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Relevant bibliographies by topics / Creep factor

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Academic literature on the topic 'Creep factor'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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Journal articles on the topic "Creep factor"

1

Pogue, David. "Google's Creep Factor." Scientific American 308, no. 6 (2013): 38. http://dx.doi.org/10.1038/scientificamerican0613-38.

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Nesvetaev, G. V., I. V. Korchagin, and Y. Y. Lopatina. "On Effect of Superplasticizers and Mineral Additives on Creep Factor of Hardened Cement Paste and Concrete." Solid State Phenomena 265 (September 2017): 109–13. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.109.

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The relationship between the creep factor of concrete and hardened cement paste and the E-modulus of aggregate and evaluation of the effects of some modifiers on the creep factor of the hardened cement paste was determined. The influence of the SP on the creep factor of hardened cement paste is ambiguous: SP may increase, decrease, or not change the creep factor. The possible deviation of creep factor of hardened cement paste with the SP in certain cases can be up to 4 times. The average statistical increase in the creep factor of hardened cement paste may be 7 to 35%. The creep factor of regu

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Abdul Ghafir, Mohammad Fahmi, Yi Guang Li, A. A. Wahab, et al. "Impact of Operating and Health Conditions on a Helicopter Turbo-Shaft Hot Section Component Using Creep Factor." Applied Mechanics and Materials 225 (November 2012): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.225.239.

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The paper investigates the effects of various gas turbine operating and health conditions on its hot section component’s creep life via a simple relative creep life parameter known as Creep Factor. Using the Creep Factor, the correlation between individual gas turbine operating and health parameter and component’s creep life was established and the weight of the impact was measured. Analytical-parametric-based creep life estimation model combined with the Creep Factor approach was developed and integrated with an existing engine performance model to allow the estimation of various hot section

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Sklenička, Vàclav, Květa Kuchařová, Jiří Dvořák, Marie Kvapilová та Petr Král. "Creep Damage Tolerance Factor λ of Selected Creep-Resistant Steels". Key Engineering Materials 754 (вересень 2017): 47–50. http://dx.doi.org/10.4028/www.scientific.net/kem.754.47.

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The creep damage tolerance factor λ as an important outcome of the continuum damage mechanics approach has been used to asses the creep fracture mode and the susceptibility of material to localized cracking at strain concentrations. In this work, using sets of our earlier published creep data of three advanced ferritic creep-resistant steels (T23 low alloy steel, P91 and P92 chromium steels) are analysed in terms of the creep damage tolerance factor λ. It was found that the value of the creep damage factor λ is not constant and depends on the creep loading conditions. The data analysis is foll

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Zhang, Zhen, Duo Yi Zhu, Teng Fei Chen, and Tao Wang. "Confined-Accelerated Creep Tests to Determine the Creep Reduction Factor." Applied Mechanics and Materials 539 (July 2014): 769–73. http://dx.doi.org/10.4028/www.scientific.net/amm.539.769.

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The creep characteristics of geogrids is one of the most important factors affecting its permanent in reinforced soil structures. currently, most of the creep tests are under unconfined conditions, the results deviates significantly from the real status in the application . And conventional creep tests are time-consuming and costing.In this paper, time-temperature superposition principle of geosynthetics is used to accelerate creep and shorten test time. This paper presents a new device to perform simultaneously confined and accelerated creep tests on HDPE50 geogrid . According to the results

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Masuyama, Haruki, Tetsuya Matsunaga, Yoshiaki Toda, Tsutomu Ito, Masayuki Shimojo та Yoko Yamabe-Mitarai. "Microstructure Factor of Creep Behavior in Near-α Ti Alloy". Materials Science Forum 1016 (січень 2021): 1882–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1882.

