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Journal articles on the topic 'Environment-assisted fatigue'

Author: Grafiati

Published: 11 March 2023

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1

Wu, X. J., and W. Wallace. "On low-temperature environment-assisted fatigue crack propagation." Metallurgical and Materials Transactions A 25, no. 3 (1994): 658–59. http://dx.doi.org/10.1007/bf02651611.

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2

Sandviknes, J. S. S., N. D. Adasooriya, D. Pavlou, and T. Hemmingsen. "Environment-assisted fatigue of steel bridges: A conceptual framework for life assessment." IOP Conference Series: Materials Science and Engineering 1201, no. 1 (2021): 012045. http://dx.doi.org/10.1088/1757-899x/1201/1/012045.

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Abstract This paper presents a framework based on a recently proposed fatigue strength curve of corroded steel to assess the life of an existing steel bridge exposed to environment-assisted fatigue. Environment-assisted cracking (EAC) and how it affects the structural integrity of steel bridges are introduced by the framework. Determination of both corroded and uncorroded details in a corrosive environment are also included in this framework. To conform the applicability and significance, a fatigue life of a railway bridge was assessed by methods given in the framework. The obtained fatigue li

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3

Zelizko, V., A. Grossmuller, and M. V. Swain. "Environment Assisted Fatigue Crack Growth Behaviour of Mg-PSZ." Materials Science Forum 34-36 (January 1991): 201–5. http://dx.doi.org/10.4028/www.scientific.net/msf.34-36.201.

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4

Shen, R., Y. B. He, and M. Cao. "Research on the Environment Assisted Fatigue Based on Flaw Tolerance Method." Procedia Engineering 130 (2015): 1580–91. http://dx.doi.org/10.1016/j.proeng.2015.12.329.

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5

Gu, Kyoung Hee, Ki Sik Lee, Gum Hwa Lee, and Ki Woo Nam. "Evaluation of Fatigue Life of Ultra-High-Strength Steel under Stress Corrosion Environment." Applied Mechanics and Materials 907 (June 22, 2022): 1–7. http://dx.doi.org/10.4028/p-s303xf.

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Ultra-high-strength steel (UHSS) structures are exposed to corrosive environments during service, and hydrogen-assisted cracking (HAC) may occur owing to stress corrosion cracking and hydrogen embrittlement. In this study, the HAC threshold stress intensity factor and fatigue life of UHSS steel were evaluated by applying stress in a corrosive environment to prevent structural fracture. For specimen with semicircular slits by electric discharge machining, fatigue limit was obtained by static fatigue test under corrosive environment. The fatigue limit of the crack specimen was evaluated by the f

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6

Bruchhausen, Matthias, Gintautas Dundulis, Alec McLennan, et al. "Characterization of Austenitic Stainless Steels with Regard to Environmentally Assisted Fatigue in Simulated Light Water Reactor Conditions." Metals 11, no. 2 (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 c

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Chen, Xingyang, Linlin Ma, Haoping Xie, Fengting Zhao, Yufeng Ye, and Lin Zhang. "Effects of external hydrogen on hydrogen-assisted crack initiation in type 304 stainless steel." Anti-Corrosion Methods and Materials 67, no. 3 (2020): 331–35. http://dx.doi.org/10.1108/acmm-02-2020-2258.

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Purpose The purpose of this paper is to present a crack initiation mechanism of the external hydrogen effect on type 304 stainless steel, as well as on fatigue crack propagation in the presence of hydrogen gas. Design/methodology/approach The effects of external hydrogen on hydrogen-assisted crack initiation in type 304 stainless steel were discussed by performing fatigue crack growth rate and fatigue life tests in 5 MPa argon and hydrogen. Findings Hydrogen can reduce the incubation period of fatigue crack initiation of smooth fatigue specimens and greatly promote the fatigue crack growth rat

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8

FUKUTA, Yuichi, Hiroshi KANASAKI, Seiji ASADA, and Toshiya SARUWATARI. "OS0803 Refinement of Strain Rate that Shows No Environment Assisted Fatigue for Austenitic Stainless Steels in PWR Environment." Proceedings of the Materials and Mechanics Conference 2012 (2012): _OS0803–1_—_OS0803–3_. http://dx.doi.org/10.1299/jsmemm.2012._os0803-1_.

