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Articoli di riviste sul tema "Metal fatigue"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 21 febbraio 2023

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1

Murakami, Yukitaka. "PL-2 Hydrogen-Material Interaction in Metal Fatigue". Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007.6 (2007): _PL—2–1_—_PL—2–8_. http://dx.doi.org/10.1299/jsmeatem.2007.6._pl-2-1_.

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2

Itoh, Y. Z., e H. Kashiwaya. "Low-Cycle Fatigue Properties of Steels and Their Weld Metals". Journal of Engineering Materials and Technology 111, n. 4 (1 ottobre 1989): 431–37. http://dx.doi.org/10.1115/1.3226491.

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Completely reversed, strain-controlled, low-cycle fatigue behavior at room temperature is investigated for steels and their weld metals. Weld metal specimens were taken from multi-pass weld metal deposited by shield metal arc welding (SMAW) and gas metal arc welding (GMAW), such that their gage length consisted entirely of the weld metal. Results indicate that there is a trend toward reduction in the low-cycle fatigue life of weld metals as compared with the base metals. In low carbon steel weld metals, the tendency described above is explained in terms of local plastic strain concentration by lack of uniformity of the multi-pass weld metals. The weld metals do not have the same mechanical properties anywhere as confirmed by hardness distribution, and the fatigue crack grows preferentially through the temper softened region in the multi-pass welds. In Type 308 stainless steel weld metals, the ductility reduction causes reductions in low-cycle fatigue life. This study leads to the conclusion that fairly accurate estimates of the low-cycle fatigue life of weld metals can be obtained using Manson’s universal slope method. However, life estimates of the Type 304 stainless steel is difficult due to a lack of ductility caused by a deformation-induced martensitic transformation.

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3

Fissolo, A., V. Maillot, G. Degallaix, S. Degallaix, N. Haddar, J. C. Le Roux, J. M. Stephan, C. Amzallag e F. Bouchet. "Multiple cracking under thermal fatigue". Revue de Métallurgie 101, n. 12 (dicembre 2004): 1087–99. http://dx.doi.org/10.1051/metal:2004112.

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4

Molent, L., e B. Dixon. "Airframe metal fatigue revisited". International Journal of Fatigue 131 (febbraio 2020): 105323. http://dx.doi.org/10.1016/j.ijfatigue.2019.105323.

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5

Shimamura, Yoshinobu, Keiichiro Tohgo, Hiroyasu Araki, Yosuke Mizuno, Shoji Kawaguchi, Masaru Hashimto e Tokuichi Inoue. "Fatigue of Metal Free Reed due to Self-Excited Oscillation". Advanced Materials Research 33-37 (marzo 2008): 267–72. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.267.

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Metal free reeds are used for musical instruments like harmonica. Free reeds are small, thin cantilevers, and oscillate by blowing air. It is reported that free reeds break due to fatigue during play. In order to elongate the life of free reeds, the fatigue properties should be investigated and a motion analysis method should be developed. The experimental and analytical research on metal free reed, however, has been rarely reported. In this study, two types of fatigue testing machines were developed to obtain basic fatigue characteristics. The fatigue testing machines are designed for bending fatigue of actual free reeds whose thickness is less than 400 μm. An S-N diagram is successfully obtained up to 107 cycles by using the developed fatigue testing machines. The fracture surfaces of fatigued specimens are in good agreement with those of free reeds failed in use. Then, an analytical method for the self-excited oscillation of free reeds was developed based on a mass-damper-spring model. The proposed method can take account for the shape of free reed. The self-excited oscillation of free reeds with different shape are analyzed and in good agreement with experimental results.

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6

Okazaki, M., Y. Mutoh e M. Yamaguchi. "Creep-Fatigue Fracture of Dissimilar Metal Electron Beam Welded Joints at Elevated Temperature". Journal of Engineering Materials and Technology 110, n. 3 (1 luglio 1988): 212–18. http://dx.doi.org/10.1115/1.3226039.

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Creep-fatigue tests of dissimilar-metal electron beam welded joints between A387 Gr.22 ferritic low-alloy steel and AISI 405 ferritic stainless steel were carried out under strain-controlled cycling at a temperature of 873 K. It was found that the creep-fatigue life of a dissimilar metal welded joint was significantly shorter than those of its base metals. This resulted from the strain concentration on the AISI 405 side (with the lower deformation resistance.) It was also found that the hardness distribution was one of the important measures by which the local strain distribution was reflected. Furthermore, a simple prediction method for the creep-fatigue life of dissimilar metal welded joints was proposed based on the creep-fatigue life properties of its base metals by applying the strain range partitioning approach. The predicted lives were in good agreement with the experimental results.

