Relevant bibliographies by topics / Creep at high temperatures

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Creep at high temperatures'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Creep at high temperatures"

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Pan, Jingping, Shuheng Tu, Xinwei Zhu, and Lianjiang Tan. "Creep behavior and cavitation evolution of 15CrMoG steel at high temperatures." Advances in Mechanical Engineering 11, no. 8 (August 2019): 168781401986566. http://dx.doi.org/10.1177/1687814019865669.

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15CrMoG steel is a type of heat-resistant steel frequently used in boiler and piping systems. Creep properties of the 15CrMoG steel at service temperatures are not much documented due to the difficulties in obtaining long-term creep data. Herein, the creep behavior and the cavity evolution of 15CrMoG steel were investigated based on 20,000 h of creep tests at varied temperatures. Creep curves were analyzed to elucidate the creep behavior and creep rupture mechanism of the 15CrMoG steel. A continuum damage model was adopted to fit the rupture stress versus creep time data, and the results showed the reliability of this model in describing the creep behavior and predicting the creep life. The creep rupture stress at 20,000 h decreased significantly with the increase in the temperature in the tested temperature range. The cavitation in the 15CrMoG steel samples occurring during the creep tests was also examined by microscopic analysis, the results of which confirmed that the cavitation evolution is responsible for the reduced mechanical performance and finally creep rupture of the steel. This work provides valuable high-temperature creep data of the 15CrMoG heat-resistant steel and insights into evaluation and prediction of long-term creep behavior at high temperatures.
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Uludag, Alper, and Dilek Turan. "SiAlON Ceramics for the High Temperature Applications: High Temperature Creep Behavior." International Journal of Materials, Mechanics and Manufacturing 3, no. 2 (2015): 105–9. http://dx.doi.org/10.7763/ijmmm.2015.v3.176.

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LIU, JI-HONG, XIANG-QI MENG, and JIN-QUAN XU. "CREEP CONSTITUTIVE RELATIONSHIPS AND CYCLIC BEHAVIORS OF Sn96.5Ag3Cu0.5 UNDER HIGH TEMPERATURES." International Journal of Modern Physics B 22, no. 31n32 (December 30, 2008): 5438–44. http://dx.doi.org/10.1142/s0217979208050620.

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As a lead-free solder, Sn 96.5 Ag 3 Cu 0.5 has a wide application in electronic packaging. Since the solder materials usually work under cyclic temperature surroundings, creep constitutive relationships and cyclic behaviors are necessary to carry out the thermal stress analysis of a package with such a solder for its strength and life evaluations. This paper has investigated the creep constitutive relationships by constant (non-cyclic) loadings firstly, based on the creep test results at various stress and temperature levels. The complete form of the constitutive relationship containing both the linear viscous and hyperbola-sine creeps is proposed. Secondly, through the tests under cyclic stress loadings, the cyclic stress-strain relationships have been illustrated.
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Cao, Shuo, Yong Li, Jia Lin Sun, Hao Bo Zhang, Yong Qiang Sun, Yan Jing Li, Chang He Gao, and Ji Li Zhang. "Investigation on High-Temperature Creep Properties of High-Alumina Bauxite." Key Engineering Materials 680 (February 2016): 347–51. http://dx.doi.org/10.4028/www.scientific.net/kem.680.347.

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This paper studied the high temperature creep properties of high-alumina bauxite (the mass fraction of Al2O3 in the new ore is about 78, the following abbreviations for Al2O3~78). The results indicated that the Al2O3~78 high-alumina bauxite mainly are corundum phase after high temperature sintered.When the temperature is 1100°C, corundum exists as crystal phase and the connections between grains are directly. The creep resistance of samples is very good at this temperature and the creep rate of 50 hours heat preservation is-0.266%. When the temperature is 1200°C, liquid phase starts to produce in a large number and the creep rate in 50 hours heat preservation is-1.589%. When the temperature is 1300°C, because of the further increase on the amount of liquid phase and wetting coated corundum particle, the direct connections between corundum particles are broken and the creep resistance is greatly reduced, the creep rate in 50 hours heat preservation is-4.088%. The creep curve fitting after 25 hours indicated that the creep property shows linear relations in three different temperatures after 25 hours. When the temperature is 1200°C and 1300°C, the creep variables arise rapidly in linear which declare the creep resistance of corundum is poor and increasing with temperature go up, more corundum phase is covered by glass phase and the creep resistance reduces dramatically.
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Stevens, T. E., J. C. Moosbrugger, and F. M. Carlson. "Creep of CdZnTe at high homologous temperatures." Journal of Materials Research 14, no. 10 (October 1999): 3864–69. http://dx.doi.org/10.1557/jmr.1999.0522.