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Heat-resistant Ti-Al-Nb-Zr alloys, which don’t contain Sn, have been designed to obtain good oxidation resistance above 600 °C. In addition, to design Ti alloys with best balance of creep and fatigue properties, prior β grain size which affects fatigue properties and lamellar microstructure which affects creep properties were controlled by heat treatment. In the present study, the effect of microstructure on creep properties of one of the alloys, i.e., Ti-7.5Al-4Nb-4Zr alloy, with the bimodal (B), the lamellar structures in small prior β grains (LS), and the lamellar in large prior β grains (L

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Pan, Zuanfeng, Dong Cao, Bin Zeng, and Yuwei Wang. "Nonlinear Creep Amplification Factor Considering Damage Evolution of Concrete under Compression." Materials 15, no. 19 (2022): 6742. http://dx.doi.org/10.3390/ma15196742.

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Creep affects the long-term deformation of concrete structures. Nonlinear creep further overestimates the safety factor of structures and affects the safety service performance. The coupling of creep and a damage model considering the rate effect is conducive to accurate prediction of nonlinear creep, but the iterative process of strain makes the calculation method more complex. The purpose of this study is to propose a nonlinear creep explicit method that considers the damage evolution of concrete under compression. Two groups of axial compression members with compressive stresses of 0.2 fc a

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Basuki, Achmad, Ali Awaludin, Bambang Suhendro, and Suprapto Siswosukarto. "Creep Behavior of Open Web Truss Joist Made of LVL Sengon." MEDIA KOMUNIKASI TEKNIK SIPIL 27, no. 1 (2021): 9–17. http://dx.doi.org/10.14710/mkts.v27i1.31916.

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Laminated Veneer Lumber (LVL) Sengon is classified as one of the engineering products having a significant increase of both physical and mechanical properties compared with Sengon solid wood. Considering its short planting years and sustainable production, Sengon wood is very potential to be used as construction materials of low-rise houses to support the housing needs in Indonesia. Creep behaviour of LVL Sengon material is one of the mechanical properties that needs to be considered. This article evaluated value of creep factor of the open web truss joist (OWTJ) LVL Sengon test and compared t

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Liu, Qun, Xiang Wang, and Xiao Dong Song. "Study on Test of the Influence of Moisture Content on Creep Property of Sandy Slate Coarse-Grained Soil." Applied Mechanics and Materials 405-408 (September 2013): 1733–38. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1733.

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Coarse-grained soil is widely used in subgrade engineering, creep property of which is the important factor that affects long-term settlement of fill embankment. The creep property of sandy slate coarse-grained soil under different moisture conditions is analyzed through uniaxial compression creep test on influence rule of moisture content on creep of coarse-grained soil. Relations between moisture contents and creep parameters are studied on the basis of H-K Creep Model. It turns out that moisture content is the important factor that affects creep property of sandy slate coarse-grained soil a

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Majima, T., and Q. Liu. "Strain concentration factor of notched cylindrical bars under tension creep." Journal of Strain Analysis for Engineering Design 35, no. 6 (2000): 507–19. http://dx.doi.org/10.1243/0309324001514260.

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Variations in the new strain concentration factor (SNCF) with creep deformation have been studied for notched cylindrical bars. This new SNCF is based on the average axial strain, defined under the triaxial state of stress at the net section. The uniaxial creep constitutive equations employed in the finite element calculations are primary-tertiary, primary-secondary and tertiary creep. With creep deformation the new SNCF increases sharply from its elastic value and reaches a maximum. After that it gradually decreases from the maximum with creep deformation. The new SNCF decreases at any deform

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Dissertations / Theses on the topic "Creep factor"

1

Madhi, Elhoucine. "In-Situ Creep Monitoring Using Directional Potential Drop Sensors." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1288378941.

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Zouhar, Michal. "Deformačně napěťová analýza a hodnocení mezních stavů částí tlustostěnného potrubí v oblasti creepu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228762.

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This thesis deals with the stress-strain analysis of thick-walled pipe parts. The dimension series (characterized by the D/d ratio) of three components are solved, then a direct tube, a torus with constant wall thickness (arcus) and a torus with variable wall thickness (bend). At first, the internal pressure amount, when a fully plastic state for these components is created, is solved. The amount of the limit pressure is determined analytically, numerically and by appropriate normative relations. The results and stress diagrams of individual solutions are mutually compared. Furthermore, these

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Luky, Robin. "Predikce creepového poškození polymerních trubek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230310.

