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Journal articles on the topic 'Fatigue tests'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Novosad, Miroslav, Rostislav Fajkoš, Bohuslav Řeha, and Rudolf Řezníček. "Fatigue tests of railway axles." Procedia Engineering 2, no. 1 (April 2010): 2259–68. http://dx.doi.org/10.1016/j.proeng.2010.03.242.

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2

Nowell, D. "Mechanics of fretting fatigue tests." International Journal of Mechanical Sciences 29, no. 5 (1987): 355–56. http://dx.doi.org/10.1016/0020-7403(87)90021-x.

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3

Nowell, D., and D. A. Hills. "Mechanics of fretting fatigue tests." International Journal of Mechanical Sciences 29, no. 5 (January 1987): 355–65. http://dx.doi.org/10.1016/0020-7403(87)90117-2.

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4

Yazawa, T., T. Tosaka, T. Kuriyama, K. Kuwano, M. Igarashi, and M. Terai. "Fatigue Tests of HTS Coils." IEEE Transactions on Appiled Superconductivity 14, no. 2 (June 2004): 1214–17. http://dx.doi.org/10.1109/tasc.2004.830533.

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5

Sheth, Dhaval V. "Use of Geosynthetic Material Under Fatigue and Rut Tests." International Journal of Scientific Research 1, no. 7 (June 1, 2012): 184–89. http://dx.doi.org/10.15373/22778179/dec2012/66.

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6

Dominguese, David J., Jeff Seegmiller, and B. Andrew Krause. "Alterations in Peak Ground-Reaction Force During 60-cm Drop Landings Caused by a Single Session of Repeated Wingate Anaerobic Tests." Journal of Sport Rehabilitation 21, no. 4 (November 2012): 306–12. http://dx.doi.org/10.1123/jsr.21.4.306.

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Context:Lower extremity injury is prevalent among individuals participating in sports. Numerous variables have been reported as predisposing risk factors to injury; however, the effects of muscle fatigue on landing kinetics are unclear.Objectives:To investigate the effects of a single session of repeated muscle fatigue on peak vertical ground-reaction force (GRF) during drop landings.Design:Mixed factorial with repeated measures.Setting:Controlled laboratory.Participants:10 female and 10 male healthy recreational athletes.Intervention:Subjects performed 3 fatigued drop landings (60 cm) after four 20-s Wingate anaerobic tests (WATs) with 5 min of active recovery between fatigued conditions.Main Outcome Measures:Kinetic data of peak forefoot (F1) force, peak rear-foot (F2) force, and anteroposterior (AP) and mediolateral (ML) forces at both F1 and F2.Results:A significant main effect was observed in the nonfatigued and fatigued drop landings in respect to peak F2 force. The greatest significant difference was shown between the first fatigued drop-landing condition and the last fatigued drop-landing condition. No significant difference was observed between genders for all GRF variables across fatigue conditions.Conclusion:A single session of repeated conditions of anaerobic muscle fatigue induced by WATs caused an initial reduction in peak F2 force followed by an increase in peak F2 force across conditions. Muscle fatigue consequently alters landing kinetics, potentially increasing the risk of injury.

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7

Weinges-Evers, Nicholetta, Alexander U. Brandt, Markus Bock, Caspar F. Pfueller, Jan Dörr, Judith Bellmann-Strobl, Peter Scherer, et al. "Correlation of self-assessed fatigue and alertness in multiple sclerosis." Multiple Sclerosis Journal 16, no. 9 (July 7, 2010): 1134–40. http://dx.doi.org/10.1177/1352458510374202.

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Background: Fatigue is the most common symptom in multiple sclerosis patients, but is difficult to measure; quantification thus relies on self-assessed questionnaires. Objective: To evaluate a battery of neuropsychological tests regarding their capacity to objectify self-reported fatigue. Methods: We assessed the correlation between age, gender, education, Kurtzke’s Expanded Disability Status Scale, depression, fatigue and neuropsychological testing using a cross-sectional approach in 110 multiple sclerosis patients. Fatigue was measured with the Fatigue Severity Scale. Cognition was measured using a series of neuropsychological tests including three subtests of the Test of Attentional Performance, the Brief Repeatable Battery of Neuropsychological Tests and the Faces Symbol Test. Results: According to the Fatigue Severity Scale 51.4% of the cohort were fatigued (scores ≥4). Age, education and depression showed a significant correlation with the Fatigue Severity Scale. Only 5.5% of the cohort exhibited cognitive impairment in the Brief Repeatable Battery of Neuropsychological Tests scores. After correction for age, education, Expanded Disability Status Scale and depression, Fatigue Severity Scale scores were an independent predictor of performance in the alertness subtest of the Test of Attentional Performance (standardized coefficient beta = 0.298, p = 0.014). Conclusion: The alertness subtest of the Test of Attentional Performance may offer an objective method of evaluating self-reported fatigue, and may therefore — in addition to the Fatigue Severity Scale — be a suitable tool for the assessment of multiple sclerosis patients complaining of fatigue.