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The creep behavior of single-crystal Zn-doped CdTe was examined in the small strain regime. Specimens from two different sources, with tensile axes [110] and [112], were deformed at 1073 and 1173 K. Strain rates were of order 10−6 to 10−7 s−1. A laser interferometer was constructed to measure the small sample displacement. Cadmium overpressure was used to inhibit sublimation of test specimens at elevated temperatures. Some tests showed a transition from secondary to tertiary creep at low levels of strain. An activation energy for steady-state creep was calculated as QC = 1.46 eV, and the creep exponent was found to be approximately n = 4.2. These results, coupled with reported activation energies for self-diffusion of Cd in Cd(Zn)Te, indicate a dislocation creep mechanism. Etch pit density was measured before and after deformation and approached a common level regardless of initial etch pit density.
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Fischer, Bernd, Manuel Beschliesser, Andreas Hoffmann, and Stefan Vorberg. "Mechanical Properties of Refractory Metals at Extremely High Temperatures." Materials Science Forum 534-536 (January 2007): 1269–72. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1269.

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Driven by the unavailibility of commercial test equipment for tensile and creep testing at temperatures up to 3000°C a measuring system has been developed and constructed at the University of Applied Sciences, Jena. These temperatures are reached with precision by heating samples directly by electric current. Contact-less strain measurements are carried out with image processing software utilizing a CCD camera system. This paper covers results of creep tests which have been conducted on TZM sheet material (thickness 2 mm) in the temperature range between 1200°C and 1600°C. It is the aim of this work to show the influence of heat-treatment conditions on creep performance in the investigated temperature range.
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Du, Xing Hao, Guang Ye Zhang, and Jian Ting Guo. "Microstructure and High-Temperature Creep Behavior of NiAl-25 at.% Cr Intermetallic Compound." Materials Science Forum 475-479 (January 2005): 771–74. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.771.

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The creep behavior and mechanisms of extruded NiAl-25Cr alloy at elevated temperatures have been studied in the paper. Analysis of the creep data over the temperature range 1073-1123 K reveals two distinct regions of creep behavior present in this material. At lower temperature, the creep characteristics are consistent with mobility-controlled deformation where viscous glide of dislocations controls creep. At higher temperature, the creep characteristics are consistent with a structure controlled creep process where some form of dislocation climb controls creep deformation.
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Torić, Neno, Alen Harapin, and Ivica Boko. "Modelling of Steel Creep at High Temperatures Using an Implicit Creep Model." Key Engineering Materials 553 (June 2013): 13–22. http://dx.doi.org/10.4028/www.scientific.net/kem.553.13.

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The paper presents the numerical procedure for modelling the behaviour of steel structures at high temperatures using a newly developed implicit creep model. This implicit creep model uses the calculated creep strains to modify the material stress-strain curves, thus implicitly taking into account the effect of the developed creep strain. The newly calculated stress-strain curves are modified by stretching the initial temperature-dependent stress-strain curves using the calculated values of the creep strain which depend on the level of temperature and stress that the section of structure is being exposed to during fire. The implicit numerical procedure has been implemented in a previously developed numerical model for predicting the behaviour of structures under fire. In order to test the validity of the newly developed implicit creep model, an in-house fire experiment was performed. Results of the experiment have shown a good agreement with the model predictions indicating the validity of the developed implicit numerical procedure.
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Kang, You Bin, Kap Ho Lee, and Sun Ig Hong. "Creep Behaviors of CrMnFeCoNi High Entropy Alloy at Intermediate Temperatures." Key Engineering Materials 737 (June 2017): 21–26. http://dx.doi.org/10.4028/www.scientific.net/kem.737.21.

