for life prediction under random load spectrum. Comparing the calculation results of the proposed model with the results of Palmgren Miner, Manson-Halford method, and Corten-Dolan model, it is found that the fatigue damage model established can reasonably predict the fatigue life of parts. Comparison and verification of examples further prove the accuracy and reliability of the proposed model.
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Luo, Shanshan, Peiyan Huang, Xinyan Guo, and Xiaohong Zheng. "Fatigue Performance of SFPSC under Hot-Wet Environments and Cyclic Bending Loads." Advances in Materials Science and Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/5835421.

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A new structural material named “steel fiber polymer structural concrete (SFPSC)” with features of both high strength and high toughness was developed by this research group and applied to the bridge superstructures in the hot-wet environments. In order to investigate the fatigue performance and durability of SFPSC under hot-wet environments, the environment and fatigue load uncoupling method and the coupling action of environment and fatigue load were used or developed. Three-point bending fatigue experiments with uncoupling action of environments and cyclic loads were carried out for SFPSC specimens which were pretreated under hot-wet environments, and the experiments with the coupling action of environments and cyclic loads for SFPSC specimens were carried out under hot-wet environments. Then, the effects of hot-wet environments and the experimental methods on the fatigue mechanism of SFPSC material were discussed, and the environmental fatigue equations of SFPSC material under coupling and uncoupling action of hot-wet environments and cyclic bending loads were established. The research results show that the fatigue limits of SFPSC under the coupling action of the environments and cyclic loads were lower about 15%. The proposed fatigue equations could be used to estimate the fatigue lives and fatigue limits of SFPSC material.
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Chen, Zhi Wei, and Jian Gang Wu. "Study on Generalized Fatigue Damage under Random Loading." Key Engineering Materials 324-325 (November 2006): 1161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1161.

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Generalized fatigue damage is derived based on S-N curve under constant amplitude loads with S characterizes the load cycle by the combination of load peak and load amplitude. For random fatigue loads, a natural choice is to use half cycle (Range) counting method. Rain Flow counting is popular due to its useful nature to pick-out full cycles among random loads. It is found in the present research through analysis and verified by experimental results that Rain Flow counting seriously overestimate the damage for the actual true random loads owing to its inherent nature and the Range counting method is more reliable. As the filtering threshold increases gradually, the overestimation effect by Rain Flow counting method becomes less, and the calculated damages by Rain Flow and Range counting begin to converge. The filtering threshold damage corresponding to the “fatigue limits” for the concerned case was calculated. According to equal damage principle, the filtering threshold amplitudes were derived and found to vary with the load peaks. In practice, an acceptable solution is to use quasi-variable filtering thresholds.
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Dissertations / Theses on the topic "Fatigue loads"

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Svensson, Niklas. "Fatigue Analysis with Loads from MBS." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168720.