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8

Tsivouraki, Niki, Konstantinos Tserpes, and Ioannis Sioutis. "Modelling of Fatigue Delamination Growth and Prediction of Residual Tensile Strength of Thermoplastic Coupons." Materials 17, no. 2 (January 11, 2024): 362. http://dx.doi.org/10.3390/ma17020362.

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Thermoplastic composites are continuously replacing thermosetting composites in lightweight structures. However, the accomplished work on the fatigue behavior of thermoplastics is quite limited. In the present work, we propose a numerical modeling approach for simulating fatigue delamination growth and predicting the residual tensile strength of quasi-isotropic TC 1225 LM PAEK thermoplastic coupons. The approach was supported and validated by tension and fatigue (non-interrupted and interrupted) tests. Fatigue delamination growth was simulated using a mixed-mode fatigue crack growth model, which was based on the cohesive zone modeling method. Quasi-static tension analyses on pristine and fatigued coupons were performed using a progressive damage model. These analyses were implemented using a set of Hashin-type strain-based failure criteria and a damage mechanics-based material property degradation module. Utilizing the fatigue model, we accurately foretold the expansion of delamination concerning the cycle count across all interfaces. The results agree well with C-scan images taken on fatigued coupons during interruptions of fatigue tests. An unequal and unsymmetric delamination growth was predicted due to the quasi-isotropic layup. Moreover, the combined models capture the decrease in the residual tensile strength of the coupons. During the quasi-static tension analysis of the fatigued coupons, we observed that the primary driving failure mechanisms were the rapid spread of existing delamination and the consequential severe matrix cracking.

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9

YURI, Tetsumi, Toshio OGATA, Kotobu NAGAI, and Keisuke ISHIKAWA. "Fatigue testing system with a helium recondenser and fatigue tests." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 21, no. 3 (1986): 163–68. http://dx.doi.org/10.2221/jcsj.21.163.

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10

Iwasaki, T., and J. G. Wylde. "Corrosion Fatigue Tests on Welded Tubular Joints." Journal of Energy Resources Technology 107, no. 1 (March 1, 1985): 68–73. http://dx.doi.org/10.1115/1.3231165.

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The corrosion fatigue performance of welded tubular joints is recognized as one of the most important factors in the design of offshore structures. Because of the cost of such tests it has been practice to carry out tests on tubular joints in air and to perform corrosion fatigue tests on simple welded joints. Thus very few corrosion fatigue tests have been carried out on tubular joints. The present paper describes the results of fatigue tests which have been carried out on welded tubular joints both in air and in a sea water environment. The specimens were tubular K and KT-joints with chord dimensions of 168 mm diameter and 6 mm wall thickness. The tests were carried out under out-of-plane bending. The corrosion fatigue tests were carried in sea water at 10° C at a frequency of 10 cycles per min, which is typical of wave periods. The specimens were not cathodically protected. The fatigue results in air and sea water are compared, and discussed in connection with the current fatigue design S-N curves for tubular joints contained in various standards.

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11

Černý, Michal, Pavel Mazal, Josef Filípek, and Petr Dostál. "Fatigue strength tests of layered steel." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 1 (2013): 39–49. http://dx.doi.org/10.11118/actaun201361010039.

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The work deals with original measurement of fatigue properties of formed layered steel material – damask steel. This is a material that exhibits a fine micro-structure as well as a regular composition of many material layers with complementary properties. The article experimentally verifies high-cycle fatigue properties of layered steel and evaluates them from the point of view of fatigue tests of conventional steel materials and a parallel application of a non-destructive – acoustic emission – testing. Finally, it discusses the influence of production on fatigue strength and the possibilities of using multi-layered steel materials in technological practice. A serious result of this pilot experiment is the fact documented no only by the fractographic observation, but mainly by the AE records that the fatigue service life of this material is high if it its not stressed by tension approximating the yield point Re. However, such stress is not common in practical use of tools made of damask steel and thus under common bending stress an exceptionally long service life of tools made of this type of material is demonstrable. The fact that damask steel behaves like a homogeneous material is mainly confirmed by the records of the AE signal at lower values of stress σa. When stressed by higher amplitudes of tension σa damask responds in AE records similarly to a laminate material that is stressed by bending.