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In this study, creep properties and fracture behavior of CrMnFeCoNi high entropy alloy (HEA) were studied at intermediate temperatures. The invert-type transient primary creep behaviors were observed in CrMnFeCoNi high entropy alloy. Creep behaviors of HEA are similar to those of class I solid solution alloys. The transient creep curves upon increase of stress by 5MPa in the steady state creep region did not change much except the sudden strain increase. And, no decrease of creep rate was observed upon increase of stress. Instead, the slightly invert transient creep or almost straight creep curves were observed, supporting the high friction stress. CrMnFeCoNi high entropy alloy has a stress exponent of 3.75 and the creep activation energy was calculated to be 278KJ/mole. The fracture strain increased from 1.3 to 1.6 with the decrease of stress from 96 MPa to 48MPa. The lower stress exponent along with the invert type primary creep curves strongly suggest that the creep of CrMnFeCoNi high entropy alloy at 600°C~650°C occurs by a glide controlled process.
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Pan, Jin Ping, Shu Heng Tu, Ding Jun Chu, Xin Wei Zhu, Bin Hu, and Lian Jiang Tan. "Study on High-Temperature Creep Behavior of T23 and T24 Steels." Key Engineering Materials 789 (November 2018): 182–86. http://dx.doi.org/10.4028/www.scientific.net/kem.789.182.

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A progressive increase of plant efficiency calls for new requirements of heat-resistantsteels used in the boiler and piping systems. In this paper, high-temperature creep behavior of T23and T24 steels were studied. Creep tests over a long period of time have been conducted for bothsteels at different temperatures. The creep mechanisms of the two steels have been clarified byanalyzing the minimum creep rate versus stress data. Besides, the creep rupture data from the creeptests were in good accordance with theoretical simulation on the basis of the CDM model over a longtime. Creep temperature has great effects on the rupture strength of the two steels. By creep ruptureexperiments and appropriate modelling, the high-temperature creep behavior can be well described.
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Dissertations / Theses on the topic "Creep at high temperatures"

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Abdallah, Zakaria. "Creep lifing methods for components under high temperature creep." Thesis, Swansea University, 2010. https://cronfa.swan.ac.uk/Record/cronfa43065.

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Buttram, Jonathan D. "Characterization of high temperature creep in siliconized silicon carbide using ultrasonic techniques." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040453/.

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Cain, Victoria. "High temperature creep behaviour niobium bearing ferritic stainless steels." Thesis, Cape Peninsula University of Technology, 2005. http://hdl.handle.net/20.500.11838/1249.

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A thesis submitted to the Faculty of Engineering in fulfilment of the requirements for the degree of Master of Technology in Mechanical Engineering 2005
The objective of this project was to monitor the high temperature creep behaviour of 441 stainless steel. Two different alloys of 441 were investigated; the main difference between them being the Niobium content. Particularly imporlant to the project was how the Niobium content and grain size affected the creep resistance of the material. Creep tests were performed using purpose built constant load creep test rigs. Initially the rigs were not suitable for the testing procedures pertaining to this project. This was due to persistent problems being experienced with regards the reliability and reproducibility of the rigs. After various modifications were made the results produced from the rigs were consistent. Creep test data was used in order to determine the mechanism of creep that is operative within the material (at a predetermined temperature) under a predetermined load. Particular attention was paid to the resulting stress exponents. in order to identify the operative creep mechanism. The identification of the operative creep mechanisms was also aided by microscopical analysis. This analysis was also necessary to monitor how the grain size had altered at various annealing temperatures. Heat treatment was used as a method to alter the high temperature strength and microstructure of the material. Heat treatments were performed at various temperatures in order to determine the ideal temperature to promote optimum creep resistance of 441. All heat treatments were performed in a purpose designed and built high temperature salt bath furnace. The commissioning of the salt bath formed part of the objectives for this project. Sag testing was also conducted, using purpose built sag test rigs. It was necessary to design and manufacture a sag test rig that could be comparable to the industry accepted method of sag testing known as the two-point beam method, as this method is believed to produce inconsistent results. Conclusions have been drawn from the results of the data and from previous research on the subject matter.
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Palmer, C. J. "High temperature creep of copper." Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638403.