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Detta examensarbete har utförts i samarbete med Scania CV AB, en lastbils- och busstillverkare. Scania tror att en stor del i att behålla en ledande position är att erbjuda sina kunder pålitlighet, bland annat i form av livslängd. På grund av detta så är utbyggnad av kompetens och kunskap kring utmattningsanalys alltid aktuellt. Simuleringsdriven produktutveckling har dessutom ökat intresset för simuleringar tidigare i produktutvecklingen. Detta skapar nya utmaningar då det kräver att utmattningsanalyser utförs innan en fysisk prototyp finns. Då laster krävs för utmattningsanalyser är en tänkbar lösning att skapa lastfall med multibody simulations (MBS) med virtuella prototypfordon körandes en virtuell provbana.Huvudsyftet med detta arbete är att undersöka potentialen för att utföra analyser med laster från MBS. Fyra olika analysmetoder, som används inom Scania, har utförts med laster från MBS istället för från provbana. En utvärdering av metodernas robusthet och deras resultat jämfört med resultat från testrigg var tänkt att ge en indikation för vilken virtuell metod som har störst potential. Ett rammonterat inverterfäste som gått sönder i testrigg analyserades under arbetet. En modell av komponenten genererades i Abaqus och importerades i Adams för MBS. Laster som uppmättes i Adams användes för att utföra de olika utmattningsanalyserna.Det visade sig att två metoder var mer lovande än övriga: Dynamisk simulering med PSD och Superposition av modala spänningar. Men, utmattningsuppskattningarna från de genererade lasterna överensstämde inte med utfallet från det fysiska testet. I testrigg gick komponenten sönder medan analyserna indikerade att den inte skulle komma nära utmattningsbrott. Genom att jämföra lastsignalerna från testrigg och MBS uppdagades det att signalerna avvek kraftigt från varandra. Analys med testriggsignal indikerade att komponenten skulle gå sönder, vilket den också gjorde. Användande av lastsignalen från provbanan ledde däremot till ungefär samma skada som analyserna med MBS gav.Dessa resultat indikerar att det finns potential för utmattningsanalyser med virtuellt anhållna laster. Vidare undersökningar med ytterligare komponenter behöver dock genomföras innan definitiva slutsatser kan dras. Att utröna anledningen till att provet i testrigg varit tuffare än verkligheten är också av intresse.
Scania is a truck and bus developer. They believe that reliability, which is strongly associated with life length, has been critical in achieving a leading position and is key to retaining it. Therefore, there is a continuous drive to increase their capability to simulate life length, specifically fatigue. Additionally, the recent popularity of simulation driven product development has created an additional interest in performing simulations earlier in the product development process. This creates a challenge since it requires fatigue analyses to be performed before prototype vehicles are available. Since loads are required for fatigue analyses, one solution is to perform a multibody simulation (MBS) of a virtual prototype vehicle on a virtual test track and derive load cases.This thesis investigated the possibility of using loads derived from MBS simulations to perform fatigue analyses. Four different simulation methods which are currently used by Scania were evaluated with MBS loads instead of physically measured loads. By comparing the methods’ results to those of physical tests, the virtual methods with the greatest potential were identified. A chassis mounted inverter bracket was analyzed in this work. The component was modeled in Abaqus, a model which then was merged into a complete bus model in Adams. Next, this model was run as an MBS over the virtual test track and load data was extracted. The component was then analyzed with different fatigue analysis methods, with the data from the MBS used as input. The fatigue results were then compared with the results of a physical shake rig test of the same component.Two methods were found to be most promising: Dynamic simulation with PSD and Superposition of modal stresses. Interestingly, the fatigue estimation for these methods substantially differed from the outcome of the physical test. The component failed in the physical test but according to the simulation it should have survived. Upon further investigation, it was found that the component was subjected to higher loads in the shake rig than on the shake track. A fatigue simulation using the signal from the shake rig agreed with the outcome of the physical test, namely failure. Analysis using the figures from the test track gave values similar to the results for analyses with MBS loads.These results suggest that this type of virtual analysis has potential. But before more definite conclusions can be drawn further investigations with more than one component need to be performed. Another path of investigation is to look at why the shake rig test is more severe than the virtual shake track.
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Hajigholi, Pedram. "Optimal block loads of dynamic load history for fatigue durability testing." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67746.

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During a vehicle’s life it is experiencing complex loading from both driving and road conditions. This accumulating of loading might be damaging to the vehicle, leading to possible material fatigue cracking, hence it is a major importance to take it into account. During the design phase the vehicle will be tested on a rig to check the durability and fatigue life. This is done on the system as a whole or at component level. But as it is difficult to reproduce the actual complex loading, a much simpler loading sequence is applied on the component(s) during these tests. The purpose of this master thesis is to use an optimization software called HEEDS, which is based on a mathematical model that is applied in the software, to identify a possible multi-level block sequence which would generate the same fatigue damage as the reference complex loading sequence. This work is fully performed in calculation software, without using actual physical testing. The selected component is a front suspension low control arm (LCA) for which life is checked at various locations. The objective is to have the relative error identified as a relative ratio.
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Perng, Horng-Linn. "Damage accumulation in random loads." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184822.

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An equivalent constant amplitude fatigue loading (Miner's stress) is developed for stationary random amplitude loadings. The effects of rainflow cycle counting and fatigue crack closure are included. A method for determining the opening stress in a random loading is also proposed. This research takes a fatigue damage factor approach. The damage factor is defined as the ratio of the wide band rainflow fatigue damage to the equivalent narrow band fatigue damage. The mathematical form of the damage factor equations is derived from theoretical derivations using the analytically tractable local range cycle counting method. Simulations of stationary Gaussian random processes are used to empirically derive the values of certain parameters dependent on the spectral shape for the rainflow cycle counting equations. There are five tasks in this research. (1) A simulation program for generating a Gaussian process has been written and is used to generate random loading histories for this study. (2) A previously proposed rainflow damage factor has been verified and refined with these simulations, without considering crack closure. (3) Using a sinusoidal approximation, the joint probability density functions between peaks, valleys and rises counted by the local range method are derived. (4) The resulting joint probability distributions are used to determine the theoretical damage with crack closure; simulations are again used to calibrate the parameters for rainflow stress cycles. (5) A procedure for finding an equivalent constant fatigue crack opening stress for stationary random loadings is described. An example application of the procedures and equations is given.
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Reytier, Thomas. "Modelling fatigue spectra of aircraft structure under gust loads." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1614/.

