Relevant bibliographies by topics / Very High Cycle Fatigue, VHCF, ultrasonic testing, size effect

Academic literature on the topic 'Very High Cycle Fatigue, VHCF, ultrasonic testing, size effect'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Very High Cycle Fatigue, VHCF, ultrasonic testing, size effect"

1

Tridello, Andrea, Davide Salvatore Paolino, and Massimo Rossetto. "Ultrasonic VHCF Tests on Very Large Specimens with Risk-Volume Up to 5000 mm3." Applied Sciences 10, no. 7 (March 25, 2020): 2210. http://dx.doi.org/10.3390/app10072210.

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The research on the size-effects in Very-High-Cycle Fatigue (VHCF) has recently drawn the attention of several scholars. The fatigue cracks in VHCF originate from the largest defect present within the loaded material volume (risk-volume) and the larger the risk-volume, the larger the probability of critical defects affecting the VHCF response (size-effect). Many models have been proposed in the literature to deal with size-effects in VHCF. However, the proposed models cannot be validated on full-scale components, since VHCF tests are typically carried out with ultrasonic fatigue testing machines. The authors have proposed a specimen geometry, the so-called Gaussian specimens, to enlarge as much as possible the risk-volume in ultrasonic VHCF tests. In this study, fully reversed tension–compression ultrasonic VHCF tests up to 109 cycles were carried out on AISI H13 steel Gaussian specimens with a risk-volume of 5000 mm3, two times larger than the largest tested in the literature. The stress distribution and the absence of bending loads were verified with strain gages, proving that VHCF tests on risk-volumes of 5000 mm3 can be reliably carried out. Ultrasonic VHCF tests were also carried out on small hourglass specimens, confirming that larger risk-volumes allow for a more reliable design against VHCF failures.
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Tridello, A., D. S. Paolino, G. Chiandussi, and Massimo Rossetto. "Gaussian Specimens for Gigacycle Fatigue Tests: Evaluation of Temperature Increment." Key Engineering Materials 627 (September 2014): 85–88. http://dx.doi.org/10.4028/www.scientific.net/kem.627.85.

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Experimental tests investigating very-high-cycle fatigue (VHCF) properties of materials are commonly performed with ultrasonic testing machines, which allow for a significant reduction of testing time. In order to evaluate the effect of tested material volume (size-effect) on VHCF properties, the Authors recently proposed to adopt Gaussian specimens for VHCF tests. Investigation of size-effect with Gaussian specimen induces large mechanical power dissipation and temperature increment that must be taken into account. The present paper proposes an analytical model, which allows to approximately predict the dissipated mechanical power and the temperature increment in Gaussian specimens. The analytical model is also numerically verified through a Finite Element Analysis.
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Ghadimi, Hamed, Arash P. Jirandehi, Saber Nemati, Huan Ding, Abdelrahman Garbie, Jonathan Raush, Congyuan Zeng, and Shengmin Guo. "Effects of Printing Layer Orientation on the High-Frequency Bending-Fatigue Life and Tensile Strength of Additively Manufactured 17-4 PH Stainless Steel." Materials 16, no. 2 (January 4, 2023): 469. http://dx.doi.org/10.3390/ma16020469.

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In this paper, small blocks of 17-4 PH stainless steel were manufactured via extrusion-based bound powder extrusion (BPE)/atomic diffusion additive manufacturing (ADAM) technology in two different orientations. Ultrasonic bending-fatigue and uniaxial tensile tests were carried out on the test specimens prepared from the AM blocks. Specifically, a recently-introduced small-size specimen design is employed to carry out time-efficient fatigue tests. Based on the results of the testing, the stress–life (S-N) curves were created in the very high-cycle fatigue (VHCF) regime. The effects of the printing orientation on the fatigue life and tensile strength were discussed, supported by fractography taken from the specimens’ fracture surfaces. The findings of the tensile test and the fatigue test revealed that vertically-oriented test specimens had lower ductility and a shorter fatigue life than their horizontally-oriented counterparts. The resulting S-N curves were also compared against existing data in the open literature. It is concluded that the large-sized pores (which originated from the extrusion process) along the track boundaries strongly affect the fatigue life and elongation of the AM parts.
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Gao, Tao, Zhidan Sun, Hongqian Xue, and Delphine Retraint. "Effect of Surface Mechanical Attrition Treatment on the very high cycle fatigue behavior of TC11." MATEC Web of Conferences 165 (2018): 09001. http://dx.doi.org/10.1051/matecconf/201816509001.

