Thematische Bibliographien / Ultrasonic fatigue tests

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Auswahl der wissenschaftlichen Literatur zum Thema „Ultrasonic fatigue tests“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 12. Februar 2022

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Zeitschriftenartikel zum Thema "Ultrasonic fatigue tests"

XUE, H., D. WAGNER, N. RANC und E. BAYRAKTAR. „Thermographic analysis in ultrasonic fatigue tests“. Fatigue Fracture of Engineering Materials and Structures 29, Nr. 7 (Juli 2006): 573–80. http://dx.doi.org/10.1111/j.1460-2695.2006.01024.x.

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Kasap, S. O., S. Yannacopoulos, V. Mirchandani und J. R. Hildebrandt. „Ultrasonic Evaluation of Thermal Fatigue of Composites“. Journal of Engineering Materials and Technology 114, Nr. 2 (01.04.1992): 132–36. http://dx.doi.org/10.1115/1.2904151.

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Results are presented on the evaluation of thermally fatigued E-glass composite specimens using ultrasonic techniques. The changes of the acoustic velocity and the attenuation coefficient in the ultrasonic range have been examined as a function of accumulated damage in various thermally fatigued composites. Three types of E-glass fiber reinforced composites have been used in this study having the following fiberglass weaves: (a) randomly oriented short fiber, (b) uniaxial fiber mat with continuous fiber bundles, (c) bidirectional continuous glass fiber mat. Representative specimens were subjected to thermal fatigue by thermal cycling between 25°C and 75°C. The structural integrity of these specimens was evaluated by determining the flexural strength after a number of thermal cycles via three point bending tests. It was observed that both the acoustic velocity and the flexural strength decreased whereas the ultrasonic attenuation increased with the number of thermal cycles which have been attributed to an accumulation of defects in the material and especially to debonding at the fiber-matrix interface. It has been observed that the use of ultrasonics may be very appropriate in evaluating composites in service since a good correlation has been noted between changes in the flexural strength, acoustic velocity and the attenuation coefficient in thermally fatigued composites.

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Peng, Wen Jie, Bao Wen Qiu, Rong Feng Li und Huan Xue. „Ultrasonic Fatigue Tests on a High Strength Steel for Welded Structure“. Advanced Materials Research 503-504 (April 2012): 714–17. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.714.

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In this paper, the ultrasonic fatigue machine which works at frequency of 20kHz is utilized to conduct the ultrasonic fatigue tests on a high strength welding structural steel with symmetric cycle stress R=－1 at room temperature. Two typical specimen geometries are tested: smooth specimen and notch specimen. The fatigue tests of smooth specimen are also carried out on the electromagnetic resonance equipment at conventional frequency. A comparison is made between the fatigue test results at the ultrasonic and conventional frequency.

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Yamane, K., Norio Kawagoishi, Kazuhiro Morino und K. Fukada. „Ultrasonic Fatigue of Radical Nitrided Ni-Base Superalloy“. Key Engineering Materials 417-418 (Oktober 2009): 209–12. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.209.

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Ultrasonic and rotating bending fatigue tests were carried out for aged and nitrided Ni-base super alloys to investigate the effects of loading frequency and nitriding on fatigue strength. Loading frequencies were 19.5 kHz under ultrasonic and 50 Hz under rotating bending, respectively. Fatigue strength under ultrasonic was higher than that under rotating bending in both alloys. Moreover, in both tests, fatigue strength was improved by nitriding. The increase in fatigue strength by nitriding was large in ultrasonic fatigue. These results were discussed through the successive observation of fatigue process at specimen surface and fracture surface observation.

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Fukudome, T., Norio Kawagoishi und K. Kariya. „Effect of Humidity on Fatigue Strength of Age-Hardened Al Alloy“. Key Engineering Materials 417-418 (Oktober 2009): 373–76. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.373.

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Ultrasonic and rotating bending fatigue tests were carried out using plain specimens and specimens with a small blind hole for an extruded and age-hardened Al alloy 7075-T6 in different environments in order to investigate the effect of humidity on fatigue strength and fracture mechanism. Fatigue strength was decreased by high humidity under both tests. The effect of humidity on fatigue strength was larger in ultrasonic fatigue. The humidity affected both of crack initiation and propagation processes. Crack propagated in tensile mode then changed to shear mode macroscopically in all environments under ultrasonic fatigue, though it was only in tensile mode under rotating bending fatigue. These differences in fracture mechanism related to the difference in environmental effect on fatigue strength in both tests.

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Dominguez Almaraz, Gonzalo M., Manuel Guzmán Tapia und Alexiane Dominguez. „Ultrasonic Fatigue Tests on the Inconel Alloy 718“. Procedia Structural Integrity 26 (2020): 20–27. http://dx.doi.org/10.1016/j.prostr.2020.06.004.

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Fitzka, Michael, Bernd M. Schönbauer, Robert K. Rhein, Niloofar Sanaei, Shahab Zekriardehani, Srinivasan Arjun Tekalur, Jason W. Carroll und Herwig Mayer. „Usability of Ultrasonic Frequency Testing for Rapid Generation of High and Very High Cycle Fatigue Data“. Materials 14, Nr. 9 (27.04.2021): 2245. http://dx.doi.org/10.3390/ma14092245.