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9

Octavia, Johanna Renny, Peter Feys, and Karin Coninx. "Development of Activity-Related Muscle Fatigue during Robot-Mediated Upper Limb Rehabilitation Training in Persons with Multiple Sclerosis: A Pilot Trial." Multiple Sclerosis International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/650431.

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Robot-assisted rehabilitation facilitates high-intensity training of the impaired upper limb in neurological rehabilitation. It has been clinically observed that persons with Multiple Sclerosis (MS) have difficulties in sustaining the training intensity during a session due to the development of activity-related muscle fatigue. An experimental observational pilot study was conducted to examine whether or not the muscle fatigue develops in MS patients during one session of robot-assisted training within a virtual learning environment. Six MS patients with upper limb impairment (motricity index

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10

Poulain, Thibault, Laurent de Baglion, Jose Mendez, and Gilbert Hénaff. "Influence of Strain Rate and Waveshape on Environmentally-Assisted Cracking during Low-Cycle Fatigue of a 304L Austenitic Stainless Steel in a PWR Water Environment." Metals 9, no. 2 (2019): 197. http://dx.doi.org/10.3390/met9020197.

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In this paper, the low cycle fatigue resistance of a 304L austenitic stainless steel in a simulated pressurized water reactor (PWR) primary water environment has been investigated by paying a special attention to the interplay between environmentally-assisted cracking mechanisms, strain rate, and loading waveshape. More precisely, one of the prime interests of this research work is related to the consideration of complex waveshape signals that are more representative of solicitations encountered by real components. A detailed analysis of stress-strain relation, surface damage, and crack growth

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11

Xing, X. Q., J. N. Lu, J. W. Jian, L. J. Li, and Z. C. Luo. "Effect of environment-assisted cracking on the premature fatigue failure of high-strength valve springs." Engineering Failure Analysis 126 (August 2021): 105466. http://dx.doi.org/10.1016/j.engfailanal.2021.105466.

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12

Cabrini, Marina, Sergio Lorenzi, Tommaso Pastore, and Fabio Maria Bolzoni. "Environmentally assisted cracking of pipeline steels in CO2 containing environment at near-neutral pH." Corrosion Reviews 35, no. 4-5 (2017): 309–23. http://dx.doi.org/10.1515/corrrev-2017-0053.

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AbstractThe paper summarizes the results obtained by authors concerning near-neutral stress corrosion cracking (SCC) phenomena on buried pipelines. Stress corrosion tests according to different methodologies and fatigue propagation tests were executed on traditional steel grades. Tests were performed also on specimens pre-corroded according to a procedure developed to produce localized attacks similar to those observed during failure analysis on pipelines, acting as preferential sites for crack nucleation. Electrochemical tests were carried out in order to evaluate the influence of environment

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13

Kasul, David B., and Lloyd A. Heldt. "Environmental Effects on the Cracking of Engineering Materials." MRS Bulletin 14, no. 8 (1989): 37–43. http://dx.doi.org/10.1557/s0883769400061947.

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A material's susceptibility to cracking may be significantly affected by its chemical environment. Stress corrosion cracking (SCC), liquid metal embrittle-ment (LME), hydrogen embrittlement (HE), and corrosion fatigue are examples of environmental effects which cause ductility or endurance losses through environment-assisted cracking (EAC). Under certain conditions, virtually all commercially important materials are susceptible to one or more of the above embrittlement processes. Cracking may occur intergranularly, transgranularly, or in a mixed mode, depending on conditions. Much is known abo

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14

Krausz, Alexander S., and Klara Krausz. "The Fracture Kinetics of Subcritical Environment Assisted Fatigue Crack Propagation Processes / Die Bruchkinetik subkritischer, umgebungsunterstützter Ermüdungsrißausbreitung." International Journal of Materials Research 81, no. 3 (1990): 181–92. http://dx.doi.org/10.1515/ijmr-1990-810304.

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15

Krausz, K., X. Wu, Z. Lian, and A. S. Krausz. "On the Constitutive Law of Environment Assisted Fatigue: The Physical Meaning ofthe Paris Type’Eguatiöns Part 1." International Journal of Materials Research 83, no. 4 (1992): 283–88. http://dx.doi.org/10.1515/ijmr-1992-830414.