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The key observations that have underpinned traditional power law approaches to creep mechanism identification have been re-evaluated using information obtained for pure copper and aluminium, and also for various other metals and alloys. Specifically, data is presented which show stress/creep rate plots for copper and aluminium over extended stress ranges to be well represented by continuous curves, contradicting the common assumption that a transition in mechanisms occurs as the stress is reduced. Data is also presented from a series of stress interruption tests on pure copper, with strain/strain rate responses which also suggest that essentially the same mechanism dominates creep behaviour at high and low stresses. Furthermore, results for copper single crystals and polycrystals are shown which contradict the assumption that dislocation creep processes are grain size independent so the creep rate increases rapidly with decreasing grain diameter only when diffusional mechanisms are dominant at low stresses. Evidence is also introduced to demonstrate that the theoretical and practical limitations of power-law descriptions of steady-state creep rates can be overcome by quantifying the shapes of normal creep curves and the variations in curve shape with changing stress conditions. The superior predictive capabilities of curve shape analysis are then illustrated by results showing accurate predictions of creep behaviour in the low stress region may be obtained from data generated experimentally at far high stresses. Finally, results are presented showing the effects of a range of room temperature prestrains which illustrate the importance of distinguishing between the contributions made by the grain interiors and the grain boundary zones to the overall rates of strain accumulation during creep.
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Everitt, Nicola Mary. "Indentation creep and anisotropy in magnesium oxide and germanium." Thesis, University of Oxford, 1990. http://ora.ox.ac.uk/objects/uuid:91bd9f5d-f6e9-4f8f-8108-e160ae8c500a.

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Hardness tests have the potential to provide a simple means of investigating the mechanical properties of materials, both at room temperature, and at higher temperatures. However, the information gained can not be fully utilized unless the deformation processes and variables are properly understood. Careful consideration of such deformation on single crystals can help to clarify the situation and lead to better understanding. This thesis describes indentation experiments on (001) MgO and Ge at temperatures up to 1175°C and 700°C respectively. Since anisotropy was one of the questions being addressed, the majority of the testing used Knoop indenters, although a few experiments used Vickers indenters. The work was carried out on a specially commissioned high temperature hardness tester (based on an original design by Wilberforce Scientific Developments). A main conclusion of the discussion on the design of high temperature hardness testers is the importance of independent heating of the indenter for accurate hardness results. The indentation behaviour of MgO was shown to include creep, even at room temperature for the Knoop <110> orientation. However a region of no indentation creep was exhibited between 750°C and 1050°C for both Vickers and Knoop indentations. This has not been reported in previous studies. The anisotropy displayed at room temperature between <110> and <100> Knoop decreased with increasing temperature, due to the faster creep rate of the < 110> orientation, and finally reversed. Knoop indentations in the <110> and <100> orientations on Ge also showed hardness anisotropy which changed with temperature. In this case there was no anisotropy at room temperature, but anisotropy developed as the temperature increased due to the faster creep rate of the <110> orientation. The indentation hardness response of both MgO and Ge is explained in terms of the interaction of dislocation arrays which are formed in the first few moments of the indentation. Measurement of the two diagonals of the Knoop indentations showed that the ratio of the diagonal lengths, and also the morphology of the surrounding material, can be used to examine the extent and direction of material displacement. Surface etching, and etching of sections, were used to analyse the disposition of slip around the indentations.
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Staley, James T. "Mechanisms of creep crack growth in a Cu-1 wt.% Sb alloy." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/10098.

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POWERS, LYNN MARIE. "Mechanical Behavior of Ceramics at High Temperatures: Constitutive Modeling and Numerical Implementation." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1149816510.

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Gardiner, Benjamin Robert. "High temperature creep performance of alloy 800H." Thesis, University of Canterbury. Mechanical, 2014. http://hdl.handle.net/10092/9949.