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Ultrasonic fatigue testing is an increasingly used method to study the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of materials. Specimens are cycled at an ultrasonic frequency, which leads to a drastic reduction of testing times. This work focused on summarising the current understanding, based on literature data and original work, whether and how fatigue properties measured with ultrasonic and conventional equipment are comparable. Aluminium alloys are not strain-rate sensitive. A weaker influence of air humidity at ultrasonic frequencies may lead to prolonged lifetimes in some alloys, and tests in high humidity or distilled water can better approximate environmental conditions at low frequencies. High-strength steels are insensitive to the cycling frequency. Strain rate sensitivity of ferrite causes prolonged lifetimes in those steels that show crack initiation in the ferritic phase. Austenitic stainless steels are less prone to frequency effects. Fatigue properties of titanium alloys and nickel alloys are insensitive to testing frequency. Limited data for magnesium alloys and graphite suggest no frequency influence. Ultrasonic fatigue tests of a glass fibre-reinforced polymer delivered comparable lifetimes to servo-hydraulic tests, suggesting that high-frequency testing is, in principle, applicable to fibre-reinforced polymer composites. The use of equipment with closed-loop control of vibration amplitude and resonance frequency is strongly advised since this guarantees high accuracy and reproducibility of ultrasonic tests. Pulsed loading and appropriate cooling serve to avoid specimen heating.

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Furuya, Yoshiyuki, Kazuo Kobayashi, Masao Hayakawa, Masao Sakamoto, Yutaka Koizumi und Hiroshi Harada. „High-Temperature Ultrasonic Fatigue Testing at 1000°C“. Advanced Materials Research 891-892 (März 2014): 1413–18. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1413.

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A high-temperature ultrasonic fatigue testing system was developed to evaluate the gigacycle fatigue properties of single-crystal superalloys used in aircraft engine turbine blades. In this development, a commercial ultrasonic fatigue testing machine was considerably modified to achieve high-temperature fatigue testing. The developed system took account of temperature dependency of Youngs modulus, and also had a function to evaluate the Youngs modulus. In order to protect the testing system from the heat of a specimen, straight and round rods were inserted between the testing system and the specimen. Other modifications achieved accurate control of temperature, edge displacement and resonance frequency, which were necessary for accurate control of stress amplitude. The testing system was first applied to a heat-resistant steel at 650 °C to check its accuracy, and next to SC superalloy samples at 1000 °C. In the conventional fatigue tests on the heat-resistant steel, the results were coincident in a frequency range from 1 Hz to 800 Hz, suggesting that comparable results would be obtained in ultrasonic fatigue testing at 20 kHz. In case of the SC superalloy samples, conventional fatigue tests were conducted at only 10 Hz, so the frequency effects were not clarified. In both cases, ultrasonic fatigue testing showed good agreement with conventional fatigue testing. The accuracy of the developed system is therefore high, even at 1000 °C. In these results, the SC superalloys showed no fatigue limit, indicating gigacycle fatigue tests to be necessary.

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SAKURAI, Keigo, Yuma MIYAI, Shota HASUNUMA, Takeshi OGAWA, Myunghun WOO und Masahiro TAKANASHI. „Fatigue Crack Growth Threshold of Ni Based Castalloys Using Ultrasonic Fatigue Tests“. Journal of the Society of Materials Science, Japan 66, Nr. 12 (2017): 879–86. http://dx.doi.org/10.2472/jsms.66.879.

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Peng, Wen Jie, Hui Cai Long, Li Yu, Huan Xue, Bao Wen Qiu und Yan Wen Zhang. „An Investigation of Size Effect on Fatigue Property of 3000 MPa-Class Mould Steel Under Ultrasonic Fatigue Testing“. Applied Mechanics and Materials 239-240 (Dezember 2012): 88–91. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.88.

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Ultrasonic fatigue testing was conducted for 3000 MPa-class mould steel to investigate the fatigue behavior. The fatigue specimen is designed particularly due to the ultra-high strength. Ultrasonic fatigue tests are conduced using two types of specimen sizes and the test results are compared to investigate the size effect on the fatigue property.

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Dissertationen zum Thema "Ultrasonic fatigue tests"

Nikitin, Alexander. „Gigacycle Fatigue of the titanium alloy“. Thesis, Paris 10, 2015. http://www.theses.fr/2015PA100015/document.

