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Relevant bibliographies by topics / Limit of endurance strength

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Academic literature on the topic 'Limit of endurance strength'

Author: Grafiati

Published: 28 May 2022

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Journal articles on the topic "Limit of endurance strength"

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Bian, X. X., G. Zhou, Liwei, and J. Z. Tan. "Investigation of bending fatigue strength limit of alloy steel gear teeth." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 3 (January 6, 2012): 615–25. http://dx.doi.org/10.1177/0954406211434670.

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An experimental investigation was conducted on the single-tooth pulsating bending fatigue of 38SiMnMo alloy steel at a frequency range of 140–150 Hz. Using both up–down test method and S–N curve extension method, statistical data in terms of curves and endurance limits were analysed. The testing and analytical results indicated that the ‘platform’ of fatigue curves exists and the S–N curve cannot be extended to the cyclic basic number Nb in order to obtain the endurance limit. Furthermore, on the basis of the life distribution optimization, the three-parameter Weibull distribution was used for statistical data analysis. The statistical analysis showed that the bending endurance limit of 38SiMnMo alloy steel gears estimated at 99 per cent reliability and 95 per cent confidence was 284 MPa, which was located at the slightly low part of the mean line in the chart range illustrated in the standards ISO6336 and GB3480. The results demonstrated that the method described in this article was valuable.

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Henderson, Bradley S., Katelyn F. Cudworth, Madison E. Wale, Danielle N. Siegel, and Trevor J. Lujan. "Tensile fatigue strength and endurance limit of human meniscus." Journal of the Mechanical Behavior of Biomedical Materials 127 (March 2022): 105057. http://dx.doi.org/10.1016/j.jmbbm.2021.105057.

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Han, J., W. T. Hwang, C. E. Lee, and H. K Kim. "Fatigue strength of a tensile-shear loaded clinched joint made from an al-5052 alloy sheet." International Journal of Engineering & Technology 9, no. 1 (February 25, 2020): 252. http://dx.doi.org/10.14419/ijet.v9i1.30221.

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The clinching process has been shown to be able to join dissimilar material sheets as an alternative to spot welding. In this study, monotonic and fatigue tests were conducted using tensile-shear specimens for an evaluation of the strengths of a joint. In the fatigue tests, an interface failure occurred. The fatigue ratio of the joint is 0.29, assuming a fatigue endurance limit at 2 x106 cycles. The maximum von-Mises stress of the joint at the load amplitude corresponding to the fatigue endurance limit is slightly higher than the yield strength of Al-5052 alloy. This indicates that the strength of the neck region is increased partially due to work hardening.

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Mlikota, Marijo, and Siegfried Schmauder. "A Newly Discovered Relation between the Critical Resolved Shear Stress and the Fatigue Endurance Limit for Metallic Materials." Metals 10, no. 6 (June 17, 2020): 803. http://dx.doi.org/10.3390/met10060803.

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The paper introduces a valuable new description of fatigue strength in relation to material properties and thus a new perspective on the overall understanding of the fatigue process. Namely, a relation between the endurance limits and the accompanying values of the critical resolved shear stress (CRSS) for various metallic materials has been discovered by means of a multiscale approach for fatigue simulation. Based on the uniqueness of the relation, there is a strong indication that it is feasible to relate the endurance limit to the CRSS and not to the ultimate strength, as often done in the past.

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Malysh, S. V., I. M. Kovenskiy, and L. Z. Chaugarova. "Influence of chrome electroplating on fatigue strength of parts." Oil and Gas Studies, no. 5 (November 12, 2020): 112–19. http://dx.doi.org/10.31660/0445-0108-2020-5-112-119.

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The article is devoted to the results of studies, which have been conducted on parts with electrolytic chromium in order to determine the effect of the coating on fatigue strength of their. The work was performed in observance of standards, which are fixed in GOST RV 2840-001-2008. Samples for the tests were made from standard gas turbine engine compressor blades. We used a VEDS- 1500 electrodynamic vibration stand with an UMK-12K power amplifier to excite vibrations. It has been shown that the minimum endurance limit of 46 kgf/mm2 based on 2 ∙ 107 cycles, established on uncoated parts, didn't decrease during fatigue tests of compressor blades with an electroplated chrome layer. It should be stressed that the influence of the geometry of the chrome-plated part on the reduction of the endurance limit has been established.