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Investigations on post service material showed that Alloy 800H pigtails from methanol producer Methanex have service lives ranging from 3 to 18 years. Because of this variability in service life, Alloy 800H creep performance was assessed and a new criterion for its procurement developed. The current criterion recommends an ASTM grain size of 5 (72µm) or coarser with no consideration given to grain size distribution, grain boundary types, or grain boundary network topology. Results from the investigation showed that this current criterion may produce variations in steady state creep rates of an order of magnitude between ASTM grain size 1 and 5, and a 2.5 times variation in creep ductility. The ability to accurately reveal grain boundaries and assess grain boundary types is fundamental to the identification and quantification of coherent twin boundaries, and the measurement of average grain size and grain size distribution. EBSD mapping has the ability to distinguish grain boundary types using crystal orientation measurement. Grain size measurement from optical micrographs relies on morphological indicators to identify coherent twins. However, it is shown that many of the boundaries observed as straight line morphology on 2D sections did not possess {111} (coherent) interfaces. 3D reconstructions of Alloy 800H revealed the deficiencies in classifying geometry from two-dimensional (2D) sections. Σ3 Crystal volumes can be categorized as lamellar or edge structures. Lamellar structures are characterized by the appearance of parallel Σ3 boundary planes while an edge structure contains a single Σ3 interface. Sectioning plane location alters the perception of morphology. For simple twin structures, the tradition 2D classifications of morphology (complete parallel, incomplete parallel and corner Σ3) may all appear on a section plane from a single lamellar structure.
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Mirmasoudi, Sara. "High Temperature Transient Creep Analysis of Metals." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1452693927.

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Halverson, Howard Gerhard. "Durability of Ceramic Matrix Composites at Elevated Temperatures: Experimental Studies and Predictive Modeling." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27834.

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In this work, the deformation and strength of an oxide/oxide ceramic matrix composite system under stress-rupture conditions were studied both experimentally and analytically. A rupture model for unidirectional composites which incorporates fiber strength statistics, fiber degradation, and matrix damage was derived. The model is based on a micromechanical analysis of the stress state in a fiber near a matrix crack and includes the effects of fiber pullout and global load sharing from broken to unbroken fibers. The parameters required to produce the deformation and lifetime predictions can all be obtained independently of stress-rupture testing through quasi-static tension tests and tests on the individual composite constituents. Thus the model is truly predictive in nature. The predictions from the model were compared to the results of an extensive experimental program. The model captures the trends in steady-state creep and tertiary creep but the lifetime predictions are extremely conservative. The model was further extended to the behavior of cross-ply or woven materials through the use of numeric representations of the fiber stresses as the fibers bridge matrix cracks. Comparison to experiments on woven materials demonstrated the relationship between the behavior of the unidirectional and cross-ply geometries. Finally, an empirical method for predicting the durability of materials which exhibit multiple damage modes is examined and compared to results of accurate Monte Carlo simulations. Such an empirical method is necessary for the durability analysis of large structural members with varying stress and temperature fields over individual components. These analyses typically require the use of finite element methods, but the extensive computations required in micromechanical models render them impractical. The simple method examined in this work, however, is shown to have applicability only over a narrow range of material properties.
Ph. D.
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Books on the topic "Creep at high temperatures"

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Fracture at high temperatures. Berlin: Springer-Verlag, 1987.

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Webster, G. A. High temperature component life assessment. London: Chapman & Hall, 1994.

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Creep of crystals: High-temperature deformation processes in metals, ceramics, and minerals. Cambridge [Cambridgeshire]: Cambridge University Press, 1985.

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International Conference on Creep and Fatigue (6th 1996). Sixth International Conference on Creep and Fatigue: Design and life assessment at high temperature : 15-17 April 1996. Bury St. Edmunds): Mechanical Engineering Publications for the Institution of Mechanical Engineers, 1996.

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Rishi, Raj, and American Society for Metals. Materials Science Division. Seminar Committee., eds. Flow and fracture at elevated temperatures: Papers presented at the 1983 ASM Materials Science Seminar, 1-2 October 1983, Philadelphia, Pennsylvania. Metals Park, Ohio: ASM, 1985.

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Hanhjijarvi, Antti. Perpendicular-to-grain creep of Finnish softwoods in high temperature drying conditions: Experiments and modelling in temperature range 95-125 [degree] C. Espoo, Finland: VTT, Technical Research Centre of Finland, 1997.

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L, Ellis D. A new Cu-8 Cr-4 Nb alloy for high temperature applications. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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L, Ellis D. A new Cu-8 Cr-4 Nb alloy for high temperature applications. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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L, Ellis D. A new Cu-8 Cr-4 Nb alloy for high temperature applications. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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L, Ellis D. A new Cu-8 Cr-4 Nb alloy for high temperature applications. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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Book chapters on the topic "Creep at high temperatures"

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Riedel, Hermann. "Diffusion Creep." In Fracture at High Temperatures, 346–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_26.