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16

Gnanasekaran, Balachander, Jie Song, Vijay Vasudevan, and Yao Fu. "Corrosion Fatigue Characteristics of 316L Stainless Steel Fabricated by Laser Powder Bed Fusion." Metals 11, no. 7 (2021): 1046. http://dx.doi.org/10.3390/met11071046.

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Laser powder bed fusion (LPBF) has been increasingly used in the fabrication of dense metallic structures. However, the corrosion related properties of LPBF alloys, in particular environment-assisted cracking, such as corrosion fatigue properties, are not well understood. In this study, the corrosion and corrosion fatigue characteristics of LPBF 316L stainless steels (SS) in 3.5 wt.% NaCl solution have been investigated using an electrochemical method, high cycle fatigue, and fatigue crack propagation testing. The LPBF 316L SSs demonstrated significantly improved corrosion properties compared

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Stanzl-Tschegg, Stefanie E. "When do small fatigue cracks propagate and when are they arrested?" Corrosion Reviews 37, no. 5 (2019): 397–418. http://dx.doi.org/10.1515/corrrev-2019-0023.

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AbstractThe formation of small and long cracks and their propagation or arrest are treated drawing special attention to the (a) impact of environment and (b) several loading parameters (R-ratio, stress/strain-amplitude, constant-amplitude and variable-amplitude loading, superimposed loading, ultrasonic fatigue loading, and frequency effects) for three groups of metallic materials (two high-strength steels, 7075 and 2024 Al alloys, polycrystalline copper). The influence of these parameters on lifetimes and fatigue crack propagation behavior being determined by microstructural features on all le

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18

GAO, ZHIWEI, DONGPO WANG, BAOMING GONG, CAIYAN DENG, SHAOJIE WU, and HAI ZHANG. "VHCF Behavior of Welded Joints with HFMI Treatment under Moisture Conditions." Welding Journal 101, no. 1 (2022): 27–42. http://dx.doi.org/10.29391/2022.101.003.

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Fatigue tests of cruciform welded joints made of Q355B steel at very-high-cycle fatigue (VHCF) regimes were carried out on as-welded specimens using highfrequency mechanical impact (HFMI) treatment in dry air and water-spray environments, respectively. The influence of the environment on fatigue life was more obvious in the VHCF regime. It was found that S-N curves became flat over the range of 106–108 cycles for as-welded specimens, while a continuously decreasing S-N curve existed for HFMI-treated specimens. Fatigue cracks initiated from the weld toe of the as-welded specimens in dry air and

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19

Pinto-Bernal, Maria J., Carlos A. Cifuentes, Oscar Perdomo, Monica Rincón-Roncancio, and Marcela Múnera. "A Data-Driven Approach to Physical Fatigue Management Using Wearable Sensors to Classify Four Diagnostic Fatigue States." Sensors 21, no. 19 (2021): 6401. http://dx.doi.org/10.3390/s21196401.

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Physical exercise contributes to the success of rehabilitation programs and rehabilitation processes assisted through social robots. However, the amount and intensity of exercise needed to obtain positive results are unknown. Several considerations must be kept in mind for its implementation in rehabilitation, as monitoring of patients’ intensity, which is essential to avoid extreme fatigue conditions, may cause physical and physiological complications. The use of machine learning models has been implemented in fatigue management, but is limited in practice due to the lack of understanding of

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20

Voss, M. Lauren, J. Paige Pope, and Jennifer L. Copeland. "Reducing Sedentary Time among Older Adults in Assisted Living: Perceptions, Barriers, and Motivators." International Journal of Environmental Research and Public Health 17, no. 3 (2020): 717. http://dx.doi.org/10.3390/ijerph17030717.

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Older adults accumulate more sedentary time (ST) than any other age group, especially those in assisted living residences (ALRs). Reducing prolonged ST could help maintain function among older adults. However, to develop effective intervention strategies, it is important to understand the factors that influence sedentary behavior. The purpose of this study was to explore perceptions of ST as well as barriers and motivators to reducing ST among older adults in assisted living, in the context of the Social Ecological Model (SEM). Using a qualitative description approach, we sought to learn about

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21

Pañeda, Emilio Martínez. "Progress and opportunities in modelling environmentally assisted cracking." RILEM Technical Letters 6 (July 19, 2021): 70–77. http://dx.doi.org/10.21809/rilemtechlett.2021.145.