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12

Skorupka, Zbigniew. "Dynamic Fatigue Tests Of Landing Gears." Fatigue of Aircraft Structures 2020, no. 12 (December 1, 2020): 69–77. http://dx.doi.org/10.2478/fas-2020-0007.

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Abstract Landing gears are one of the main components of an aircraft. The landing gear is used not only during take-off and landing but also, in most cases, during ground manoeuvres. Due to its function, the landing gear is also one of the key safety components of the aircraft due to dissipating landing loads acting on the aircraft. The mentioned loads come from both the vertical and horizontal speeds during touchdown and by the aircraft’s losing the speed by braking. The landing gear is then loaded with constantly changing forces acting in various directions during every landing, with the only difference coming from their magnitude. The repeatable loading conditions cause significant wear of the landing gear. This wear can be divided into two categories, one is the wear of consumable parts such as the brake linings and the other is the fatigue wear of the structural components. The latter type of wear is much more dangerous due to its slow, and in many cases, unnoticeable progression. Fatigue wear can be estimated by numerical analyses – this method works with a great degree of probability on single components but due to the complexity of the landing gear as a whole it is not precise enough to be applied to the full structure. In order to evaluate the fatigue of the whole landing gear the best method accepted by regulations is the laboratory testing method. It involves a series of various drop tests resembling the real landing condition distribution. The aim of the tests is to check the fatigue wear of the landing gear and to prove its reliability for certification and/or operational purposes. In this paper the author describes the basics of the landing gear fatigue wear, possibilities of its evaluation and presents laboratory dynamic method used for extensive tests in life-like operation conditions.

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13

XUE, H., D. WAGNER, N. RANC, and E. BAYRAKTAR. "Thermographic analysis in ultrasonic fatigue tests." Fatigue Fracture of Engineering Materials and Structures 29, no. 7 (July 2006): 573–80. http://dx.doi.org/10.1111/j.1460-2695.2006.01024.x.

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14

Bamba, S., Y. Tanaka, T. Ando, H. Ueda, A. Ishiyama, Y. Yamada, and Y. Shiohara. "Fatigue tests of YBCO coated conductors." Journal of Physics: Conference Series 97 (February 1, 2008): 012170. http://dx.doi.org/10.1088/1742-6596/97/1/012170.

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15

King, Caleb B., Yili Hong, Stephanie P. Dehart, Patrick A. Defeo, and Rong Pan. "Planning Fatigue Tests for Polymer Composites." Journal of Quality Technology 48, no. 3 (July 2016): 227–45. http://dx.doi.org/10.1080/00224065.2016.11918163.

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16

Okura, Ichiro. "Fatigue Tests of Monorail Guideway Girders." Structural Engineering International 1, no. 2 (May 1991): 28–36. http://dx.doi.org/10.2749/101686691780617706.

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17

Pramesti, F. P., A. A. A. Molenaar, M. F. C. van de Ven, J. Qiu, and M. F. Woldekidan. "Comparison of Two Beam Fatigue Tests." Journal of Testing and Evaluation 42, no. 5 (July 1, 2014): 20130226. http://dx.doi.org/10.1520/jte20130226.

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18

Hammer, Cornelius. "Fatigue and exercise tests with fish." Comparative Biochemistry and Physiology Part A: Physiology 112, no. 1 (September 1995): 1–20. http://dx.doi.org/10.1016/0300-9629(95)00060-k.

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19

Dürr, André, Ömer Bucak, and Jakob Roth. "Performance of large‐scale fatigue tests." ce/papers 3, no. 3-4 (September 2019): 603–8. http://dx.doi.org/10.1002/cepa.1107.

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20

Buciumeanu, M., A. S. Miranda, and F. S. Silva. "Evolution of Relevant Parameters on Fretting Fatigue Tests." Key Engineering Materials 385-387 (July 2008): 565–68. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.565.

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The degradation process in fretting fatigue is due to mechanical and chemical attack between two contacting surfaces, being directly related to wear, corrosion and fatigue. There are many parameters that influence the fretting fatigue phenomenon out of which relative displacement, δ , normal load, n F , and tangential load t F , are the most important and consequently the most studied ones. This paper describes the fretting fatigue phenomenon occurring on a high strength aluminium alloy, Al7175. The aim of this study is to achieve a better understanding of the fretting fatigue behaviour by observing the evolution of the fatigue life of the specimen with the normal load, the tangential load and the relative displacement amplitude.

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21

Mao, Ping Li, Zheng Liu, Yang Li, and Li Jia Chen. "Low Cycle Fatigue Behavior of As-Extruded AZ31 Magnesium Alloy." Materials Science Forum 686 (June 2011): 202–7. http://dx.doi.org/10.4028/www.scientific.net/msf.686.202.