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Ce projet de doctorat est aux prises avec un problème de ruptures en fatigue de un alliage de titane aéronautique en raison de haute fréquence chargement. Matériel pour cette enquête a été prise de compresseur du moteur disque de l'avion réel. Essais de fatigue à ultrasons ont été réalisées jusqu'à dépasser la limite de 1010 cycles. Cette région de la durée de vie est connu comme Gigacycle ou fatigue très grand nombre de cycles. Ce projet de thèse montre pour la première fois les résultats des tests de fatigue sur l'lliage de titane aéronautique VT3-1 dans la région Gigacycle. Les propriétés de fatigue de l'alliage de titane ont été déterminées à 109 cycles pour les conditions de chargement différentes: traction-compression, tension-tension et de torsion. Mécanismes d'initiation des fissures typiques ont été identifiés et des défauts critiques de microstructure ont été trouvés. L'effet de l'anisotropie en raison de processus de fabrication sur les propriétés de fatigue de l'alliage de titane VT3-1 forgé a été étudiée. Une influence du processus de fabrication sur les propriétés de fatigue a également été étudiée par comparaison les résultats sur extrudé et forgé VT3-1 alliage de titane. La nouvelle machine de torsion à ultrasons a été conçu et installé pour la longue durée de vie (jusqu'à 1010 cycles) de tests de fatigue en rotation. Les premiers résultats sous la chargement en torsion ultrasons ont été obtenues pour l'alliage de titane réalisé par extrusion et technologies forgés
This PhD project is dealing with a problem of fatigue failures of aeronautical titanium alloy due to high frequency loading. The material for investigation was taken from the real aircraft engine compressor disk. Ultrasonic fatigue tests were carried out up to outrun limit of 1010 cycles. This region of lifetime is known as Gigacycle or very high cycle fatigue. This PhD project shows for the first time the results of fatigue tests on the VT3-1 aeronautical titanium alloy in the Gigacycle region. The fatigue properties of the titanium alloy were determined at 109 cycles for different loading conditions: tension-compression, tension-tension and torsion loading. Typical crack initiation mechanisms were identified and critical defects of microstructure were found. The effect of anisotropy due to fabrication process on the fatigue properties of the forged VT3-1 titanium alloy was studied. An influence of technological process on fatigue properties was also studied by comparison the results on extruded and forged VT3-1 titanium alloy.The new ultrasonic torsion machine was designed and installed for the long life (up to 1010 cycles) fatigue tests under rotation. The first results under ultrasonic torsion loading were obtained for the titanium alloy made by extrusion and forged technologies

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Novelli, Marc. „Étude des microstructures de déformation induites par grenaillage ultrasonique en conditions cryogéniques d'aciers inoxydables austénitiques : effet sur les propriétés en fatigue“. Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0239/document.

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La surface des pièces mécaniques est une zone sensible soumise à des conditions de sollicitations particulières, tant mécaniquement (frottement, contrainte maximale) que chimiquement (atmosphère ambiante, corrosion). Ainsi, la ruine des pièces de service est généralement initiée en surface ; les grands secteurs industriels sont donc à la recherche de solutions technologiques permettant une amélioration des propriétés mécaniques globales par une modification des propriétés de surface. De nombreuses techniques ont été développées dans ce but, notamment les traitements de surface mécaniques. Parmi ceux-ci, le grenaillage ultrasonique permet de déformer sévèrement et superficiellement les pièces par de nombreux impacts de billes ayant des trajectoires aléatoires au sein de la chambre de traitement. Le propos de cette étude repose sur l'analyse et la compréhension des microstructures de déformation induites par un traitement de grenaillage ultrasonique, particulièrement sous conditions cryogéniques ; sujet très peu exploré à ce jour voir nouveau concernant i) des métaux susceptibles de subir une transformation martensitique et ii) l'influence d'un tel traitement sur la tenue en fatigue cyclique. Pour ce faire, plusieurs nuances d'aciers inoxydables austénitiques présentant des stabilités différentes vis-à-vis de la transformation de phase ont été traitées à très basses températures et les propriétés obtenues ont été comparées à celles mesurées sur les échantillons traités à température ambiante. Les premières observations ont montré que, suite à un traitement sous condition cryogénique (-130 °C), une baisse de dureté intervient en sous-couche de l'alliage 310S stable, associée à une hausse des propriétés mécaniques sous basse température rendant le matériau plus difficile à écrouir. Ce phénomène est complètement supprimé au sein de l'alliage métastable 304L par une transformation martensitique facilitée, intervenant plus profondément qu'à température ambiante et entrainant une augmentation de la dureté de sous-couche. Deux alliages métastables (304L et 316L) ont donc été sélectionnés afin de détailler l'influence des paramètres de traitement sur le durcissement de sous-couche par une étude paramétrique comprenant