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A new methodology of polymer pipe lifetime estimation taking into account residual stresses is described in this thesis. Engineering equations derived based on numerical simulations of a hydrostatic pressure test are proposed. Residual lifetime calculations were performed for different loading conditions using experimental data of a creep crack propagation in studied material and stress distribution in the pipe wall. The effects which significantly influence lifetime estimation were quantified with special focus on residual stresses.

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Lee, Herng-Fu. "Factors affecting the creep feeding behaviour of suckling piglets." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/28414.

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Five experiments were designed to investigate factors affecting the creep feeding of suckling piglets and a preliminary method to monitor the creep feeding of suckling piglets was developed. In experiment 1, neonatal viability and creep feeding behaviour on d 14-15 were monitored. Birth weight rather than birth order affected the neonatal viability in terms of cumulative suck number (<i>P</i>< 0.01). The lighter piglets at birth went to contact the feeder faster (<i>P</i>< 0.10), but tended to touch the food slower (<i>P</i>< 0.10) on dl4 when creep food was introduced. Neither birth weight or

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Horsák, Libor. "Optimalizace tvaru háků v pecích petrochemického průmyslu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228912.

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Master’s thesis, „Optimization of hanger design in petrochemical industry heaters”, describes a procedure and means, leading to better hanger design in various cases. The thesis describes several problems which are necessary to be solved in hanger design. Technical expertise is executed on hangers of various designs. The procedure of optimization is shown on one chosen hanger design.

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Hsiao, Yu-Hsian. "Factors affecting creep damage accumulation and mechanical properties of 316 stainless steel weldments /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487849377292843.

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Drummer, Kadene Sue. "A Chippewa Cree students' college experience: factors affecting persistence." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/drummer/DrummerK0509.pdf.

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Educators working with Chippewa Cree students need to understand how the students' precollege experiences, college experiences, and cultural backgrounds influence their success in higher education in order to design learning environments, procedures, and policies that will increase the graduation rate of this population. The purpose of this grounded theory study was to explore factors that help or hinder successful completion of a bachelor's degree by students from the Chippewa Cree Tribe. Data was collected in face-to-face interviews using a peer-reviewed interview protocol consisting of open

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Carpenter, Evan S. "Identifying Cultural and Non-cultural Factors Affecting Litter Patterns in Hickory Creek, Texas." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699896/.

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Plastic deposition in hydrological systems is a pervasive problem at all geographic scales from loci of pollution to global ocean circulation. Much attention has been devoted to plastic deposition in marine contexts, but little is known about inputs of plastics into local hydrological systems, such as streams. Any attempt to prevent plastic litter must confront people’s behaviors, so archaeological concepts are used to distinguish between various cultural inputs (e.g., littering) and non-cultural forces (e.g., stream transport) that affect litter patterns on the landscape. Litter surveys along

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Ray, Bradley A. "Factors affecting largemouth bass recruitment in a trophy bass reservoir of Virginia, Briery Creek Lake." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28724.

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Briery Creek Lake (BCL) has low abundance of young largemouth bass (LMB) compared to Sandy River Reservoir (SRR), which could jeopardize the trophy-LMB management goal in BCL. I assessed factors that may limit recruitment of LMB in BCL: angling, predation, competition, growth, and food availability. Age-0 LMB were monitored from nesting through their first summer with nest surveys, light traps, and electrofishing. Nesting success was higher in BCL (53%) than SRR (31%). Initial light trap catch-per-unit-effort (CPUE) was higher in BCL than SRR but, by July, light trap and electrofishing CPUE wa

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Gonzalez, Nicolas Alejandro. "Principal Components Analysis, Factor Analysis and Trend Correlations of Twenty-Eight Years of Water Quality Data of Deer Creek Reservoir, Utah." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3309.