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Roth, Ralf, Lars Donath, Lukas Zahner, and Oliver Faude. "Muscle Activation and Performance During Trunk Strength Testing in High-Level Female and Male Football Players." Journal of Applied Biomechanics 32, no. 3 (June 2016): 241–47. http://dx.doi.org/10.1123/jab.2014-0303.

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For performance and injury prevention in sport, core strength and endurance are focused prerequisites. Therefore we evaluated characteristics of trunk muscle activation and performance during strength-endurance related trunk field tests. Strength-endurance ability, as total time to failure, and activation of trunk muscles was measured in 39 football players of the highest German female football league (Bundesliga) (N = 18, age: 20.7 y [SD 4.4]) and the highest national male under-19 league (N = 21, age: 17.9 y [0.7]) in prone plank, side plank, and dorsal position. Maximal isometric force was assessed during trunk extension and flexion, rotation, and lateral flexion to normalize EMG and to compare with the results of strength-endurance tests. For all positions of endurance strength tests, a continuous increase in normalized EMG activation was observed (P < .001). Muscle activation of the rectus abdominis and external oblique in prone plank position exceeded the maximal voluntary isometric contraction activation, with a significantly higher activation in females (P = .02). We conclude, that in the applied strength-endurance testing, the activation of trunk muscles was high, especially in females. As high trunk muscle activation can infer fatigue, limb strength can limit performance in prone and side plank position, particularly during high trunk muscle activation.

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Bark, H., M. Nizri, A. Tarasuik, and D. Heimer. "Effects of hyperphosphatemia on diaphragmatic strength and endurance." Journal of Applied Physiology 73, no. 1 (July 1, 1992): 82–87. http://dx.doi.org/10.1152/jappl.1992.73.1.82.

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Effects of an infusion of Na2HPO4 on diaphragm strength, endurance, and magnitude of recovery were evaluated in in situ canine diaphragm strips. Results showed no effect on maximal isometric tetanic tension. Twitch tension and tension in the low- (10-Hz) frequency range were significantly increased (P less than 0.01). Time to fatigue (endurance) increased by 38 +/- 4.5% in the group that received phosphorus compared with its control and decreased by 18.5 +/- 2.5% in the group that received dextrose compared with its control (P less than 0.005). Recovery from fatigue was also significantly improved after the phosphorus infusion. Serum ATP and 2,3-diphosphoglycerate levels were unchanged throughout the experiment. The results of this study support the notion that hyperphosphatemia improves diaphragmatic endurance and recovery from fatigue. The mechanisms involved may in part be due to the phosphate-buffering effects, which limit the extent of the muscle intracellular acidosis produced with fatigue.

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Abdurrahman, Wahid, and Muhamad Fitri. "The Fatigue Strength Analysis of ABS (Acrylonitrile Butadiene Styrene) Material Shaft Result of 3D Printing Process due to Rotating Bending Load." Materials Science Forum 1051 (January 25, 2022): 137–44. http://dx.doi.org/10.4028/www.scientific.net/msf.1051.137.

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Prototyping a product using 3D (three-dimensional) printing process has been widely used. One of the materials commonly used is ABS (Acrylonitrile Butadiene Styrene). Currently, research did not refer to ASTM E-466 and tested specimens at 75% infill density without endurance limit analysis. The purpose of this research was to analyse the fatigue strength of 3D printed ABS material with infill density 100% due to rotating bending load according to ASTM E-466 standard, compare it with the 75% infill density test result and determine the value of its endurance limit. The research method used is experimental research by testing the fatigue strength of a number of ABS material specimens with four rotating bending load conditions until the specimen fails. The obtained result of the research is a S-N curve with maximum average cycle of 143702 at a stress of 26.87 MPa and minimum average cycle of 145 at a stress of 35.71 MPa. The shaft fatigue strength of ABS 3D printed with infill density 100% material has higher cycles at stresses below 37.1 MPa and lower cycles at stresses above 37.1 MPa compared to 75% infill density. The endurance limit obtained from the regression of the S-N curve is 16.25 MPa.

