Journal articles: 'Elevated temperature fatigue'

1

Chan, K. S., and G. R. Leverant. "Elevated-temperature fatigue crack growth." Metallurgical and Materials Transactions A 18, no. 4 (April 1987): 593–602. http://dx.doi.org/10.1007/bf02649475.

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2

Iwamoto, T., Norio Kawagoishi, Nu Yan, Eiji Kondo, and Kazuhiro Morino. "Fatigue Strength of Maraging Steel at Elevated Temperatures." Key Engineering Materials 385-387 (July 2008): 161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.161.

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Rotating bending fatigue tests were carried out to investigate the effects of temperature on the fatigue strength and the fracture mechanism of an 18 % Ni maraging steel at room and elevated temperatures of 473K and 673K. Fatigue strength was higher at elevated temperatures than at room temperature, though static strength was decreased by softening at elevated temperature. There was no effect of temperature on crack morphology and fracture mechanism. On the other hand, during fatigue process at elevated temperature, the specimen was age-hardened and the specimen surface was oxide. That is, the increase in fatigue strength at elevated temperature was mainly caused by the increase in hardness due to age-hardening and suppression of a crack initiation due to surface oxidation.

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3

Aigner, Roman, Christian Garb, Martin Leitner, Michael Stoschka, and Florian Grün. "Application of a √ area -Approach for Fatigue Assessment of Cast Aluminum Alloys at Elevated Temperature." Metals 8, no. 12 (December 6, 2018): 1033. http://dx.doi.org/10.3390/met8121033.

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This paper contributes to the effect of elevated temperature on the fatigue strength of common aluminum cast alloys EN AC-46200 and EN AC-45500. The examination covers both static as well as cyclic fatigue investigations to study the damage mechanism of the as-cast and post-heat-treated alloys. The investigated fracture surfaces suggest a change in crack origin at elevated temperature of 150 ∘ C. At room temperature, most fatigue tests reveal shrinkage-based micro pores as their crack initiation, whereas large slipping areas occur at elevated temperature. Finally, a modified a r e a -based fatigue strength model for elevated temperatures is proposed. The original a r e a model was developed by Murakami and uses the square root of the projected area of fatigue fracture-initiating defects to correlate with the fatigue strength at room temperature. The adopted concept reveals a proper fit for the fatigue assessment of cast Al-Si materials at elevated temperatures; in detail, the slope of the original model according to Murakami should be decreased at higher temperatures as the spatial extent of casting imperfections becomes less dominant at elevated temperatures. This goes along with the increased long crack threshold at higher operating temperature conditions.

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4

Yamamoto, S., K. Isobe, S. Ohte, N. Tanaka, S. Ozaki, and K. Kimura. "Fatigue and Creep-Fatigue Testing of Bellows at Elevated Temperature." Journal of Pressure Vessel Technology 110, no. 3 (August 1, 1988): 301–7. http://dx.doi.org/10.1115/1.3265603.

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Fatigue and creep-fatigue tests at elevated temperature were conducted on two different-sized bellows, φ 1100 mm and φ 300 mm in nominal inner diameter, to investigate the fatigue life and the creep-fatigue interaction in a bellows, and also to provide test data for developing a life prediction method and design-by-analysis rules for bellows in elevated temperature service. A series of tests consisted of strain behavior and fatigue tests at room temperature, and fatigue and creep-fatigue tests at elevated temperature. Also, inelastic finite element analyses were performed on a bellows under internal pressure and cyclic axial deflections. Analytical results were compared with the measured data obtained in the room temperature testing to verify the strain prediction method.

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KAWAGOISHI, Norio, Kenji SHIMANA, Yoshihisa OHZONO, Hironobu NISITANI, Masahiro GOTO, and Eiji KONDO. "Fatigue Strength of ODSC at Elevated Temperature." Proceedings of the 1992 Annual Meeting of JSME/MMD 2000 (2000): 425–26. http://dx.doi.org/10.1299/jsmezairiki.2000.0_425.

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GORDON, D. E., C. K. Unni, and N. S. STOLOFF. "ELEVATED TEMPERATURE FATIGUE IN Ni3Al-BASED ALLOYS." Fatigue & Fracture of Engineering Materials and Structures 17, no. 9 (September 1994): 1025–32. http://dx.doi.org/10.1111/j.1460-2695.1994.tb00831.x.

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7

Miyazawa, Yuta, Yuichi Otsuka, Yoshiharu Mutoh, and Kohsoku Nagata. "OS12-4-4 Fatigue Crack Growth Characteristics of Epoxy Resin Reinforced by Silica Particles at Ambient Temperature and Elevated Temperatures." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011.10 (2011): _OS12–4–4—. http://dx.doi.org/10.1299/jsmeatem.2011.10._os12-4-4-.

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Hashimura, Shinji, Tetsuya Torii, and Takefumi Otsu. "Fatigue Characteristics of Nonferrous Bolts at Elevated Temperature." Key Engineering Materials 627 (September 2014): 265–68. http://dx.doi.org/10.4028/www.scientific.net/kem.627.265.