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The investigation on fatigue behavior and fracture surfaces of fatigued specimens of as-extruded AZ31 magnesium alloy can provide a reliable theoretical foundation for both fatigue resistant design and reasonable application of magnesium alloys. Through total-strain-amplitude controlled fatigue tests and analysis on fracture surfaces of fatigued specimens, the behavior of cyclic stress response and fatigue life as well as fracture mechanism were identified for as-extruded AZ31 magnesium alloy. The experimental results show that the extruded AZ31 alloy exhibits significant cyclic strain hardening, the relation between elastic strain amplitude, plastic strain amplitude and reversals to failure can be described by Basquin and Coffin-Manson equations respectively. In addition, it has been found that fatigue cracks initiate and propagate in a transgranular mode.

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22

Zijdewind, Inge, and Daniel Kernell. "Bilateral Interactions During Contractions of Intrinsic Hand Muscles." Journal of Neurophysiology 85, no. 5 (May 1, 2001): 1907–13. http://dx.doi.org/10.1152/jn.2001.85.5.1907.

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During demanding voluntary contractions (e.g., high force or fatigue), activation is not restricted to the target muscle but extends to other ipsilateral muscles; even contralateral muscles become activated. The contralateral “irradiation” of activity was measured in five subjects during submaximal and maximal voluntary contractions (MVCs) of the first dorsal interosseous (FDI) (index finger abduction) and during unfatigued and fatigued conditions. All subjects were tested five times with at least one week between tests. Unilateral MVCs were associated with a substantial amount of contralateral FDI activation [mean = 7.9 ± 6.7% (SD) MVC prior to fatigue]. The amount of such contralateral irradiation was significantly different between different individuals and was positively correlated between dominant and nondominant hands. During fatigue tests, the contractile activity of the contralateral “nontarget” index finger showed progressive increase (force, electromyogram) as was measured during both the submaximal task and interspersed MVCs of the target finger. In addition, a superimposed saw-tooth pattern of intermittently waxing and waning contractions commonly appeared contralaterally. The expression of contralateral irradiation force was itself fatigue-sensitive: less irradiation was seen in a recently fatigued muscle than was seen before the fatigue test. These fatigue effects could not be explained as having been caused by changes in muscle properties. Possible anatomical sites of contralateral irradiation are briefly discussed.

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23

Zhang, Wei Chang, Ming Liang Zhu, and Fu Zhen Xuan. "Experimental Characterization of Competition of Surface and Internal Damage in Very High Cycle Fatigue Regime." Key Engineering Materials 754 (September 2017): 79–82. http://dx.doi.org/10.4028/www.scientific.net/kem.754.79.

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Axially push-pull cyclic tests of a low strength rotor steel were performed up to the very high cycle fatigue regime at ambient environment under ultrasonic frequency. Fatigue tests were interrupted at selected number of cycles for surface morphology observation and roughness measurement with the help of a 3D surface measurement system (Alicona InfiniteFocusSL). The fatigue extrusions and slip band developed on the specimen surface were recorded. The influence of stress level on the number and morphology of slip band was discussed. The surface roughness of fatigue specimens was found to be increased with the increasing of fatigue cycles. The fatigued specimens were finally cracked from surface or interior micro-defects after observation of fracture surface by scanning electron microscopy. The internal damage behavior consists of crack initiation and early propagation from micro-defect, crack growth within the fish eye, and fast crack growth. It is observed that there exists a competition between surface and internal fatigue damage in the very high cycle fatigue regime, i.e., surface damage is gradually developed with the increasing of fatigue cycles, while the critical interior micro-defect can be dominant for fatigue cracking.

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Erasov, V. S., and E. I. Oreshko. "FATIGUE TESTS OF METAL MATERIALS (review) Part 1. Main definitions, loading parameters, representation of results of tests." «Aviation Materials and Technologies», no. 4 (2020): 59–70. http://dx.doi.org/10.18577/2071-9140-2020-0-4-59-70.

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The article gives the review of techniques of fatigue tests of metal materials and presents the results of such tests . It has been shown that the low-cyclic fatigue occurs in conditions of elastoplastic deformation in material microvolume from the first cycles of loading. Its distinctive feature is influence on durability of the size and form of a mechanical hysteresis loop . Nucleation of fatigue microcracks and formation of the main crack occurs on the surface and in near-surface layers of a sample.

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25

Cauch-Dudek, K., S. Abbey, D. E. Stewart, and E. J. Heathcote. "Fatigue in primary biliary cirrhosis." Gut 43, no. 5 (November 1, 1998): 705–10. http://dx.doi.org/10.1136/gut.43.5.705.