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Savel’ev, A. N., E. A. Savel’eva, D. O. Anisimov, and O. D. Prokhorenko. "APPLICATION OF STRESS WAVES EMISSION FOR DETERMINATION OF FATIGUE CHARACTERISTICS OF MATERIAL." Izvestiya. Ferrous Metallurgy 62, no. 2 (March 30, 2019): 141–47. http://dx.doi.org/10.17073/0368-0797-2019-2-141-147.

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Results of experimental evaluation of the fatigue characteristics of tested samples material are considered based on emission of stress waves. Using previously published data on synergistically organized acoustic emission, an experiment was prepared and performed. In experiments on different materials, possibility of using acoustic emission signal for operative determination of mechanical characteristics and, above all, the limit of endurance were demonstrated. Samples for strength testing of materials were made of five steel grades and one grade of Br AZh9-4 bronze. Five experiments were conducted on each of the materials. The samples in the experiment underwent a fine-step loading, at each step of it radiation of signal occurred simultaneously, and another series of dislocations was prepared, that could reach surface of crystal and emit a stress wave at the next moment of loading. Thus, the joint radiation of energy dislocations prepared for movement was already formed. A comparison of experimental data, obtained on the basis of acoustic emission, with calculated values of endurance limit, obtained by empirical formulas through the ultimate strength of this material, performed by the Fisher criterion, has shown their adequacy at a significance level of 5 %. Evaluation of the experimental results of endurance limit determination on basis of acoustic emission by the Cochran test indicates that variances of measurement results in experiment are uniform for all types of used materials. The results have shown that such method on the basis of synergistically organized acoustic emission allows us to quickly obtain experimental values of endurance limit of material with sufficiently high degree of accuracy.

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de Leon, Michael B., Arman Ray Nisay, and Hyung-Seop Shin. "Evaluation of electrical fatigue limits in REBCO coated conductor tapes through static fatigue testing at 77 K." Superconductor Science and Technology 35, no. 2 (December 22, 2021): 025009. http://dx.doi.org/10.1088/1361-6668/ac32ac.

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Abstract Significant development has been made toward guaranteeing the performance of high-temperature superconducting (RE)Ba2Cu3O7−x coated conductor (CC) tapes in superconducting devices such as high-field magnets and coils. To understand the superconducting behaviors of CC tapes used in such devices under various mechanical- and thermal-induced loads, their mechanical and electromechanical properties should be evaluated in consideration of their application environments. Under static or cyclic fatigue loads, critical current (I c) can degrade as a result of damage to the superconducting layer, even under loads that do not exceed the irreversible stress limits for I c degradation (σ irr). Therefore, prediction of the stress level that can degrade I c under various conditions, such as the endurance limit (stress), is significant for actual coil or magnet applications of CC tapes. A static fatigue tester for CC tapes at 77 K was used in this study to apply a static fatigue load to a 12 mm wide GdBa2Cu3O7−x CC tape specimen under simultaneous axial tension and bending stresses in a U-shaped configuration. Bending mandrels were used to superimpose various bending strains onto the applied static axial tensile strain, and I c across various voltage tap separations was measured over time, up to 100 h. The electrical static fatigue strength and endurance limit for I c degradation were determined based on the 95% I c retention criterion and 100 h of elapsed time, respectively. Results show that bending strain, dependent on mandrel diameter, can greatly influence I c degradation behaviors and that I c can drop considerably in the bent sections compared to the straight sections over time. Analyses of the combined strains in the bent sections allowed the prediction of diameter-dependent electrical static endurance limits under subcritical crack growth. The CC tape’s electrical static endurance limit was greatly affected at smaller bending diameters. When CC coils with diameters smaller than or equal to 50 mm are made using 12 mm wide CC tapes, the electrical static endurance limit is low, roughly ⩽0.63σ irr.

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Dissertations / Theses on the topic "Limit of endurance strength"

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Stone, Michael H. "Strength Training and Endurance." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etsu-works/4576.

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Stone, Michael H., Margaret E. Stone, and Kimitake Sato. "Endurance: Influence of Strength Training." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/4572.

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Stone, Michael H. "Strength Training for Endurance Sports." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etsu-works/4499.

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Stone, Michael H., Meg E. Stone, William A. Sands, Kyle C. Pierce, Robert U. Newton, G. Gregory Haff, and Jon Carlock. "Maximum Strength and Strength Training---A Relationship to Endurance?" Digital Commons @ East Tennessee State University, 2006. https://dc.etsu.edu/etsu-works/4615.