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As an important engine component material, TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) titanium alloy is subjected to high frequency cyclic loading and its failure occurs beyond 109 cycles. It is thus essential to investigate the very high cycle fatigue (VHCF) behavior of this alloy. Surface Mechanical Attrition Treatment (SMAT) is a promising surface treatment technique to improve fatigue strength by modifying the surface microstructure. Therefore, it is important to understand the fatigue damage and failure process of SMATed titanium alloy in the VHCF regime. In this work, VHCF tests of TC11 before and after SMAT under fully reversed loading were conducted at room temperature by using an ultrasonic fatigue testing machine at a frequency of 20 kHz. The preliminary results seem to indicate that SMAT can reduce fatigue strength and fatigue life of TC11. Fracture surface analysis of the specimens before and after SMAT was performed using scanning electron microscope (SEM) to investigate the mechanisms of crack initiation and propagation. Particular attention was paid to fatigue crack initiation sites. The effect of SMAT on damage mechanism of SMATed TC11 in the VHCF regime was discussed.
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Xiong, Zhihong, Takashi Naoe, and Masatoshi Futakawa. "Effect of Artificial Defects on the Very High Cycle Fatigue Behavior of 316L Stainless Steel." Metals 9, no. 4 (April 4, 2019): 412. http://dx.doi.org/10.3390/met9040412.

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Widely used for structural materials in nuclear engineering, 316L austenitic stainless steel undergoes very high cycle fatigue (VHCF) throughout its service life. Since defects caused by service conditions are unavoidable in many engineering components during service life, the effects should be properly understood. In the present study, the effect of surface defects on the VHCF behavior were investigated on solution annealed (SA) and cold-worked (CW) 316L. Surface defects were artificially created using indentation. The VHCF test was conducted using an ultrasonic fatigue testing system. The results showed that the fatigue crack initiation was independent of the indent with the applied range of depth in this research. Furthermore, the critical depth of the indent was evaluated based on an empirical formula (Murakami’s model). In the case of SA 316L, the VHCF strength was not affected when the indent depth was less than 40 μm, which is consistent with the value obtained from the empirical formula. In the case of 20% CW 316L, the VHCF strength was not affected when the indent depth was less than 80 μm. The experimental results, i.e., the critical depth of the indent, were much larger than the results obtained from the empirical formula, and might have been caused by the plastic deformation, residual stress, and probable deformation-induced martensite transition around the indent.
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Gao, Tao, Zhidan Sun, Hongqian Xue, Emin Bayraktar, Zhi Qin, Bin Li, and Han Zhang. "Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime." Metals 10, no. 11 (November 12, 2020): 1507. http://dx.doi.org/10.3390/met10111507.

