Relevant bibliographies by topics / Ultrasonic fatigue test

Academic literature on the topic 'Ultrasonic fatigue test'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Ultrasonic fatigue test"

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Wu, Jin Rong. "Fatigue Test of Asphalt Mixture and Ultrasonic Forecast." Advanced Materials Research 168-170 (December 2010): 488–91. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.488.

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The fatigue behavior of the asphalt mixtures beams is experimented by sine wave load, and the fatigue life is predicted by ultrasonic ware theories. Test results show that ultrasonic ware can reflect better fatigue process, and it is an effective method to analyze and forecast fatigue property.
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Feng, Ning, Xin Wang, Jiazheng Guo, Qun Li, Jiangtao Yu, and Xuecheng Zhang. "Design Theory and Experimental Research of Ultrasonic Fatigue Test." Machines 10, no. 8 (July 30, 2022): 635. http://dx.doi.org/10.3390/machines10080635.

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Ultrasonic fatigue testing is a key technology that is more efficient and energy saving compared to conventional fatigue testing. In order to investigate the behavior of metallic materials at ultra-high frequencies and to verify the validity of ultrasonic fatigue test results, this paper builds a test apparatus that can be used to conduct ultrasonic fatigue tests, and this paper proposes a complete procedure from theoretical analysis to the investigation of test laws for 20 kHz tensile and the compression test. Firstly, the initial sizes of the sample are calculated with an analytical method, then the three-dimensional model is simulated and optimized with finite element software, and the optimum result for the sample size is then obtained according to the sensitivity of the sample size to the effect of frequency. The next step is to analyze the influenced trend of the sample size, including L1, L2, L3, R1 and R2, on the resonant frequency and maximum stress of the sample. According to the optimized results, the sample was processed, and an ultrasonic fatigue test was carried out to ensure the sample fatigue fracture finally occurred. Finally, the S-N curve of the material was plotted based on the data recorded in the test and compared with the conventional fatigue life curve to verify the feasibility of the ultrasonic fatigue test device and test method. The fracture of the sample was observed using an optical microscope, and its macroscopic fracture morphology was analyzed. The fracture morphology of the sample can be divided into three typical zones: the fatigue crack source zone, the extension zone and the transient zone, where the fatigue cracks all originate from on the surface of the sample. The results demonstrate the validity of the ultrasonic fatigue test results and provide new ideas for the design and optimization of ultrasonic fatigue samples and shorter processing times, providing a reference for subsequent ultrasonic fatigue tests on typical materials.
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Matsuura, Tohru. "Giga-cycle fatigue test by ultrasonic fatigue testing machine." Journal of Japan Institute of Light Metals 68, no. 6 (June 30, 2018): 316–20. http://dx.doi.org/10.2464/jilm.68.316.

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Kim, Jae Woo, Da Hee Cho, Gwang Ju Jang, Joong Cheul Park, Yeong Cheol Lee, Byeong Choon Goo, and In Sik Cho. "Guidelines for Standardization of Ultrasonic Fatigue Test." Transactions of the KSME C Industrial Technology and Innovation 6, no. 2 (September 30, 2018): 85–94. http://dx.doi.org/10.3795/ksme-c.2018.6.2.085.

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Dong, Hong Lei, Zhong Guo Huang, Qing Hua Yuan, and Jia Fan. "Research on Fatigue Test of LZ20Mn2 Axle Pipe Steel." Applied Mechanics and Materials 44-47 (December 2010): 2152–56. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2152.

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The core of ultrasonic accelerate fatigue test is resonance, and specimens need resonating with the system. The ultrasonic fatigue test method was used to investigate the high cycle fatigue properties of LZ20Mn2 axle pipe steel. Tests were conducted on cylindrical dog-bone specimens, and all fatigue loadings were controlled by inputting vibration amplitude. The results showed that the S-N curve of LZ20Mn2 axle pipe steel presented a slow-decline shape and subsurface crack initiation. The fatigue fracture was observed by SEM. Two different crack initiation mechanisms were observed which were the mixed inclusions and dislocation. Crack closure effect played an important role at fatigue crack propagation area and the fracture mechanism was a typical plastic fracture.
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Kim, Bum Joon, Byeong Soo Lim, Sung Jin Song, and Young H. Kim. "Application of Ultrasonic Test on Creep-Fatigue Life Evaluation." Key Engineering Materials 321-323 (October 2006): 476–79. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.476.

