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Journal articles on the topic 'Fatigue life of metals'

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Author: Grafiati

Published: 10 December 2022

Last updated: 19 February 2023

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1

Enomoto, Masatoshi. "Prediction of Fatigue Life for Light Metals and their Welded Metals." Materials Science Forum 794-796 (June 2014): 273–77. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.273.

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A6N01 (6005C in ISO) base metal is applied for cantilever type fatigue test over 108 cyclic number. Fatigue strength decreases over 107 and after testing, new prediction formula of fatigue life at high cycle regeion which named YENs formula is proposed for light metal and their welded joints. This formula is shown as below. Log (σa/σp) =k Log (Nf-N0)+m σa is stress amplitude, σp is proof stress k is depend on stress concentration factor Nf is fatigue life without residual stress and No is discrepancy due to residual stress. m is material constant. This formula is a hypothesis and it is required to accumulate much more fatigue data for many kind of alloys and their welded joints.

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2

Makkonen, M. "Predicting the total fatigue life in metals." International Journal of Fatigue 31, no. 7 (July 2009): 1163–75. http://dx.doi.org/10.1016/j.ijfatigue.2008.12.008.

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3

Szala, Grzegorz. "Influence of Stresses below the Fatigue Limit on Fatigue Life." Solid State Phenomena 224 (November 2014): 45–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.224.45.

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According to the performed analysis of fatigue phenomena occurring in metals, the effects of fatigue appear in the form of lines and slip bands under loading conditions producing variable stresses with values below the fatigue limit of these metals. It is commonly accepted that variable stresses with constant amplitude of values below 0.4 of the fatigue limit do not cause plastic strain in grains (lines and slip bands), thus they do not affect the fatigue life. This study is an attempt of quantitative assessment of the influence of stresses with values below the fatigue limit on fatigue life by using tests with programed two-step loading (variable-amplitude). Tests were performed with the use of C45 steel specimens.

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4

Santecchia, E., A. M. S. Hamouda, F. Musharavati, E. Zalnezhad, M. Cabibbo, M. El Mehtedi, and S. Spigarelli. "A Review on Fatigue Life Prediction Methods for Metals." Advances in Materials Science and Engineering 2016 (2016): 1–26. http://dx.doi.org/10.1155/2016/9573524.

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Metallic materials are extensively used in engineering structures and fatigue failure is one of the most common failure modes of metal structures. Fatigue phenomena occur when a material is subjected to fluctuating stresses and strains, which lead to failure due to damage accumulation. Different methods, including the Palmgren-Miner linear damage rule- (LDR-) based, multiaxial and variable amplitude loading, stochastic-based, energy-based, and continuum damage mechanics methods, forecast fatigue life. This paper reviews fatigue life prediction techniques for metallic materials. An ideal fatigue life prediction model should include the main features of those already established methods, and its implementation in simulation systems could help engineers and scientists in different applications. In conclusion, LDR-based, multiaxial and variable amplitude loading, stochastic-based, continuum damage mechanics, and energy-based methods are easy, realistic, microstructure dependent, well timed, and damage connected, respectively, for the ideal prediction model.

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5

Lowe, Terry C. "Enhancing Fatigue Properties of Nanostructured Metals and Alloys." Advanced Materials Research 29-30 (November 2007): 117–22. http://dx.doi.org/10.4028/www.scientific.net/amr.29-30.117.

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Recent research on the fatigue properties of nanostructured metals and alloys has shown that they generally possess superior high cycle fatigue performance due largely to improved resistance to crack initiation. However, this advantage is not consistent for all nanostructured metals, nor does it extend to low cycle fatigue. Since nanostructures are designed and controlled at the approximately the same size scale as the defects that influence crack initiation attention to preexisting nanoscale defects is critical for enhancing fatigue life. This paper builds on the state of knowledge of fatigue in nanostructured metals and proposes an approach to understand and improve fatigue life using existing experimental and computational methods for nanostructure design.

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6

Polák, Jaroslav, Jiří Man, and Ivo Kuběna. "The True Shape of Persistent Slip Markings in Fatigued Metals." Key Engineering Materials 592-593 (November 2013): 781–84. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.781.

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Persistent slip markings (PSMs) were experimentally studied in 316L steel fatigued to early stages of the fatigue life. High resolution SEM, combined with focused ion beam (FIB) technique and atomic force microscopy (AFM) were used to assess the true shape of PSMs in their early stage of development. General features of PSMs in fatigued metals are extrusions and intrusions. Their characteristic features were determined. They were discussed in relation with the theories of surface relief formation and fatigue crack initiation based on the formation, migration and annihilation of point defects in the bands of intensive cyclic slip - persistent slip bands (PSBs)

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7

Itoh, Y. Z., and H. Kashiwaya. "Low-Cycle Fatigue Properties of Steels and Their Weld Metals." Journal of Engineering Materials and Technology 111, no. 4 (October 1, 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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8

Soyama, Hitoshi, Michela Simoncini, and Marcello Cabibbo. "Effect of Cavitation Peening on Fatigue Properties in Friction Stir Welded Aluminum Alloy AA5754." Metals 11, no. 1 (December 30, 2020): 59. http://dx.doi.org/10.3390/met11010059.