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Endurance can be defined as the ability to maintain or to repeat a given force or power output. The sport performance-endurance relationship is a multi-factorial concept. However, evidence indicates that maximum strength is a major component. Conceptually, endurance is a continuum. The literature indicates that (a) maximum strength is moderately to strongly related to endurance capabilities and associated factors, a relationship that is likely stronger for high intensity exercise endurance (HIEE) activities than for low intensity exercise endurance (LIEE); (b) strength training can increase both HIEE and LIEE, the effect being greater for HIEE; (c) the volume of strength training plays a role in endurance adaptation; and (d) mechanical specificity and training program variables also play a role in the degree of adaptation..

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Creager, Leah C. "Effect of trunk endurance training on low back endurance & injury in collegiate gymnasts /." Connect to online version, 2009. http://minds.wisconsin.edu/handle/1793/45122.

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Bazyler, Caleb D., Heather A. Abbott, Christopher R. Bellon, Christopher B. Taber, and Michael H. Stone. "Strength Training for Endurance Athletes: Theory to Practice." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/3781.

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The purpose of this review is twofold: to elucidate the utility of resistance training for endurance athletes, and provide the practitioner with evidenced-based periodization strategies for concurrent strength and endurance training in athletic populations. Both low-intensity exercise endurance (liee) and high-intensity exercise endurance (hiee) have been shown to improve as a result of maximal, high force, low velocity (hflv) and explosive, low-force, high-velocity strength training. Hflv strength training is recommended initially to develop a neuromuscular base for endurance athletes with limited strength training experience. A sequenced approach to strength training involving phases of strength-endurance, basic strength, strength, and power will provide further enhancements in liee and hiee for high-level endurance athletes.

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McElligott, Mark, and n/a. "The relationship between strength and endurance in female triathletes." University of Canberra. Human and Heritage Sciences, 1992. http://erl.canberra.edu.au./public/adt-AUC20060918.160011.

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Mistry, Anuj D. "Effects of Yoga on Low Back Stability, Strength and Endurance." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/35979.

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AIMS: To investigate the effects of Yoga on improving low back stability (threshold of stability, and mean total velocity of center of pressure), trunk strength (isometric strength in extension and flexion), and back endurance (isometric endurance in extension, flexion, and side laterals). METHODS: A pretest posttest control group experimental design was used. Sixteen participants, 10 females and 6 males, without a history of low back pain, and no prior experience of Yoga, were recruited. Yoga participants were recruited following registration in a yoga class; the control subjects were selected and recruited selectively in order to match the stature and body mass of the Yoga participant pool. Performance was measured prior to the beginning of Yoga exercises and 7 weeks later for both the groups. RESULTS: Contrary to the control group, the Yoga group significantly improved in terms of low back stability (decrease in threshold of stability by ~19%) and sway parameters (decrease in mean total velocity of COP by ~17%). CONCLUSIONS: The outcomes of this study illustrate the potential of Yoga as a low-impact exercise regime for improving low back stability via neuromuscular control and proprioception. There was no significant difference in trunk strength and endurance when comparing the two groups; therefore, the Yoga exercise was equally effective as the regular exercises.
Master of Science

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Books, Gregory D. (Gregory Douglas). "Effects of Endurance Intensity and Rest Interval on Subsequent Strength Performance." Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc278409/.

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The purpose of this study was to examine the acute effects of cycling exercise at different intensities and rest intervals on strength performance. Ten males, engaged in concurrent training for at least one month prior to testing, comprised the subject group for this study. Results show only leg press torque and leg press work to be decreased after cardiorespiratory exercise of moderate intensity. Leg extension average power, chest press torque, chest press power, and chest press work after cycling were not decreased from pre-exercise values. No significant effects were found for exercise intensity, testing times, or intensity by testing times. These results indicate that lower body strength is decreased by cycling and that one hour is not sufficient to restore leg strength.

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Kaleth, Anthony Scott. "Effects of volume of resistance training on muscular strength and endurance." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1074543.