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In order to investigate fatigue characteristics of nonferrous bolts at elevated temperature, fatigue tests of bolted joints which were tightened with three kinds of nonferrous bolts were been conducted at 100°C atmosphere. The test bolts were made of A5056 aluminum alloy and AZ31 and AZX912 magnesium alloy. Creep tests of the bolts at 100°C atmosphere were also conducted. The results showed that the fatigue limit of A5056 bolt was the highest of all regardless of the ambient temperature. The fatigue limits of AZ31 bolt and AZX912 bolt also were a half of the fatigue limit of A5056 bolt at both ambient temperature. Bolt clamping force losses due to creep deformation were observed for all bolts during fatigue tests at elevated temperature. Hence as additional tests, the creep tests which was controlled either the tensile force or the displacements respectively were conducted. As the results it was seen that the clamping force losses for all bolts were remarkably large although the each creep deformation was different for each bolt material. Therefore the results indicates that we have to pay attention to the clamping force reduction due to creep deformation if we use the nonferrous bolt in high temperature.

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9

Akita, Masayuki, Masaki Nakajima, Yoshihiko Uematsu, and Keiro Tokaji. "Fatigue Behaviour of Type 444 Stainless Steel at Elevated Temperatures." Key Engineering Materials 345-346 (August 2007): 263–66. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.263.

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This paper describes the fatigue behaviour at elevated temperatures in a ferritic stainless steel, type 444. Test temperatures evaluated were ambient temperature, 673K and 773K in laboratory air. Fatigue strength decreased at elevated temperatures compared with at ambient temperature. At all temperatures, cracks were generated at the specimen surface due to cyclic slip deformation, but fractographic analysis revealed a brittle features in fracture surface near the crack initiation site at elevated temperatures. Cracks initiated earlier at elevated temperatures than at ambient temperature and subsequent small cracks grew faster at elevated temperatures even though the difference in elastic modulus was taken into account, indicating the decrease in crack initiation resistance and crack growth resistance. The observed decrease in both resistances was discussed in relation to the 748K(475C) embrittlement in ferritic stainless steels.

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Elizondo, Adrian, Yukio Miyashita, Yuichi Otsuka, and Shigeharu Kamado. "819 Fatigue crack growth mechanism of extruded Mg-Al-Ca-Mn alloy at elevated temperature." Proceedings of Conference of Hokuriku-Shinetsu Branch 2014.51 (2014): _819–1_—_819–2_. http://dx.doi.org/10.1299/jsmehs.2014.51._819-1_.

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11

Abdullah, Orhan Sabah, Shaker S. Hassan, and Ahmed N. Al-khazraji. "Effect of Elevated Temperature on Bending Fatigue Behavior for Neat and Reinforced Polyamide 6,6." Al-Nahrain Journal for Engineering Sciences 23, no. 3 (November 13, 2020): 232–37. http://dx.doi.org/10.29194/njes.23030232.

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Recently, considering polymer composite in manufacturing of mechanical parts can be caused a fatigue failure due to the very long time of exposure to cyclic loading and may at environmental temperatures higher than their glass transition temperature; therefore, in this paper, a comprehensive investigation for bending fatigue behavior at room and elevated temperatures equal to 60 °C, 70°C, and 80 °C will be done. Rotating bending test machine was manufactured for this purpose supplied with a connected furnace to perform fatigue tests at elevated temperatures. The obtained results appeared that the increase in applied stress and temperature caused a clear reduction in fatigue life; also the addition of carbon nanotubes enhanced the fatigue life at different temperatures by 183%, 205%, 218%, and 240%, respectively while the addition of short carbon fibers improved fatigue life by 324%, 351%, 387%, and 415%, respectively. As well as, Polyamide 6,6/carbon fiber composite appeared fatigue limit at temperatures equal to 20°C and 60°C and stresses approximately equal to 55 MPa and 38 MPa respectively.

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12

Zakaria, K. A., S. Abdullah, Mariyam Jameelah Ghazali, and C. H. Azhari. "Elevated Temperature Fatigue Fracture Behaviour of Aluminium Alloy Subjected to Spectrum Loadings." Applied Mechanics and Materials 165 (April 2012): 219–23. http://dx.doi.org/10.4028/www.scientific.net/amm.165.219.

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This paper discusses the fatigue fracture behaviour of aluminium alloy AA6061-T6 under spectrum loadings at room and elevated temperatures. The load sequence can have a very significant effect in fatigue lives and normally the fatigue strength of material decrease with increasing temperature. In this study, variable amplitude loading (VAL) signal was obtained from the engine mount bracket of an automobile in a normal driving condition. Constant amplitude loading (CAL), high to low and low to high spectrum loadings were then derived from the VAL obtained from the data capturing process to study the fatigue behaviour that subjected to spectrum loadings at the room and elevated temperatures. The fatigue tests were performed according to an ASTM E466 standard using a servo-hydraulic fatigue testing machine. Fatigue fracture surfaces were then sectioned and inspected by employing a high magnification microscope. Results indicated that fracture surface behaviours of specimens were influenced significantly by the load sequence and temperatures, which can be related to the fatigue lives of aluminium alloy under spectrum loadings.

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13

Joyce, M. R., C. M. Styles, and P. A. S. Reed. "Elevated Temperature Fatigue of Al-Si Piston Alloys." Materials Science Forum 396-402 (July 2002): 1261–66. http://dx.doi.org/10.4028/www.scientific.net/msf.396-402.1261.