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7

Gaier, C., B. Unger e H. Dannbauer. "Multiaxial fatigue analysis of orthotropic materials". Revue de Métallurgie 107, n. 9 (ottobre 2010): 369–75. http://dx.doi.org/10.1051/metal/2011002.

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8

Isa, Halim, A. R. Omar, A. M. Saman, I. Othman e M. A. Ali. "Analysis of Time-to-Fatigue for Standing Jobs in Metal Stamping Industry". Advanced Materials Research 433-440 (gennaio 2012): 2155–61. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.2155.

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In metal stamping industry, almost all jobs are practically to be performed in standing position. Standing in a long period of time can lead to muscle fatigue. The objective of this study was to determine time-to-fatigue in the erector spinae, tibialis anterior, and gastrocnemius muscles of twenty production workers in a metal stamping company. The muscles activity was concurrently measured using surface electromyography (sEMG) during beginning, mid, and end of working sessions. Results of study found that gastrocnemius muscle fatigued earlier during all working sessions. In addition, working at the end of working session showed earlier fatigue than the beginning and mid of work days. The study concluded that standing in a long period of time is a cause to muscle fatigue experienced by the production workers.

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9

Abdulraoof Abdulrazzaq, Mohammed. "Effect of Shot Peening on Mechanical Properties for Steel AISI 1008". DJES 12, n. 2 (1 giugno 2019): 54–64. http://dx.doi.org/10.24237/djes.2019.12205.

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Residual stress has a significant effect for improving engineering properties for metals .Most of the surface treatments produce compressive residual stress at the metal surfaces, which reduce crack initiation and increasing the metal resistance to fatigue, which is shot peening process. Shot peening is usually used for this purpose for producing plastic deformations of surface of the metal which can lead to creation high residual compressive stresses at metal surface .This research include study the influence of shot peening process on fatigue resistance, surface hardness and surface roughness for low carbon steel (AISI 1008). This process accomplished with different times which were (10, 20 and 30(minutes. The result of the fatigue test showed that the fatigue limit increase when shot peening time increased and the best fatigue limit obtained when shot peening process was carried out at 30 minutes. Results of hardness test showed that surface hardness increased with increase of shot peening time. It can be seen that highest value of surface hardness is obtained from shot peening process at time (30 minutes) which is (235.1 HVN). Results of surface roughness test showed that the surface roughness of metal increased when time of shot peening increased.

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10

Lambert, Y., e J. Dhers. "Fatigue-corrosion des rouleaux de coulée continue". Revue de Métallurgie 87, n. 5 (maggio 1990): 491–99. http://dx.doi.org/10.1051/metal/199087050491.

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11

Dahl, W., e R. Hubo. "Behaviour of steel structures : fatigue and failure". Revue de Métallurgie 88, n. 6 (giugno 1991): 565–74. http://dx.doi.org/10.1051/metal/199188060565.

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12

Bruls, A. "Les ponts en acier et la fatigue". Revue de Métallurgie 88, n. 6 (giugno 1991): 575–87. http://dx.doi.org/10.1051/metal/199188060575.

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13

Lindley, T., e A. Pineau. "Short crack effects in fracture and fatigue". Revue de Métallurgie 92, n. 2 (febbraio 1995): 187–202. http://dx.doi.org/10.1051/metal/199592020187.

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14

Wang, Q. Y., C. Bathias, S. Rathery e J. Y. Bérard. "Comportement en fatigue gigacyclique d’une fonte GS". Revue de Métallurgie 96, n. 2 (febbraio 1999): 221–26. http://dx.doi.org/10.1051/metal/199996020221.

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15

Genet, G., P. Johannesson, Mac Lan Nguyen-Tajan, D. Gualandris e J. de Maré. "Multi-input Markov chain equivalent fatigue loadings". Revue de Métallurgie 106, n. 5 (maggio 2009): 220–24. http://dx.doi.org/10.1051/metal/2009037.

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16

Charkaluk, Eric, e André Galtier. "Mesures et suivi de l’endommagement en fatigue". Revue de Métallurgie 107, n. 1 (gennaio 2010): 1. http://dx.doi.org/10.1051/metal/2010011.