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Riedel, Hermann. "Primary-Creep Effects." In Fracture at High Temperatures, 332–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_25.

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Riedel, Hermann. "Creep-Fatigue Crack Growth." In Fracture at High Temperatures, 364–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_28.

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Riedel, Hermann. "Nucleation of Creep Cavities/Basic Theories." In Fracture at High Temperatures, 67–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_6.

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Riedel, Hermann. "Grain Boundary Cavitation Under Creep-Fatigue Conditions." In Fracture at High Temperatures, 247–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_18.

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Riedel, Hermann. "Cavity Nucleation by Stress Concentrations During Creep." In Fracture at High Temperatures, 85–115. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_7.

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Riedel, Hermann. "Summary of the Deformation Behavior Under Creep Conditions." In Fracture at High Temperatures, 3–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_1.

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Riedel, Hermann. "Creep-Enhanced Diffusive Cavity Growth and Elastic Accommodation." In Fracture at High Temperatures, 215–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_15.

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Riedel, Hermann. "Introduction to Creep Fracture and Other Fracture Modes." In Fracture at High Temperatures, 14–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_2.

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Riedel, Hermann. "A Damage Mechanics Approach to Creep Crack Growth." In Fracture at High Temperatures, 349–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82961-1_27.

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Conference papers on the topic "Creep at high temperatures"

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Mann, J. Adin, Jeremy Hilsabeck, Cale Mckoon, and Courtnee Jackson. "Bolted Flanged Joint Creep/Relaxation Results at High Temperatures." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28261.

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An ASME Class 300 NPS12 flange connection between a control valve and a pipe has been evaluated at a temperature of 1100° F with testing and Finite Element Analysis (FEA). The goal of the testing was to validate the FEA simulation. The valve side of the test sample was a cast structure, the pipe side was a forged flange butt welded to a pipe section, and the gasket was a Thermiculite filled spiral wound gasket. The valve, flange, and piping material are SA-217, SA-182, and SA-335 (2 ¼ Cr – 1 Mo) steel respectively. The bolt length and flange geometry was measured before and after loading the bolts, and before and after heating the sample in order to measure changes in the bolt load and flange rotation which would indicate creep/relaxation in the joint. Tests were run with two types of bolts, B16 (SA-193) and 718 (SB-637), and also with two gasket arrangements, no gasket and then a spiral wound gasket. The results of the completed test and the correlation to an FEA analysis will be presented.
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Ali, Balhassn S. M. "Creep Assessment of Large Size High Temperature Components Using Small Creep Test Specimens." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60010.

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Most of the large components in the thermal, traditional and nuclear power plants such as pressurized vessels and pipes are operating at elevated temperatures. These temperatures and stress are high enough for creep to occur. For variety of reasons many of these power plants are now operating beyond their design life time. It is -known fact that as the high temperature components aged the failure rate normally increases as a result of their time dependent material damage. Further running of these components may become un-safe and dangerous in some cases. Therefore, creep assessment of the high temperature components of these plants is essential for their safe operation. Mainly for economic reasons these components have to be creep assessed as they are in service. However, assessing the creep strength for these high temperature components as they are in service, it can be challenging task, especially when these components are operating under extremely high temperature and/or stress. This paper introduces newly invented, small creep test specimens techniques. These new small types of specimens can be used to assess the remaining life times for the high temperature components, using only small material samples. These small material samples can be removed from the operating components surface, without affecting their safe operation. Two of the high temperature materials are used to validate the new testing techniques.
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Pritchard, P. G., L. Carroll, and T. Hassan. "Constitutive Modeling of High Temperature Uniaxial Creep-Fatigue and Creep-Ratcheting Responses of Alloy 617." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97251.