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Friction stir welding (FSW) is an attractive solid-state joining technique for lightweight metals; however, fatigue properties of FSWed metals are lower than those of bulk metals. A novel mechanical surface treatment using cavitation impact, i.e., cavitation peening, can improve fatigue life and strength by introducing compressive residual stress into the FSWed part. To demonstrate the enhancement of fatigue properties of FSWed metal sheet by cavitation peening, aluminum alloy AA5754 sheet jointed by FSW was treated by cavitation peening using cavitating jet in air and water and tested by a plane bending fatigue test. The surface residual stress of the FSWed part was also evaluated by an X-ray diffraction method. It was concluded that the fatigue life and strength of FSWed specimen were improved by cavitation peening. Whereas the fatigue life at σa = 150 MPa of FSWed specimen was about 1/20 of the bulk sheet, cavitation peening was able to extend the fatigue life of the non-peened FSW specimen by 3.6 times by introducing compressive residual stress into the FSWed part. This is the first paper to demonstrate the improvement of fatigue properties of FSWed metallic sheet by cavitation peening.

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9

Fan, Yusong, Xiaolu Gui, Miao Liu, Xi Wang, Chun Feng, and Guhui Gao. "High-Cycle Fatigue Life and Strength Prediction for Medium-Carbon Bainitic Steels." Metals 12, no. 5 (May 17, 2022): 856. http://dx.doi.org/10.3390/met12050856.

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High-cycle fatigue (HCF) behaviors of medium-carbon bainitic steels with various inclusion sizes and microstructural features were studied using the rotating–bending fatigue test. Here, the medium-carbon bainitic steels with different melting processes were treated by three heat treatment routes incorporating bainite formation, namely bainite-based quenching plus partitioning (BQ&P), bainite austempering (BAT) and “disturbed bainite austempering, DBAT”. The interior inclusion-induced crack initiation (IICI) and noninclusion-induced crack initiation (NIICI) modes were found after fatigue failure. The fracture surface of IICI is characterized by a “fish-eye” surrounding a “fine granular area, FGA” in the vicinity of an inclusion. In contrast, a microfacet, instead of an inclusion, is found at the center of FGA for the NIICI fracture surface. The predications of fatigue strength and life were performed on the two crack initiation modes based on fracture surface analysis. The results showed that a majority of fatigue life is consumed within the FGA for both the IICI and NIICI failure modes. The fatigue strength of the NIICI-fatigued samples can be conveniently predicted via the two parameters of the hardness of the sample and the size of the microfacet.

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10

Walther, F., and Dietmar Eifler. "Hysteresis, Temperature and Resistance Measurements for the Characterization of the Cyclic Deformation Behavior of Metals." Materials Science Forum 567-568 (December 2007): 51–56. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.51.

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Mechanical stress-strain hysteresis, temperature and electrical resistance measurements were performed for the microstructure-related characterization of the fatigue behavior and for the fatigue life calculation of metals. The proceeding fatigue damage was evaluated using the change of the load-free electrical resistance, which is strongly influenced by the defect density of the individual material state. A new test procedure was applied for the fatigue assessment under random loading on the basis of cyclic deformation curves, similar to single step loading. A physically based fatigue life calculation “PHYBAL” was developed, which requires only three fatigue tests for the rapid and nevertheless precise calculation of S-N (Woehler) and fatigue life curves.

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11

Savu, Virgiliu-Adrian, and Zissimos Mourelatos. "Long Life Axial Fatigue Strength Models for Ferrous Powder Metals." SAE International Journal of Materials and Manufacturing 11, no. 4 (April 3, 2018): 467–79. http://dx.doi.org/10.4271/2018-01-1395.

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12

LIU, Y., and S. MAHADEVAN. "Multiaxial high-cycle fatigue criterion and life prediction for metals." International Journal of Fatigue 27, no. 7 (July 2005): 790–800. http://dx.doi.org/10.1016/j.ijfatigue.2005.01.003.

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13

Liakat, M., M. Naderi, M. M. Khonsari, and O. M. Kabir. "Nondestructive Testing and Prediction of Remaining Fatigue Life of Metals." Journal of Nondestructive Evaluation 33, no. 3 (December 10, 2013): 309–16. http://dx.doi.org/10.1007/s10921-013-0214-8.

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14

You, Ziyun, Yu Fang, Xintian Liu, Tie Chen, Wenjing Li, and Yansong Wang. "Numerical method for fatigue life of plane bolted joints under thermal load." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 14 (May 14, 2020): 2041–49. http://dx.doi.org/10.1177/0954410020925599.