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Environmentally assisted cracking phenomena are widespread across the transport, defence, energy and construction sectors. However, predicting environmentally assisted fractures is a highly cross-disciplinary endeavour that requires resolving the multiple material-environment interactions taking place. In this manuscript, an overview is given of recent breakthroughs in the modelling of environmentally assisted cracking. The focus is on the opportunities created by two recent developments: phase field and multi-physics modelling. The possibilities enabled by the confluence of phase field method

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22

Kim, Ho-Sub, Hyeon Bae Lee, Junjie Chen, et al. "Effect of zinc on the environmentally-assisted fatigue behavior of 316 stainless steels in simulated PWR primary environment." Corrosion Science 151 (May 2019): 97–107. http://dx.doi.org/10.1016/j.corsci.2019.02.012.

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23

Underwood, John H., and Edward Troiano. "Critical Fracture Processes in Army Cannons: A Review." Journal of Pressure Vessel Technology 125, no. 3 (2003): 287–92. http://dx.doi.org/10.1115/1.1593075.

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Fast fracture in cannons can be well described using elastic-plastic fracture toughness, in combination with comparisons of cannon section size relative to the size required to maintain plane strain fracture. Fatigue fracture of cannon tubes is modeled from results of full-size fatigue tests that simulate cannon firing. These tests are also the basis of fatigue-intensity-factor modeling of fatigue life, which incorporates material strength, initial crack size and Bauschinger-modified autofrettage residual stress into life predictions. Environment-assisted fracture in the thermally damaged near

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24

BERGNER, F., H. BERSCH, H. WORCH, and G. ZOUHAR. "Mapping of the rate-controlling steps for environment-assisted fatigue crack growth applied to the aluminium alloy 6013 T6." International Journal of Fatigue 24, no. 8 (2002): 831–39. http://dx.doi.org/10.1016/s0142-1123(02)00002-6.

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James, L. A., T. A. Auten, T. J. Poskie, and W. H. Cullen. "Corrosion Fatigue Crack Growth in Clad Low-Alloy Steels—Part I: Medium-Sulfur Forging Steel." Journal of Pressure Vessel Technology 119, no. 3 (1997): 249–54. http://dx.doi.org/10.1115/1.2842301.

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Corrosion fatigue crack propagation tests were conducted on a medium-sulfur ASTM A508-2 forging steel overlaid with weld-deposited alloy EN82H cladding. The specimens featured semi-elliptical surface cracks penetrating approximately 6.3 mm of cladding into the underlying steel. The initial crack sizes were relatively large with surface lengths of 30.3–38.3 mm, and depths of 13.1–16.8 mm. The experiments were conducted in a quasi-stagnant low-oxygen (O2 < 10ppb) aqueous environment at 243°C, under loading conditions (ΔK, R, and cyclic frequency) conducive to environmentally assisted cracking

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26

Kariya, K., Norio Kawagoishi, H. Maeda, Q. Chen, Masahiro Goto, and Yan Nu. "Fatigue Fracture Mechanism of Extruded Al Alloy 7075-T6 in High Humidity." Key Engineering Materials 488-489 (September 2011): 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.45.

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Effect of high humidity on growth mechanism of a fatigue crack was investigated for an extruded bar of an age-hardened Al alloy 7075-T6 which had the marked texture of plane (111). Fracture in high humidity occurred by the growth of a shear mode crack under high stress levels, though a crack propagated in a tensile mode under low stress ones, macroscopically. Many voids and slip planes were observed on the fracture surface yielded by the shear mode crack. Especially most of the fracture surface was occupied by voids where the crack was small. The void percentage decreased with increasing in th

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Kishlakov, Daniel L., Pavel V. Tarakanov, Georgy V. Shashurin, and Yury V. Berchun. "Hydrogen Aggressive Media Impact on Cycling Durability of Structure Components." Materials Science Forum 844 (March 2016): 27–30. http://dx.doi.org/10.4028/www.scientific.net/msf.844.27.