l'amplitude de vibration (40 et 60 µm), la durée (3 et 20 min) ainsi que la température de traitement (ambiante, -80 et -130 °C). Il en ressort qu'augmenter l'énergie de traitent par une hausse de l'amplitude et/ou de la durée de grenaillage entraine une augmentation des duretés de surface et de sous-couche, accompagnée par la production de couches durcies plus épaisses. L'utilisation de températures cryogéniques permet une augmentation du potentiel de durcissement, et ce principalement en sous-couche. En associant les gradients de dureté aux distributions de martensite le long des épaisseurs affectées, il a été montré que la fraction de martensite était directement liée au potentielle de durcissement en profondeur. La fraction de martensite produite étant dépendante de la température de déformation et, afin de prendre en compte la stabilité initiale de l'alliage comme paramètre additionnel, des mesures complémentaires ont été faites sur l'alliage 316L plus stable. Les résultats ont alors montré qu'il est primordial d'adapter la température de traitement à la stabilité de l'échantillon afin d'optimiser l'efficacité du durcissement de sous-couche et éviter ainsi une baisse de la dureté en profondeur. Finalement, les structures de déformation obtenues sous condition cryogénique ont été reliées à la tenue mécanique sous sollicitations cycliques en flexion rotative. Comparé à un traitement réalisé à température ambiante, un grenaillage cryogénique permet une baisse la rugosité de surface et la production de contraintes résiduelles de compression plus élevées par la présence de martensite. Cependant, une plus grande relaxation de ces dernières associée à une réduction de l'épaisseur [...]
The surface of mechanical components is a sensitive zone subjected to particular mechanical (friction, maximum stress) and chemical (ambient atmosphere, corrosion) interactions. Hence, the rupture is generally initiated on the surface. In order to increase the global integrity of the working parts, the industrial groups are still seeking technological solutions allowing the modifications of the surface properties. Nodaway, plenty of surface modification techniques have been developed like the mechanical surface treatments. Among them, the ultrasonic shot peening (or surface mechanical attrition treatment) focus on superficially deform the mechanical parts through numerous collisions of peening medias having random trajectories inside a confined chamber. The purpose of this study is based on the analysis and the comprehension of the deformed microstructures induced by the ultrasonic shot peening treatment, especially under cryogenic temperatures. To do so, several austenitic stainless steel grades having different stabilities regarding the martensitic transformation have been treated under cryogenic conditions and compared to the properties obtained under room temperature. The first observations have shown that, after a cryogenic peening, a decrease of the subsurface hardness takes place in the stable 310S alloy which was attributed to an increase of the mechanical properties under cryogenic temperature. This phenomenon is suppressed in the metastable 304L by triggering a martensitic phase transformation promoted under low temperature and happening deeper compared to room temperature, increasing substantially the subsurface hardness. Two metastable alloys (304L and 316L) were then selected to conduct an ultrasonic shot peening parametric study including the vibration amplitude (40 and 60 µm), the treatment duration (3 and 20 min) and temperature (room temperature, -80 and -130 °C). It has been shown that increasing the treatment energy by raising the vibration amplitude and/or the duration leads to an increase of the surface and subsurface hardnesses as well as the affected layer thickness. The use of cryogenic temperatures allows an additional increase of the hardness, especially in subsurface. By comparing the different hardness gradients with the martensite distributions along the hardened layers, a direct correlation with the hardening rate and the martensite fraction was observed. The initial stability of the treated material was also taken in account by carried out additional observations on the 316L having a higher stability. The results have indicated that the deformation temperature needs to be wisely chosen regarding the stability of the processed material in order to avoid a decrease of the subsurface hardness. Finally, the deformed microstructures generated under cryogenic ultrasonic shot peening were associated to the mechanical behaviors of cylindrical specimens using rotating bending fatigue tests. Compared to a room temperature treatment, a cryogenic peening allows a decrease of the surface roughness and the generation of higher surface compressive residual stresses by the formation of martensite. However, compared to a room temperature treatment, the fatigue behavior was not increased after a cryogenic peening because of a more pronounced surface residual stress relaxation and a reduction of the affected layer. However, the potential increase of the fatigue life after a cryogenic surface deformation was depicted by the study of the rupture surfaces. It was observed that, if the involvement of the surface defects introduced by the high surface roughness can be lowered, a single subsurface crack initiation can be produced increasing considerably the fatigue behavior of the processed material