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17

Magnin, T. "Mechanisms of corrosion-fatigue of metallic alloys". Revue de Métallurgie 99, n. 5 (maggio 2002): 423–32. http://dx.doi.org/10.1051/metal:2002161.

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18

HIRANO, Kazumi. "Fatigue of Metal Matrix Composites." Journal of the Society of Materials Science, Japan 43, n. 493 (1994): 1373–78. http://dx.doi.org/10.2472/jsms.43.1373.

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19

Shanyavsky, A. A. "Scales of metal fatigue cracking". Physical Mesomechanics 18, n. 2 (aprile 2015): 163–73. http://dx.doi.org/10.1134/s1029959915020095.

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20

Shanyavskiy, A. A., e A. P. Soldatenkov. "Scales of Metal Fatigue Limit". Physical Mesomechanics 23, n. 2 (marzo 2020): 120–27. http://dx.doi.org/10.1134/s1029959920020034.

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21

Arumala, J. O. "Fatigue Strength of Metal Ties". Journal of Structural Engineering 117, n. 4 (aprile 1991): 1296–301. http://dx.doi.org/10.1061/(asce)0733-9445(1991)117:4(1296).

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22

Lawson, L., E. Y. Chen e M. Meshii. "Microstructural fracture in metal fatigue". International Journal of Fatigue 19, n. 93 (giugno 1997): 61–67. http://dx.doi.org/10.1016/s0142-1123(97)90037-2.

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23

Guagliano, Mario, e Laura Vergani. "Fracture Mechanics & Metal Fatigue". Theoretical and Applied Fracture Mechanics 82 (aprile 2016): 1. http://dx.doi.org/10.1016/j.tafmec.2016.01.011.

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24

Aliabadi, M. H. "Fundamentals of metal fatigue analysis". Engineering Analysis with Boundary Elements 9, n. 3 (gennaio 1992): 280. http://dx.doi.org/10.1016/0955-7997(92)90114-m.

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25

Spronk, S. W. F., I. Şen e R. C. Alderliesten. "Predicting fatigue crack initiation in fibre metal laminates based on metal fatigue test data". International Journal of Fatigue 70 (gennaio 2015): 428–39. http://dx.doi.org/10.1016/j.ijfatigue.2014.07.004.

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26

Weber, B., A. Carmet e J. L. Robert. "Prévision de l’orientation du plan d’amorçage en fatigue à l’aide d’un critère multiaxial de fatigue de type plan critique". Revue de Métallurgie 97, n. 6 (giugno 2000): 815–24. http://dx.doi.org/10.1051/metal/200097060815.

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27

Hénaff, G. "Introduction to “ Fatigue et environnement ”, the topic of the 19th “ Journées de Printemps ” of the Fatigue Commission of SF2M". Revue de Métallurgie 99, n. 5 (maggio 2002): 391–94. http://dx.doi.org/10.1051/metal:2002157.

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28

Shi, Zi Hai, Masaaki Nakano e Cui Ping Liu. "Experimental Study on the Multistage Strength Degradation and the Associated Strain Energy Variation of S25C". Advanced Materials Research 891-892 (marzo 2014): 753–58. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.753.

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The multistage strength degradation theory, which has recently emerged from studies on the material and structural behaviour of concrete, provides a clear description of the mechanism of fatigue. According to this theory, fatigue is caused by the sporadic sudden change of cracking behaviour in a system under cyclic loading, leading to intermittent strength reduction of the system and its eventual failure. As metal is the main engineering material plagued most by fatigue failure, this newly-established theory needs to be experimentally verified on metal, which is the aim of this study. The obtained test results present strong experimental evidence for the existence of multistage strength degradation processes in metals under cyclic loading, and the strength degradation is clearly triggered by the abrupt change of cracking behaviour. These tests confirm the relevance of the multistage strength degradation theory on metal fatigue, and the engineering implications of the study are discussed.

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29

Di Fant-Jaeckels, H., e A. Galtier. "Fatigue lifetime prediction model for spot welded structures". Revue de Métallurgie 97, n. 1 (gennaio 2000): 83–96. http://dx.doi.org/10.1051/metal/200097010083.

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30

Lieurade, H. P. "A critical review of corrosion-fatigue test methods". Revue de Métallurgie 99, n. 5 (maggio 2002): 411–22. http://dx.doi.org/10.1051/metal:2002160.