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To develop modern CAE systems for durable and reliable structure components design, mathematical modeling of environmentally assisted metal cracking becomes very important. For structure components exploited in aggressive environment and under cyclic load, it is a problem of today. Besides, mathematical rule of damage accumulation of different causes (for instance, hydrogen media impact and cycling) is rarely used in CAE systems, but if such rule was used, crack propagation simulation considering several damage causes would be possible.Environmentally assisted metal cracking model (developed e

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Saxena, Ashok, and Kevin Nibur. "Fatigue Crack Growth Behaviour of High Strength Ferritic Steels in High Pressure Hydrogen." MATEC Web of Conferences 165 (2018): 03008. http://dx.doi.org/10.1051/matecconf/201816503008.

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The design of safe and low-cost, high-pressure hydrogen storage systems are a critical need for harnessing clean power but must consider the propensity of hydrogen to accelerate fatigue crack growth rates in the construction materials. Design of safe pressure vessels needs robust models for predicting crack growth rates and how they are affected by variables such as loading frequency, load ratios, hydrogen pressure, gaseous impurities, temperature, and material variability. In this study, fatigue crack growth rates were measured in the liner material in 10 MPa gaseous hydrogen at various load

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29

Öcal, Mustafa, and Recep Sadeler. "Corrosion fatigue behavior of Al-5Mg coated AISI 316L stainless steel in sodium chloride environments under bending load." Anti-Corrosion Methods and Materials 66, no. 1 (2019): 34–39. http://dx.doi.org/10.1108/acmm-04-2018-1924.

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Purpose The purpose of this study is to describe the environmentally assisted cracking (EAC) of AISI 316L stainless steel as bare and coated cases in several corrosion environments. The main purpose of this study is to extend the lifespan of 316L material under corrosive fatigue in sodium chloride environments. Design/methodology/approach Fatigue tests carried out by using a Schenk type plane bending fatigue machine made by Tokyokoki Co. A scanning electron microscope (SEM) was used to observe the fracture surfaces and tested specimen surfaces. The micro-Vickers hardness of specimens was measu

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Ogawa, Yuhei, Domas Birenis, Hisao Matsunaga, et al. "Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities." MATEC Web of Conferences 165 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201816503011.

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The role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enhanced dislocation structure evolution and subsequent microvoids formation along the grain boundaries. Additionally, the impact of such IG cracking on the macroscopic FCG rate was evaluated according to the dependency of IG fracture propensity on the hydrogen gas pressure. It was first demonstrated t

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31

Takakuwa, Osamu, Yuhei Ogawa, Saburo Okazaki, Masami Nakamura, and Hisao Matsunaga. "A mechanism behind hydrogen-assisted fatigue crack growth in ferrite-pearlite steel focusing on its behavior in gaseous environment at elevated temperature." Corrosion Science 168 (May 2020): 108558. http://dx.doi.org/10.1016/j.corsci.2020.108558.

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32

Hall, Meryl M. "Effect of cyclic frequency on fracture mode transitions during corrosion fatigue cracking of an Al-Zn-Mg-Cu alloy." Corrosion Reviews 33, no. 6 (2015): 315–34. http://dx.doi.org/10.1515/corrrev-2015-0045.

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AbstractThere are complex issues remaining to be resolved before environment-assisted cracking models can be included in structural mechanics programs that are currently used to analyze mechanical fatigue crack growth. Considered here is the effect of cyclic frequency on fracture mode transitions that occur during corrosion fatigue of high-strength Al-Zn-Mg-Cu alloys. These alloys are used in civilian and military aircraft applications where they are exposed to detrimental aqueous saline environments. A previously developed “critical hydrogen at a critical distance” crack growth model is used

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33

James, L. A. "The Effect of Temperature and Cyclic Frequency Upon Fatigue Crack Growth Behavior of Several Steels in an Elevated Temperature Aqueous Environment." Journal of Pressure Vessel Technology 116, no. 2 (1994): 122–27. http://dx.doi.org/10.1115/1.2929565.

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The fatigue crack propagation (FCP) behavior of several ASTM A302-B and A508-2 steels was characterized in deaerated elevated temperature aqueous environment. FCP behavior was determined over the range 121°C to 343°C at a constant value of ΔK, stress ratio, and load rise time. A complex response of FCP rates as a function of temperature was observed, and this is discussed in the light of similar results developed by others within the nuclear industry. Corrosion potentials (referenced to the standard hydrogen electrode) were measured for each of the steels over the above temperature range and c

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de Castro, Jaime Tupiassú Pinho, Rodrigo Vieira Landim, and Marco Antonio Meggiolaro. "Defect tolerance under environmentally assisted cracking conditions." Corrosion Reviews 33, no. 6 (2015): 417–31. http://dx.doi.org/10.1515/corrrev-2015-0070.