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Cette thèse est consacrée à l'analyse de fatigue et de tolérance aux dommages des structures d'avions soumis aux rafales de vent. L'analyse de fatigue et de tolérance aux dommages est un enjeu essentiel dans la conception des structures d'avions. Elle permet de définir un programme d'inspection de la structure afin d'assurer sa sécurité tout au long de la vie de l'avion. La première partie passe en revue l'état de l'art dans les différents domaines impliqués dans le processus global d'analyse de fatigue des structures d'avions soumis aux rafales de vent: la modélisation de la turbulence atmosphérique, le calcul des charges et des contraintes à l'aide d'analyses par éléments finis, la construction du spectre de fatigue et enfin, l'analyse de fatigue et de tolérance aux dommages. La deuxième partie présente le processus complet actuellement implémenté au sein d'Airbus. Les points forts et les points faibles de ce processus sont d'identifiés et permettent de dégager des axes d'amélioration. A partir du modèle de turbulence continue basé sur la densité spectrale de puissance (DSP) de Von Karman, les contraintes calculées sont insérées selon des statistiques établies par des mesures envol dans le spectre de fatigue pour former une séquence de cycles de contraintes. Les données d'entrée pour l'analyse de fatigue et tolérance aux dommages sont obtenues à partir de la définition des différents profils de mission, des valeurs de contraintes unitaires, de la réponse dynamique de la structure et des statistiques de turbulence. Dans la troisième partie, une nouvelle méthodologie est présentée afin d'obtenir des séquences temporelles des contraintes dues à la turbulence de manière précise et efficace. Cette méthode s'appuie sur de nouveaux résultats permettant de générer des signaux temporels corrélés à partir des DSP. Tout d'abord, les DSP des différentes composantes des contraintes sont directement obtenues à l'aide d'une analyse par éléments finis à partir de la DSP de Von Karman. Puis, les séquences temporelles corrélées de ces contraintes sont générées et sont ensuite distribuées dans le spectre de fatigue selon la loi statistique de l'intensité de la turbulence atmosphérique. Ce nouveau processus permet d'améliorer le calcul des contraintes et la génération du spectre de fatigue. Il remplace les statistiques de turbulence par des statistiques de franchissement de niveaux de contraintes raisonnablement conservatives définies par une formule analytique. De plus, le temps de livraison des données d'entrée pour l'analyse de fatigue et tolérance aux dommages est significativement réduit. Les résultats présentés, issus de l'analyse de fatigue et de tolérance aux dommages, permettent de souligner la qualité des améliorations apportées à la fois en termes de précision et de durée du processus
This thesis is dedicated to the fatigue and damage tolerance analysis of the aircraft structures under gust loads. The fatigue and damage tolerance analysis is a significant issue in the aircraft structure design. It aims at defining the inspection program of the aircraft structure in order to ensure its safety through its entire life. The first part reviews the state-of-the-art in the various involved topics for the global process for fatigue analysis of aircraft structure under gust loads: the atmospheric turbulence modelling, the load and stress computation by a finite element analysis, the generation of the fatigue spectrum and at the end, the fatigue and damage tolerance analysis. The second part presents the whole process currently implemented at Airbus. The main strengths and weaknesses are pointed out and this en-ables the identification of several improvement axes. From the continuous turbulence model based on the Von Karman Power Spectral Density(PSD), the computed stresses are included according to statistics established from in-flight measurements in the fatigue spectrum in order to build a stress cycle sequence. The input data for the fatigue and damage tolerance analysis are obtained from the definition of the various fatigue mission profiles, the unitary stress values, the dynamic response of the structure and the turbulence statistics. In the third part,a new methodology is presented in order to obtaine efficiently and accurately the temporal stress sequences due to the atmospheric turbulence. This method relies on new results enabling the generation of correlated time signals from the PSD functions. First, the PSD of the various stress components are directly obtained from the Von Karman PSD via a finite element analysis. Then, the correlated temporal stress sequences are generated and distributed in the fatigue spectrum according to the turbulence intensity statistical law. This new process enables the improvement of the stress computation and the fatigue spectrum generation. It replaces the turbulence statistics by stress exceedance statistics which are defined by an analytical formula in a reasonably conservative way. In addition, the lead time to build the input data for the fatigue and damage tolerance analysis is significantly reduced. Results from the fatigue and damage tolerance analysis are presented in order to highlight the quality of the improved processes both in terms of accuracy and lead time
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Bulusu, Prashant. "Rolling contact fatigue predictions based on elastic-plastic finite element stress analysis and multiaxial fatigue /." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1437664.