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In fatigue test, the fatigue life of metal components is affected by many factors, such as test temperature, stress ratio and loading frequency. In order to study the influence of temperature on fatigue life of bolted joints, thermal stress and fast coefficient are introduced. A numerical method of fatigue crack initiation life is proposed based on Manson-Coffin strain fatigue formula. The crack initiation life of 2024 aluminum alloy at different temperatures can be obtained by this method, which provides a theoretical basis for the fatigue life prediction of metals. Then, the stress severity factor SSF is introduced to calculate fatigue life of plane bolted joints. The data obtained from the model show that the crack initiation life of aluminum alloy specimen decreases significantly with test temperature rises, the same as the fatigue life of bolted joints.

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15

Barbosa, Joelton Fonseca, José AFO Correia, RCS Freire Júnior, Shun-Peng Zhu, and Abílio MP De Jesus. "Probabilistic S-N fields based on statistical distributions applied to metallic and composite materials: State of the art." Advances in Mechanical Engineering 11, no. 8 (August 2019): 168781401987039. http://dx.doi.org/10.1177/1687814019870395.

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Fatigue life prediction of materials can be modeled by deterministic relations, via mean or median S-N curve approximation. However, in engineering design, it is essential to consider the influence of fatigue life scatter using deterministic-stochastic methods to construct reliable S-N curves and determine safe operation regions. However, there are differences between metals and composites that must be considered when proposing reliable S-N curves, such as distinct fracture mechanisms, distinct ultimate strengths under tension and compression loading, and different cumulative fatigue damage mechanisms including low-cycle fatigue. This study aims at conducting a review of the models used to construct probabilistic S-N fields ( P-S-N fields) and demonstrate the methodologies applied to fit the P-S-N fields that are best suited to estimate fatigue life of the selected materials. Results indicate that the probabilistic Stüssi and Sendeckyj models were the most suitable for composite materials, while, for metals, only the probabilistic Stüssi model presented a good fitting of the experimental data, for all fatigue regimes.7

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16

Bagmutov, V. P., V. I. Vodopyanov, I. N. Zakharov, D. S. Denisevich, M. D. Romanenko, and N. G. Nazarov. "Influence of surface hardening by combined thermal force impacts on VT22 titanium alloy fatigue life and damage." Izvestiya Vuzov. Tsvetnaya Metallurgiya (Universities' Proceedings Non-Ferrous Metallurgy), no. 6 (December 16, 2020): 65–75. http://dx.doi.org/10.17073/0021-3438-2020-6-65-75.

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The study covers the influence of electromechanical surface treatment (EMT), non-abrasive ultrasonic finishing (NAUF), their complex influence with subsequent aging on the fatigue life and surface microhardness changes. Samples for research were made of VT22 transition alloy rods after standard thermomechanical treatment. EMT was carried out by sample surface rolling with a roller and applying a high density current between them. As a result, surface thermomechanical treatment was carried out with the local fast surface heating and cooling. NAUF were implemented by shock treatment with an ultrasonic emitter striking on the treated surface. This revealed 1.8 times higher fatigue life when loading by rotational bending (with amplitude of 0.5σв) for samples after NAUF in comparison with the untreated initial state together with a slight increase in microhardness (up to 16 %). EMT reduces microhardness and fatigue life by almost 20 % and 70 %, respectively. EMT + NAUF complex processing has an insignificant effect on microhardness, but it increases fatigue life by 40 % with respect to EMT. Aging at 450 °C for 5 hours increases microhardness after EMT by 30–40 % with a simultaneous increase in fatigue life by 2 times. The aging of samples subjected to EMT + NAUF revealed virtually no increase in microhardness, but increased fatigue life by almost 3 times (as compared to EMT). According to fractography results, the reduction in fatigue life after EMT is associated with a reduction in the crack initiation stage, which virtually excludes this stage of fatigue damage accumulation from the overall sample fatigue life.

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17

Okazaki, M., Y. Mutoh, and M. Yamaguchi. "Creep-Fatigue Fracture of Dissimilar Metal Electron Beam Welded Joints at Elevated Temperature." Journal of Engineering Materials and Technology 110, no. 3 (July 1, 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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18

Haghshenas, Ali, and M. M. Khonsari. "On the Recovery and Fatigue Life Extension of Stainless Steel 316 Metals by Means of Recovery Heat Treatment." Metals 10, no. 10 (September 27, 2020): 1290. http://dx.doi.org/10.3390/met10101290.

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In this paper, we propose a methodology for enhancing the fatigue life of SS316 by performing intermittent recovery heat-treatment (RHT) in the Argon environment at different temperatures. To this end, fully-reversed fatigue bending tests are conducted on the heat-treated SS316 specimens. Damping values are obtained using the impact excitation technique to assess the damage remaining in the material after each RHT and the corresponding fatigue life. Damping is also used to distinguish the three stages of the fatigue phenomenon and the onset of crack initiation. The results show that by performing intermittent RHTs, the density of dislocation is decreased substantially and fatigue life is improved. Examination of the damping results also reveals that the material becomes more brittle after the RHT due to the decrease in the density of dislocations. The fatigue life of the specimens is governed by these two phenomena.

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19

Ihara, C., and T. Misawa. "Stochastic Models Related to Fatigue Damage of Materials." Journal of Energy Resources Technology 113, no. 4 (December 1, 1991): 215–21. http://dx.doi.org/10.1115/1.2905903.