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This work investigates the relationship between the creep-fatigue life and ultrasonic test of creep-fatigue damage. Under the creep-fatigue interaction, the main cause of life reduction is the initiation and growth of microvoid with increasing hold time. The number/size of microvoid/cavity, the fraction of cavity area varied with the hold time. Therefore, the life evaluation using the microvoid with the variation of hold time is very informative for safety of components in power plants. In this study, using the heat resisting alloy, P122 steel for USC (ultra super critical) power plant, the creep-fatigue tests with various hold times and their ultrasonic inspection were carried out for the purpose of evaluation for creep-fatigue life. The results obtained by Rayleigh surface wave of backscattered ultrasound were compared and analyzed with the experimental parameters. The good agreement between the experimental life and the predicted life was obtained.
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CHEN, Q., N. KAWAGOISHI, K. KARIYA, Y. NU, and M. GOTO. "FATIGUE CRACK GROWTH OF AGE-HARDENED Al ALLOY UNDER ULTRASONIC LOADING." International Journal of Modern Physics: Conference Series 06 (January 2012): 275–81. http://dx.doi.org/10.1142/s2010194512003303.

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An age-hardened and extruded Al alloy 7075-T6 was fatigued under both ultrasonic loading (20kHz) and rotating bending (50Hz) in the environments of controlled humidity, distilled water and oxygen gas respectively, to investigate the availability of ultrasonic fatigue test as a time-saving tool for the reliability evaluation of materials subjected to conventional frequency loading. Although fatigue strength decreased slightly at relative humidity below 60-70%, it degraded significantly when the humidity was increased beyond that level, irrespective of the loading frequency. However, the mechanisms of strength degradation involved in high humidity are quite different. Under rotating bending, fatigue strength decreased because crack growth was accelerated due to brittle fracture, whileas the decrease in fatigue strength under ultrasonic loading was caused by crack propagation transition from tensile mode to shear mode cracking.
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Myeong, No-Jun, Seung-Wook Han, Jung-Hoon Park, and Nak-Sam Choi. "Technical Review of Specimens under Ultrasonic Fatigue Test." Transactions of the Korean Society of Mechanical Engineers A 37, no. 8 (August 1, 2013): 967–73. http://dx.doi.org/10.3795/ksme-a.2013.37.8.967.

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YAMADA, Takeshi, Hitoshi ISHII, Hiroyasu ARAKI, and Keiichiro TOHGO. "424 Ultrasonic Bending Fatigue Test of Thin Sheets." Proceedings of Conference of Tokai Branch 2005.54 (2005): 129–30. http://dx.doi.org/10.1299/jsmetokai.2005.54.129.

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Chen, Hanxin, Mingming Liu, Yongting Chen, Shaoyi Li, and Yuzhuo Miao. "Nonlinear Lamb Wave for Structural Incipient Defect Detection with Sequential Probabilistic Ratio Test." Security and Communication Networks 2022 (March 9, 2022): 1–12. http://dx.doi.org/10.1155/2022/9851533.

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The incipient defect is difficult to be identified by ultrasonic signal analysis. The nonlinear ultrasonic method based on the nonlinear Lamb wave principle is proposed by establishing a nonlinear Lamb wave ultrasonic inspection platform. The optimal Lamb wave parameters are obtained for the incipient fatigue material defects. The aluminum alloy board with 3 mm thickness under the different fatigue tensile cycles is tested. The nonlinear ultrasonic signals are analyzed to obtain second harmonic signals. The intelligent diagnosis method for incipient material degrade is proposed based on the Sequential Probability Ratio Test (SPRT). The sequential probabilistic ratio test (SPRT) algorithm is carried out to classify and identify the second harmonics of four different fatigue damages. The results show that the method about with nonlinear Lamb wave analysis with SPRT is effective and reliable for the incipient material microdefect degradation.
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Dissertations / Theses on the topic "Ultrasonic fatigue test"

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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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Books on the topic "Ultrasonic fatigue test"

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United States. National Aeronautics and Space Administration., ed. 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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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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Book chapters on the topic "Ultrasonic fatigue test"

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Kim, Bum Joon, Byeong Soo Lim, Sung Jin Song, and 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, and 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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Aoyama, Yosuke, Ichiro Takasu, and 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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He, Bolin, Yongxiang Wang, Yingxia Yu, Yuxin Zhang, and 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, and 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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Conference papers on the topic "Ultrasonic fatigue test"

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Celli, Dino A., Justin Warner, Onome Scott-Emuakpor, and Tommy George. "Investigation of Self-Heating During Ultrasonic Fatigue Testing and Effect on Very High Cycle Fatigue Behavior of Titanium 6Al-4V." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83443.