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Thesis (M.S.)--University of Nevada, Reno, 2006.
"August, 2006." Includes bibliographical references (leaves 38-45). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2006]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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Ek, Therese. "Fatigue analysis of engine brackets subjected to road induced loads." Thesis, KTH, Hållfasthetslära (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193564.

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In this master thesis, methods for fatigue analysis of front engine brackets subjected to road induced gravity loads (g-loads) are studied. The objective of the thesis is to investigate the possibility to improve simulation and test analysis for the components. The powertrain is modeled with varying degrees of complexity and the different models are compared to each other and to Scania's models for analysis of the engine suspension. The analysis begins with g-loads and proceeds with time-dependent loads. It is investigated how simulated strains in the cylinder block correspond to measured strains from the test track at Scania. Finally, it is investigated how component tests corresponds to actual loads by comparing the results. The results from the first part of the thesis indicate that worst load case is loading in the negative z -direction and the model of the powertrain with isolators modelled as spring elements is the best for g-loads lower than -3g and the model is sufficient for loads lower than -8g. The results from the second part of the thesis indicate that the simulated strains generally correspond to the measured strains, but with a slight difference in strain amplitude.
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Juneja, Lokesh Kumar. "Multiaxial fatigue damage model for random amplitude loading histories." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/41522.

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In spite of many multiaxial fatigue life prediction methods proposed over decades of research, no universally accepted approach yet exists. A multiaxial fatigue damage model developed for approximately proportional random amplitude loading is proposed in this study. A normal strain based analysis incorporating the multiaxial state of stress is conducted along a critical orientation assuming a constant strain ratio. The dominant deformation direction is chosen to be the critical orientation which is selected with the help of a principal strain histogram generated from the given multiaxial loading history. The uniaxial cyclic stress-strain curve is modified for the biaxial state of stress present along the critical orientation for the plane stress conditions. Modified versions of Morrow's and of Smith, Watson, and Topper's (SWT) mean-stress models are used to incorporate mean stresses. A maximum shear strain based analysis is, in addition, conducted to check for the shear dominant fatigue crack growth possibility along the critical direction. The most damaging maximum shear strain is chosen after analyzing the in-plane and the two out-of-plane shear strains.

The minimum of the two life values obtained from SWT model and the shear strain model is compared with the life estimated by the proposed model with the modified Morrow's mean stress model. The former is essentially the life predicted by Socie. The results of the proposed model, as reduced to the uniaxial case, are also compared with the experimental data obtained by conducting one-channel random amplitude loading history experiments.
Master of Science

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Bakis, Charles E. "Fatigue behavior of notched carbon epoxy laminates during reversed cyclic loads." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53903.

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The relationships between fatigue damage, stress redistribution, and residual stiffness and strength were investigated for notched graphite epoxy laminates during fulIy-reversed cyclic loads. Two material systems, AS4/3501-6 and AS4/1808, two lamination arrangements, (0,45,90,-45)s₄ and (0,45,0,-45)s₄, and two notch configurations, central hole and opposing semi-circular edge notches, were used to obtain a fundamental understanding of the fatigue effect in specimens under low and high cycle lifetimes. Damage was evaluated with penetrant-enhanced X-ray radiography and Iaminate deply. Tensile and compressive residual strengths were measured at three stages of damage development. A recently developed nondestructive testing technique, Stress Pattern Analysis by Thermal Emission, was implemented to obtain full-field measurements of surface stresses during damage initiation and growth. A new micromechanical theory of the adiabatic thermoelastic effect in Iaminated fiber composites was conceived to assist the interpretation of SPATE measurements.
Ph. D.
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Mohammadi, Mohammad Mehdi. "PREDICTION OF WIND TURBINE BLADE FATIGUE LOADS USING FEED-FORWARD NEURAL NETWORKS." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444115.