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The stochastic models for the fatigue damage phenomena are proposed. They describe the uncertainty caused by inhomogeneity of materials for fatigue crack propagation of metals and fatigue damage of carbon fiber composite (CFRP). The models are given by the stochastic differential equations derived from the randomized Paris-Erdogan’s fatigue crack propagation law and Kachonov’s equation of fatigue damage. The sample paths and life distribution of fatigue crack propagation in metals or of damage accumulation in CFRP are obtained by using the solution of the stochastic differential equation and the probability density function, respectively. These theoretical results are compared with the actual experiments—fatigue crack propagation of high tensile strength steel APFH 60 and fatigue test for a carbon eight-harness-satin/epoxy laminate—through numerical experiments.

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20

Phuc, Phan Huu. "The convergence of the corrosion-fatigue curve family and its applications in estimating the life lost of metals in fatigue experiments." Vietnam Journal of Mechanics 19, no. 4 (December 30, 1997): 48–52. http://dx.doi.org/10.15625/0866-7136/10067.

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An approach to establish the no corrosion - fatigue curve is introduced. Based on this new approach, equations that describe the heat effect and life lost when determining the fatigue strength of metals may be established, also the reliability of the traditional fatigue curve can be assessed.

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21

Sanaei, Niloofar, and Ali Fatemi. "Defect-based fatigue life prediction of L-PBF additive manufactured metals." Engineering Fracture Mechanics 244 (March 2021): 107541. http://dx.doi.org/10.1016/j.engfracmech.2021.107541.

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22

Lei, Qiang, Peng Yue, Qiang Liu, Shun Peng Zhu, and Hong Zhong Huang. "Mean Stress and Ratcheting Corrections in Fatigue Life Prediction of Metals." Applied Mechanics and Materials 853 (September 2016): 57–61. http://dx.doi.org/10.4028/www.scientific.net/amm.853.57.

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Considering the effects of mean stress, the progressive accumulation inelastic strain occurs in engineering components under the direction of mean stress, it is simply known as ratcheting. Based on the ductility exhaustion theory, a new model is proposed to account for the effects of mean stress and ratcheting on the component fatigue life. The capability and accuracy of the proposed model are compared with those of Walker, Xia-Ellyin, Goswami, GDP and Peng models. A comparison between the model prediction and tested life is found to be quite satisfactory in the cases of 9 sets of experimental data available in the literature under different loading conditions.

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23

Li Mei-Juan, Hu Hai-Yun, and Xing Xiu-San. "The relationship between fatigue life and grain size of polycrystalline metals." Acta Physica Sinica 52, no. 8 (2003): 2092. http://dx.doi.org/10.7498/aps.52.2092.

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24

Zhu, S. P., Q. Lei, and Q. Y. Wang. "Mean stress and ratcheting corrections in fatigue life prediction of metals." Fatigue & Fracture of Engineering Materials & Structures 40, no. 9 (February 21, 2017): 1343–54. http://dx.doi.org/10.1111/ffe.12569.

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25

Amiri, M., and M. M. Khonsari. "Life prediction of metals undergoing fatigue load based on temperature evolution." Materials Science and Engineering: A 527, no. 6 (March 2010): 1555–59. http://dx.doi.org/10.1016/j.msea.2009.10.025.

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26

Bao, Hongyixi, Shengchuan Wu, Zhengkai Wu, Guozheng Kang, Xin Peng, and Philip J. Withers. "A machine-learning fatigue life prediction approach of additively manufactured metals." Engineering Fracture Mechanics 242 (February 2021): 107508. http://dx.doi.org/10.1016/j.engfracmech.2020.107508.

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27

Brighenti, Roberto, Andrea Carpinteri, and Nicholas Corbari. "Damage mechanics and Paris regime in fatigue life assessment of metals." International Journal of Pressure Vessels and Piping 104 (April 2013): 57–68. http://dx.doi.org/10.1016/j.ijpvp.2013.01.005.

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28

DING, H. Z., H. MUGHRABI, and H. W. HÖPPEL. "A low-cycle fatigue life prediction model of ultrafine-grained metals." Fatigue & Fracture of Engineering Materials & Structures 25, no. 10 (September 16, 2002): 975–84. http://dx.doi.org/10.1046/j.1460-2695.2002.00564.x.

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29

Agard, Bastien, Landry Giraud, Françoise Fauvin, Jean-Christophe Roux, Pierre Monnet, and Eric Feulvarch. "Fast computation of critical planes for fatigue life analysis of metals." Comptes Rendus. Mécanique 350, G3 (November 3, 2022): 495–506. http://dx.doi.org/10.5802/crmeca.139.

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30

Hectors, Kris, and Wim De Waele. "Cumulative Damage and Life Prediction Models for High-Cycle Fatigue of Metals: A Review." Metals 11, no. 2 (January 22, 2021): 204. http://dx.doi.org/10.3390/met11020204.