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The American College of Sports Medicine recommends a resistance exercise routine that consists of a minimum of 1 set of 8-12 repetitions on 8-10 exercises, 2 times per week. These guidelines are less than traditional programs and are based on the premises that longer programs are associated with lower adherence and that additional sets and repetitions produce little, if any, additional increases in strength. Therefore, the purpose of this study was to determine if greater gains in strength and endurance could be attained by doubling the recommended dose. Sixteen subjects were randomly assigned to one of two training groups that performed 1 or 2 sets of 8-12 repetitions for 10 weeks on 7 exercises (chest press, lat pull-down, leg ext., leg curl, shoulder press, triceps ext., biceps curl) and 8 subjects were assigned to a non-training group. Pre- and post-training 1repetition maximum (RM) and muscular endurance were measured. To assess endurance, subjects completed as many repetitions as possible at 75% of their pre-training 1-RM on all exercises except the shoulder press (60% of 1-RM). Both training groups showed a significant increase in 1-RM strength and endurance compared to controls (P < 0.05). Only the biceps curl exercise showed a significant difference in strength between the two training groups (P < 0.05). The 2 sets group increased post-training endurance to a greater degree than the 1 set group, but only the lat pull-down exercise was significant (P < 0.05).. Contrary to previous studies, these findings pertain to 8-10 exercises that use larger muscle groups. It was concluded that 1 set of 8-12 repetitions was as effective as 2 sets in increasing muscular strength and endurance.
School of Physical Education

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Books on the topic "Limit of endurance strength"

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Robarge, Maurita B. S.E.T.S.: The strength and endurance training system. Wayzata, Minn. (P.O. Box 955, Wayzata 55391): Kimarr Pub. Co., 1985.

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Prowell, Brian D. Validating the fatigue endurance limit for hot mix asphalt. Washington, D.C: Transportation Research Board, 2010.

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Anderson, R. Michael, Samuel H. Carpenter, Jo Sias Daniel, Brian D. Prowell, Shihui Shen, Sudip Bhattacharjee, Aravind Krishna Swamy, E. Ray Brown, Harold Von Quintus, and Saeed Maghsoodloo. Validating the Fatigue Endurance Limit for Hot Mix Asphalt. Washington, D.C.: National Academies Press, 2010. http://dx.doi.org/10.17226/14360.

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Witczak, Matthew, Michael Mamlouk, Mena Souliman, and Waleed Zeiada. Laboratory Validation of an Endurance Limit for Asphalt Pavements. Washington, D.C.: Transportation Research Board, 2013. http://dx.doi.org/10.17226/22453.

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Guisado, Raul. Crosstraining for endurance athletes: Building stability, balance, and strength. Boulder, Colo: Peak Sports Press, 2005.

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Schaffer, Erwin L. Strength validation and fire endurance of glued-laminated timber beams. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1986.

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Systems, Nautilus Human Performance, ed. Building strength & stamina. 2nd ed. Champaign, IL: Human Kinetics, 2003.

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Foster, Sasha. Canine cross training: Building balance, strength, and endurance in your dog. Wenatchee, Washington, U.S.A: Dogwise Publishing, 2013.

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Hartmann, Jürgen. Strength, speed, and endurance for athletes: 100 combative activities for partners. Toronto: Sport Books Publisher, 1990.

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Owen, Peter F. To the limit of endurance: A battalion of Marines in the Great War. College Station, TX: Texas A&M University Press, 2007.

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Book chapters on the topic "Limit of endurance strength"

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Chen, Geng, Utku Ahmet Ozden, Alexander Bezold, Christoph Broeckmann, and Dieter Weichert. "On the Statistical Determination of Yield Strength, Ultimate Strength, and Endurance Limit of a Particle Reinforced Metal Matrix Composite (PRMMC)." In Direct Methods for Limit and Shakedown Analysis of Structures, 105–22. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12928-0_6.

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Gooch, Jan W. "Endurance Limit." In Encyclopedic Dictionary of Polymers, 268. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4411.

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Pelleg, Joshua. "Endurance Limit." In Structural Integrity, 27–44. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86118-6_2.

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Grier, Tyson, Bradley C. Nindl, and Bruce H. Jones. "Strength, endurance, and movement." In APA handbook of human systems integration., 149–61. Washington: American Psychological Association, 2015. http://dx.doi.org/10.1037/14528-010.

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Rønnestad, Bent R. "Strength Training for Endurance Cyclists." In Concurrent Aerobic and Strength Training, 333–40. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75547-2_22.