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14

Berto, F., P. Gallo, S. M. J. Razavi, and M. R. Ayatollahi. "Fatigue behavior of innovative alloys at elevated temperature." Procedia Structural Integrity 3 (2017): 162–67. http://dx.doi.org/10.1016/j.prostr.2017.04.029.

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15

Fine, M. E. "Phase transformation theory applied to elevated temperature fatigue." Scripta Materialia 42, no. 10 (April 2000): 1007–12. http://dx.doi.org/10.1016/s1359-6462(00)00319-5.

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16

MACHIDA, Takashi, and Hiroshi MIYATA. "Fatigue behavior of silicon carbide at elevated temperature." Transactions of the Japan Society of Mechanical Engineers Series A 55, no. 516 (1989): 1701–8. http://dx.doi.org/10.1299/kikaia.55.1701.

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17

REYNOLDS, A. "Elevated temperature fatigue of PM aluminium alloy 8009." International Journal of Fatigue 16, no. 3 (April 1994): 233. http://dx.doi.org/10.1016/0142-1123(94)90067-1.

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18

Bonacuse, Peter J., and Sreeramesh Kalluri. "Elevated Temperature Axial and Torsional Fatigue Behavior of Haynes 188." Journal of Engineering Materials and Technology 117, no. 2 (April 1, 1995): 191–99. http://dx.doi.org/10.1115/1.2804529.

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The results are reported for high-temperature axial and torsional low-cycle fatigue experiments performed at 760° C in air on thin-walled tubular specimens of Haynes 188, a wrought cobalt-base superalloy. Data are also presented for mean coefficient of thermal expansion, elastic modulus, and shear modulus at various temperatures from room to 1000° C, and monotonic and cyclic stress-strain curves in tension and in shear at 760° C. This data set is used to evaluate several multiaxial fatigue life models (most were originally developed for room temperature multiaxial life prediction) including von Mises equivalent strain range (ASME Boiler and Pressure Vessel Code), Manson-Halford, Modified Multiaxiality Factor (proposed in this paper). Modified Smith-Watson-Topper, and Fatemi-Socie-Kurath. At von Mises equivalent strain ranges (the torsional strain range divided by 3, taking the Poisson’s ratio to be 0.5), torsionally strained specimens lasted, on average, factors of 2 to 3 times longer than axially strained specimens. The Modified Multiaxiality Factor approach shows promise as a useful method of estimating torsional fatigue life from axial fatigue data at high temperatures. Several difficulties arose with the specimen geometry and extensometry used in these experiments. Cracking at extensometer probe indentations was a problem at smaller strain ranges. Also, as the largest axial and torsional strain range fatigue tests neared completion, a small amount of specimen buckling was observed.

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19

Lee, Keum Oh, Sam Son Yoon, Soon Bok Lee, and Bum Shin Kim. "Low Cycle Fatigue Behavior of 429EM Ferritic Stainless Steel at Elevated Temperatures." Key Engineering Materials 261-263 (April 2004): 1135–40. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1135.

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In recent, ferritic stainless steels are widely used in high temperature structure because of their high resistance in thermal fatigue and low prices. Tensile and low cycle fatigue(LCF) tests on 429EM stainless steel were performed at several temperatures from room temperature to 600°C. Elastic modulus, yield stress and ultimate tensile strength(UTS) decreased with increasing temperature. Considerable cyclic hardening occurred at 200°C and 400°C. 475°C embrittlement observed could not explain this phenomenon but dynamic strain aging(DSA) observed from 200°C to 500°C could explain the hardening mechanism at 200°C and 400°C. And it was observed that plastic strain energy density(PSED) was useful to predict fatigue life when large cyclic hardening occurred. Fatigue life using PSED over elastic modulus could be well predicted within 2X scatter band at various temperatures.

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20

Hour, K. Y., and J. F. Stubbins. "Fatigue Crack Growth Behavior of Alloy 800H at Elevated Temperature." Journal of Engineering Materials and Technology 113, no. 3 (July 1, 1991): 271–79. http://dx.doi.org/10.1115/1.2903405.

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High temperature crack growth behavior is investigated over a wide range of R-ratios, frequencies, and temperatures in Alloy 800H. It is found that high R-ratio, low frequency, or high temperature can enhance creep damage and thus induce an intergranular crack growth mode. At low frequencies, the nonlinear fracture mechanics parameter, C*, is found to correlate time-dependent fatigue crack growth rate well if the applied mean stress is used in calculating C*. On the other hand, the Paris crack growth law using Keff is proven to be an adequate expression to use when fatigue (time-independent) damage dominates. These conclusions correlate well with damage mechanisms observed from sample fracture surfaces.

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21

Gyekenyesi, A. L. "Isothermal Fatigue Behavior and Damage Modeling of a High Temperature Woven PMC." Journal of Engineering for Gas Turbines and Power 122, no. 1 (October 20, 1999): 62–68. http://dx.doi.org/10.1115/1.483176.