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Inconel Alloy 617 is a high temperature creep and corrosion resistant alloy and is a leading candidate for use in Intermediate Heat Exchangers (IHX) of the Next Generation Nuclear Plants (NGNP). The IHX of the NGNP is expected to experience operating temperatures in the range of 800°–950°C, which is in the creep regime of Alloy 617. A broad set of uniaxial, low-cycle fatigue, fatigue-creep, ratcheting, and ratcheting-creep experiments are conducted in order to study the fatigue and ratcheting responses, and their interactions with the creep response at high temperatures. A unified constitutive model developed at North Carolina State University is used to simulate these experimental responses. The model is developed based on the Chaboche viscoplastic model framework. It includes cyclic hardening/softening, strain rate dependence, strain range dependence, static and dynamic recovery modeling features. For simulation of the alloy 617 responses, new techniques of model parameter determination are developed for optimized simulations. This paper compares the experimental responses and model simulations for demonstrating the strengths and shortcomings of the model.
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LIU, JI-HONG, XIANG-QI MENG, and JIN-QUAN XU. "CREEP CONSTITUTIVE RELATIONSHIPS AND CYCLIC BEHAVIORS OF Sn96.5Ag3Cu0.5 UNDER HIGH TEMPERATURES." In Proceedings of the 9th AEPA2008. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814261579_0011.

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O’Donnell, William J., Amy B. Hull, and Shah Malik. "Structural Integrity Code and Regulatory Issues in the Design of High Temperature Reactors." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58061.

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Since the 1980s, the ASME Code has made numerous improvements in elevated-temperature structural integrity technology. These advances have been incorporated into Section II, Section VIII, Code Cases, and particularly Subsection NH of Section III of the Code, “Components in Elevated Temperature Service.” The current need for designs for very high temperature and for Gen IV systems requires the extension of operating temperatures from about 1400°F (760°C) to about 1742°F (950°C) where creep effects limit structural integrity, safe allowable operating conditions, and design life. Materials that are more creep and corrosive resistant are needed for these higher operating temperatures. Material models are required for cyclic design analyses. Allowable strains, creep fatigue and creep rupture interaction evaluation methods are needed to provide assurance of structural integrity for such very high temperature applications. Current ASME Section III design criteria for lower operating temperature reactors are intended to prevent through-wall cracking and leaking and corresponding criteria are needed for high temperature reactors. Subsection NH of Section III was originally developed to provide structural design criteria and limits for elevated-temperature design of Liquid-Metal Fast Breeder Reactor (LMFBR) systems and some gas-cooled systems. The U.S. Nuclear Regulatory Commission (NRC) and its Advisory Committee for Reactor Safeguards (ACRS) reviewed the design limits and procedures in the process of reviewing the Clinch River Breeder Reactor (CRBR) for a construction permit in the late 1970s and early 1980s, and identified issues that needed resolution. In the years since then, the NRC, DOE and various contractors have evaluated the applicability of the ASME Code and Code Cases to high-temperature reactor designs such as the VHTGRs, and identified issues that need to be resolved to provide a regulatory basis for licensing. The design lifetime of Gen IV Reactors is expected to be 60 years. Additional materials including Alloy 617 and Hastelloy X need to be fully characterized. Environmental degradation effects, especially impure helium and those noted herein, need to be adequately considered. Since cyclic finite element creep analyses will be used to quantify creep rupture, creep fatigue, creep ratcheting and strain accumulations, creep behavior models and constitutive relations are needed for cyclic creep loading. Such strain- and time-hardening models must account for the interaction between the time-independent and time-dependent material response. This paper describes the evolving structural integrity evaluation approach for high temperature reactors. Evaluation methods are discussed, including simplified analysis methods, detailed analyses of localized areas, and validation needs. Regulatory issues including weldment cracking, notch weakening, creep fatigue/creep rupture damage interactions, and materials property representations for cyclic creep behavior are also covered.
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Jiang, Wei, Yong Yuan, and Zhenghong Yang. "Creep Behaviour of Concrete Structures under Lower High Temperatures (80∼240 °C)." In 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479346.185.

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Jo, Byeongnam, Wataru Sagawa, and Koji Okamoto. "Buckling Behaviors of Metallic Columns Under Compressive Load at Extremely High Temperatures." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28683.

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This study aims to investigate buckling behaviors of a slender stainless steel column under compressive loads in severe accident conditions, which addresses the accidents in Fukushima Daiichi nuclear power plants. Firstly, buckling load, defined a load which generates a failure of the column (plastic collapse) was experimentally measured in a wide range of temperatures from 25 °C up to 1200 °C. The buckling load values measured were compared to numerical estimations for both an ideal column and for a column initially bent. Secondly, creep buckling tests were also performed for extremely high temperatures (800 °C, 900 °C, and 1000 °C). Creep buckling was found to occur very quickly compared to general creep times under tensile stresses. Time to creep buckling was exponentially increased with decrease of loads applied. Lateral deflection of a test column was estimated using captured images by a high speed camera. It was suggested to represent creep buckling behaviors as a time-lateral deflection curve. Moreover, an empirical correlation was developed to predict creep buckling time, based on the Larson-Miller model with experimental results obtained in present study.
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Sham, T. L., Robert I. Jetter, and Daniel R. Eno. "Creep Effects on Design Below the Temperature Limits of ASME Section III Subsection NB." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58281.