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Background—Fatigue is a frequent and debilitating symptom in patients with primary biliary cirrhosis (PBC).Aims—To study fatigue in relation to sleep, depression, and liver disease severity.Methods—Patients with PBC completed validated self report questionnaires measuring fatigue, sleep quality, depression, and functional capacity. Verbally reported fatigue and observer rated measure of depression and ursodeoxycholic acid (UDCA) use were recorded. Liver biochemistry and tests to rule out metabolic causes of fatigue were performed.Results—Mean age of the 88 patients enrolled was 57 years; 86% were female and mean duration of disease was 6.6 years. Median bilirubin was 13 μmol/l (mean 18.6). Verbally reported fatigue (for more than six months) was present in 60 patients (68%). The self rated Fatigue Severity Score (FSS) correlated well with verbally reported fatigue (p=0.0001). The FSS did not correlate with age, duration of disease, serum bilirubin, Mayo Risk Score, or UDCA use, but correlation was seen with sleep quality. Fatigued patients had more sleep problems and higher depression scores than non-fatigued patients. Self rated depression was present in 28% (17/60) of fatigued compared with 4% (1/28) of non-fatigued patients.Conclusions—Long term fatigue affected 68% of the patients with PBC but it was not related to the severity of their liver disease. Poor sleep quality and depression were commonly associated with fatigue.

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26

Ishaq, Muhammad Aakif, and Filippo Giustozzi. "Correlation between Rheological Fatigue Tests on Bitumen and Various Cracking Tests on Asphalt Mixtures." Materials 14, no. 24 (December 17, 2021): 7839. http://dx.doi.org/10.3390/ma14247839.

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Accurate characterisation and appropriate binder selection are essential to increase the load-induced cracking resistance of asphalt mixtures at an intermediate temperature. Hence, the primary goal of this study was to correlate the cracking resistance exerted by the binder with the cracking performance of asphalt mixtures. The laboratory-based experimental plan covered various types of laboratory tests specified by various agencies and road authorities to study the correlation of a neat bitumen and five polymer-modified binders with their corresponding asphalt mixtures. The fatigue life of the binders was assessed through a Linear Amplitude Sweep (LAS) test and statistically correlated with various load-induced cracking parameters from the indirect tensile test, semi-circular bending (SCB) test, and four points bending beam test (FPBB) of asphalt mixtures at 25 °C. Binders and mixes were further grouped depending on their polymeric family (i.e., modified with a particular type of polymer) to validate their statistical correlation. The indicator that mostly correlated the binder properties with the asphalt mixture properties is the secant modulus from the SCB test. Fatigue parameters obtained through LAS better explain the asphalt fatigue performance obtained through FPBB; specifically, asphalt tests at high strain levels (e.g., 400 micro strain) better correlate to the LAS fatigue parameter (Nf).

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27

Zhou, Z. R., S. Goudreau, M. Fiset, and A. Cardou. "Single wire fretting fatigue tests for electrical conductor bending fatigue evaluation." Wear 181-183 (March 1995): 537–43. http://dx.doi.org/10.1016/0043-1648(95)90169-8.

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Zhou, Z. "Single wire betting fatigue tests for electrical conductor bending fatigue evaluation." Wear 181-183 (March 1995): 537–43. http://dx.doi.org/10.1016/0043-1648(94)07045-8.

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29

Pierre-Louis, Enold. "Fatigue Margins Established by Unit and Spacecraft Protoqualification Tests." Journal of the IEST 53, no. 2 (October 1, 2010): 24–34. http://dx.doi.org/10.17764/jiet.53.2.y64w73r736v8m375.