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Beattie, Kris. "Strength Training for Endurance Runners." In Concurrent Aerobic and Strength Training, 341–55. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75547-2_23.

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Millet, Guillaume Y., and John Temesi. "Neural Adaptations to Endurance Training." In Concurrent Aerobic and Strength Training, 35–50. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75547-2_4.

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DiMenna, Fred J., and Andrew M. Jones. "Developing Endurance for Sports Performance." In Strength and Conditioning for Sports Performance, 368–80. 2nd ed. Second edition. | New York, NY : Routledge, 2021.: Routledge, 2021. http://dx.doi.org/10.4324/9780429330988-21.

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Hackney, Anthony C. "Molecular and Physiological Adaptations to Endurance Training." In Concurrent Aerobic and Strength Training, 19–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75547-2_3.

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Lieurade, Henri-Paul. "Modeling of Fatigue Strength and Endurance Curve." In Fatigue of Materials and Structures, 23–67. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623435.ch2.

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Conference papers on the topic "Limit of endurance strength"

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"Fatigue Strength and Endurance Limit of Lightweight Concrete." In SP-136: Structural Lightweight Aggregate Concrete Performance. American Concrete Institute, 1993. http://dx.doi.org/10.14359/4130.

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Li, W., Y. B. Guo, M. E. Barkey, C. Guo, and Z. Q. Liu. "Surface Integrity and Fatigue Strength of Hard Milled Surfaces." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50282.

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Tool flank wear during hard milling adversely affects surface integrity and, therefore, fatigue strength of machined components. Surface integrity and machining accuracy deteriorate when tool wear progresses. In this paper, surface integrity and its impact on endurance limit of AISI H13 tool steel (50 ± 1 HRC) by milling using PVD coated tools are studied. The evolutions of surface integrity including surface roughness, microhardness and microstructure were characterized at three levels of tool flank wear (VB = 0, 0.1mm, 0.2mm). At each level of tool flank wear, the effects of cutting speed, feed, and radial depth-of-cut on surface integrity were investigated respectively. Fatigue endurance limits of the machined surfaces at different reliability levels were calculated and correlated with the experimentally determined fatigue life. The good surface finish and significant strain-hardening on the machined surfaces enhance endurance limit, which enables machined components have a fatigue life over 106 cycles.

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Solin, Jussi, Jouni Alhainen, Esko Arilahti, Tommi Seppänen, and Wolfgang Mayinger. "Particular Fatigue Resistance of Stabilized Stainless Steel: Endurance Limit, Strength and Ductility of Fatigued Steel." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93317.

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Abstract Comprehensive experimental research on fatigue performance of niobium stabilized (type 347) X6CrNiNb1810mod steel has revealed particular features of cyclic performance. This paper reports and discusses on the endurance limit behavior studied by strain controlled HCF tests at room and elevated temperatures. In contrast to carbon steels, stainless steels can tolerate notable amounts of plastic strain and display broad hysteresis loops at and below endurance limit. Together with pronounced secondary hardening, this results to abrupt endurance limit behavior. The modified Miner rule with S-N–curves extrapolated to low amplitudes is generally applicable for carbon steels, but not for stainless. Effectiveness of the endurance limit even with variable amplitude straining was shown for 347 type steel. Extrapolation of ε-N curves beyond a few million cycles is conservative. An increase of temperature decreases, but does not vanish the endurance limit. Another peculiar feature of the studied stainless steel is its superior ductility, which is not affected by partial fatigue ‘damage’. Five LCF tests at 325°C and 0.22 ≤ εa ≤ 0.5% were interrupted beyond the half-life condition (N/N25 ≥ 0.5) at 0.5 ≤ CUF ≤ 0.9. Cyclic straining was directly followed by monotonic pulling to fracture. Surprisingly low correlation between tensile properties and fatigue usage was observed. The ultimate tensile strength was preserved within 10 MPa (2.5%) in all cases. Yield strength and elongation remained practically unchanged by pre-fatigue. This paper provides new experimental results. They are discussed together with earlier observations on the same steel extracted from a pipe, which has been manufactured for use in primary loop of a German NPP.

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Hayashi, Makoto, and Takashi Ito. "Fretting Fatigue Strength of Nozzle Shaped Structure." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2989.