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This study focuses on the fully reversed fatigue behavior exhibited by a carbon fiber/polyimide resin woven laminate at room and elevated temperatures. Nondestructive video edge view microscopy and destructive sectioning techniques were used to study the microscopic damage mechanisms that evolved. The elastic stiffness was monitored and recorded throughout the fatigue life of the coupon. In addition, residual compressive strength tests were conducted on fatigue coupons with various degrees of damage as quantified by stiffness reduction. Experimental results indicated that the monotonic tensile properties were only minimally influenced by temperature, while the monotonic compressive and fully reversed fatigue properties displayed greater reductions due to the elevated temperature. The stiffness degradation, as a function of cycles, consisted of three stages; a short-lived high degradation period, a constant degradation rate segment covering the majority of the life, and a final stage demonstrating an increasing rate of degradation up to failure. Concerning the residual compressive strength tests at room and elevated temperatures, the elevated temperature coupons appeared much more sensitive to damage. At elevated temperatures, coupons experienced a much larger loss in compressive strength when compared to room temperature coupons with equivalent damage. The fatigue damage accumulation law proposed for the model incorporates a scalar representation for damage, but admits a multiaxial, anisotropic evolutionary law. The model predicts the current damage (as quantified by residual stiffness) and remnant life of a composite that has undergone a known load at temperature. The damage/life model is dependent on the applied multiaxial stress state as well as temperature. Comparisons between the model and data showed good predictive capabilities concerning stiffness degradation and cycles to failure. [S0742-4795(00)01001-2]

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22

Zhou, Xingang, and John Zhang. "Preliminary Fatigue Tests on Concrete Exposure to Temperature of up to 300°C." Advances in Structural Engineering 4, no. 4 (October 2002): 197–201. http://dx.doi.org/10.1260/136943301320896660.

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Micro-cracks in the vicinity of paste-aggregate interfaces and in the paste itself can be induced when concrete is exposed to elevated temperatures in the range 100°C-300°C. Although with increase of temperature, the strength of concrete becomes more and more influenced by the growing number of micro-cracks, the compressive strength of concrete at an elevated temperature lower than 300°C is almost the same of concrete at room temperature. Under repeated load, those microcracks caused by temperature would propagate, enlarge and become linked up, as a result, the fatigue behavior of concrete would decrease. In this paper, tests have been carried out to study the fatigue behavior of concrete after exposure to elevated temperatures of up to 300°C. Test results have shown that the reduction of fatigue strength of concrete is remarkable.

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23

Song, Zongxian, Wenbin Gao, Dongpo Wang, Zhisheng Wu, Meifang Yan, Liye Huang, and Xueli Zhang. "Very-High-Cycle Fatigue Behavior of Inconel 718 Alloy Fabricated by Selective Laser Melting at Elevated Temperature." Materials 14, no. 4 (February 20, 2021): 1001. http://dx.doi.org/10.3390/ma14041001.

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This study investigates the very-high-cycle fatigue (VHCF) behavior at elevated temperature (650 °C) of the Inconel 718 alloy fabricated by selective laser melting (SLM). The results are compared with those of the wrought alloy. Large columnar grain with a cellular structure in the grain interior and Laves/δ phases precipitated along the grain boundaries were exhibited in the SLM alloy, while fine equiaxed grains were present in the wrought alloy. The elevated temperature had a minor effect on the fatigue resistance in the regime below 108 cycles for the SLM alloy but significantly reduced the fatigue strength in the VHCF regime above 108 cycles. Both the SLM and wrought specimens exhibited similar fatigue resistance in the fatigue life regime of fewer than 107–108 cycles at elevated temperature, and the surface initiation mechanism was dominant in both alloys. In a VHCF regime above 107–108 cycles at elevated temperature, the wrought material exhibited slightly better fatigue resistance than the SLM alloy. All fatigue cracks are initiated from the internal defects or the microstructure discontinuities. The precipitation of Laves and δ phases is examined after fatigue tests at high temperatures, and the effect of microstructure on the formation and the propagation of the microstructural small cracks is also discussed.

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24

Choi, S. R., and J. P. Gyekenyesi. "Elevated-Temperature “Ultra” Fast Fracture Strength of Advanced Ceramics: An Approach to Elevated-Temperature “Inert” Strength." Journal of Engineering for Gas Turbines and Power 121, no. 1 (January 1, 1999): 18–24. http://dx.doi.org/10.1115/1.2816306.

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The determination of “ultra” fast fracture strengths of five silicon nitride ceramics at elevated temperatures has been made by using constant stress-rate (“dynamic fatigue”) testing with a series of “ultra” fast test rates. The test materials included four monolithic and one SiC whisker-reinforced composite silicon nitrides. Of the five test materials, four silicon nitrides exhibited the elevated-temperature strengths that approached their respective room-temperature strengths at an “ultra” fast test rate of 3.3 × 104 MPa/s. This implies that slow crack growth responsible for elevated-temperature failure can be eliminated or minimized by using the “ultra” fast test rate. These ongoing experimental results have shed light on laying a theoretical and practical foundation on the concept and definition of elevated-temperature “inert” strength behavior of advanced ceramics.

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25

Juijerm, P., I. Altenberger, and Berthold Scholtes. "High-Temperature Fatigue of Deep Rolled Aluminium Alloy AA6110-T6." Materials Science Forum 519-521 (July 2006): 1059–64. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1059.