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Protoqualification (PQ) testing, typically performed on the first assembled electronic units and spacecraft, establish random vibration and thermal cycling fatigue margins for subsequent builds that are only subjected to the acceptance test program (ATP). Considering the fatigue damage induced by both unit- and spacecraft-level testing, fatigue margins are calculated for equipment exposed to ATP-level testing. Probabilistic analyses are also performed to determine the relationship between the fatigue margin and the demonstrated reliability for the unit to survive the mission. Parameters such as the number of retests and the material dependent fatigue acceleration exponent are considered. Using MIL-STD-1540E,1 PQ random vibration test guidelines of three decibels (+3 dB) above the acceptance input level for 2-minute-per-axis duration, the assessment shows that the test establishes ample fatigue margin for units subjected to the less stringent ATP. The probabilistic analysis shows that the established reliability to survive the launch environment without a fatigue induced failure is adequate. It is further shown that the desired high-cycle fatigue life factor of greater than four is maintained even after one unit retest is performed. However, since this conclusion is general in nature, it is important that for future spacecraft, assessments be performed for both PQ and ATP hardware, taking into account each specific design and application to verify that adequate fatigue margin exists to survive launch. Because mission thermal cyclic environments vary greatly with regard to the number of cycles and the extent of the thermal range for each cycle, MIL-STD-1540E PQ guidelines for unit-level testing were designed to verify the design and workmanship and not intended to demonstrate fatigue margin for specific missions. Rather, MIL-STD-1540E specifies that thermal cyclic fatigue margin for the combination of pre-launch and orbital environments should be demonstrated with life testing. Accordingly, the analysis shows that PQ testing only demonstrates the desired low-cycle fatigue life factor of 2 for subsequent units which are subjected to a single ATP. The fatigue life factor falls below 2 when retests and/or mission thermal cyclic environments are considered. Because acceptable fatigue margin is not established with the standard PQ thermal cycle test procedure, it is essential that other means be taken to ensure that adequate fatigue margin exists. This paper provides guidelines for using analyses and offline life testing to assess the fatigue life of critical units and their internal components for pre-launch and orbital thermal cyclic environments.

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Yamamoto, S., K. Isobe, S. Ohte, N. Tanaka, S. Ozaki, and K. Kimura. "Fatigue and Creep-Fatigue Testing of Bellows at Elevated Temperature." Journal of Pressure Vessel Technology 110, no. 3 (August 1, 1988): 301–7. http://dx.doi.org/10.1115/1.3265603.

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Fatigue and creep-fatigue tests at elevated temperature were conducted on two different-sized bellows, φ 1100 mm and φ 300 mm in nominal inner diameter, to investigate the fatigue life and the creep-fatigue interaction in a bellows, and also to provide test data for developing a life prediction method and design-by-analysis rules for bellows in elevated temperature service. A series of tests consisted of strain behavior and fatigue tests at room temperature, and fatigue and creep-fatigue tests at elevated temperature. Also, inelastic finite element analyses were performed on a bellows under internal pressure and cyclic axial deflections. Analytical results were compared with the measured data obtained in the room temperature testing to verify the strain prediction method.

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Huang, Chou-Dian, Jiun-Ren Hwang, and Jiunn-Yuan Huang. "Prediction of Fatigue Crack Growth in Vacuum-Brazed Titanium Alloy." Metals 13, no. 11 (November 12, 2023): 1879. http://dx.doi.org/10.3390/met13111879.

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The assessment of fatigue is a crucial concern in welded components and structures. This study investigates the fatigue properties and models for predicting fatigue crack growth in Ti-6Al-4V titanium alloy when processed by vacuum brazing with TiCuNi filler. Fatigue properties and the impact of the stress ratio were determined through constant amplitude fatigue tests. By utilizing the results obtained from variable amplitude fatigue tests, various prediction models for fatigue crack growth were examined: modifications for load interaction, residual stress, and crack closure. The results indicate that the microstructures in the brazed zone consist of numerous fine, elongated needle-like Widmanstätten structures. In terms of cycle counting methods, the rainflow method outperforms the simple-range method. In the stable crack growth rate region, fatigue crack growth rate increases with the rise in stress ratio in a manner similar to high-strength steels. The Paris model without any modification obtains good predictions. For models modified with crack closure, the Elber model yields slightly better prediction results than the Schijve model. Among fatigue crack growth prediction models, the Willenborg model with residual stress modification produces the best results. Fracture surfaces within fatigued specimens’ brazed zones exhibit ductile failure characteristics, where fatigue striations and secondary cracks were observed.

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Ohgi, Jun Ji, S. Tanaka, T. Kuramoto, M. Suzuki, and Koichi Goda. "Stress-Strain Response in SiC/SiC Composites under Cyclic Loading." Key Engineering Materials 353-358 (September 2007): 1406–9. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1406.

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The tension-tension fatigue tests for SiC/SiC composites were performed under the conditions that the maximum load Pmax was 80-90% to the fracture load of the tensile tests and the stress ratio was Rσ = 0.5. The composites exhibited a width in stress-strain hysteresis loop under one load cycling. In some cases the mean strain εmean gradually increase with increasing in number of cycles. These variations would reflect the developments of the fatigue damage at the fiber/matrix interface during the cyclic loading process. The pull-out lengths of the fibers for the fatigued- and not fatigued-specimens were measured through the SEM observations after the tensile test. In all materials, the average pull-out length of fibers in fatigued material was larger than in not fatigued material because the cyclic loading affected on the fiber/matrix interfacial strength.