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Kozáková, Kamila. „Vliv vrubů při cyklickém vysokofrekvenčním únavovém zatěžování“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443717.

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The diploma thesis deals with the evaluation of the lifetimes of smooth and notched specimens. The comparison of their lifetimes is focused on the case of high-frequency cyclic loading in the area of high-cycle and gigacycle fatigue of materials. The theory of critical distances is used to evaluate and recalculate the life curves of the notched specimens. The effect of the notch is quantified using the Line method. The critical length parameter is determined so that the life curve of the notched specimens corresponds to the curve measured on smooth specimens. The result is the dependence of the critical length parameter on the number of cycles to fracture. Knowledge of critical length parameters can be used to determine the lifetime of notched specimens as well as real notched components using the results of fatigue tests of smooth specimens.

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Lúcio, João Gilberto. „Estudo do processo de dobramento a frio de grampo para feixe de mola“. Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-29072014-141801/.

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O aço SAE 1552 modificado é um desenvolvimento recente da família do aço carbono manganês ligado ao silício, sendo utilizado para confecção de grampo U que tem como finalidade prender o feixe de molas no eixo do veículo. A somatória das fases de produção dessa matéria prima introduz os limites de resistência mecânica final necessária para atender a classe de resistência normativa. A peça produzida com esse aço tem alcançado crescimento de utilização na indústria automotiva devido à mesma apresentar propriedades mecânicas que atendem a requisitos normativos de classe de resistência e com vantagem de evitar tratamento térmico na fase de confecção do grampo e sendo esse processo realizado a frio em todas as suas fases. O objetivo desse trabalho foi estudar falha de grampo na etapa do processo de dobramento em forma de U e aplicar ensaios como: programa de simulação de tratamento térmico Stecal 3.0, ultrassom, fadiga, teste de cela e análise de fratura para solucionar essas falhas. Também foi realizado ensaios para prever fraturas catastróficas como: elementos finitos através de programa de computador Abaqus, ensaio de extensometria, tenacidade a fratura e medições de tensões residuais através de técnica de difração de raios-x. Foi concluído através dos resultados dos estudos de microestrutura resultante de tratamento térmico da matéria prima que o processo com resfriamento controlado em esteira é mais adequado para a produção do aço para confecção de grampo. O ensaio de ultrassom antes e após ensaio de fadiga possibilitou dimensionar o crescimento da profundidade da trinca em cotovelo de grampo e através de elementos finitos e extensometria associado com mecânica da fratura foi possível conhecer as tensões em ponto de estudo e entender o motivo de não ocorrer falha catastrófica. O ensaio de difração de raios-x permitiu o entendimento das tensões residuais introduzidas na peça de estudo.
SAE 1552 steel modified is a recent development of manganese carbon steel group linked to silicon, which is used to manufacture u-bolt that aims to fix leaf spring at vehicle axle in the back part. The sum of production stages of this raw material introduces the final mechanical resistance limits to meet class rules resistance. The piece produced with this steel has achieved growth of use in the automotive industry due to the mechanical properties it presents, which meet regulatory requirements for strength class and the advantage of avoiding heat treatment during manufacturing of the u-bolt and all the phases of this process are carried out in cold. This work aims to study the u-bolt failure during the folding process in the form of U and apply tests such as heat treatment simulation -Stecal 3.0, ultrasonic test, fatigue test, cell testing and analysis of crack. Other tests have been carried out to predict catastrophic fractures such as: finite element through computer program called Abaqus, extensometry testing, toughness testing for fracture and residual stress measurement by X ray diffraction technique. Results of heat treatment studies, by microstructure analysis, allowed choosing appropriate process for steel production. Ultrasonic testing before and after fatigue testing enabled to measure growth of crack depth on u-bolt elbow, and through finite element and extensometry testing associated with Mechanical of Fracture it was possible to know the stress concentrated at a point and to understand why catastrophic failure did not occur. Residual stress understanding has provided overall vision of u-bolt studied and contributed to have precision in measurement at inner and outer part of the u-bolt elbow.

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Bücher zum Thema "Ultrasonic fatigue tests"

Real time acousto-ultrasonic NDE technique for monitoring damage in ceramic composites under dynamic loads. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Real time acousto-ultrasonic NDE technique for monitoring damage in ceramic composites under dynamic loads. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., Hrsg. Real time acousto-ultrasonic NDE technique for monitoring damage in ceramic composites under dynamic loads. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Buchteile zum Thema "Ultrasonic fatigue tests"

Aoyama, Yosuke, Ichiro Takasu und Yasukazu Unigame. „Improvement in Efficiency of Ultrasonic Tests for the Macroscopic Inclusions Evaluation“. In Bearing Steel Technologies: 9th Volume, Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies, 257–67. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104504.

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Kim, Bum Joon, Byeong Soo Lim, Sung Jin Song und Young H. Kim. „Application of Ultrasonic Test on Creep-Fatigue Life Evaluation“. In Advanced Nondestructive Evaluation I, 476–79. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-412-x.476.

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Torabian, Noushin, Véronique Favier, Saeed Ziaei-Rad, Justin Dirrenberger, Frédéric Adamski und Nicolas Ranc. „Calorimetric Studies and Self-Heating Measurements for a Dual-Phase Steel Under Ultrasonic Fatigue Loading“. In Fatigue and Fracture Test Planning, Test Data Acquisitions and Analysis, 81–93. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2017. http://dx.doi.org/10.1520/stp159820160053.

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He, Bolin, Yongxiang Wang, Yingxia Yu, Yuxin Zhang und Kang Wei. „Theoretical Analysis and Experimental Verification of the Influence of Geometrical Parameters on the Fatigue Life of SMA490BW Welded Butt Joint“. In Advances in Transdisciplinary Engineering. IOS Press, 2020. http://dx.doi.org/10.3233/atde200249.

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Finite element mode was carried out for ultra-high cycle fatigue specimens of SMA490BW steel butt joints used in bogies. Finite element software ABAQUS/ FE-Safe was used to calculate the influences of different arc transition radius r and weld toe angles θ on joint stress concentration factor Kt and joint fatigue life N. The results show that r and θ have significant influence on the Kt and fatigue life of the SMA490BW steel butt joint for bogie. For the same inclination angle θ, Kt decreases gradually with r increasing. With θ increases, the effect of r on Kt is increasing continuously, also the effect of change in Kt caused by r on fatigue life N is increasing continuously. While in the case of same weld edge r, Kt increases with θ increasing. With r increases, the effect of θ on Kt is decreasing constantly, the effect of change in Kt caused by θ on fatigue life N is decreasing constantly. The fatigue performance of SMA490BW steel butt joint was tested by ultrasonic fatigue test machine. The results between the fatigue test and calculation is less than 15%. The finite element calculation result has important significance for improving the fatigue life of welded butt joint for bogie.

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Fuchs, P. A., U. Halabe, S. Petro, P. Klinkhachorn, H. Gangarao, A. V. Clark, M. G. Lozev und S. B. Chase. „Field Test Results of an Ultrasonic Applied Stress Measurement System for Fatigue Load Monitoring“. In Structural Materials Technology, 68–73. CRC Press, 2020. http://dx.doi.org/10.1201/9781003075844-12.

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Shirahata, H. „Applicability of 2D ultrasonic phased array nondestructive test for fatigue crack of orthotropic steel deck“. In Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 1028–35. CRC Press, 2021. http://dx.doi.org/10.1201/9780429279119-139.

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Kozakowski, Stanisław. „Measurements of the Changes in the Ultrasonic Wave Attenuation in Spheroidal Graphite Iron Test Pieces Subjected to Fatigue Load“. In Non-Destructive Testing, 2212–17. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036221-2.50006-1.