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The precipitation-hardened aluminium wrought alloy AA6110-T6 (Al-Mg-Si-Cu) was mechanically surface treated (deep rolled) at room temperature. The cyclic deformation behavior and s/n-curves of deep rolled AA6110-T6 have been investigated by stress-controlled fatigue tests at room and elevated temperatures up to 250°C and compared to the polished condition as a reference. The effect of deep rolling on fatigue lifetime under high-loading and/or elevatedtemperature conditions will be discussed. The stability of near-surface residual stresses as well as work-hardening states (FWHM-values) was investigated by X-ray diffraction methods. Residual stress- and FWHM-depth-profiles before and after fatigue tests at elevated temperature are presented. It was found that the investigated AA6110-T6 aluminium alloy shows cyclic softening during stress controlled fatigue tests at room and elevated temperatures. Below a certain stress amplitude at a given temperature, deep rolling can enhance the fatigue lifetime of AA6110-T6 as compared to the untreated state through cyclically stable near-surface work hardening as indicated by stable FWHM values. From the s/n data of deep rolled and polished AA6110-T6, an effective boundary line for the deep rolling treatment in a stress amplitude-temperature diagram can be established.

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26

Rangarajan, S., P. B. Aswath, and W. O. Soboyejo. "Fatigue of in situ Reinforced Ti–8.5Al–1B–1Si." Journal of Materials Research 12, no. 4 (April 1997): 1102–11. http://dx.doi.org/10.1557/jmr.1997.0153.

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The effect of temperature on the fatigue and fracture properties of an in situ reinforced super α alloy Ti–8.5Al–1B–1Si (wt. %) was investigated. At room temperature the as-extruded composite has a strength of 631 MPa with limited ductility. On increasing the temperature to 700 °C only a marginal drop in strength to 610 Mpa was observed along with a significant improvement in ductility to 5.9%. Low-cycle fatigue results indicate a marginal decrease in fatigue life as temperature is increased from room temperature to 700 °C. Fatigue crack growth studies in the as-extruded microstructure indicate a strong influence of R-ratio on both the threshold for fatigue crack growth and crack growth rates in the Paris regimes. At elevated temperatures, the resistance to fatigue crack growth increases with temperature below approximately 500 °C. At 600 °C, however, there is an increase in the near threshold crack growth rate due to embrittlement effects. At higher δK values , the resistance to fatigue crack growth at elevated temperatures is always better than that at room temperature. This improvement is attributed to the increase in the inherent resistance

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27

ZHANG, XIAO-HUA, and DAO-XIN LIU. "INVESTIGATION OF FRETTING FATIGUE BEHAVIOR OF TI811 ALLOY AT ELEVATED TEMPERATURE." International Journal of Modern Physics B 22, no. 31n32 (December 30, 2008): 5489–94. http://dx.doi.org/10.1142/s021797920805070x.

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The fretting fatigue behavior of the Ti 811titanium alloy, as influenced by temperature, slip amplitude, and contact pressure, was investigated using a high-frequency fatigue machine and a home-made high-temperature apparatus. The fretting fatigue failure mechanisms were studied by observing the fretting surface morphology features. The results show that the sensitivity to fretting fatigue is high at both 350°C and 500°C. The higher the temperature is, the more sensitive the alloy is to fretting fatigue failure. Creep is an important factor that influences the fretting fatigue failure process at elevated temperature. The fretting fatigue life of the Ti 811 alloy does not change in a monotonic way as the slip amplitude and contact pressure increase. This is due to the fact that the slip amplitude affects the action of fatigue and wear in the fretting process, and the nominal contact pressure affects the distribution and concentration of the stress and the amplitude of fretting slip at the contact surface, and thus further influences the crack initiation probability and the driving force for propagation.

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Krukemyer, T. H., A. Fatemi, and R. W. Swindeman. "Fatigue Behavior of a 22Cr-20Ni-18Co-Fe Alloy at Elevated Temperatures." Journal of Engineering Materials and Technology 116, no. 1 (January 1, 1994): 54–61. http://dx.doi.org/10.1115/1.2904255.

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An experimental investigation was conducted on Haynes Alloy 556 to study the fatigue behavior of the material at elevated temperatures. Fatigue tests were run at constant temperatures ranging from room temperature to 871°C with strain ranges from 0.265 to 1.5 percent resulting in lives between 102 and 106 cycles. Cyclic deformation properties were evaluated based on the fatigue data. Three fatigue life models were evaluated for their ability to predict the isothermal fatigue lives of the material. These included the Ostergren, Frequency Separation and Stress-Strain-Time models. Strengths and weaknesses of each model are discussed based on the experimental results.

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ABE, Hideaki, Shigehiro SHIMOYASHIKI, and Osamu MAEDA. "Fatigue strength of two-ply bellows at elevated temperature." Journal of the Society of Materials Science, Japan 38, no. 427 (1989): 430–36. http://dx.doi.org/10.2472/jsms.38.430.

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30

KAWAGOISHI, Norio, Yoshihisa OHZONO, Yuzo NAKAMURA, and Masahiro GOTO. "Fatigue Crack Initiation in Alloy 718 at Elevated Temperature." Journal of the Society of Materials Science, Japan 58, no. 12 (2009): 997–1002. http://dx.doi.org/10.2472/jsms.58.997.