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Hashimura, Shinji, Tetsuya Torii, Yukio Miyashita, Shigeru Yamanaka, and Genki Hibi. "Fatigue Characteristics of Nonferrous Bolts." Key Engineering Materials 577-578 (September 2013): 417–20. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.417.

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Fatigue characteristics of bolted joint tightened with a steel bolt have been discussed extensively. However the fatigue characteristics of bolted joint tightened with a nonferrous bolt have not been sufficiently discussed. In this study, two types of fatigue tests, axial fatigue tests and transverse fatigue tests, for nonferrous bolts were conducted. The nonferrous bolts used in this study made of AZ31 and AZX912 magnesium alloy and A5056 aluminum alloy. The results of both fatigue tests showed that the fatigue limits of the A5056 bolt were the highest of all. The fatigue limits of two kinds of the magnesium alloy bolts were almost the same in both fatigue tests. However the ration of the axial fatigue limits to the transverse fatigue limits were different according to the bolt materials.

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Reis, Paulo N. B., José A. Martins Ferreira, Fernando Antunes, and José Domingos M. Costa. "Fatigue Notch Sensibility of Thermoplastic Glass Fibre Composites." Materials Science Forum 514-516 (May 2006): 653–56. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.653.

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This paper is concerned with a notch sensibility study of a thermoplastic composite produced from a bi-directional woven E-glass fibres and polypropylene. Experimental tests were performed in three points bending using notched and unotched specimens of polypropylene glass fibres reinforced laminates to evaluate flexural properties and fatigue behaviour. Fatigue results were plotted as the stress range against the number of cycles to failure. The fatigue damage was measured in terms of the stiffness loss. The testes carried out using notched specimens present lower values of both static and fatigue strengths than the unnotched specimens tests.

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Takamori, Hiroyuki, and John W. Fisher. "Tests of Large Girders Treated To Enhance Fatigue Strength." Transportation Research Record: Journal of the Transportation Research Board 1696, no. 1 (January 2000): 93–99. http://dx.doi.org/10.3141/1696-12.

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Two large-scale fatigue test studies of plate girders are reported on. One study involved a series of coverplated bridge girders with small fatigue cracks that were retrofitted in 1976 as described in NCHRP Report 206. The second study involved plate girders fabricated from HPS-485W (HPS-70W) steel with welded attachments. The Category E’ coverplated beams that were removed from the I-95 Yellow Mill Pond Bridge in 1997 had been retrofitted in 1976 by either air hammer peening or gas tungsten arc (GTA) remelting. All details had small fatigue cracks at the time of retrofit. No further fatigue cracking was observed at the coverplate ends after 20 years of service and an estimated 56 million truck passages. The beams were tested at a stress range of 69 MPa (10 ksi). Cracks developed from the root of the transverse end weld and propagated through the weld throat. The fatigue resistance of the treated weld toe details improved to Category C except for one GTA-remelted detail, which exceeded Category D. Another study was carried out on large-scale HPS-485W plate girders with as-welded and ultrasonic-impact treatment (UIT) details. UIT was applied to the weld toe of transverse stiffeners welded to the web and flanges (Category C) and to coverplated ends (Category E’). The as-welded details cracked at their expected fatigue resistance. The UIT transverse stiffeners improved to Category B fatigue resistance, whereas the UIT coverplated details improved to Category C fatigue resistance.

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36

Santus, Ciro, Lorenzo Romanelli, Leonardo Bertini, Alessandro Burchianti, and Tomoya Inoue. "Resonant Fatigue Tests on Polished Drill Pipe Specimens." Machines 12, no. 5 (May 3, 2024): 314. http://dx.doi.org/10.3390/machines12050314.

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In this study, the fatigue strength of polished drill pipe specimens was investigated and compared with previous test results of corroded and not-corroded pipes. The resonant fatigue test rig, which was designed and implemented by the University of Pisa, is initially presented by providing a detailed description of the set-up of the machine, the calibration of the strain gauges, the control system, and the correct identification of the vibrational node locations. A polishing rig was also designed and put into operation to remove the corrosion pits from the outer surface of almost the entire length of the drill pipe specimens. After the fatigue tests with the resonant rig, and the observation of the fatigue fracture of the specimens, a few samples were extracted from different zones (corroded and not corroded) of the failed drill pipe specimens. This allowed for investigations to be carried out using a scanning electronic microscope. The obtained results were analyzed using the Murakami model, and a discussion is presented about the effect of the corrosion pits on the fatigue strength.