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Shirahata, H. „Development of phased array ultrasonic test system for detection of fatigue crack of rib-to-deck weld of orthotropic steel deck system“. In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 2857–64. CRC Press, 2018. http://dx.doi.org/10.1201/9781315189390-388.

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Konferenzberichte zum Thema "Ultrasonic fatigue tests"

Daniel, Tobias, Annika Boemke, Marek Smaga und Tilmann Beck. „Investigations of Very High Cycle Fatigue Behavior of Metastable Austenitic Steels Using Servohydraulic and Ultrasonic Testing Systems“. In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84639.

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To investigate the fatigue behavior of metastable austenite steels in the VHCF-regime, high loading frequencies are essential to realize acceptable testing times. Hence, two high-frequency testing systems were used at the authors’ institute: an ultrasonic testing system with a test frequency of 20 000 Hz and also, a servohydraulic system with a test frequency of 980 Hz. In the present study, two different batches of the metastable austenitic stainless steel AISI 347 were investigated. Fatigue tests on metastable austenitic steel AISI 347 batch A were carried out at an ultrasonic test system at a test frequency of 20 000 Hz, at ambient temperature. Because the test rig acts as a mechanical resonant circuit excited by a piezoelectric transducer the specimen must be designed for oscillation in its vibration Eigenmode at the test frequency to assure maximum displacement at the end and maximum stress in the gauge length center, respectively. For analyzing the deformation behavior during the tests, the change in temperature was measured. Additionally, Feritscope™ measurements at the specimen surface were performed ex-situ after defined load cycles. First results showed a pronounced development of phase transformation from paramagnetic face-centered cubic γ-austenite to ferromagnetic body-centered cubic α‘-martensite. Because formation of α‘-martensite influences the transient behavior and high frequency loadings leads to pronounced self-heating of the material, ultrasonic fatigue tests on metastable austenites represent a challenge in controlling of displacement amplitude and limiting the specimen temperature. First investigations on metastable austenitc steel AISI 347 batch B using a servohydraulic test system at a frequency of 980 Hz and a temperature of T = 300 °C resulted in no fatigue failure beyond N = 107 cycles in the VHCF-regime. However, only specimens with a low content of cyclic deformation-induced α‘-martensite achieved the ultimate number of cycles (Nu = 5·108).

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Zhao, Nanzhu, Wei Li, Wayne W. Cai und Jeffrey A. Abell. „A Method to Study Fatigue Life of Ultrasonically Welded Lithium-Ion Battery Tab Joints Using Electrical Resistance“. In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4159.

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The fatigue life of ultrasonically welded lithium-ion battery tab joints is studied for electric and hybrid-electric vehicle applications. Similar to metallic materials, the electrical resistance of these ultrasonic welds strongly depends on their quality and the crack growth under fatigue loading. A fatigue life model is developed using the continuum damage mechanics formulation, where the damage variable is defined using the electrical resistance of ultrasonic welds. Fatigue tests under various loading conditions are conducted with aluminum-copper battery tab joints made under various ultrasonic welding conditions. It is shown that the electrical resistance of ultrasonic welds increases characteristically during the fatigue life test. There is a threshold for the damage variable, after which the ultrasound welds fail rapidly. Due to welding process variation, welds made under the same process settings may have different fatigue performance. This quality difference may be classified using two parameters estimated from the fatigue life model. By monitoring the electrical resistance, it is possible to predict the remaining life of ultrasonically welded battery tab joints using only a portion of the fatigue test data. The prediction is more reliable by incorporating data beyond the half-life of the joints during the fatigue test.

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Shen, Yanfeng, Nipon Roy, Junzhen Wang, Zixuan Liu, Danyu Rao und Wu Xu. „Amplitude and Sweeping Direction Dependent Nonlinear Ultrasonic Resonance Spectroscopy for Fatigue Crack Detection“. In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86221.

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This paper investigates the amplitude and sweeping direction dependent behavior of nonlinear ultrasonic resonance spectroscopy for fatigue crack detection. The Contact Acoustic Nonlinearity (CAN) and the nonlinear resonance phenomena are illuminated via a reduced-order bilinear oscillator model. Unlike conventional linear ultrasonic spectroscopy, which would not change its pattern under different amplitudes of excitation or the frequency sweeping direction, the nonlinear resonance spectroscopy, on the other hand, may be noticeably influenced by both the wave amplitude and the loading history. Both up-tuning and down-tuning sweeping active sensing tests with various levels of excitation amplitudes are performed on a fatigued specimen. Short time Fourier transform is adopted to obtain the time-frequency features of the sensing signal. Corresponding to each excitation frequency, a nonlinear resonance index can be established based on the amplitude ratio between the superhamronic, the subharmonic, the mixed-frequency response components and the fundament frequency. The measured nonlinear resonance spectroscopy for a certain amplitude and frequency sweeping direction can be readily used to establish an instantaneous baseline. The spectroscopy of a different amplitude or frequency sweeping direction can be compared with such an instantaneous baseline and a Damage Index (DI) is obtained by measuring the deviation between the two spectra. Experimental investigations using an aluminum plate with rivet hole nucleated fatigue cracks are performed. A series of nonlinear spectroscopies are analyzed for both the pristine case and the damaged case. The spectral features for both cases are obtained to demonstrate the proposed fatigue crack detection methodology which may find its application for structural health monitoring (SHM). The paper finishes with summary, concluding remarks, and suggestions for future work.