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I evaluated twenty-eight years (1980-2007) of spatial-temporal water quality data from Deer Creek Reservoir in Utah. The data came from three sampling points representing the lotic, transitional and lentic zones. The data included measurements of climatological, hydrological and water quality conditions at four depths; Surface, Above Thermocline, Below Thermocline and Bottom. The time frame spanned dates before and after the completion of the Jordanelle Reservoir (1987-1992), approximately fourteen miles upstream of Deer Creek. I compared temporal groupings and found that a traditional month d

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Books on the topic "Creep factor"

1

Library, Plastics Design, ed. The effect of creep and other time related factors on plastics. Plastics Design Library, 1991.

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Library, Plastics Design, ed. The effect of creep and other time related factors on plastics. Plastics Design Library, 1991.

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1946-, Beardy Flora, and Coutts Robert 1953-, eds. Voices from Hudson Bay: Cree stories from York Factory. McGill-Queen's University Press, 1996.

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McKeen, Laurence W. The effect of creep and other time related factors on plastics and elastomers. 2nd ed. W. Andrew, 2009.

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James, Deborah. Preverbs and the function of clauses in Moose Cree. Voices of Rupert's Land, 1991.

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Omushkego Syllabic Conference (1996 Moose Factory, Ont.). Omushkego Syllabic Conference: Preserve our language : February 27, 28, 29 1996, Moose Factory, James Bay, Ontario. [s.n.], 1996.

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Washington (State). Dept. of Ecology., ed. Lean and environment pilot project case study: Canyon Creek Cabinet Company, 2006. Washington State Dept. of Ecology, 2006.

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8

V, Rossiter, and National Institute of Standards and Technology (U.S.), eds. Performance of tape-bonded seams of EPDM membranes: Effect of material and application factors on peel creep-rupture response. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1997.

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9

J, Rossiter Walter, and National Institute of Standards and Technology (U.S.), eds. Performance of tape-bonded seams of EPDM membranes: Effect of material and application factors on peel creep-rupture response. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1997.

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J, Rossiter Walter, and National Institute of Standards and Technology (U.S.), eds. Performance of tape-bonded seams of EPDM membranes: Effect of material and application factors on peel creep-rupture response. U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1997.

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Book chapters on the topic "Creep factor"

1

Sobotka, J., K. Thiemeil, V. Bína, J. Hakl, and T. Vlasák. "Influence of Vanadium on the Creep Rupture Strength Reduction Factor of Boiler Tubes Made of Low-Alloy Creep-Resistant Steels." In Mathematical Modelling of Weld Phenomena: No. 5. CRC Press, 2025. https://doi.org/10.1201/9781003580065-28.

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2

Sandström, Rolf. "Precipitation Hardening." In Basic Modeling and Theory of Creep of Metallic Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-49507-6_7.

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AbstractModels for precipitation hardening (PH) at room temperature have been available for a long time. In spite of the importance of PH, it took a long time to establish models for elevated temperatures. In fact, empirically the room temperature models have also been used at higher temperatures. This gives the wrong temperature dependence and overestimates PH. It was for a long time thought that it was an energy barrier for climb across particles that was the controlling mechanism, but it was gradually appearing that this effect was so small that it could be neglected. Instead it is time it

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Penny, R. K., and D. L. Marriott. "Factors affecting strain accumulation." In Design for Creep. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0561-3_2.

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Ge, Tao, and Le Yan. "Experimental Study on Creep Behavior of Prestressed Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4090-1_6.

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AbstractIn order to study the influencing factors and variation patterns of the creep performance of prestressed concrete, the creep deformation of concrete specimens caused by long-term constant pressure and the instantaneous elastic deformation at the initial moment of applying this load were measured through experiments. The creep coefficient is mainly related to water reducing agents and additives, and the creep coefficient of concrete with single addition of fly ash at the same age is higher than that of concrete with double addition of fly ash and slag micro powder. Therefore, current re

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Han, Mingda, Hetong Liu, Yujian Tang, Yibo Zhang, and Weixu Zhang. "An Efficient Strategy for Creep-Fatigue Assessment of Pipelines with Complex Local Structures and High Computational Demands." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_53.