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Fatigue design of engineering structures is typically based on lifetime calculation using a cumulative damage law. The linear damage rule by Miner is the universal standard for fatigue design even though numerous experimental studies have shown its deficiencies and possible non-conservative outcomes. In an effort to overcome these deficiencies, many nonlinear cumulative damage models and life prediction models have been developed since; however, none of them have found wide acceptance. This review article aims to provide a comprehensive overview of the state-of-the art in cumulative damage and lifetime prediction models for endurance based high-cycle fatigue design of metal structures.

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31

Ahmad, Hafiz Waqar, Jeong Ho Hwang, Kamran Javed, Umer Masood Chaudry, and Dong Ho Bae. "Probabilistic Fatigue Life Prediction of Dissimilar Material Weld Using Accelerated Life Method and Neural Network Approach." Computation 7, no. 1 (February 2, 2019): 10. http://dx.doi.org/10.3390/computation7010010.

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Welding alloy 617 with other metals and alloys has been receiving significant attention in the last few years. It is considered to be the benchmark for the development of economical hybrid structures to be used in different engineering applications. The differences in the physical and metallurgical properties of dissimilar materials to be welded usually result in weaker structures. Fatigue failure is one of the most common failure modes of dissimilar material welded structures. In this study, fatigue life prediction of dissimilar material weld was evaluated by the accelerated life method and artificial neural network approach (ANN). The accelerated life testing approach was evaluated for different distributions. Weibull distribution was the most appropriate distribution that fits the fatigue data very well. Acceleration of fatigue life test data was attained with 95% reliability for Weibull distribution. The probability plot verified that accelerating variables at each level were appropriate. Experimental test data and predicted fatigue life were in good agreement with each other. Two training algorithms, Bayesian regularization (BR) and Levenberg–Marquardt (LM), were employed for training ANN. The Bayesian regularization training algorithm exhibited a better performance than the Levenberg–Marquardt algorithm. The results confirmed that the assessment methods are effective for lifetime prediction of dissimilar material welded joints.

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32

Toyosada, M. "An overview of fatigue life assessment." Welding International 18, no. 4 (April 2004): 288–300. http://dx.doi.org/10.1533/wint.2004.3236.

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33

Nie, Xu Tao, Wan Hua Chen, and Yuan Xing Wang. "Numerical Simulation Study on High-Cycle Fatigue Damage for Metals." Advanced Materials Research 941-944 (June 2014): 1477–82. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.1477.

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High-cycle fatigue damage analysis and life prediction is a most crucial problem in the research field of solid mechanics. Based on the thermodynamic potentials in the framework of thermodynamics a numerical method for high-cycle fatigue damage was studied and provided by using a two-scale damage model. Furthermore, according to the “jump-in-cycles” procedure the numerical simulation of high-cycle fatigue damage was implemented in a user subroutine of ABAQUS software. Finally, a numerical simulation instance of high-cycle fatigue damage was provided and compared with a set of test data, which indicates that the numerical simulation method presented is reasonable and applicable.

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34

Goto, Masahiro, Seung Zeon Han, Yuji Yokoho, Kazuya Nakashima, S. S. Kim, and Kwang Jun Euh. "The Relationship between Shear Bands and Crack Growth Behavior in Ultrafine Grained Copper Processed by Severe Plastic Deformation." Key Engineering Materials 452-453 (November 2010): 645–48. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.645.

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Fatigue life of smooth specimens is approximately controlled by the growth life of a small crack. This means the growth behavior of small cracks must be clarified to estimate the fatigue life of plain members. However, there are few studies on the growth behavior of small cracks in ultrafine grained (UFG) metals. In the present study, fatigue tests for UFG copper have been conducted. The formation behavior of shear bands (SBs) and growth behavior of a small crack have been monitored to clarify the effect of SBs on the growth behavior of a major crack.

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35

MAKABE, CHOBIN, MD SHAFIUL FERDOUS, AKIMICHI SHIMABUKURO, and ANGGIT MURDANI. "EFFECT OF NaCl SOLUTION SPRAYING ON FATIGUE LIVES OF SMOOTH AND SLIT SPECIMENS OF 0.37% CARBON STEEL." Surface Review and Letters 24, no. 01 (December 22, 2016): 1750011. http://dx.doi.org/10.1142/s0218625x17500111.

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The fatigue crack initiation life and growth rate are affected by experimental conditions. A corrosive environment can be created in a laboratory by means of dropping salt water onto the specimen surface, spraying chloride mist into the experimental chamber, etc. In the case of smooth specimens of some metals, fatigue life is shortened and the fatigue limit disappears under such corrosive experimental conditions. In this study, the effects of intermittent spraying of 3% NaCl solution-mist on corrosion fatigue behavior were investigated. The material used was 0.37% carbon steel. This is called JIS S35C in Japan. Spraying of 3% NaCl solution-mist attacked the surface layer of the specimen. It is well known that the pitting, oxidation–reduction reaction, etc. affect the fatigue strength of metals in a corrosive environment. We carried out corrosion fatigue tests with smooth specimens, holed specimens and slit specimens. Then the effects of such specimen geometry on the fatigue strength were investigated when the NaCl solution-mist was sprayed onto the specimen surface. In the case of lower stress amplitude application in slit specimens, the fatigue life in a corrosive atmosphere was longer than that in the open air. It is discussed that the behavior is related to the crack closure which happens when the oxide builds up and clogs the crack or slit.