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Zhang, Ming, Weiqiang Wang und Aiju Li. „The Effects of Specimen Size on the Very High Cycle Fatigue Properties of FV520B-I“. In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45934.

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The authors researched the effects of specimen size on the very high cycle fatigue properties of FV520B-I through ultrasonic fatigue testing. The test results showed that the very high cycle fatigue mechanism was not changed and the fatigue properties declined as the specimen size increased. The S-N curve moved downward and the fatigue life decreased under the same stress level maybe due to the heat effects of large specimens in tests. The fatigue strength and the fatigue life were predicted by relevant models. The prediction of fatigue strength was close to test result, and the prediction of fatigue life was less effective compared with the previous prediction of small size specimen test results.

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Wang, Hui, Yingbin Hu, Fuda Ning, Yuzhou Li, Meng Zhang, Weilong Cong und Samantha Smallwood. „Surface Grinding of CFRP Composites Using Rotary Ultrasonic Machining: Effects of Ultrasonic Power“. In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2726.

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Carbon fiber reinforced plastic (CFRP) composites have superior properties, including high strength-to-weight ratio, high modulus-to-weight ratio, high fatigue resistance, etc. These properties make CFRP composites being popular in many kinds of industries. Due to the inhomogeneous and anisotropic properties, and high abrasiveness of the reinforcement in CFRP composites, they are classified as difficult-to-cut materials in surface grinding processes. Many problems (including high cutting force and low machining efficiency) are generated in conventional surface grinding processes. In order to reduce and eliminate these problems, rotary ultrasonic machining (RUM) surface grinding of CFRP composites is conducted in this investigation. Effects of ultrasonic power in different machining levels are of great importance in RUM surface grinding processes. However, no investigations on effects of ultrasonic power in different machining levels are conducted in such a process. This investigation, for the first time, tests the effects of ultrasonic power on output variables, including cutting force, torque, and surface roughness in different machining levels. This paper will provide guides for future research on effects of ultrasonic power in different combinations of machining variables on output variables.

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Salzman, Ronald, David Gandy, Neville Rieger, Bernd Schönbauer, Stefanie Tschegg, Shengqi Zhou und Alan Turnbull. „Corrosion-Fatigue Prediction Methodology for 12% Cr Steam Turbine Blades“. In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98026.

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The useful life of a steam turbine and the establishment of turbine outage schedules are often determined by corrosion fatigue to the low pressure (LP) blades in the phase transition zone (PTZ). Developing an effective corrosion damage prediction methodology is an important step to successfully reduce the number of unscheduled steam turbine outages. Tests with dual certified 403/410 12% Cr martensitic steel were performed to quantify the influence of corrosion pits on the fatigue life during testing in environments that are comparable to operational conditions. Threshold stress intensity factors ΔKth and fatigue limits Δσ0 were determined in air and two aqueous solutions. Additionally, stress-life tests were performed with pre-pitted specimens in air and aqueous solutions. The data for transition from a pit-to-a-crack have been correlated using the Kitagawa Diagram. This presentation of the data relates the steady stress, cyclic stress and pit width to the prediction of fatigue failure. Ultrasonic fatigue testing was an essential aspect of this program. This testing technique makes it possible to accumulate cycles at a rate of approximately 20 kHz. At this rate one billion (109) cycles are accumulated in less than 14 hours. One billion cycles has been used as the definition for non-progressive crack or specimen run-out life. All of the data for the survival and failure stress intensity factor was well represented by the El Haddad refinement to the Kitagawa Diagram. Based on these test results a comprehensive methodology has been developed to quantify the risk of corrosion-fatigue failure at a pit.

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Togasaki, Yu, Takashi Honda, Tetsuya Sasaki, Atsushi Yamaguchi und Hirokazu Tsuji. „Effect of Ultrasonic Impact Treatment on Fatigue Life in Butt Welded Joints of Austenitic Stainless Steel“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25539.

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Ultrasonic impact treatment (UIT), which is a type of peening method, is usually used as a post-weld treatment for mild steel in order to improve the fatigue strength of its welded joints. As there is insufficient fatigue data available on welded joints of austenitic stainless steel treated by UIT, the authors decide to conduct fatigue tests on butt welded joints of austenitic stainless steel treated by UIT. The results were compared with the fatigue lives of as-weld joints to investigate the effect of UIT on the fatigue lives of welded joints of austenitic stainless steel. The fatigue lives of butt welded joints treated by UIT were more than 1.5 times longer than those of as-weld joints. The following were considered as possible reasons for this improvement in fatigue life: change in residual stress near the weld toes, relaxation of stress concentration at the weld toes, and refinement of grains under the weld toes. The residual stress measured near the weld toes by using the X-ray diffraction method was transformed from tension to compression by the application of UIT. The stress concentration factors at the welded toes were reduced about 10% by the application of UIT.

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Willems, Herbert, Hans Petter Bjørgen, Thor-Ståle Kristiansen und Guus Wieme. „Qualification of a Combined Ultrasonic Inspection Tool for Detection and Sizing of Circumferential Weld Cracks in Offshore Pipelines“. In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33537.