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KAGAWA, Hiroyuki, and Masato KURITA. "Fatigue Crack Propagation Behavior of IN738LC at Elevated Temperature." Proceedings of the JSME annual meeting 2002.2 (2002): 237–38. http://dx.doi.org/10.1299/jsmemecjo.2002.2.0_237.

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32

FUKADA, Kazunori, Norio KAWAGOISHI, Hiromitu MURANAKA, Kazuhiro MORINO, and Eiji KONDO. "Fatigue Strength of Nitrided Dies Steels at Elevated Temperature." Transactions of the Japan Society of Mechanical Engineers Series A 67, no. 657 (2001): 912–18. http://dx.doi.org/10.1299/kikaia.67.912.

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33

MUTOH, Yoshiharu, Isao SAKAMOTO, and Satoshi SATOH. "Fatigue strength of ceramic-coated steel at elevated temperature." Transactions of the Japan Society of Mechanical Engineers Series A 56, no. 523 (1990): 507–12. http://dx.doi.org/10.1299/kikaia.56.507.

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34

Parida, B. K., and T. Nicholas. "ELEVATED TEMPERATURE FATIGUE CRACK GROWTH BEHAVIOR OF Ti-1100." Fatigue & Fracture of Engineering Materials and Structures 17, no. 5 (May 1994): 551–61. http://dx.doi.org/10.1111/j.1460-2695.1994.tb00254.x.

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35

Konosu, S. "ELEVATED TEMPERATURE LOW-CYCLE FATIGUE BEHAVIOR OF HK40 ALLOY." Fatigue & Fracture of Engineering Materials and Structures 17, no. 6 (June 1994): 683–93. http://dx.doi.org/10.1111/j.1460-2695.1994.tb00266.x.

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36

Jordan, E. H., and C. T. Chan. "A unique elevated-temperature tension-torsion fatigue test rig." Experimental Mechanics 27, no. 2 (June 1987): 172–83. http://dx.doi.org/10.1007/bf02319471.

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37

Reynolds, A. P. "Elevated temperature fatigue of P/M aluminum alloy 8009." Scripta Metallurgica et Materialia 28, no. 2 (January 1993): 201–6. http://dx.doi.org/10.1016/0956-716x(93)90563-8.

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38

Roebuck, B., C. J. Maderud, and R. Morrell. "Elevated temperature fatigue testing of hardmetals using notched testpieces." International Journal of Refractory Metals and Hard Materials 26, no. 1 (January 2008): 19–27. http://dx.doi.org/10.1016/j.ijrmhm.2007.01.007.

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39

He, Xiao Cong. "Life Prediction of Stainless Steels under Creep-Fatigue." Key Engineering Materials 413-414 (June 2009): 725–32. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.725.

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The aim of this study is to investigate the creep-fatigue behavior of stainless steel materials. Based on the elevated-temperature tensile, creep and rupture test data, thermal creep-fatigue modelling was conducted to predict the failure life of stainless steels. In the low cycle thermal fatigue life model, Manson’s Universal Slopes equation was used as an empirical correlation which relates fatigue endurance to tensile properties. Fatigue test data were used in conjunction with different modes to establish the relationship between temperature and other parameters. Then creep models were created for stainless steel materials. In order to correlate the results of short-time elevated temperature tests with long-term service performance at more moderate temperatures, different creep prediction models, namely Basquin model, Sherby-Dorn model and Manson-Haferd model, were studied. Comparison between the different creep prediction models were carried out for a range of stresses and temperatures. A linear damage summation method was used to establish life prediction model of stainless steel materials under creep-fatigue.

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KWON, JAE DO, SEUNG WAN WOO, IL SUP CHUNG, DONG HWAN YOON, and DAE KYU PARK. "A STUDY ON FRETTING FATIGUE LIFE IN ELEVATED TEMPERATURE FOR INCOLOY 800." International Journal of Modern Physics B 24, no. 15n16 (June 30, 2010): 2561–66. http://dx.doi.org/10.1142/s021797921006526x.

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Incoloy 800, which is used within steam generator tubes, is a heat resistant material since it is an iron-nickel-chromium alloy. However, construction of a systematic database is needed to receive integrity data defecting insurance of specific data about room and elevated temperature fretting fatigue behavior for Incoloy 800. Accordingly, this study investigates the specific change in fatigue limitations under the condition of the fretting fatigue as compared to that under the condition of the plain fatigue by performing plain and fretting fatigue tests on Incoloy 800 at 320°C, real operating temperature and at room-temperature, respectively. The change in the frictional force is measured during the fretting fatigue testing against the repeated cycle, and the mechanism of fretting fatigue is investigated through the observation of the fatigue-fracture surface.

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Millington, S., and S. J. Shaw. "Adhesives for Elevated-Temperature Applications." MRS Bulletin 28, no. 6 (June 2003): 428–33. http://dx.doi.org/10.1557/mrs2003.123.