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KITAGAWA, Masaki, and Koji YAMAGUCHI. "VAMAS Low Cycle Fatigue Round Robin Tests." Tetsu-to-Hagane 78, no. 9 (1992): 1431–40. http://dx.doi.org/10.2355/tetsutohagane1955.78.9_1431.

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Patel, Prachi. "Tests elucidate high fatigue lifetime of graphene." MRS Bulletin 45, no. 5 (May 2020): 337. http://dx.doi.org/10.1557/mrs.2020.132.

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Almamoori, M. K., Y. Alizadeh, and M. Abolghasemzadeh. "A Review of Multi-Axial Fatigue Tests." IOP Conference Series: Materials Science and Engineering 1094, no. 1 (February 1, 2021): 012058. http://dx.doi.org/10.1088/1757-899x/1094/1/012058.

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40

Vázquez, J., D. Erena, C. Navarro, and J. Domínguez. "3D contact effects in fretting fatigue tests." Theoretical and Applied Fracture Mechanics 118 (April 2022): 103260. http://dx.doi.org/10.1016/j.tafmec.2022.103260.

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41

Väntänen, Miikka, Joona Vaara, Jukka Aho, Jukka Kemppainen, and Tero Frondelius. "Bayesian Sequential Experimental Design for Fatigue Tests." Rakenteiden Mekaniikka 50, no. 3 (August 21, 2017): 201–5. http://dx.doi.org/10.23998/rm.64924.

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A Bayesian sequential experimental design for fatigue testing was implemented on the basis on D-optimality and a non-linear continuous damage model. The design accounts for the whole range of testing levels.

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Mitchell, M. R., R. E. Link, Yung-Li Lee, Dennis Polehna, and Hong-Tae Kang. "Fatigue Damage Severity Calculation for Vibration Tests." Journal of Testing and Evaluation 38, no. 6 (2010): 102994. http://dx.doi.org/10.1520/jte102994.

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43

Lipski, Adam, and Stanisław Mroziński. "Cast Steel Tests under Thermal Fatigue Conditions." Solid State Phenomena 224 (November 2014): 105–11. http://dx.doi.org/10.4028/www.scientific.net/ssp.224.105.

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This paper presents results of experimental research and numerical calculations for thermal fatigue of G-X12CrMoVNbN9-1 martensitic cast steel. The tests were performed using hydraulic testing machine equipped with the heating chamber. The experimental research included static tests under mechanical load conditions at four temperature levels (20°C, 400°C, 550°C, 600°C) aimed at determining material characteristics needed for the numerical model. Main cyclic tests were carried out under thermal load conditions. The parameter, which was maintained at unchanged level during tests was the specimen strain ε = const = 0. The specimen temperature was changed. The numerical calculations for the same temperature change program were performed with the use of ABAQUS software. Experimentally and numerically determined stress value versus test time were compared.

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Viana da Fonseca, A., S. Rios, M. F. Amaral, and F. Panico. "Fatigue Cyclic Tests on Artificially Cemented Soil." Geotechnical Testing Journal 36, no. 2 (January 2013): 20120113. http://dx.doi.org/10.1520/gtj20120113.

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Kocabicak, U., and M. Firat. "Numerical analysis of wheel cornering fatigue tests." Engineering Failure Analysis 8, no. 4 (August 2001): 339–54. http://dx.doi.org/10.1016/s1350-6307(00)00031-5.

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Battez, A. Hernandez, J. E. Fernandez Rico, and R. Chou Rodriguez. "Rolling fatigue tests of three polyglycol lubricants." Wear 258, no. 10 (May 2005): 1467–70. http://dx.doi.org/10.1016/j.wear.2004.11.010.

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Wu, T. W., A. L. Shull, and R. Berriche. "Microindentation fatigue tests on submicron carbon films." Surface and Coatings Technology 47, no. 1-3 (August 1991): 696–709. http://dx.doi.org/10.1016/0257-8972(91)90343-u.

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Prisekin, V. L., N. V. Pustovoi, and G. I. Rastorguev. "Algorithms for controlling fatigue tests of airplanes." Journal of Applied Mechanics and Technical Physics 55, no. 1 (January 2014): 164–71. http://dx.doi.org/10.1134/s0021894414010192.

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Belokurov, V. N., and O. B. Balakovskii. "A Grip for Rotating Bending Fatigue Tests." Strength of Materials 47, no. 2 (March 2015): 372–73. http://dx.doi.org/10.1007/s11223-015-9667-6.

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CAPEENVIRONMENTALENGINEERINGLT. "UK firm fatigue tests artificial limb components." International Journal of Fatigue 9, no. 4 (October 1987): 248. http://dx.doi.org/10.1016/0142-1123(87)90035-1.

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