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In recent years, machine learning applications have gained great attention in the wind power industry. Among these, artificial neural networks have been utilized to predict the fatigue loads of wind turbine components such as rotor blades. However, the limited number of contributions and differences in the used databases give rise to several questions which this study has aimed to answer. Therefore, in this study, 5-min SCADA data from the Lillgrund wind farm has been used to train two feed-forward neural networks to predict the fatigue loads at the blade root in flapwise and edgewise directions in the shape of damage equivalent loads.The contribution of different features to the model’s performance is evaluated. In the absence of met mast measurements, mesoscale NEWA data are utilized to present the free flow condition. Also, the effect of wake condition on the model’s accuracy is examined. Besides, the generalization ability of the model trained on data points from one or multiple turbines on other turbines within the farm is investigated. The results show that the best accuracy was achieved for a model with 34 features, 5 hidden layers with 100 neurons in each hidden layer for the flapwise direction. For the edgewise direction, the best model has 54 features, 6 hidden layers, and 125 neurons in each hidden layer.For a model trained and tested on the same turbine, mean absolute percentage errors (MAPE) of 0.78% and 9.31% are achieved for the flapwise and edgewise directions, respectively. The seen difference is argued to be a result of not having enough data points throughout the range of edgewise moments. The use of NEWA data has been shown to improve the model’s accuracy by 10% for MAPE values, relatively. Training the model under different wake conditions did not improve the model showing that the wake effects are captured through the input features to some extent. Generalization of the model trained on data points from one turbine resulted in poor results in the flapwise direction. It was shown that using data points from multiple turbines can improve the model’s accuracy to predict loading on other turbines.
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Jonk, Eric Frederick. "A comparison between two methods of fatigue lifetime predictions for random loads." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26302.

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The purpose of this thesis is to compare the results obtained from two different methods to account for fatigue, the Root Mean Square (RMS) and the Histogram, to determine which method better represents reality. The test procedure used subjected compact tension specimens to randomly selected block loads, then compared the actual lifetimes obtained by experiment to the lifetimes predicted by the methods. A statistical analysis was attempted to determine which method was superior. The results of the analysis suggest that the RMS model is superior. However, no firm conclusions can be drawn, since the data obtained suggest that the Paris Law parameters used in the analysis are possibly biased.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Books on the topic "Fatigue loads"

1

North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Impact of acoustic loads on aircraft structures. Neuilly-sur-Seine, France: AGARD, 1994.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Impact of acoustic loads on aircraft structures. Neuilly sur Seine, France: AGARD, 1994.

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Mabson, Gerald E. Spectrum fatigue model for composite laminates. [S.l.]: [s.n.], 1986.

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Mei, C. Prediction of response of aircraft panels subjected to acoustic and thermal loads. Norfolk, Va: Old Dominion University Research Foundation, Dept. of Mechanical Engineering and Mechanics, College of Engineering and Technology, Old Dominion University, 1992.

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Ganczakowski, H. L. On the modulus of KFRP laminates in static and fatigue loading. Cambridge, U.K: Cambridge University, 1987.

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W. G. J. 't Hart. Fatigue damage in composites under different loading conditions. Amsterdam: National Aerospace Laboratory, 1988.

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Finney, J. M. The influence of load cycle reconstitution on fatigue behaviour. Melbourne, Australia: Aeronautical Research Laboratories, 1986.

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Bakis, Charles E. Fatigue response of notched laminates subjected to tension-compression cyclic loads. Blacksburg, Va: Virginia Polytechnic Institute and State University, 1986.

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Carden, Huey D. Failure behavior of generic metallic and composite aircraft structural components under crash loads. Washington, D.C: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Mei, C. Influence of large deflection and transverse shear on random response of rectangular symmetric composite laminates to acoustic loads. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

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Book chapters on the topic "Fatigue loads"

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Richard, Hans Albert, and Manuela Sander. "Fatigue Crack Growth Under Service Loads." In Fatigue Crack Growth, 187–221. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32534-7_6.

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Rychlik, I. "Characterization of Random Fatigue Loads." In Stochastic Approach to Fatigue, 35–78. Vienna: Springer Vienna, 1993. http://dx.doi.org/10.1007/978-3-7091-2622-6_2.

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Petinov, Sergei V. "Service Loads on Structures." In In-Service Fatigue Reliability of Structures, 35–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89318-1_4.