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36

Kobayashi, T., and K. Nihei. "Fatigue life estimation of welded structures with a fatigue damage sensor." Welding International 22, no. 4 (April 2008): 212–17. http://dx.doi.org/10.1080/09507110802117750.

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37

Muragishi, O. "Fatigue life diagnosis of steel structures with a fatigue damage sensor." Welding International 20, no. 2 (February 2006): 95–99. http://dx.doi.org/10.1533/wint.2006.3539.

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Yu, Fang, Lie Ping Ye, and Zhi Jun Dong. "A Theoretical Study on the Cables Fatigue Life Quantitative Analysis Method of Cable Bridges." Applied Mechanics and Materials 501-504 (January 2014): 1214–20. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1214.

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Based on the theory of fatigue fracture of metals, quantitative analysis method was proposed for fatigue strength of cables of cable bridges and conclusions were reached through analysis of calculation formula: the analysis method of stress fatigue life was able to consider the section dimensions of the cables, plasticity of the material and stress ration caused by external loads and other factors which affect the fatigue life. This analysis theory was correct which took into consideration of relatively overall factors and was a better way to analyze the cable fatigue life. Meanwhile, the design of fatigue strength of bridge cables should adopt the theoretical fatigue limit represented by equivalent nominal stress amplitude as the design value of fatigue strength of cable. The theory represented by equivalent nominal stress amplitude considered the influence of stress ratio on fatigue life of cables caused by external loads. Compared with traditional method of fatigue strength estimate, with sufficient theory basis and overall consideration of factors, the results of this method were more reliable.

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Quoc Huy VU, Dinh Quy VU, and Thi Tuyet Nhung LE. "Fatigue Life Prediction Under Multiaxial Variable Amplitude Loading Using A Stress-Based Criterion." International Journal of Manufacturing, Materials, and Mechanical Engineering 10, no. 1 (January 2020): 33–53. http://dx.doi.org/10.4018/ijmmme.2020010103.

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This article presents fatigue life calculations for metals under different multiaxial variable amplitude loading patterns. Developed from a stress-based multiaxial fatigue criterion, a damage parameter used in the fatigue life prediction method can capture correctly different damage mechanisms (proportional and non-proportional multiaxiality, mean stress, asynchronous and variable amplitude) of fatigue loading in the high cycle fatigue domain. The method is based on a reference S-N curve and a cumulative damage law. Assessment of the accuracy of the proposed method is carried out with three different materials from literature (EN-GS800-2 cast iron, 39NiCrMo3 steel and SAE 1045 steel) subjected to different patterns of variable amplitude loading (blocks, non-proportional asynchronous and proportional random loading). Results reveal that the prediction method is in good accordance with the experimental data.

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Farrow, IR. "Fatigue of Composite Materials under Aircraft Service Loading." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 1 (January 1996): 101–7. http://dx.doi.org/10.1243/pime_proc_1996_210_348_02.

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Fatigue damage accumulation and analysis methods are considered for composites and contrasted with metals. The failure of current analysis methods is illustrated and explained by the information missing in load idealization data. Detailed local strain operational monitoring with local strain fatigue data is proposed as a future approach to fatigue life assessment of composite materials under aircraft service loading.

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Torries, Brian, Amanda J. Sterling, Nima Shamsaei, Scott M. Thompson, and Steve R. Daniewicz. "Utilization of a microstructure sensitive fatigue model for additively manufactured Ti-6Al-4V." Rapid Prototyping Journal 22, no. 5 (August 15, 2016): 817–25. http://dx.doi.org/10.1108/rpj-11-2015-0168.

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Purpose The purpose of this study is to calibrate a microstructure-based fatigue model for its use in predicting fatigue life of additively manufactured (AM) Ti-6Al-4V. Fatigue models that are capable of better predicting the fatigue behavior of AM metals is required to further the adoption of such metals by various industries. The trustworthiness of AM metallic material is not well characterized, and fatigue models that consider unique microstructure and porosity inherent to AM parts are needed. Design/methodology/approach Various Ti-6Al-4V samples were additively manufactured using Laser Engineered Net Shaping (LENS), a direct laser deposition method. The porosity within the LENS samples, as well as their subsequent heat treatment, was varied to determine the effects of microstructure and defects on fatigue life. The as-built and heat-treated LENS samples, together with wrought Ti-6Al-4V samples, underwent fatigue testing and microstructure and fractographic inspection. The collected microstructure/defect statistics were used for calibrating a microstructure-sensitive fatigue model. Findings Fatigue lives of the LENS Ti-6Al-4V samples were found to be consistently less than those of the wrought Ti-6Al-4V samples, and this is attributed to the presence of pores/defects within the LENS material. Results further indicate that LENS Ti-6Al-4V fatigue lives, as predicted by the used microstructure-sensitive fatigue model, are in close agreement with experimental results. The used model could predict upper and lower prediction bounds based on defect statistics. All the fatigue data were found to be within the bounds predicted by the microstructure-sensitive fatigue model. Research limitations/implications To further test the utility of microstructure-sensitive fatigue models for predicting fatigue life of AM samples, future studies on additional material types, additive manufacturing processes and heat treatments should be conducted. Originality/value This study shows the utility of a microstructure-sensitive fatigue model for use in predicting the fatigue life of LENS Ti-6Al-4V with various levels of porosity and while in a heat-treated condition.