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In this work, the effect of a turning process on fatigue performance of a Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) titanium alloy is studied in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes. For this purpose, the surface characteristics including surface morphology, surface roughness and residual stress were investigated. Moreover, axial fatigue tests were conducted with an ultrasonic fatigue testing system working at a frequency of 20 kHz. The results show that the turning process deteriorated the fatigue properties in both HCF and VHCF regimes. The fatigue strength at 1 × 108 cycles of turned samples is approximately 6% lower than that of electropolished ones. Fracture surface observations indicate that turning marks play a crucial role in the fatigue damage process, especially in the crack initiation stage. It was observed that the crack of all the turned samples originated from turning marks. In addition, the compressive residual stress induced by the turning process played a more effective role in resisting crack propagation in the VHCF regime than in the HCF regime.
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Bülbül, Fatih, Tina Kirsten, Marcel Wicke, Martina Zimmermann, Angelika Brückner-Foit, and Hans-Jürgen Christ. "Crack growth behaviour of aluminium wrought alloys in the Very High Cycle Fatigue regime." MATEC Web of Conferences 165 (2018): 20007. http://dx.doi.org/10.1051/matecconf/2018165020007.

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Investigations have shown that in the regime of Very High Cycle Fatigue (VHCF) “natural” crack initiation often takes place underneath the material surface leading to crack propagation without contact to atmospheric components. In order to elucidate the environmental damage contribution and its effect on the VHCF long crack propagation, fatigue experiments with alternating environment (vacuum and laboratory air) were performed. An ultrasonic fatigue testing system (USFT) equipped with a small vacuum chamber was applied that enables the in-situ examination of the long fatigue crack propagation at a resonance frequency of about 20 kHz by using a long distance microscope. By means of the Focused-Ion-Beam technique, micro-notches were prepared in the USFT specimens. The tests were carried out on the aluminium alloys EN-AW 6082 and 5083 in different conditions. It has been found that the atmosphere has a significant influence on the VHCF long crack propagation which manifests itself in the crack path as well as in the crack growth rates. Because of pronounced single sliding in vacuum, shear-stress-controlled crack propagation was detected whereas in laboratory air normal-stress-controlled crack propagation occurred. Furthermore, it has been proven that the secondary precipitation state of the aluminium alloy significantly influences the VHCF long crack propagation in vacuum.
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Bülbül, Fatih, Tina Kirsten, Marcel Wicke, Martina Zimmermann, Angelika Brückner-Foit, and Hans-Jürgen Christ. "Crack growth behaviour of aluminium wrought alloys in the Very High Cycle Fatigue regime." MATEC Web of Conferences 165 (2018): 20007. http://dx.doi.org/10.1051/matecconf/201816520007.

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Investigations have shown that in the regime of Very High Cycle Fatigue (VHCF) “natural” crack initiation often takes place underneath the material surface leading to crack propagation without contact to atmospheric components. In order to elucidate the environmental damage contribution and its effect on the VHCF long crack propagation, fatigue experiments with alternating environment (vacuum and laboratory air) were performed. An ultrasonic fatigue testing system (USFT) equipped with a small vacuum chamber was applied that enables the in-situ examination of the long fatigue crack propagation at a resonance frequency of about 20 kHz by using a long distance microscope. By means of the Focused-Ion-Beam technique, micro-notches were prepared in the USFT specimens. The tests were carried out on the aluminium alloys EN-AW 6082 and 5083 in different conditions. It has been found that the atmosphere has a significant influence on the VHCF long crack propagation which manifests itself in the crack path as well as in the crack growth rates. Because of pronounced single sliding in vacuum, shear-stress-controlled crack propagation was detected whereas in laboratory air normal-stress-controlled crack propagation occurred. Furthermore, it has been proven that the secondary precipitation state of the aluminium alloy significantly influences the VHCF long crack propagation in vacuum.
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9

Schneider, Norbert, Brita Pyttel, Christina Berger, and Matthias Oechsner. "Influence of Frequency and Testing Technique on the Fatigue Behaviour of Quenched and Tempered Steel in the VHCF-Regime." Advanced Materials Research 891-892 (March 2014): 1430–35. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1430.