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31

Cao, Feng Li, Hong Bai Bai, Jian Chun Yang e Guo Quan Ren. "Analysis on Fatigue Damage of Metal Rubber Vibration Isolator". Advanced Materials Research 490-495 (marzo 2012): 162–65. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.162.

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The fatigue damage test of metal rubber vibration isolator is performed, the result of which shows that fatigue damage performance of metal rubber is different from conventional solid materials. The damage of metal rubber which is accumulated with its inner partial broken and wore wires, results in deterioration of its macro-mechanical characteristic, macro-cracking and final fatigue failure, so it does not rupture as sudden failure of solid material. It is difficult to describe damage evolution of metal rubber in the microscopic perspective, and from a macro point of view, it is feasible method to describe degree of fatigue damage which bases on the changes of mechanical properties. In order to reflect the incremental cumulative damage degree of metal rubber, the stiffness damage and damping damage are used to accurately describe the fatigue damage process of metal robber, and the comprehensive damage factor is proposed to be the fatigue failure criterion. Damage factor can predict fatigue life of metal rubber specimen accurately, so it has reference significance to design of metal rubber

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32

Guo, Ting Liang, e Zhao Xing Han. "Repairing Surface Fatigue Damage of the Metal Material by Heat Treatment". Advanced Materials Research 154-155 (ottobre 2010): 425–28. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.425.

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In this paper, using experimental method studied to repair surface fatigue damage of the metal material by heat treatment. Analyzed the mechanism to repair surface fatigue damage of the metal material by heat treatment. From the test, it have been found that the Metal materials has temping threshold behavior in repairing it’s fatigue damage by heat treatment. For the same kind of material, there is a threshold characteristics in choosing tempering temperatures when repaired the fatigue damage of metal material surface through changed tempering temperatures. Experimental results shows that the temping temperature threshold to repair metal material fatigue damage is the first tempering temperature after materials was hardened before it was in fatigue damage.

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33

Zhang, G. P., C. A. Volkert, R. Schwaiger, R. Mönig e O. Kraft. "Fatigue and thermal fatigue damage analysis of thin metal films". Microelectronics Reliability 47, n. 12 (dicembre 2007): 2007–13. http://dx.doi.org/10.1016/j.microrel.2007.04.005.

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34

Qu, Weilian, Ernian Zhao e Qiang Zhou. "Multiaxial Cycle Deformation and Low-Cycle Fatigue Behavior of Mild Carbon Steel and Related Welded-Metal Specimen". Advances in Materials Science and Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/8987376.

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The low-cycle fatigue experiments of mild carbon Q235B steel and its related welded-metal specimens are performed under uniaxial, in-phase, and 90° out-of-phase loading conditions. Significant additional cyclic hardening for 90° out-of-phase loading conditions is observed for both base metal and its related weldment. Besides, welding process produces extra additional hardening under the same loading conditions compared with the base metal. Multiaxial low-cycle fatigue strength under 90° out-of-phase loading conditions is significantly reduced for both base-metal and welded-metal specimens. The weldment has lower fatigue life than the base metal under the given loading conditions, and the fatigue life reduction of weldment increases with the increasing strain amplitude. The KBM, FS, and MKBM critical plane parameters are evaluated for the fatigue data obtained. The FS and MKBM parameters are found to show better correlation with fatigue lives for both base-metal and welded-metal specimens.

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35

Ki, Ho, C. S. Kim, Y. C. Jeon e S. I. Kwun. "Fatigue Crack Growth Characteristics in Dissimilar Weld Metal Joint". Materials Science Forum 580-582 (giugno 2008): 593–96. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.593.

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The fatigue crack growth (FCG) in dissimilar weld metal joints between SA 508 Cl.3 low-alloy steel and AISI 316L stainless steel (SS) was investigated. The dissimilar weld metal joint was made after buttering alloy 82 on the SA 508 Cl.3 side by gas tungsten arc welding (GTAW). Alloy 82 welding consumable was selected to join these two metals. The fatigue crack growth rate (FCGR) in each material in the dissimilar weld metal joint increased in the order: weldment, AISI 316L SS and SA 508 Cl.3, at the same stress intensity factor range, /K. As the crack propagated across the AISI 316L SS and heat affected zone (HAZ) into the weldment or across the SA 508 Cl.3 and HAZ, into the weldment, the FCGR in the HAZ region did not change or decrease, in spite of the increase in /K. The retardation in the FCGR in the HAZ region was discussed in terms of the welding residual stress.