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Gdoutos, E. E. "Thermal Loads in a Pipe." In Problems of Fracture Mechanics and Fatigue, 193–95. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2774-7_42.

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Köhler, Michael, Sven Jenne, Kurt Pötter, and Harald Zenner. "Multiaxial Loads and Stresses." In Load Assumption for Fatigue Design of Structures and Components, 93–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-642-55248-9_6.

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Dvorak, George J., Dimitris C. Lagoudas, and Chien-Ming Huang. "Shakedown and Fatigue Damage in Metal Matrix Composites." In Inelastic Analysis of Structures under Variable Loads, 183–96. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-9421-4_12.

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Kensche, C., and H. Seifert. "Wind Turbine Rotor Blades under Fatigue Loads." In Developments in the Science and Technology of Composite Materials, 173–80. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0787-4_21.

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Dang Van, Ky. "Application of Shakedown Theory to Fatigue Analysis of Structures." In Inelastic Behaviour of Structures under Variable Repeated Loads, 377–93. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2558-8_18.

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Mathiak, F. U., F. A. Fuchs, W. Ott, K. H. Trautmann, E. Maldfeld, and H. Nowack. "Constitutive Equations for Elastic-Plastic Material Behaviour Under Extremely High Multiaxial Loads and Fatigue Loads." In Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3, 418–23. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2860-5_67.

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Cangiano, S., and G. A. Plizzari. "Fatigue Behavior of Fiber Reinforced Concrete: Comparison between Material and Structural Response." In Inelastic Analysis of Structures under Variable Loads, 315–34. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-9421-4_19.

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Conference papers on the topic "Fatigue loads"

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Ommani, B., H. Lie, V. O. Aksnes, N. Fonseca, P. A. Berthelsen, and S.-A. Reinholdtsen. "Extreme Wave Loads on Semi-Submersible Platform Columns, A Case Study." In Structural Load & Fatigue on Floating Structures 2015. RINA, 2015. http://dx.doi.org/10.3940/rina.slf.2015.02.

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Bultema, Stephen, Henk van den Boom, and Max Krekel. "FPSO Integrity: JIP on FPSO Fatigue Loads." In Offshore Technology Conference. Offshore Technology Conference, 2000. http://dx.doi.org/10.4043/12142-ms.

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Tibbits, Patrick. "Fatigue Load Equivalent to Distribution of Loads From the US Population." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35678.

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In seeking to simplify fatigue life calculations for components of fitness equipment, this paper develops a general expression for the user weight Le which, in NT cycles, generates the same fatigue damage as a set of user weights {Li} described by a probability density function fi = Ni/NT, where each Li gets applied for Ni cycles and Σ Ni = NT. The derivation of the method goes beyond the textbook development of equivalent load by retaining geometric, material, and loading parameters throughout the derivation. The expression allows exploration of the effect of the geometry of the mechanical component, material properties, and loading on the value of the user weight Le which simulates the set of user weights {Li}. The paper explores a range of stress-life exponent b typical of common steels. The paper explores the complete range of stress ratio R ∈ (-1, 1). The paper explores the combined effect of the component’s ultimate tensile strength and the ratio between applied load and stress. These last two parameters determine the user weight Lb which causes single-cycle fracture of the component. The results indicate a strong dependence of Le on stress ratio R, stress-life exponent b, and on breaking weight Lb. The paper proposes guidelines for assignment of Le in the special case where the {Li} arise from body weights of the US population.
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Huang, Wenbo, and Torgeir Moan. "Fatigue Under Combined High and Low Frequency Loads." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92247.

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Based on Gaussian load processes, a new formula suitable for evaluating the combined fatigue damage due to high and low frequency loads is derived. Then, by using of the Winterstein’s transformation, the developed formula is extended for the combination of non-Gaussian loads. The numerical simulation shows that the predicted damage by the derived formula is very simple to use and close to the rain-flow prediction.
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Reina˚s, Lorents, Torfinn Ho̸rte, Morten Sæther, and Guttorm Gryto̸yr. "Wellhead Fatigue Analysis Method." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50026.