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AbstractAlthough adhesives, particularly those based on epoxy resins, are finding increasing use in structural applications, their utilization at elevated temperature (>150°C) has been limited by their relatively poor thermal and thermo-oxidative stability. As a result, significant effort has been directed in recent years toward the development of polymers exhibiting increased thermal resistance. Although a wealth of research conducted over several decades has resulted in a myriad of polymer types exhibiting, in some cases, impressive high-temperature performance, many systems have demonstrated poor processability Thus, much emphasis has been placed on developing high-temperature performance while providing processability characteristics that are similar, if not identical, to epoxies. This article considers the various approaches that have been shown to offer such dual capabilities. In addition, the results of various studies undertaken to investigate the effects of elevated temperature on the strength and fatigue resistance of bonded joints are reported.

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Sakane, Masao, Masateru Ohnami, Teruyoshi Awaya, and Nakao Shirafuji. "Frequency and Hold-Time Effects on Low Cycle Fatigue Life of Notched Specimens at Elevated Temperature." Journal of Engineering Materials and Technology 111, no. 1 (January 1, 1989): 54–60. http://dx.doi.org/10.1115/1.3226433.

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This paper describes the frequency and hold-time effects on high temperature low cycle fatigue for round notched specimens. Unnotched and notched specimens having different elastic stress concentration factors were fatigued under triangular and trapezoidal stress waves at frequencies ranging from 5 Hz to 0.0001 Hz at 873 K. The three specific fracture characteristics were observed: cycle dependent, time dependent, and cycle-time dependent. The respective notch sensitivity occurred in the respective fracture regime. The fatigue life of notched specimens was predicted from the elastic-plastic-creep cyclic FEM analysis using the linear damage rule and the strain range partitioning rule. Both the life prediction methods predicted the creep-fatigue life within almost a factor of two scatter band.

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Chen, Nian Jin, Zeng Liang Gao, Wei Zhang, and Yue Bao Le. "Study on Life Prediction Method for Creep-Fatigue Interaction at Elevated Temperature." Key Engineering Materials 353-358 (September 2007): 190–94. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.190.

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The law of low-cycle fatigue with hold time at elevated temperature is investigated in this paper. A new life prediction model for the situation of fatigue and creep interaction is developed, based on the damage due to fatigue and creep. In order to verify the prediction model, strain-controlled low-cycle fatigue tests at temperature 693K, 823K and 873K and fatigue tests with various hold time at temperature 823K and 873K for 316L austenitic stainless steel were carried out. Good agreement is found between the predictions and experimental results.

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Tobushi, Hisaaki, Takafumi Nakahara, Yoshirou Shimeno, and Takahiro Hashimoto. "Low-Cycle Fatigue of TiNi Shape Memory Alloy and Formulation of Fatigue Life." Journal of Engineering Materials and Technology 122, no. 2 (November 8, 1999): 186–91. http://dx.doi.org/10.1115/1.482785.

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The low-cycle fatigue of a TiNi shape memory alloy was investigated by the rotating-bending fatigue tests in air, in water and in silicone oil. (1) The influence of corrosion fatigue in water does not appear in the region of low-cycle fatigue. (2) The temperature rise measured through an infrared thermograph during the fatigue test in air is four times as large as that measured through a thermocouple. (3) The fatigue life at an elevated temperature in air coincides with the fatigue life at the same elevated temperature in water. (4) The shape memory processing temperature does not affect the fatigue life. (5) The fatigue equation is proposed to describe the fatigue life depending on strain amplitude, temperature and frequency. The fatigue life is estimated well by the proposed equation. [S0094-4289(00)01102-6]

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Usami, S., Y. Fukuda, and S. Shida. "Micro-Crack Initiation, Propagation and Threshold in Elevated Temperature Inelastic Fatigue." Journal of Pressure Vessel Technology 108, no. 2 (May 1, 1986): 214–25. http://dx.doi.org/10.1115/1.3264772.

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Micro-crack initiation, propagation and threshold behavior in plain, short crack, weld defect and notch specimens of 304 stainless steel are observed under elevated temperature strain-controlled inelastic fatigue conditions. The effects of temperature, strain rate, wave shape and strain gradient are analyzed and methods for estimating fatigue life and fatigue limit are postulated on the basis of the behavior of the micro-cracks.

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Smaga, Boemke, Daniel, Skorupski, Sorich, and Beck. "Fatigue Behavior of Metastable Austenitic Stainless Steels in LCF, HCF and VHCF Regimes at Ambient and Elevated Temperatures." Metals 9, no. 6 (June 21, 2019): 704. http://dx.doi.org/10.3390/met9060704.

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Corrosion resistance has been the main scope of the development in high-alloyed low carbon austenitic stainless steels. However, the chemical composition influences not only the passivity but also significantly affects their metastability and, consequently, the transformation as well as the cyclic deformation behavior. In technical applications, the austenitic stainless steels undergo fatigue in low cycle fatigue (LCF), high cycle fatigue (HCF), and very high cycle fatigue (VHCF) regime at room and elevated temperatures. In this context, the paper focuses on fatigue and transformation behavior at ambient temperature and 300 °C of two batches of metastable austenitic stainless steel AISI 347 in the whole fatigue regime from LCF to VHCF. Fatigue tests were performed on two types of testing machines: (i) servohydraulic and (ii) ultrasonic with frequencies: at (i) 0.01 Hz (LCF), 5 and 20 Hz (HCF) and 980 Hz (VHCF); and at (ii) with 20 kHz (VHCF). The results show the significant influence of chemical composition and temperature of deformation induced ´-martensite formation and cyclic deformation behavior. Furthermore, a “true” fatigue limit of investigated metastable austenitic stainless steel AISI 347 was identified including the VHCF regime at ambient temperature and elevated temperatures.