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36

Yan, Hong Juan, Chun Guang Xu, Qi Lin e Hai Chao Cai. "Metal Surface Fatigue Detection Using Nonlinear Ultrasonic". Applied Mechanics and Materials 510 (febbraio 2014): 156–62. http://dx.doi.org/10.4028/www.scientific.net/amm.510.156.

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Based on theory of ultrasonic nondestructive testing on surface fatigue damage of metal components, the wave law of ultrasonic nonlinearity caused by fatigue is studied. When there are lattice defects in metal material, second-order nonlinear coefficient β changes during ultrasonic propagation. According to the point, the system of nonlinear ultrasonic testing is build. The change trends of harmonic amplitudes and ultrasonic coefficients are measured during fatigue bending testing of materials such as 45 steel, 2024 aluminum alloy and 304 stainless steel. The results shows: in elastic phase, the ratios of harmonic and fundamental waves monotonically increase with fatigue life, and in plastic phase, deformations appear and micro-cracks expand into macro-cracks in materials, the ratios firstly decrease and then increase with fatigue life. However the quadratic sums of nonlinear coefficient are approximately linear with the fatigue life. Therefore, when the relationship between the quadratic sums and fatigue life is known, it can be used to characterize fatigue state of metal materials.

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37

Abbasi, Kaveh, Mojtaba Vakili-Azghandi e Ali Shirazi. "Influence of process temperature on fatigue crack growth rate of copper in equal channel angular pressing". Metallurgical Research & Technology 118, n. 5 (2021): 505. http://dx.doi.org/10.1051/metal/2021062.

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The mechanical properties including Vickers hardness, tensile properties and fatigue crack growth rate and also, the microstructure of pure copper severely deformed by the ECAP in different temperatures, were studied in the present work. The equal channel angular pressing (ECAP) is a process applied to make fine grains microstructure. On the other hand, high temperature provides an opportunity for recrystallization of materials and reduces required force for ECAP at the same time. In this paper we have tried to find optimized temperature to perform ECAP effectively and reduce required force. The results indicated that the grains size can reduce from 18.2 to 2.7 µm by ECAP process. This study shows that because of the recrystallization phenomenon and reducing the effect of stress concentration and increasing the number of grain boundaries, the fatigue crack growth rate can decrease significantly. Also, it was found that the major improvement in tensile properties in all the temperature conditions and due to the applied simple shear to the copper, all the ECAPed specimens have demonstrated an enhanced hardness and resistance to fatigue crack growth. Although, these improvements decrease when the temperature increases. Finally, the SEM images of the fatigue fraction sections revealed three areas including, crack initiation, stable crack growth, and final fracture zone. It seems that the final fracture appeared to be a ductile fracture in the ECAP copper sample.

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38

Hasani Monfared, Banan, e Alireza Sedaghat. "Experimental investigation of impact damage on repetitive loading tolerance in metal-fiber multilayers". International Journal of Engineering & Technology 8, n. 4 (10 novembre 2019): 527. http://dx.doi.org/10.14419/ijet.v8i4.28763.

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Fiber is not sensitive to fatigue in some fiber-metal multilayers. They leave a large part of the load through the cracks and prevent the crack from opening. Due to this prevention, the opening in GLARE is less than that of the metals. Unlike what is observed in metals, concentration factor of crack tip is not fully influenced by increase in crack length. Hence, this study uses the experimental method to examine post-impact fatigue behavior of glass fiber-reinforced metal composites, known as GLARE. The GLARE made in this study was produced by autoclave in three types of GLARE 1.2-3, GLARE 1.2-4 and GLARE 3.2-5 and was exposed to impact test by different forces and then fatigue test with different cycles. The results were studied. The results showed that the first GLARE 1.2-3 specimen was completely pierced after the impact test. The second GLARE 1.2-3 specimen produced fatigue cracks from impact dent in the only aluminum impacted layer. These cracks were then amplified to the edge of the specimen. Both GLARE 1.2-4 specimens showed approximately equal fatigue life. The first GLARE 1.2-4 specimen failed near the radius due to the disturbing cracks in a way that is common in FML specimen. Moreover, both GLARE 1.2-4 specimens exhibited cracking in both aluminum layers. In 1.2-5 GLARE, both specimens showed a decrease in fatigue life and increase in impact energy.