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Bruchhausen, Matthias, Gintautas Dundulis, Alec McLennan, Sergio Arrieta, Tim Austin, Román Cicero, Walter-John Chitty, et al. "Characterization of Austenitic Stainless Steels with Regard to Environmentally Assisted Fatigue in Simulated Light Water Reactor Conditions." Metals 11, no. 2 (February 10, 2021): 307. http://dx.doi.org/10.3390/met11020307.

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A substantial amount of research effort has been applied to the field of environmentally assisted fatigue (EAF) due to the requirement to account for the EAF behaviour of metals for existing and new build nuclear power plants. We present the results of the European project INcreasing Safety in NPPs by Covering Gaps in Environmental Fatigue Assessment (INCEFA-PLUS), during which the sensitivities of strain range, environment, surface roughness, mean strain and hold times, as well as their interactions on the fatigue life of austenitic steels has been characterized. The project included a test campaign, during which more than 250 fatigue tests were performed. The tests did not reveal a significant effect of mean strain or hold time on fatigue life. An empirical model describing the fatigue life as a function of strain rate, environment and surface roughness is developed. There is evidence for statistically significant interaction effects between surface roughness and the environment, as well as between surface roughness and strain range. However, their impact on fatigue life is so small that they are not practically relevant and can in most cases be neglected. Reducing the environmental impact on fatigue life by modifying the temperature or strain rate leads to an increase of the fatigue life in agreement with predictions based on NUREG/CR-6909. A limited sub-programme on the sensitivity of hold times at elevated temperature at zero force conditions and at elevated temperature did not show the beneficial effect on fatigue life found in another study.

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Venkatesh, V., R. Noraas, A. Pilchak, S. Tamirisa, K. Calvert, A. Salem, T. Broderick, M. G. Glavicic, I. Dempster, and V. Saraf. "Data Driven Tools and Methods for Microtexture Classification and Dwell Fatigue Life Prediction in Dual Phase Titanium Alloys." MATEC Web of Conferences 321 (2020): 11091. http://dx.doi.org/10.1051/matecconf/202032111091.

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Microtexture has been linked to large reductions in cold dwell fatigue (CDF) life of specific dual phase titanium alloy aeroengine components. A recently completed Metals Affordability Initiative (MAI) funded program led by Pratt & Whitney (P&W) and includes ATI Forged Products, Boeing, GE Aviation, Rolls Royce (RR), Arconic, Titanium Metals Corporation (TIMET), PCC-Wyman Gordon (PCC-WG), Scientific Forming Technologies (SFTC), Materials Resources LLC (MRL) and The Ohio State University (OSU) has developed improved techniques for the characterization of microtexured regions (MTR) in titanium billet and forgings, and integrated computational materials engineering (ICME). These methods are aimed at developing and integrating process and property modeling tools for the prediction of microtexture and fatigue life in titanium components. These characterization and fatigue life prediction tools have near-term application off ramps that will enable use for process and product development and quality control. Key results for two widely used alloys, Ti-6242 and Ti-64, will be reviewed in this paper.

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Zhang, Chunguo, Weizhen Song, Qitao Wang, and Wen Liu. "Influence of Pre-Stress Magnitude on Fatigue Crack Growth Behavior of Al-Alloy." Materials 11, no. 8 (July 24, 2018): 1267. http://dx.doi.org/10.3390/ma11081267.

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From tensile overload to shot peening, there have been many attempts to extend the fatigue properties of metals. A key challenge with the cold work processes is that it is hard to avoid generation of harmful effects (e.g., the increase of surface roughness caused by shot peening). Pre-stress has a positive effect on improving the fatigue property of metals, and it is expected to strength Al-alloy without introducing adverse factors. Four pre-stresses ranged from 120 to 183 MPa were incorporated in four cracked extended-compact tension specimens by application of different load based on the measured stress–strain curve. Fatigue crack growth behavior and fractured characteristic of the pre-stressed specimens were investigated systematically and were compared with those of an as-received specimen. The results show that the pre-stress ranged from 120 to 183 MPa significantly improved the fatigue resistance of Al-alloy by comparison with that of the as-received specimen. With increasing pre-stress, the fatigue life first increases, then decrease, and the specimen with pre-stress of 158 MPa has the longest fatigue life. For the manner of pre-stress, no adverse factor was observed for increasing fatigue property, and the induced pre-stress reduced gradually till to disappear during subsequent fatigue cycling.