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Re-completion and re-drilling of existing wells and introduction of new large drilling rig systems are elements that have led to renewed focus on the fatigue capacity for existing and new subsea wells. Due to lack of applicable codes and standards for such fatigue calculations, a unified analysis methodology has been developed and described in a Wellhead Fatigue Analysis Method Statement (MS). The intention of this work is to reflect the best practice in the industry and to provide an important contribution to well integrity management. The analysis methodology is limited to fatigue damage from dynamic riser loads present during subsea drilling and work over operations. The analysis procedure may be divided into three parts. i) A local response analysis that includes a detailed finite element model from wellhead datum and below. Interaction between the structural well components and soil structure interaction is properly accounted for. The main result from this analysis is the load-to-stress curve that describes the relationship between the riser loads at the wellhead datum and the stress at the fatigue hot spots. The analysis also provides the lower boundary conditions of the global load analysis model. ii) A global load analysis where the floating mobile drilling unit (MODU) motions and wave loads on the riser are taken into account. The results are time series or load histograms of the loads at wellhead datum, with focus on the bending moment, in all relevant environmental sea states. iii) Fatigue damage assessment, where a mapping of the loads with the relevant load to stress curve is carried out together with subsequent fatigue damage calculation. Appropriate S-N curve is applied together with wave scatter diagrams for the relevant operations and durations. The final result is the accumulated fatigue damage. With a unified analysis methodology in place particular attention is placed on a structured and specified analysis input and output. Results are suggested presented as a function of time and also as a function of key analysis input parameters that are associated with uncertainty. These are prerequisites from a well integrity management perspective in ensuring analysis results that are comparable. This paper presents the essence of the Wellhead Fatigue Analysis Method that was developed in cooperation between Statoil and DNV. Currently this analysis methodology is under extension and revision in the joint industry project (JIP) “Structural Well Integrity During Well Operations”. 11 operators participate in this JIP which also has structured cooperation with equipment suppliers, drilling companies and analysis houses. The aim is to form a wellhead analysis recommended practice document.
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Austin, Fred, Theodore Balderes, and Dino George. "Optimum jack loads for static and fatigue tests." In Aircraft Engineering, Technology, and Operations Congress. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-3988.

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Dale, Travis, Yuvraj Singh, Ian Bernander, Ganesh Subbarayan, Carol Handwerker, Peng Su, and Bernard Glasauer. "Fatigue Life of Sn3.0Ag0.5Cu Solder Alloys Under Combined Shear and Compressive Loads." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6507.

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Abstract Solder joints in electronic assemblies experience damage due to cyclic thermomechanical loading that eventually leads to fatigue fracture and electrical failure. While solder joints in smaller, die-sized area-array packages largely experience shear fatigue due to thermal expansion mismatch between the component and the substrate, larger area-array packages experience a combination of cyclic shear and axial tensile/compressive loads due to flexure of the substrate. Additionally, on larger processor packages, the attachment of heatsinks further exacerbates the imposed axial loads, as does package warpage. With the increase in size of packages due to 2.5D Heterogeneous integration, the above additional axial loads can be significant. Thus, there exists a critical need to understand the impact on fatigue life of solder joints with superposed compressive/tensile loads on the cyclic shear loads. In this paper, we describe a carefully constructed microscale mechanical tester as well as fatigue test results on Sn3.0Ag0.5Cu (SAC305) solder joints subjected to controlled cyclic shear and constant compressive loads. The tester design allows one to apply cyclic shear loads up to 200 N while maintaining a constant axial load of up to 38 N in tension or compression. The tester is capable of maintaining the compressive load to within a tolerance of +/− 0.5 N during the entirety of fatigue experiment. Carefully constructed samples of Sn3.0Ag0.5Cu solder joints were isothermally fatigued under systematically increased compressive load imposed on the sample subject to repeated loading (R = 0) under lap-shear. In general, the imposition of the superposed compressive load increases the fatigue life of the solder joint compared to application of pure cyclic shear load. At larger compressive loads, friction between fractured surfaces is responsible for significant energy dissipation during the cyclic load-unload cycles.
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Dick, Matthew G., David S. McConnell, and Hans C. Iwand. "Experimental Measurement and Finite Element Analysis of Screw Spike Fatigue Loads." In ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/jrc/ice2007-40090.