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AbstractThermal pipelines are extensively utilized in power plants, and they operate in high-temperature and high-pressure environments. Consequently, creep and fatigue are two crucial factors that need to be considered in the design and operation of main pipelines. Assessing the safety of main pipelines considering creep-fatigue is of paramount importance. However, the current assessment of main pipelines faces challenges such as large computational requirements and susceptibility to complex local structures, making efficient evaluation a longstanding problem. Furthermore, there is a lack of

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Fuh, Kuang-Hua, and Jane-Lin Wang. "The Force Model of Creep-Feed Dry Grinding." In Toward the Factory of the Future. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82580-4_37.

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Gerlitz, Eva, and Maximilian Häring. "Privacy Research on the Pulse of Time: COVID-19 Contact-Tracing Apps." In Human Factors in Privacy Research. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28643-8_11.

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AbstractIn 2020, COVID-19 hit the World, and with it came the desire for a well-functioning and fast-working possibility to trace contacts of those people who tested positive for the virus, a method called contact tracing. Depending on how automated tracing is implemented, it is necessary to capture and store sensitive information about the user, such as where the user has been, who they were in contact with, and their health status. All of this entails the potential of mission creep and surveillance. In this chapter, we give a brief outline of the tracing technologies and their implications f

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Tan, Qinwen, and Huiming Tang. "In Situ Triaxial Creep Test on Gravelly Slip Zone Soil of a Giant Landslide: Innovative Attempts and Findings." In Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18471-0_9.

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AbstractIn recent years, numerous landslides catastrophes have occurred, generating considerable financial losses and other tolls. The deformational and mechanical properties of sliding zone soil would be of primary significance to landslide research, as the sliding zone basically controls the initiation and mobility of the landslide. An in situ triaxial test was carried out on a sample from the sliding zone of the Riverside Slump 1# landslide, a subdivision of the Huangtupo landslide in the Three Gorges area of China. The test results indicate that a. the sliding zone exhibits low compressibi

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Parker, J. "Factors Affecting the High Temperature Performance of Creep Strength Enhanced Ferritic Steels." In Energy Materials 2014. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48765-6_4.

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Yokokawa, Tadaharu, Hiroshi Harada, Kyoko Kawagishi, Yutaka Koizumi, and Toshiharu Kobayashi. "Quantitative Analysis of Creep Strengthening Factors in Ni-Base Single Crystal Superalloys." In Superalloys 2012. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118516430.ch31.

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Conference papers on the topic "Creep factor"

1

Scholz, A., C. Berger, F. Mueller, and A. Klenk. "Long-Term Crack Behavior under Creep and Creep-Fatigue Conditions of Heat Resistant Steels." In AM-EPRI 2007, edited by R. Viswanathan, D. Gandy, and K. Coleman. ASM International, 2007. https://doi.org/10.31399/asm.cp.am-epri-2007p0718.

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Abstract High temperature components with notches, defects and flaws may be subject to crack initiation and crack propagation under long-term service conditions. To study these problems and to support an advanced remnant life evaluation, fracture mechanics procedures are required. Since a more flexible service mode of power plants causes more start up and shut down events as well as variable loading conditions, creep-fatigue crack behavior becomes more and more decisive for life assessment and integrity of such components. For steam power plant forged and cast components, the crack initiation

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Soundararajan, Sudharsanan. "Remaining Life Assessment of 9Cr-1Mo Steel Radiant Heater Tube in Continuous Catalytic Reforming Unit." In CONFERENCE 2024. AMPP, 2024. https://doi.org/10.5006/c2024-21147.

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Abstract The radiant tubes in fired heaters operating in the creep range are designed as per API 530. The typical creep design life of the heater tubes is 100,000hours. Tube sample from this 1st Inter-heater was removed after 166,500hours of operation with the process gas outlet temperature of 550°C (1022°F). The tube skin temperature was observed in the range of 600-630°C. Scale characterization using SEM/EDS, Hot and ambient tensile testing, Hardness measurement, Accelerated Creep rupture testing and creep testing was carried out as part of the assessment. This paper explains the methodology

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Wang, Xiaoxiao, Haofeng Chen, and Weiling Luan. "Reliability-Based Safety Factor for Pressurized Components Considering Creep-Fatigue Failure." In ASME 2024 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/pvp2024-122880.