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Chen, Wufan, and Haofei Zhou. "Modeling for Cyclic Plasticity of Gradient Nanostructured Metals and Fatigue Life Prediction." International Journal of Applied Mechanics 13, no. 02 (March 2021): 2150021. http://dx.doi.org/10.1142/s1758825121500216.

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This paper proposes a theoretical model for the description of tension-compression cyclic plasticity of gradient nanostructured (GNS) metals. The gradient grain size effect is considered by introducing the Hall–Petch relation for local yield stress and strain hardening. With the experimentally measured grain size distribution profile, the average axial stress can be calculated for cylindrical GNS metal specimens. The model was verified using experimental data obtained from 316L stainless steel treated by surface mechanical rolling treatment (SMRT). Moreover, the corresponding strain energy for cyclic plasticity can be calculated from the constitutive equations, providing an energy-based approach to explain the fatigue life of gradient 316L stainless steel.

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Zhu, Shun‐Peng, Yong‐Zhen Hao, José A. F. Oliveira Correia, Grzegorz Lesiuk, and Abílio M. P. Jesus. "Nonlinear fatigue damage accumulation and life prediction of metals: A comparative study." Fatigue & Fracture of Engineering Materials & Structures 42, no. 6 (November 11, 2018): 1271–82. http://dx.doi.org/10.1111/ffe.12937.

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Al-Obaid, Y. F. "A Rudimentary Analysis of Improving Fatigue Life of Metals by Shot-Peening." Journal of Applied Mechanics 57, no. 2 (June 1, 1990): 307–12. http://dx.doi.org/10.1115/1.2891990.

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In this paper, a rudimentary analysis of improving fatigue life of metals is presented. The process is viewed as one of repeated impact of a stream of hard shots on to a target. The model considers first a single shot impinging upon a target and, on bouncing, it leaves a residual stress below the surface of the target. The problem is then generalized to consider the effect of a stream of shots by assuming their effect to be uniformly distributed over the entire surface. The analysis is highly simplified and it mainly aims at understanding the mechanics of this complicated process. Although rudimentary, the theoretical analysis is seen to be in reasonable agreement with experimental results performed with shots on targets of various materials.

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Li, Jing, Yuan-ying Qiu, Chun-wang Li, and Zhong-ping Zhang. "Fatigue life prediction for metals using an improved strain energy density model." Mechanics of Advanced Materials and Structures 27, no. 7 (March 23, 2019): 579–85. http://dx.doi.org/10.1080/15376494.2018.1487610.

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Shi, Laixin, Lin Xiang, Jianquan Tao, Jun Liu, Qiang Chen, and Yong Zhong. "Effects of Actual Marine Atmospheric Pre-Corrosion and Pre-Fatigue on the Fatigue Property of 7085 Aluminum Alloy." Metals 12, no. 1 (January 4, 2022): 81. http://dx.doi.org/10.3390/met12010081.

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Effects of actual marine atmospheric precorrosion and prefatigue on the fatigue property of 7085-T7452 aluminum alloy were investigated by using the methods of marine atmospheric outdoor exposure tests and constant amplitude axial fatigue tests. Marine atmospheric corrosion morphologies, fatigue life, and fatigue fractography were analyzed. After three months of outdoor exposure, both pitting corrosion and intergranular corrosion (IGC) occurred, while the latter was the dominant marine atmospheric corrosion mode. Marine atmospheric precorrosion could result in a dramatical decrease in the fatigue life of the as-received 7085-T7452 aluminum alloy, while selective prefatigue can improve the total fatigue life of the precorroded specimen. The mechanism of the actual marine atmospheric corrosion and its effects on the fatigue life of the 7085-T7452 aluminum alloy were also discussed.

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Song, Yang, Zhe Zhang, Hantuo Ma, Masashi Nakatani, Mie Ota Kawabata, and Kei Ameyama. "Ratcheting-Fatigue Behavior of Harmonic-Structure-Designed SUS316L Stainless Steel." Metals 11, no. 3 (March 13, 2021): 477. http://dx.doi.org/10.3390/met11030477.

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Stainless steels with harmonic-structure design have a great balance of high strength and high ductility. Therefore, it is imperative to investigate their fatigue properties for engineering applications. In the present work, the harmonic-structured SUS316L stainless steels were fabricated by mechanical milling (MM) and subsequent hot isostatic pressing (HIP) process. A series of ratcheting-fatigue tests were performed on the harmonic-structured SUS316L steels under stress-control mode at room temperature. Effects of grain structure and stress-loading conditions on ratcheting behavior and fatigue life were investigated. Results showed that grain size and applied mean stress had a significant influence on ratcheting-strain accumulation and fatigue life. Owing to the ultrafine grained structure, tensile strength of the harmonic-structured SUS316L steels could be enhanced, which restrained the ratcheting-strain accumulation, resulting in a prolonged fatigue life. A higher mean stress caused a faster ratcheting-strain accumulation, which led to the deterioration of fatigue life. Moreover, a modified model based on Smith–Watson–Topper (SWT) criterion predicted the ratcheting-fatigue life of the harmonic-structured SUS316L steels well. Most of the fatigue-life points were located in the 5 times error band.

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