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Today in many cases ultrasonic testing machines with a frequency of f ≈ 20 kHz are used for investigations of the fatigue behaviour up to the very high cycle regime (VHCF-regime). A question that arises is if the results of these high frequency fatigue tests are comparable to conventional fatigue tests. This paper compares the fatigue behaviour of a quenched and tempered steel 50CrMo4 in two different tempered conditions investigated at low frequencies (f ≤ 400 Hz) on a servohydraulic testing machine and at a high frequency (f ≈ 20 kHz) on an ultrasonic fatigue testing machine. Effects which can occur because of the different testing techniques and testing frequencies are investigated. A concept is derived to describe the frequency effect caused by the strain rate. The estimations are compared with results of the fatigue tests.
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Paolino, Davide S., Andrea Tridello, Jacopo Fiocchi, Carlo A. Biffi, Giorgio Chiandussi, Massimo Rossetto, and Ausonio Tuissi. "VHCF Response up to 109 Cycles of SLM AlSi10Mg Specimens Built in a Vertical Direction." Applied Sciences 9, no. 15 (July 24, 2019): 2954. http://dx.doi.org/10.3390/app9152954.

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It is well-known that many manufacturing parameters affect the quasi-static and the fatigue response of additive manufacturing (AM) parts. In particular, due to the layer-by-layer production, the load orientation, with respect to the building direction, plays a fundamental role for the fatigue response. This paper investigates the fatigue response up to 109 cycles (very high cycle fatigue (VHCF)) of selective laser melting (SLM) AlSi10Mg specimens built in a vertical direction. Ultrasonic tension-compression tests (stress ratio of –1) are carried out on as-built Gaussian specimens with a large loaded volume (2300 mm3). Fracture surfaces are investigated with the scanning electron microscope to analyze the defects originating the VHCF failure. Probabilistic S-N curves are estimated and analyzed. Experimental results confirm that the defect size controls the VHCF response, thus highlighting the importance of testing large risk volumes for a reliable assessment of VHCF behavior. The average value of the VHCF strength is close to that of the hourglass specimen tested in the literature. The variability of the VHCF strength is instead significantly larger, due to the scattered size distribution of the defects located near the specimen surface, which is the most critical region for crack initiation.
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Dissertations / Theses on the topic "Very High Cycle Fatigue, VHCF, ultrasonic testing, size effect"

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TRIDELLO, ANDREA. "A novel experimental approach for the assessment of size effect in VHCF." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2643503.

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The continuous increment of the required design lifetime for many machinery components and the experimental evidence that materials could fail at stress amplitudes below the conventional fatigue limit have led to a growing interest in the study of the Very-High-Cycle Fatigue (VHCF) behavior of materials. Experimental results showed that materials in the VHCF regime could fail generally due to cracks nucleating around defects within the material (internal nucleation). Therefore, it is generally acknowledged in the literature that the VHCF response of materials is strongly affected by the defect population and, in particular, by the characteristic defect size, which statistically increases with the material volume. According to this well-known dependency, experimental results showed that the larger the loaded volume (risk-volume), the smaller the VHCF strength (size effect). However, a significant increment of the risk-volume is not possible with common specimen shapes used for ultrasonic tests. As a consequence, size effect at large risk-volumes is generally statistically predicted, without any experimental validation. The thesis proposes a new experimental approach for the assessment of size effect in the VHCF regime. Fully reversed tension–compression tests were carried out on specimens with significantly different risk-volumes (hourgalss and Gaussian specimens) by using the ultrasonic testing machines developed at Politecnico di Torino during the Ph.D. The experimental results were analyzed by considering and integrating the well-known statistical models proposed in the literature. A methodology for obtaining reliable and conservative predictions of the VHCF response of materials at different risk-volumes is proposed and discussed in the thesis. Finally, a simple numerical-experimental procedure for the design of components subjected to VHCF failures and characterized by large risk-volumes is proposed.
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MONTAGNOLI, FRANCESCO. "Very-High Cycle Fatigue: Size Effects and Applications in Civil Engineering." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2945177.

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Conference papers on the topic "Very High Cycle Fatigue, VHCF, ultrasonic testing, size effect"

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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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