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Screw spikes, also known as coach screws, are an advanced alternative to common cut spikes for track fastening. Despite their ability to secure tie plates with a clamp load and utilization of high strength steels, they are still susceptible to bending fatigue failure from lateral wheel loads. A novel method of measuring these bending loads on screw spikes was developed and implemented to characterize the load environment of the screw spikes. Results indicated that measured peak bending loads under lateral wheel loads reached as high as 10,000 lbs for individual spikes, while others carried no load whatsoever. A finite element model was developed to determine the tensile stress fields created by the measured bending loads. A good correlation was found between the FEA model predicted point of highest stress and the location of fracture. Through the testing and analysis it was determined that lateral wheel loads are not distributed evenly among the four screw spikes of a single tie plate. Instead, it was found that one spike carried nearly no load while the spike opposite of it carried more load. Using the finite element analysis it was determined that the spike exposed to the higher loading was subjected to tensile stresses above its endurance limit, which would eventually lead to a bending fatigue failure.
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Parihar, Yogendra, Saikat Dan, Karan Doshi, and Shivaji Ganesan Thirunaavukarasu. "Application of Direct Hydrodynamic Loads in Spectral Fatigue Analysis." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61907.

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It is common practice to employ direct calculation procedures for spectral based fatigue assessment. Numerical codes are used to compute direct hydrodynamic loads. There are several complexities and nuances associated with application of loads on finite element (FE) model. It is a computationally expensive task especially when a large number of cases need to be analyzed (for e.g. spectral fatigue analysis). The present paper outlines an approach to evaluate the stress transfer function based on the direct application of moments (vertical bending, horizontal bending and torsional moments) computed using a frequency-domain based sea-keeping code. Multi-point constraint (MPC) method is utilized for application of bending moment. The structural responses computed using direct application of the bending moments (Method 1) and the panel pressures (Method 2) are compared. The evaluated stress transfer function is used for spectral fatigue analysis. Overall, the present study provides a methodology for spectral fatigue assessment using direct application of bending moments.
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Rajpal, Darwin, Christos Kassapoglou, and Roeland De Breuker. "Aeroelastic Optimization of Composite Wings Subjected to Fatigue Loads." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0227.

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Reports on the topic "Fatigue loads"

1

Jha, Alok K. Nonlinear Ship Loads and Ship Fatigue Reliability. Fort Belvoir, VA: Defense Technical Information Center, June 1997. http://dx.doi.org/10.21236/ada390629.

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Moriarty, P. J., W. E. Holley, and S. P. Butterfield. Extrapolation of Extreme and Fatigue Loads Using Probabilistic Methods. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/15011693.

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Chen, P. C., Xiaowei Gao, D. D. Liu, and M. P. Mignolet. Rapid Fatigue Life Projection for Thermal and Acoustic Loads. Fort Belvoir, VA: Defense Technical Information Center, July 2003. http://dx.doi.org/10.21236/ada420786.

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Chotickai, Piya, and Mark Bowman. Fatigue of Older Bridges in Northern Indiana Due to Overweight and Oversized Loads, Volume 2 : Analysis Methods and Fatigue Evaluation. West Lafayette, IN: Purdue University, 2006. http://dx.doi.org/10.5703/1288284314221.

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Chotickai, Piya, and Mark Bowman. Fatigue of Older Bridges in Northern Indiana due to Overweight and Oversized Loads - Volume 2: Analysis Methods and Fatigue Evaluation. West Lafayette, IN: Purdue University, 2006. http://dx.doi.org/10.5703/1288284313457.

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NAVAL AIR SYSTEMS COMMAND PATUXENT RIVER MD. Procedures For Submitting Flight Loads, Launch, and Landing Data for the Structural Appraisal of Fatigue Effects Program. Fort Belvoir, VA: Defense Technical Information Center, November 2000. http://dx.doi.org/10.21236/ada384646.

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NAVAL AIR SYSTEMS COMMAND PATUXENT RIVER MD. Procedures for Submitting Flight Loads, Launch, and Landing Data for the Structural Appraisal of Fatigue Effects Program. Fort Belvoir, VA: Defense Technical Information Center, February 1999. http://dx.doi.org/10.21236/ada384654.

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Reisert, James, and Mark Bowman. Fatigue of Older Bridges in Northern Indiana due to Overweight and Oversized Loads, Volume 1: Bridge and Weigh-In-Motion Measurements. West Lafayette, IN: Purdue University, 2006. http://dx.doi.org/10.5703/1288284313378.

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Reisert, James, and Mark Bowman. Fatigue of Older Bridges in Northern Indiana due to Overweight and Oversized Loads - Volume 1: Bridge and Weigh-In-Motion Measurements. West Lafayette, IN: Purdue University, 2006. http://dx.doi.org/10.5703/1288284313458.

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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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