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Li, Yu Ming, Hong Bai Bai e Jian Chun Yang. "Fatigue Damage Character of Metal Rubber Material". Advanced Materials Research 457-458 (gennaio 2012): 1159–62. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.1159.

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The damaging variable was defined firstly, mean while the fatigue character of metal rubber was discussed. Then the relationship between damaging variable and cyclic loading times had been summarized through fatigue tests. Finally observed the pattern of fracture face, cavities and flaws of the fatigue wires inner the metal rubber components with electronic scanning microscope, some technical methods of improving the wearing resistivity of metal rubber material had been brought forward.

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40

Jin, You-lin, Song-lin Du e Chao-jie Zhang. "Influence mechanism of large inclusion on wheel fatigue crack". Metallurgical Research & Technology 118, n. 5 (2021): 508. http://dx.doi.org/10.1051/metal/2021068.

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In this paper, the formation mechanism of wheel rim crack and control technique was investigated. Feature of wheel rim crack and aggregated attachments on the inner wall of nozzle were examined through scanning electron microscope and energy dispersive spectrometer. Metal rheological test of round billet rolling was conducted to investigate the corresponding location of large inclusions in the round billet and in the wheel. It was found that the rim crack of wheels during service is caused by large inclusions that originated from the aggregated inclusions on the inner wall of the nozzle. According to Murakami’s modelling, the critical size of the inclusions that initiate cracks relates to the depth from the tread. The critical sizes of the inclusions for cracks initiation at 10 mm, 14 mm, 16 mm and 20 mm below the tread are about 0.1 mm, 0.2 mm, 0.5 mm and 1.5 mm, respectively. Process optimization was made with combination of a series methods. Dispersed annular venting stopper was adopted to block the aggregation and attachment of inclusions on the inner wall of nozzle. Current and frequency of electromagnetic stirring in mold were increased to restrain the impact depth of molten steel flow and inclusions. Cooling intensity of the secondary cooling was decreased to reduce the probability of inclusions captured at the solidification front. After optimization, the number of large inclusions was greatly reduced by more than 80%, and the number of inclusions larger than 1 mm is greatly reduced from 35% to 8%. The risk of wheel rim cracks occurrence could be reduced greatly.

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Demulsant, X., e J. Mendez. "Facteurs microstructuraux gouvernant l’endommagement en fatigue d’alliages de titane." Revue de Métallurgie 91, n. 9 (settembre 1994): 1336. http://dx.doi.org/10.1051/metal/199491091336.

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42

Tao, H., e C. Bathias. "Etude expérimentale du fretting-fatigue à très haute fréquence". Revue de Métallurgie 93, n. 5 (maggio 1996): 687–96. http://dx.doi.org/10.1051/metal/199693050687.

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43

Hénaff, G. "Influence of a gaseous atmosphere on fatigue crack propagation". Revue de Métallurgie 99, n. 5 (maggio 2002): 449–65. http://dx.doi.org/10.1051/metal:2002164.

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44

Santacreu, P. O., L. Bucher, A. Koster e L. Remy. "Thermomechanical fatigue of stainless steels for automotive exhaust systems". Revue de Métallurgie 103, n. 1 (gennaio 2006): 37–42. http://dx.doi.org/10.1051/metal:2006102.

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45

He, Chao, Yong Jie Liu e Qing Yuan Wang. "Very High Cycle Fatigue Properties of Welded Joints under High Frequency Loading". Advanced Materials Research 647 (gennaio 2013): 817–21. http://dx.doi.org/10.4028/www.scientific.net/amr.647.817.

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Abstract (sommario):

Very high cycle fatigue (VHCF) properties of welded joints under ultrasonic fatigue loading have been investigated for titanium alloy (TI-6Al-4V) and bridge steel (Q345). Ultrasonic fatigue tests of base metal and welded joints were carried out in ambient air at room temperature at a stress ratio R=-1. It was observed that the fatigue strength of welded joints reduced by 50-60% as compared to the base metal. The S-N fatigue curves in the range of 107~109 cycles of base metal and welded joints for both materials exhibited the characteristic of continually decreasing type. The fatigue failure still occurred after 107 cycles of loading, and the fatigue limit in traditional does not exist. The fatigue facture mainly located in the weld metal region at low cycle fatigue range, but in the fusion area in HCF and VHCF. Analysis of fracture surfaces analyzed by SEM revealed that the fatigue cracks initiated from welding defects such as pores, cracks and inclusions.