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Abstract Currently, the structural assessment procedures mainly rely on deterministic analysis considering the bounding values of the design parameters, and by adopting a safety factor, sufficient strength reserve is maintained to satisfy the uncertain factors. This safety factor is determined by the extensive expert experience, with redundant conservativeness included more or less. In this study, the reliability-based safety factor is developed by the established probabilistic Linear Matching Method framework (pLMM), to deal with the engineering component assessments under thermal-mechanical

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Han, Jae-Jun, Kuk-Hee Lee, Yun-Jae Kim, Kamran Nikbin, and David Dean. "Effect of Creep Mismatch Factor on Steady State Creep Stresses in Welded Components With Heat Affected Zone." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57480.

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This paper describes steady-state stress on welded branch components using detailed three dimensional elastic creep finite element analyses. In our previous paper [1], it was found that the mismatch effect in creep on steady-state stresses within the weld metal for a various branch junction could be uniquely quantified by the mis-match factor, defined as a function of creep exponent and constant. In actual branch components, the branch junction contains the heat-affected zone (HAZ) when the branch pipe is welded. Thus, additional mismatch factor for HAZ should be presented. This paper deals wi

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Komazaki, Shin-ichi, Yuya Ohkawa, and Mitsuharu Yonemura. "Effect of Ductility on Load-Stress Conversion Factor of Small Punch Creep Test." In AM-EPRI 2016, edited by J. Parker, J. Shingledecker, and J. Siefert. ASM International, 2016. http://dx.doi.org/10.31399/asm.cp.am-epri-2016p0622.

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Abstract Remaining-life assessment of high temperature components using the small punch (SP) creep testing technique necessitates the evaluation of SP load (F)/uniaxial stress (σ) conversion factor, F/σ, obtained by comparing the SP and uniaxial creep test results. In the present study, the SP creep tests were carried out at 850°C on various Ni-base alloys having different reduction of area in the range of 0.05-0.67 to investigate the influence of creep ductility on the value of F/σ. The F/σ value was determined for each alloy by correlating SP creep rupture data with corresponding uniaxial cr

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Abdul Ghafir, M. F., Y. G. Li, R. Singh, K. Huang, and X. Feng. "Impact of Operating and Health Conditions on Aero Gas Turbine: Hot Section Creep Life Using a Creep Factor Approach." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22332.

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A thorough assessment of component life is very important to ensure both the safety and economics of gas turbine operation. As a component’s life given by OEM is based on certain ambient and operating conditions, its actual life may vary substantially when the ambient, operating and engine health conditions change. Therefore possessing knowledge on how those conditions affect actual component life will be valuable in making informed maintenance decisions, maximising operation effectiveness and cutting down operating costs. In this paper, an impact analysis on component creep life due to differ

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Masuyama, Fujimitsu, and Tomiko Yamaguchi. "Chemical Specification and Design Factor Consideration for Creep Degradation in Grade 91 Steel." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63307.

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The power plant materials engineers are still tweaking the specification of grade 91 in order to prevent the improper production and construction. In this sense the chemistry, heat treatment conditions and design/fabrication rules for this steel should be highly optimized to achieve the safe elevated temperature properties and to avoid the abuse during the construction. This paper presents the recent findings on creep degradation behavior in grade 91 followed by the review and discussion about the effect of chemical composition and constituent on the creep strength/ductility in correlation to

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Day, William, Nathan O’Nora, and Ali P. Gordon. "Temperature Margin Calculation During Finite Element Creep Simulations." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-121776.