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Some recent studies of material response have identified an issue that crosses over and blurs the boundary between ASME Boiler and Pressure Vessel Code Section III Subsection NB and Subsection NH. For very long design lives, the effects of creep show up at lower and lower temperature as the design life increases. Although true for the temperature at which the allowable stress is governed by creep properties, the effect is more apparent, e.g. creep effects show up sooner, at local structural discontinuities and peak thermal stress locations. This is because creep is a function of time, temperature and stress and the higher the localized stress, the lower in temperature creep begins to cause damage. If the threshold is below the Subsection NB to NH temperature boundary, 700°F for ferritic steels and 800°F for austenitic materials, then this potential failure mode will not be considered. Unfortunately, there is no experience base with very long lives at temperatures close to but under the Subsection NB to NH boundary to draw upon. This issue is of particular interest in the application of Subsection NB rules of construction to some High Temperature Gas Reactor (HTGR) concepts. The purpose of this paper is, thus, twofold; one part is about statistical treatment and extrapolation of sparse data for a specific material of interest, A533B; the other part is about how these results could impact current design procedures in Subsection NB.
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Razdolsky, L. "High Temperature Creep and Structural Fire Resistance." In Structures Congress 2015. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479117.182.

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Cao, C. M., J. Xu, Y. X. Hao, W. Tong, and L. M. Peng. "High-Temperature Creep Behavior of AlxCrMnFeCoNi High-Entropy Alloys." In The International Workshop on Materials, Chemistry and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007434700710076.

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Reports on the topic "Creep at high temperatures"

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Feldman, L. A., and T. B. Bahder. High-Temperature Creep Under a Nonuniform Temperature Distribution,. Fort Belvoir, VA: Defense Technical Information Center, May 1989. http://dx.doi.org/10.21236/ada310380.

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McGee, T. D. High temperature creep of refractory bricks. Final report. Office of Scientific and Technical Information (OSTI), May 1991. http://dx.doi.org/10.2172/10151299.

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Bewlay, Bernard P., Melvin R. Jackson, and Clyde L. Briant. Creep Mechanisms in High-Temperature In-Situ Composites. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada369335.

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Sutton, Michael A., Bill Y. Chao, Xiaomin Deng, and Jed S. Lyons. Creep, Damage and Life Prediction for High Temperature Materials. Fort Belvoir, VA: Defense Technical Information Center, December 1997. http://dx.doi.org/10.21236/ada340457.

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Deibler, Lisa Anne, and John Robert Laing. High fidelity measurement of room temperature creep in NW alloys. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1221948.

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Hyers, Robert W. Non-contact Measurement of Creep in Ultra-High-Temperature Materials. Fort Belvoir, VA: Defense Technical Information Center, November 2009. http://dx.doi.org/10.21236/ada524249.

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Lewinsohn, C. A., R. H. Jones, G. E. Youngblood, and C. H. Henager, Jr. Fiber creep rate and high-temperature properties of SiC/SiC composites. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/335384.

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Feldman, L. A. Residual Stress and High-Temperature Creep Behavior in Carbon-Carbon Composites,. Fort Belvoir, VA: Defense Technical Information Center, September 1987. http://dx.doi.org/10.21236/ada302261.

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Stewart, Calvin, Jacob Pellicotte, Md Abir Hossain, Jaime Cano, Robert Mach, and Ricardo Vega. An Accelerated Creep Testing (ACT) Program for Advanced Creep Resistant Alloys for High Temperature Fossil Energy (FE) Applications. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1797791.

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Karakus, M., T. P. Kirkland, K. C. Liu, R. E. Moore, B. A. Pint, and A. A. Wereszczak. Compressive Creep Performance and High Temperature Dimensional Stability of Conventional Silica Refractories. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/4204.

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