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Lukács, János. "Fatigue Crack Growth Examinations on Austenitic Stainless Steel in Corrosive Environment and at Elevated Temperature." Materials Science Forum 659 (September 2010): 49–54. http://dx.doi.org/10.4028/www.scientific.net/msf.659.49.

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There are different documents and standards containing fatigue crack propagation limit or design curves and rules for the prediction of crack growth. The background of the curves and the calculations consist of two basic parts: statistical analysis of numerous experiments and a fatigue crack propagation law. The research work aimed to measure basic data for limit curves on austenitic stainless steel, in corrosive environment and at elevated temperatures, and to determine the design curves based on statistical analysis of measured data and a fatigue crack propagation law. Experiments were performed on modified CT specimens, in water solution and at two different temperatures. The fatigue crack growth tests were executed by constant load amplitude method. In order to study the hold time effect, fatigue crack growth tests were terminated and hold time period was applied. It can be concluded that the modified CT specimens are suitable for fatigue crack growth tests in corrosive environment; the fatigue crack propagation characteristics are different at different testing temperatures; and stable crack propagation and/or crack tip blunting can be detected during the hold time period at the used higher testing temperature.

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Watanabe, Osamu, and Takuya Koike. "Creep-Fatigue Life Evaluation Method for Perforated Plates at Elevated Temperature." Journal of Pressure Vessel Technology 128, no. 1 (October 15, 2005): 17–24. http://dx.doi.org/10.1115/1.2137766.

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The accurate evaluation scheme for creep-fatigue strength is one of the continuing main issues for elevated temperature design; particularly, the three-dimensional structure having stress concentration is becoming more important. The present paper investigates fatigue strength and creep-fatigue strength of perforated plate having stress concentration as an example. The specimens are made of type 304 SUS stainless steel, and the temperature is kept to 550°C. The whole cycles of the experiment record are analyzed, and the characteristics of the structure having stress concentration are discussed. The present paper employs stress redistribution locus (abbreviated as SRL) in evaluation plastic behavior in cyclic fatigue process as well as stress relaxation in creep process, and the feasibility is discussed in conjunction with the comparison to experimental results.

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Ratiu, M. D., and N. T. Mosidis. "Qualification of Diesel Generator Exhaust Carbon Steel Piping to Intermittent Elevated Temperatures." Journal of Pressure Vessel Technology 118, no. 1 (February 1, 1996): 42–47. http://dx.doi.org/10.1115/1.2842161.

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The diesel generator exhaust piping, usually made up of carbon steel piping (e.g., ASME SA-106, SA-53), is subjected to successive short time exposures at elevated temperatures up to 1000° F (538°C). A typical design of this piping, without consideration for creep-fatigue cumulative damage, is at least incomplete, if not inappropriate. Also, a design for creep-fatigue, usually employed for long-term exposure to elevated temperatures, would be too conservative and will impose replacement of the carbon steel piping with heat-resistant CrMo alloy piping. The existing ASME standard procedures do not explicitly provide acceptance criteria for the design qualification to withstand these intermittent exposures to elevated temperatures. The serviceability qualification proposed is based on the evaluation of equivalent full temperature cycles which are presumed/expected to be experienced by the exhaust piping during the design operating life of the diesel engine. The proposed serviceability analysis consists of: (a) determination of the permissible stress at elevated temperatures, and (b) estimation of creep-fatigue damage for the total expected cycles of elevated temperature exposures following the procedure provided in ASME Code Cases N-253-6 and N-47-28.

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Ratiu, M. D., and N. T. Moisidis. "A Serviceability Approach for Carbon Steel Piping to Intermittent High Temperatures." Journal of Pressure Vessel Technology 118, no. 4 (November 1, 1996): 496–501. http://dx.doi.org/10.1115/1.2842220.

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Carbon steel piping (e.g., ASME SA-106, SA-53), is installed in many industrial applications (i.e., diesel generator exhaust manifold) where the internal gas flow subjects the piping to successive short time exposures at elevated temperatures up to 1100°F. A typical design of this piping without consideration for creep-fatigue cumulative damage is at least incomplete if not inappropriate. Also, a design for creep-fatigue, usually employed for long-term exposure to elevated temperatures, would be too conservative and will impose replacement of the carbon steel piping with heat-resistant CrMo steel piping. The existing ASME Standard procedures do not explicitly provide acceptance criteria for the design qualification to withstand these intermittent exposures to elevated temperatures. The serviceability qualification proposed is based on the evaluation of equivalent full temperature cycles which are presumed/expected to be experienced by the exhaust piping during the design operating life of the diesel engine. The proposed serviceability analysis consists of: (a) determination of the permissible stress at elevated temperatures, and (b) estimation of creep-fatigue damage for the total expected cycles of elevated temperature exposures following the procedure provided in ASME Code Cases N-253-6 and N-47-28.

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Journal articles on the topic 'Elevated temperature fatigue'

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