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Abstract Very high cycle fatigue (VHCF) data and experiments, 107−109 cycles to failure, has traditionally been both a cumbersome and costly task to perform. However, characterizing VHCF behavior of material systems are critical for the design and sustainability of turbine engines as outlined in the turbine engine structural integrity program (ENSIP). With recent advancements, ultrasonic fatigue test systems have become increasingly available to generate VHCF fatigue data. A primary consideration for ultrasonic fatigue testing is the frequency of loading, the resulting thermal evolution, and its effect on fatigue life. To mitigate the heat generation within the specimen during experiments, cooling air is directed to the specimen and cyclic loading is performed by selecting an appropriate test frequency or defining a duty cycle rather than continuously subjected to fatigue. However, standardization of experimental test procedures remains ongoing and continues to be developed. In this study a Shimadzu USF-1000A ultrasonic fatigue test system is used to characterized VHCF behavior of Ti 6Al-4V to understand the effect of duty cycle and thermal evolution on fatigue life for ultrasonic fatigue testing. Titanium 6Al-4V test specimens are subjected to fully reversed axial fatigue at 20kHz exciting resonance in an axial mode to better characterize the experimental process. Three duty cycle configurations are investigated and its effect on fatigue life due to self-generated heat during the experiment. Heat generation is monitored in-situ via a single-point optical pyrometer and in-situ mechanical and thermal data is collected and compared to standardized servo-hydraulic fatigue test data performed in this study as well as from data found in the literature.
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Zhao, Nanzhu, Wei Li, Wayne W. Cai, and 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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Lopez Martinez, Luis. "Fatigue Life Extension of Offshore Structures by Ultrasonic Peening." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49935.

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The service life of offshore installations is limited by its structural integrity. Furthermore the structural integrity is mainly governed by the fatigue resistance of critical welded details. In a FPSO installation these details are among others pallet stools weld joints to deck structure and bulkheads/web frames weld connections to longitudinal in ballast tanks. ultrasonic peening can improve the fatigue resistance of welded joints. Fatigue test results shows an increase of four times for high stress ranges and up to ten times for high cycle fatigue. For specimens which have already consumed half of their fatigue life the treatment resets the clock to zero, as a minimum value. Consequently ultrasonic peening treatment was applied to several offshore installations on fatigue sensitive weld connections with the objective to extend the service life of the these. Finite Element Analysis carried out by classification societies for these offshore structures demonstrated critical fatigue lives for several weld connections. These weld connections were then treated by ultrasonic peening with the objective to extend their fatigue lives and by doing that reach the targeted service life for the installation. The successful application of the ultrasonic peening treatment was a pioneering work which involved several partners. A pilot project on a FPSO started in 2005 and the treated critical weld connections are still intact and show not sign of crack initiation despite the fact the calculations then showed shorter fatigue lives than the life span already consumed. As a result the same ultrasonic peening procedure has been proposed to be applied for other fatigue sensitive locations on the installation. Offshore installations around the world are reaching their original design life. Most of the operators chose to extend the service life of their assets rather than scrape them and build new. The reasons for that are: improved oil recovering techniques, time required to get a new build installation on site, environment concerns, wiser management of energy and resources among others. Therefore the Life Extension of Offshore Installations is a subject of current interest for the upstream industry.
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Daniel, Tobias, Annika Boemke, Marek Smaga, and 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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Martinez, Luis Lopez, Zuheir Barsoum, and Anna Paradowska. "State-of-the-Art: Fatigue Life Extension of Offshore Installations." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83044.

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The use of fatigue life improvement techniques and specifically ultrasonic peening treatment to extend the service life of offshore structures has become an accepted practice during the last five years. The understanding of the process as well as equipment’s upgrading for treatment in-situ including quality control and assurance have been developed up to a level that it has become a current practice in many parts of the world. However, the efficiency of the ultrasonic peening is strictly dependent on the deep understanding of significant fatigue parameters as weld defects, stress concentrations and residual stresses and their interaction. In this paper we attempt to present the current knowledge and the physical reasons why the ultrasonic peening treatment is able to improve the fatigue life of welded joints. The local weld geometry or stress concentration, weld imperfections as well as welding residual stresses are all modified and improved by the application of ultrasonic peening. Local weld geometry and weld process inherent weld imperfections are the factors primarily influencing the fatigue strength in welded joints. Comprehensive studies have been carried out during the last 20 years in order to detect and document the weld defects as well as to understand their origin and effect on the fatigue strength of welds. Analogous efforts have been dedicated to understand and document the influence of local weld geometries on the stress concentrations and its influence on endurance and structural integrity. Similarly, efforts have been done to understand the influence of the relaxation by external loads of the by the ultrasonic peening treatment induced compressive stresses. Fatigue test results of ultrasonic peening treated relevant weld details have been used to assess the potential life extension. The results showed four to six times fatigue life extension. The spectrum fatigue test was designed to confirm that relaxation by service loads of the induced compressive stresses during ultrasonic peening treatment would not diminish the benefit.
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Scott-Emuakpor, Onome, Tommy George, Casey Holycross, Jeffrey Brown, and Joseph Beck. "Fatigue Behavior Comparisons Between Ultrasonic and Servohydraulic Axial Testing Procedures." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56387.