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The target of inline crack inspection is normally related to the detection of axial cracks (weld cracks, SCC etc.) as axial cracks are usually expected under typical loading conditions in pressurized pipe. Ultrasonic crack inspection tools for this type of cracks have been available for over 20 years and have become a standard application in the ILI business. However, under certain conditions circumferential cracking may occur and the inspection technique needs to be modified accordingly. Especially under offshore conditions with limited pipeline accessibility not only the early detection of crack-like defects is required but also a precise depth sizing is important in order to minimize the risk of crack-related pipeline failure. In order to ensure a high probability of detection together with state-of-the-art depth sizing, a 10″ inline inspection tool was developed for the detection of circumferentially orientated weld cracks. The tool combines the advantages of the pulse-echo technique on the detection side with the excellent capabilities of the TOFD (time-of-flight-diffraction) technique for accurate sizing. Both techniques are implemented into a tethered tool where the pulse-echo unit serves for fast screening while the relatively slow TOFD-unit is used for sizing of any detected crack-like features. In order to qualify the new tool for a special offshore application (inspection of circumferential cracking at welded anode pads) extensive testing was performed using a 10″ test pipeline prepared by Statoil. The test line contained 64 artificial weld defects for reference purposes as well as an unknown number of fatigue cracks in the weld area which were generated by fatigue testing of the corresponding pipes. The tests were full blind tests with no advance knowledge on locations and sizes of the cracks. The sizes of the fatigue cracks (length, depth) were determined by destructive examinations carried out after inline testing. The subsequent comparison of the destructive results with the non-destructive results showed that the specification of the tool with regard to detection and sizing was fully met. In the paper, the inspection concept and the setup of the new tool are described, and the results of the qualification tests are presented.

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Pargeter, Richard, David Baxter und Briony Holmes. „Corrosion Fatigue of Steel Catenary Risers in Sweet Production“. In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57075.

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Steel catenary risers (SCRs) are commonly used for deepwater oil and gas developments and the most economic material of construction is generally carbon manganese (C-Mn) steel. These risers suffer cyclic loading principally due to vessel movements, and vortex induced vibration (VIV) from passage of marine currents. For this reason, close attention is paid to fatigue design and girth weld quality, and fatigue testing is commonly carried out on procedure test welds. A further advantage of C-Mn steel is that good quality welds can readily be made, and more importantly, freedom from defects can be assured by reliable ultrasonic inspection. In sweet corrosive environments, when significant hydrogen effects would not be anticipated, a range of environmental effects on fatigue could be envisaged under different conditions, and at different stages of fatigue crack growth. For example, in early stages of growth, corrosion could blunt crack tips, and therefore slow the growth rate, whereas under other circumstances, or later in life, corrosion could provide additional crack extension, and accelerate growth. It has been demonstrated in this programme of fatigue crack growth rate and endurance testing that the most aggressive conditions in terms of corrosivity may not give shortest fatigue lives in testing. The results of tests comparing behaviour in air and in a very highly corrosive aqueous environment at 60°C saturated with CO2 (conditions which could not be sustained in production) have been explained by reference to competing effects of fatigue and corrosion. Comparison has been made with other published data. Important safety implications surrounding conditions for project-specific corrosion fatigue testing for riser design are considered.

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Ogawa, Takeshi, Motoki Nakane, Kiyotaka Masaki, Shota Hashimoto, Yasuo Ochi und Kyoichi Asano. „Investigation of Effect of Pre-Strain on Very High-Cycle Fatigue Strength of Austenitic Stainless Steels“. In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48811.

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The austenitic stainless steels have excellent mechanical and chemical characteristics and these materials are widely used for the main structural components in the nuclear power plants. A part of structural components using these materials is considered to have strain-history by machining, welding and etc in the process of manufacturing and these parts would be hardened because these materials have a remarkable work-hardening property. On the other hand, conventional studies for the fatigue strength used to be investigated by the results of fatigue tests applying normal specimens without the effect of hardening by pre-strain. This paper describes the effect of large pre-strain on very high cycle fatigue strength of the materials in consideration for the evaluation of strength of actual structures in the nuclear power plants. In order to achieve this purpose, the fatigue tests were carried out with strain hardened specimens. The material served in this study was type SUS316NG. Up to ±20% pre-strain was introduced to the round bar shaped materials by tension and compression load test, and the materials were mechanically machined to the hourglass shaped smooth specimens. On the other hand, the pre-strain of some specimens were introduced after machining so as to study the influence of roughness of the surface of the specimens for the fatigue property. Fatigue tests were conducted by ultrasonic and rotating-bending fatigue test machines and conditions were decided by preliminary examinations to control temperature elevation of the specimen during the fatigue test. The S-N curves obtained from fatigue tests show that increase in magnitude of the pre-strain cause increase in the fatigue strength of the material and this relationship is independent of type of the pre-strains of tension and compression. Though all specimens were fractured by the surface initiated fatigue crack, only one specimen was fractured by the internal crack and so-called “fish-eye” was observed on the fracture surface. However, the internal fracture of the SUS316NG does not cause sudden drop of the fatigue strength. Also, the Vickers hardness tests were carried out to discuss the relationship between fatigue strength and hardness of the pre-strained materials. It is found that the increase in fatigue limit of the pre-strained materials strongly depend on the hardness derived from the indentation size equals to the scale of stage I fatigue crack.

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