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AbstractNotch sensitivity effects under environmentally assisted cracking (EAC) conditions have been recently quantified considering the tolerance to short cracks that may start at their tips and become nonpropagating after growing for a while, a behavior that depends on the stress gradients ahead of the notch tips and on the basic material resistances to crack initiation and propagation inside an aggressive medium. This model can provide a powerful alternative design tool for the pass/nonpass criterion traditionally used to deal with such mechanical-chemical problems, since it properly consid

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James, L. A., H. B. Lee, G. L. Wire, S. R. Novak, and W. H. Cullen. "Corrosion Fatigue Crack Growth in Clad Low-Alloy Steels—Part II: Water Flow Rate Effects in High-Sulfur Plate Steel." Journal of Pressure Vessel Technology 119, no. 3 (1997): 255–63. http://dx.doi.org/10.1115/1.2842302.

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Corrosion fatigue crack propagation tests were conducted on a high-sulfur ASTM A302-B plate steel overlaid with weld-deposited Alloy EN82H cladding. The specimens featured semi-elliptical surface cracks penetrating approximately 6.3 mm of cladding into the underlying steel. The initial crack sizes were relatively large with surface lengths of 22.8–27.3 mm, and depths of 10.5–14.1 mm. The experiments were initiated in a quasi-stagnant low-oxygen (O2 < 10 pph) aqueous environment at 243°C, under loading conditions (ΔK, R, cyclic frequency) conducive to environmentally assisted cracking (EAC)

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36

Van Der Sluys, W. A., and R. H. Emanuelson. "Cyclic Crack Growth Behavior of Reactor Pressure Vessel Steels in Light Water Reactor Environments." Journal of Engineering Materials and Technology 108, no. 1 (1986): 26–30. http://dx.doi.org/10.1115/1.3225836.

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During normal operation light water reactor (LWR) pressure vessels are subjected to a variety of transients resulting in time varying stresses. Consequently, fatigue and environmentally assisted fatigue are growth mechanisms relevant to flaws in these pressure vessels. In order to provide a better understanding of the resistance of nuclear pressure vessel steels to flaw growth process, a series of fracture mechanics experiments were conducted to generate data on the rate of cyclic crack growth in SA508-2 and SA533B-1 steels in simulated 550°F Boiling Water Reactor (BWR) and 550°F Pressurized W

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37

Arthyka Palifiana, Dheska, and Ratih Kumoro Jati. "HUBUNGAN ANTARA TINGKAT STRES DENGAN KUALITAS TIDUR PADA WARGA BINAAN DI LEMBAGA PEMASYARAKATAN KLAS IIA YOGYAKARTA." MEDIA ILMU KESEHATAN 7, no. 1 (2019): 28–33. http://dx.doi.org/10.30989/mik.v7i1.220.

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Background: To have rest or to sleep is basic need that needed by everyone. To have enough rest or sleep will make body functioned optimally. By sleeping people can restore or to rest the physical after whole day activities, it can reduce stress and anxiety. It also improve concentration and improve ability when doing daily activities. Factors that affect quality and quantity of sleep include ill, fatigue, environment, lifestyle, emotional stress, diet, smoking, stimulant, alcohol, and motivation. The stress level on assisted citizen of woman’s prisoner will be more severe than who are not in

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Palifiana, Dheska Arthyka, and Ratih Kumorojati. "HUBUNGAN ANTARA TINGKAT STRES DENGAN KUALITAS TIDUR PADA WARGA BINAAN DI LEMBAGA PEMASYARAKATAN KLAS IIA YOGYAKARTA." Media Ilmu Kesehatan 7, no. 1 (2018): 28–33. http://dx.doi.org/10.30989/mik.v7i1.262.