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46

Lee, Ho Jin, Maan Won Kim e Bong Sang Lee. "Fatigue Crack Propagation Behavior Near Fusion Line between SA508 Steel and Ni-Based Buttering Metal". Key Engineering Materials 353-358 (settembre 2007): 154–57. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.154.

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Fatigue crack propagation behavior near the fusion line between SA508 ferritic steel and Ni-based buttering metal was studied to assess the integrity of dissimilar metal welded zone in reactor pressure vessels. Ni-based filler metal has been used as a buttering or filler metal to weld the ferritic steel to the Ni-alloy or austenitic stainless steel. The J integral value and stress field at the crack tip in a simulated small-CT welded specimen model was calculated by using the commercial FE calculation code to anticipate the effect of the yield strength differences between dissimilar metals. If the Ni-based buttering metal has lower yield strength, which means the decrease of material constraint by the weld metal, the J integral value of the crack tip in the base metal near the fusion line was calculated higher than that of the base metal. The fatigue crack propagation behavior near the fusion line was measured by using the small-CT welded specimens of 5 mm thickness. The relationships between da/dN and )K were measured in the base metal and the HAZ near fusion line. The yield strength of the weld metal including microstructure at the joint can be considered more effective than the material constraint on explaining the behavior of fatigue crack propagation near the fusion line.

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47

Miller, K. J. "Metal Fatigue—Past, Current and Future". Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, n. 5 (settembre 1991): 291–304. http://dx.doi.org/10.1243/pime_proc_1991_205_124_02.

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Abstract (sommario):

Metal fatigue has been a problem for more than 150 years, but because of rapid developments in fracture mechanics analyses, possibly at the expense of the traditional approach based on cyclic deformation processes, afar better understanding of fatigue failure behaviour has recently been achieved. Consequently the engineer now has the basic tools at his/her disposal to make good assessments of the numerous factors that control the fatigue lifetime of engineering materials, components and structures. Additionally, more intensive interdisciplinary research studies involving chemists, materials scientists, mathematicians and physicists—but engineering led—have generated both greater insights into long-known industrial problems and routes to required solutions. This paper traces the growth of recent developments in understanding metal fatigue from the days of our mentors to the present day, and concludes with a brief review of some future research areas that are now available for exploitation.

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48

Cieśla, M., G. Junak e A. Marek. "Fatigue Characteristics of Selected Light Metal Alloys". Archives of Metallurgy and Materials 61, n. 1 (1 marzo 2016): 271–74. http://dx.doi.org/10.1515/amm-2016-0051.

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The paper addresses results of fatigue testing of light metal alloys used in the automotive as well as aerospace and aviation industries, among others. The material subject to testing comprised hot-worked rods made of the AZ31 alloy, the Ti-6Al-4V two-phase titanium alloy and the 2017A (T451) aluminium alloy. Both low- and high-cycle fatigue tests were conducted at room temperature on the cycle asymmetry ratio of R=-1. The low-cycle fatigue tests were performed using the MTS-810 machine on two levels of total strain, i.e.Δεc= 1.0% and 1.2%. The high-cycle fatigue tests, on the other hand, were performed using a machine from VEB Werkstoffprufmaschinen-Leipzig under conditions of rotary bending. Based on the results thus obtained, one could develop fatigue life characteristics of the materials examined (expressed as the number of cycles until failure of sample Nf) as well as characteristics of cyclic material strain σa=f(N) under the conditions of low-cycle fatigue testing. The Ti-6Al-4V titanium alloy was found to be characterised by the highest value of fatigue life Nf, both in lowand high-cycle tests. The lowest fatigue life, on the other hand, was established for the aluminium alloys examined. Under the high-cycle fatigue tests, the life of the 2017A aluminium and the AZ31 magnesium alloy studied was determined by the value of stress amplitude σa. With the stress exceeding 150 MPa, it was the aluminium alloy which displayed higher fatigue life, whereas the magnesium alloy proved better on lower stress.

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49

MASUDA, Chitoshi. "Fatigue properties of metal matrix composites." Journal of Japan Institute of Light Metals 41, n. 8 (1991): 541–49. http://dx.doi.org/10.2464/jilm.41.541.

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50

Kobayashi, Hideo, e Takashi Kawakubo. "Fatigue - Difference between ceramics and metal." Bulletin of the Japan Institute of Metals 27, n. 10 (1988): 757–65. http://dx.doi.org/10.2320/materia1962.27.757.

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