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Abstract Creep deformation in turbomachinery applications is a highly non-linear phenomenon. Very small alterations in stress or temperature will substantially change the progression of creep. Common rules-of-thumb would suggest that a change in temperature of +/−10 to 15°C may halve or double the average rupture life respectively. Even in well-controlled laboratory conditions the stochastic nature of creep means that identical tests may differ by a factor of two. Even if an analyst has incorporated a very accurate creep model into an implicit finite element user creep subroutine, they may lac

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Lee, Kuk-Hee, Yun-Jae Kim, Robert A. Ainsworth, David Dean, and Tae-Eun Jin. "Elastic Follow-Up Factor for Cruciform Plate Under Bi-Axial Loading." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57185.

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This paper derives analytical solutions of the elastic follow-up factor for power-law creeping cruciform plates under bi-axial displacements to investigate the effect of multi-axial stress states on elastic follow-up behaviors. Validity of the proposed solutions is checked against the results from finite element analyses using power-law creep material. Based on proposed solutions, effects of the biaxiality, geometry, Poisson’s ratio and creep exponent on elastic follow-up factors are discussed. Present results show that the elastic follow-up factor for structure with structural discontinuity c

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Nagae, Yuji, Kenji Yamamoto, and Tomomi Otani. "Evaluation Method of Creep-Fatigue Life for 316FR Weldment." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45513.

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The most important failure mode to be prevented is creep-fatigue at elevated temperatures in fast reactors. 316FR stainless steel is a candidate material for the reactor vessel and internal structures. A method to evaluate creep-fatigue life, based on the time fraction rule, has been already developed in base metal of 316FR stainless steel. Development of procedure in evaluating creep-fatigue life is also necessary for the weldment of 316FR stainless steel by similar fillers or 16-8-2 fillers. Compared between mechanical properties of weldment and those of base metal, strength-reduction factor

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Reports on the topic "Creep factor"

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Cooke. L51783 100000 Hour Design Life of Turbo Compressor Packages. Pipeline Research Council International, Inc. (PRCI), 1998. http://dx.doi.org/10.55274/r0010340.

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The gas pipeline industry continues to respond to the challenges of competitive markets and the need to manage the cost of service effectively. A major cost element being reviewed by the industry is the operating and maintenance expense for its fleet of older turbo compressor units. Many turbo-machinery manufacturers and operators typically quote 100,000 hours as a design limit for service life of turbo compressor components. The Pipeline Research Committee initiated this study to review the life limiting criteria for certain critical components and determine if the design target of 100,000 ho

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Corum, J. M. Experimental and analytical evaluation of weldment creep strength reduction factors for elevated-temperature structural design. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/714514.

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Peitz, David. White-tailed deer monitoring at Wilson’s Creek National Battleﬁeld, Missouri: 2005–2022 trend report. Редактор Tani Hubbard. National Park Service, 2022. http://dx.doi.org/10.36967/2295163.

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The Heartland Inventory and Monitoring Network has monitored white-tailed deer over an 18-year period (2005–2022) within a defined survey area of Wilson’s Creek National Battlefield, documenting both a rapid decline and recovery in the population. The rapid die-off was the result of a region-wide hemorrhagic disease outbreak reported by the Missouri Department of Conservation that started in the fall of 2005, six months after we initiated deer monitoring. Although declines occurred 2005 to 2007, 2016 to 2017, and 2019 to 2022, the deer population still increased on average by 7.2% annually. Th

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Fessler. L52040 The Mechanisms of High-pH and Near-Neutral pH SCC-Unresolved Issues and Experimental Techniques. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011285.

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Key unresolved issues related to the mechanisms of high-pH and near-neutral-pH stress-corrosion cracking (SCC) were identified based upon a review of the technical literature. It was determined that the mechanism of high-pH SCC is well understood, the key outstanding issue being related to the factors that affect the micro-creep properties of a steel, which seem to be the primary determinant of its susceptibility to SCC. The mechanism of near-neutral-pH SCC is not so well understood. Both dissolution and hydrogen appear to be involved, but their relative roles remain to be determined. Some exp

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Desiderati, Christopher. Carli Creek Regional Water Quality Project: Assessing Water Quality Improvement at an Urban Stormwater Constructed Wetland. Portland State University, 2022. http://dx.doi.org/10.15760/mem.78.