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Background: To have rest or to sleep is basic need that needed by everyone. To have enough rest or sleep will make body functioned optimally. By sleeping people can restore or to rest the physical after whole day activities, it can reduce stress and anxiety. It also improve concentration and improve ability when doing daily activities. Factors that affect quality and quantity of sleep include ill, fatigue, environment, lifestyle, emotional stress, diet, smoking, stimulant, alcohol, and motivation. The stress level on assisted citizen of woman’s prisoner will be more severe than who are not in

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39

Kaiser, Trent M. V., Victor Y. B. Yung, and Russ M. Bacon. "Cyclic Mechanical and Fatigue Properties for Oil-Country-Tubular-Goods Materials." SPE Journal 13, no. 04 (2008): 480–86. http://dx.doi.org/10.2118/97775-pa.

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Summary This paper describes differences between actual material behavior and idealizations used for modeling purposes and discusses some of the implications for interpreting model predictions. Much of the design for well structures subjected to high-amplitude cyclic loading is based on material assumptions that extrapolate strength properties from uniaxial, tensile tests to conditions where multiaxial, cyclic stresses are imposed. This paper presents results from cyclic testing on a common oil-country-tubular-goods (OCTG) material and demonstrates differences between the physical behavior mea

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Chen, Ming Ya, Wei Wei Yu, Jin Hua Shi, et al. "Structural Integrity for the RPV of French NPP during the LRA." Applied Mechanics and Materials 853 (September 2016): 453–57. http://dx.doi.org/10.4028/www.scientific.net/amm.853.453.

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Most of the French Nuclear Power Plants (NPPs) are currently embarking upon efforts to renew their operating license, while the pressurized thermal shock (PTS) events and environmentally assisted fatigue (EAF) pose potentially significant challenges to the structural integrity of the reactor pressure vessel (RPV) which has the potential to be NPP life-limiting conditions. In the assessment of the PTS events, the deterministic fracture mechanics (DFM) is still used as the basic mechanics in most countries except for the USA. While the maximum nil-ductility-transition temperature (RTNDT) is abou

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Abbas, Muntazir, and Mahmood Shafiee. "Structural Health Monitoring (SHM) and Determination of Surface Defects in Large Metallic Structures using Ultrasonic Guided Waves." Sensors 18, no. 11 (2018): 3958. http://dx.doi.org/10.3390/s18113958.

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Ultrasonic guided wave (UGW) is one of the most commonly used technologies for non-destructive evaluation (NDE) and structural health monitoring (SHM) of structural components. Because of its excellent long-range diagnostic capability, this method is effective in detecting cracks, material loss, and fatigue-based defects in isotropic and anisotropic structures. The shape and orientation of structural defects are critical parameters during the investigation of crack propagation, assessment of damage severity, and prediction of remaining useful life (RUL) of structures. These parameters become e

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Krausz, Alex S., Xijia Wu, Zhiwen Lian, and Klara Krausz. "On the Constitutive Law of Environment Assisted Fatigue: The Physical Meaning of the Paris Iype Equations / Die konstitutive Gleichung für die umgebungsinduzierte Ermüdung: Die physikalische Bedeutung der Paris-Gleichungen." International Journal of Materials Research 83, no. 5 (1992): 356–63. http://dx.doi.org/10.1515/ijmr-1992-830513.

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MATHIS, Aude, Thierry MILLOT, Vincent BRANGER, Remy MULLER, and Jean-Yves GUENEHEUX. "Tribological functionalization of titanium alloys by Micro-Arc Oxidation for marine applications." MATEC Web of Conferences 321 (2020): 09001. http://dx.doi.org/10.1051/matecconf/202032109001.

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Micro-arc Oxidation (MAO) process is a plasma assisted electrochemical process, which allows formation of ceramic-like dry oxides on top of light alloys surfaces. The good corrosion resistance as well as the low density of titanium alloys are recognized and so required for conception of structural parts in marine environment. However, their tribological behaviour reveals an important tendency to stick-slip phenomenon, which makes use of these alloys for dynamic contact mechanisms difficult. Through the MAO project from IRT M2P, formation of a MAO coating composed of aluminium titanate has been

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Kujawski, Daniel, and Phani C. R. Sree. "Modeling of environmentally assisted fatigue crack growth behavior." Corrosion Reviews 33, no. 6 (2015): 351–59. http://dx.doi.org/10.1515/corrrev-2015-0064.