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An investigation of cycling rate effects on fatigue life behavior is being conducted on Aluminum (Al) alloys. This effect, along with specimen diameter, highlights the major difference between ultrasonic and servohydraulic fatigue test procedures. Ultrasonic fatigue testing is conducted on a 3.2 mm diameter hourglass specimen operating at 26 kHz, and servohydraulic axial testing is conducted on an ASTM E 466-07 standard dogbone specimen with a 25.4 mm gage length and 4.45 mm diameter operating at 35 Hz. Previous works have shown that cycling rate increases of 100–1000 times can reduce the fatigue crack growth rates in the stress intensity region between threshold and critical by at least an order of magnitude for aluminum and steel. For high cycle fatigue (HCF), however, where the majority of cycles to failure are accumulated before crack initiation, not during propagation, the effects of cycling rate on total loading cycles to failure needs further understanding, which may lead to more accurate and/or less conservative HCF design of critical gas turbine engine components. Fatigue behavior of Al 6061-T6 was assessed between the failure range of 104–1010 cycles using ultrasonic and servohydraulic testing procedures. Though aluminum is not a widely used alloy in gas turbine engine applications, understanding frequency-based fatigue life discrepancies associated with the choice of empirical methods is of paramount importance to component design; Aluminum 6061-T6 is the most cost-effective way to gaining this understanding. Comparisons were made between the fatigue behavior results using cycling rate (also stated as strain-rate or frequency) comparisons for fatigue crack growth study. The comparisons show promising results correlating the fatigue behavior trends of servhydraulic and ultrasonic fatigue data.
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Daugela, Antanas, Vytautas Blechertas, Oden L. Warren, Hiroshi Kutomi, and Thomas J. Wyrobek. "Ultra-Thin Film Ultrasonic Characterization." In STLE/ASME 2003 International Joint Tribology Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/2003-trib-0276.

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Ultrasonically induced nanoscale fatigue and friction reduction phenomena are researched for nanometer order thick protective overcoats. The newly developed method described here is a synergy of the nanometer scale quantitative nanoindentation/scratch technique and ultrasonic excitation. A standing ultrasonic wave is generated at the sample holder during the quasi-static nanoindentation/scratch test at an excitation frequency of several hundreds of kilohertz. Due to the fact that high strain rates are being generated at the surface of the sample, nanofatigue phenomenon followed by delamination and overcoat chipping can be observed. Statistical investigation of fatigue inducing parameters, such as critical quasistatic load and amplitude of oscillations, leads to a means of comparative sample characterization.
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Zhang, Ming, Weiqiang Wang, and 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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Yan, Ling, Lijia Luo, Fengping Zhong, Zuming Zhao, Jingjing Fan, Liuyi Huang, Shiyi Bao, and Jianfeng Mao. "Detection of Fatigue Damage in Aluminum Alloy Structures Using Nonlinear Ultrasonic Modulation." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73423.

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Abstract In this paper, a nonlinear ultrasonic modulation method is developed to detect early fatigue damage in aluminum alloy structures. Seven aluminum alloy specimens with different fatigue damage degrees are prepared by fatigue test. An experimental system is designed for performing nonlinear ultrasound modulation detection of fatigue damage in aluminum alloy specimens. A single piezoceramic transducer is used to emit two superposed sinusoidal waves with different ultrasonic frequencies. The higher frequency is chosen as a non-integer multiple of the lower frequency so as to be distinguished from super-harmonic responses. The dependencies of the nonlinear modulation response on the frequency and amplitude of excitation signals are explored to select appropriate signal excitation parameters. A nonlinear modulation index (NMI) is defined as the amplitude ratio of modulation responses and linear responses, which is used to evaluate fatigue damage of specimens. Experimental results indicate that the NMI increases monotonically with the degree of fatigue damage, and it can be used to quantify the accumulation of fatigue damage in specimens. The proposed nonlinear ultrasound modulation method facilitates the detection of fatigue damage and further assessment of the severity of the damage in aluminum alloy structures.
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Michaels, Thomas E., Jennifer E. Michaels, Adam C. Cobb, Donald O. Thompson, and Dale E. Chimenti. "SIMULTANEOUS ULTRASONIC MONITORING OF CRACK GROWTH AND DYNAMIC LOADS DURING A FULL SCALE FATIGUE TEST OF AN AIRCRAFT WING." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Proceedings of the 35th Annual Review of Progress in Quantitative Nondestructive Evaluation. AIP, 2009. http://dx.doi.org/10.1063/1.3114128.

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