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Stormwater management is an ongoing challenge in the United States and the world at-large. As state and municipal agencies grapple with conflicting interests like encouraging land development, complying with permits to control stormwater discharges, “urban stream syndrome” effects, and charges to steward natural resources for the long-term, some agencies may turn to constructed wetlands (CWs) as aesthetically pleasing and functional natural analogs for attenuating pollution delivered by stormwater runoff to rivers and streams. Constructed wetlands retain pollutants via common physical, physico

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Cramer, Grant R., and Nirit Bernstein. Mechanisms for Control of Leaf Growth during Salinity Stress. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7570555.bard.

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In the project "Mechanisms for Control of Leaf Growth during Salinity Stress" ionic and enzymatic changes in the cells and cell walls of the expanding region of salt-stressed maize leaves were evaluated. Conventional numerical techniques for REG estimation were reevaluated; 'Greens' method was recommended and applied throughout the project for growth intensity estimation. Salinity slowed leaf development and reduced leaf size, but increased cell development within the leaf-growing zone. Leaf elongation rate was most affected by salinity from the region of maximal growth to the distal end; the

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Peitz, David, and Naomi Reibold. Bird community monitoring at Wilson’s Creek National Battlefield, Missouri: Status report 2008–2020. Edited by Tani Hubbard. National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2287875.

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Breeding bird surveys were initiated on Wilson’s Creek National Monument, Missouri, in 2008 to assess temporal changes in the species composition and abundance of birds on the park and to improve our understanding of relationships between breeding birds and their habitat and the effects of management actions, such as invasive plant species control and tree thinning, on bird populations. Birds were sampled using point counts with 38 variable circular plots located on a systematic grid of 400 x 400-m cells (originating from a random start point). All birds seen or heard on a plot during a 5-min

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Boyle, Maxwell (Forbes), Mallorie Davis, Maxwell (Forbes) Boyle, and Mallorie Davis. Terrestrial vegetation monitoring at Moores Creek National Battlefield: 2022 data summary. National Park Service, 2024. http://dx.doi.org/10.36967/2306499.

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Parks within the Southeast Coast Network (SECN) host a diverse assemblage of plants and terrestrial vegetation communities. Vegetation communities are dynamic entities whose species composition, abundance, distribution, and structure are influenced by environmental factors and impacted over time by natural and anthropogenic disturbances. Determining trends in vegetation communities over time and identifying plant stressors is vital to understanding the ecological health of terrestrial ecosystems within SECN parks. Moores Creek National Battlefield lies within the Middle Atlantic Coastal Plain

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Olsen and Wilson. L52145 Geomechanical Analysis and Design Considerations for Thin-Bedded Salt Caverns. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0011349.

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he bedded salt formations located throughout the United States are layered and interspersed with non-salt materials such as anhydrite, shale, dolomite and limestone. The salt layers often contain significant impurities. GRI and DOE have initialized this research proposal in order to increase the gas storage capabilities by providing operators with improved geotechnical design and operating guidelines for thin bedded salt caverns. Terralog has summarized the geologic conditions, pressure conditions and critical design factors that may lead to: Fracture in heterogeneous materials; Differential d

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Fajardo-Zapata, Álvaro Luis, Yuri Lilian González Valencia, Jenny Fabiola Hernández Niño, Myriam Leonor Torres Pérez, and Héctor Andrés Hernández. Percepción del riesgo en el ámbito laboral. Universidad Nacional Abierta y a Distancia - UNAD, 2019. http://dx.doi.org/10.22490/ecisa.3203.

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Introducción: Se presenta el tema de la percepción del riesgo como un elemento pertinente en el ámbito laboral para la prevención de Accidentes de Trabajo y Enfermedad Laboral. Desarrollo: Existen factores y teorías relacionadas que tratan de abordar este tema y dar una explicación coherente con el actuar humano; se mencionan las características estructurales o institucionales, los aspectos individuales y los psicológicos. En lo estructural se destaca, la cultura organizacional hacia la seguridad, el cumplimiento, la confianza y el compromiso de las organizaciones hacia la seguridad de los tra

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