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AbstractIt is well recognized that environment has a significant role on the failure of mechanically loaded structures. In most cases of cyclic loading, fatigue crack growth (FCG) behavior exhibits lower threshold and faster growth rate in air than in vacuum. It is well documented that the effect of loading frequency on FCG behavior can be more pronounced in aggressive environment/material systems. This is seen in the Kmax term of the FCG. On the other hand, a weak dependence of FCG behavior with R ratio in inert environment indicates that a crack extension is governed mainly by ΔK. Existing e

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Phadte, Saloni, Sharvi Shenvi, Siddhant Prabhudesai, and Jai Sawant. "Electrically Assisted Bicycle Adapted to Urban Mobility." International Journal for Research in Applied Science and Engineering Technology 10, no. 8 (2022): 423–26. http://dx.doi.org/10.22214/ijraset.2022.46205.

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Abstract: Traffic congestion, energy conservation and environmental issues are fuelling the interest in light electric vehicles. In particular, electric vehicles are compelling because of their low cost, ease of use, lightweight, and extremely small footprint. This project deals with design and fabrication of a low-cost portable electric bicycle kit which makes use of electric energy as the primary source and can be mounted on any non-geared bicycle. It has two modes of drive; one is manual i.e. by pedalling and the other one is electric by using electric power from a DC battery. The kit consi

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Petit, Jean, Christine Sarrazin-Baudoux, and Michel Gerland. "Influence of Microstructure, Environment and Temperature on Fatigue Crack Propagation in 2XXX Aluminium Alloys." Key Engineering Materials 592-593 (November 2013): 22–29. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.22.

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Aluminum alloys, widely used for constitutive parts of aircrafts are confronted to a wide range of temperature depending on altitude and climate, from room temperature on the ground down to some 223K at high altitude. The fatigue crack growth behavior of two new generation aluminum alloys, 2024A in T351 temper and 2022 in T351 and T851 tempers, have been investigated at both temperatures. It is shown that temperature and air humidity do not affect the crack growth resistance of the peak aged 2022 while these two parameters widely influence the crack growth in the under-aged alloys which exhibi

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Loew, Stefan, and Carlo L. Bottasso. "Lidar-assisted model predictive control of wind turbine fatigue via online rainflow counting considering stress history." Wind Energy Science 7, no. 4 (2022): 1605–25. http://dx.doi.org/10.5194/wes-7-1605-2022.

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Abstract. The formulation of parametric online rainflow counting implements the standard fatigue estimation process and a stress history in the cost function of a model predictive controller. The formulation is tested in realistic simulation scenarios in which the states are estimated by a moving horizon estimator and the wind is predicted by a lidar simulator. The tuning procedure for the controller toolchain is carefully explained. In comparison to a conventional model predictive controller (MPC) in a turbulent wind setting, the novel formulation is especially superior with low lidar quality

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Arrieta, Sergio, Francisco Javier Perosanz, Jose Miguel Barcala, Maria Luisa Ruiz, and Sergio Cicero. "Using Direct Current Potential Drop Technique to Estimate Fatigue Crack Growth Rates in Solid Bar Specimens under Environmental Assisted Fatigue in Simulated Pressurized Water Reactor Conditions." Metals 12, no. 12 (2022): 2091. http://dx.doi.org/10.3390/met12122091.

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The direct current potential drop (DCPD) technique may be used in crack propagation tests to measure the crack growth rate (CGR). Potential probes attached to the specimen allow the variation of the crack length to be estimated. In this research, the DCPD technique using one single potential probe was applied to solid bar specimens (i.e., without any initial notch or crack) subjected to low-cycle fatigue testing in a simulated pressurized water reactor (PWR) environment. This particular analysis had two associated difficulties, the first one being the fact that crack initiation sites are not k

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Ma, Kai, Jinyang Zheng, Zhengli Hua, Chaohua Gu, Ruiming Zhang, and Yayu Liu. "Hydrogen assisted fatigue life of Cr–Mo steel pressure vessel with coplanar cracks based on fatigue crack growth analysis." International Journal of Hydrogen Energy 45, no. 38 (2020): 20132–41. http://dx.doi.org/10.1016/j.ijhydene.2020.05.034.

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Takakuwa, O., and H. Soyama. "Suppression of hydrogen-assisted fatigue crack growth in austenitic stainless steel by cavitation peening." International Journal of Hydrogen Energy 37, no. 6 (2012): 5268–76. http://dx.doi.org/10.1016/j.ijhydene.2011.12.035.

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