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In-Core Monitor (ICM) housing of BWR reactor pressure vessel is subjected to the flow induced vibration (FIV). The flow fluctuation takes places in the lower plenum of reactor pressure vessel. It is very much important to evaluate the structural integrity of ICM housing in order to maintain high operating rate. Thus we performed the FIV simulated fatigue test of ICM housing. However, the stress at the weld toe induced by FIV is sufficiently low not to fail. The fatigue endurance limit for the weld root fatigue test specimen with dull taper is 196 MPa. On the while, the fatigue endurance limit for the weld root fatigue test specimen with steep taper is not obtained. When the fatigue test results are approximated by the Stromeyer equation, the fatigue strength for the fatigue life of 109 cycles is estimated as 27 MPa. Finally we performed the fracture mechanics analysis, which indicates that the stress intensity factors for Mode I and II range from 0.1 to 0.2 MPam so that the fatigue crack is not initiated at the weld root by FIV.

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Zhang, Y. H., and S. J. Maddox. "Estimating Long-Endurance Fatigue Strength of Girth-Welded Pipes Using Local Stress Approach." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23066.

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Nominal and hot spot stresses are conventionally used for fatigue design of welded joints. In this paper, use of local stress approaches was attempted to estimate the long endurance fatigue strength of girth welded pipes. Finite element modelling was carried out to determine the dependence of the stress concentration and through-wall stress distribution on weld root bead profile, with hi-lo values ranging from 0.25 up to 1.0mm. Two local stress approaches, critical distance and reference radius, were used to estimate the fatigue strength of girth welds at 5×106 and 107 cycles, which were then compared with available full-scale fatigue test results. To use the critical distance approach, the relevant material properties, such as threshold stress intensity factor range and fatigue limit for flush ground welds, were determined experimentally. This paper presents the results of the fatigue strength estimates and draws conclusions about the applicability of the local stress approaches to girth welds.

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Bondarev, B., A. Bondarev, A. Korneeva, and E. Basinskikh. "WOOD-GLASS-FIBER COMPOSITE MATERIALS BASED ON POLYESTER RESINS FOR TIMBER RAILWAY SLEEPER STRUCTURES." In Modern machines, equipment and IT solutions for industrial complex: theory and practice. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2021. http://dx.doi.org/10.34220/mmeitsic2021_198-204.

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Wood-glass-fiber composite materials (WGFCM) are used in transport construction (sleepers, switch bars, etc.). Polymer solutions based on furfuralacetone monomer (FAM) served as a matrix for the manufacture of WGFCM. The article suggests using Holex HAS- 2061 polyester resin as a matrix, which, in turn, has chemical resistance, dielectric properties, increased impact strength, having sufficient strength characteristics, and significant extensibility. For the application of the above material in the structural elements of sleepers of logging railways, it is necessary to know its operation under repeated loading. Endurance experiments were conducted at different coefficients of the load application cycle asymmetry pb=0,1; 0,3; 0,6. As a result of the experiments, the values of the endurance limit of the material under study were obtained, which allow us to conclude that it can be used in the construction of timber railway sleepers.

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Nagao, Akihide, Nobuyuki Ishikawa, and Toshio Takano. "Hydrogen Compatibility and Suitability of (Ni)-Cr-Mo High-Strength Low-Alloy Seamless Line Pipe Steels for Pressure Vessels for Hydrogen Storage." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84726.

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Cr-Mo and Ni-Cr-Mo high-strength low-alloy steels are candidate materials for the storage of high-pressure hydrogen gas. Forging materials of these steels have been used for such an environment, while there has been a strong demand for a higher performance material with high resistance to hydrogen embrittlement at lower cost. Thus, mechanical properties of Cr-Mo and Ni-Cr-Mo steels made of quenched and tempered seamless pipes in high-pressure hydrogen gas up to 105 MPa were examined in this study. The mechanical properties were deteriorated in the presence of hydrogen that appeared in reduction in local elongation, decrease in fracture toughness and accelerated fatigue-crack growth rate, although the presence of hydrogen did not affect yield and ultimate tensile strengths and made little difference to the fatigue endurance limit. It is proposed that pressure vessels for the storage of gaseous hydrogen made of these seamless line pipe steels can be designed.

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Spitsen, R., D. Kim, B. Flinn, M. Ramulu, and E. T. Easterbrook. "The Effects of Post-Weld Cold Working Processes on the Fatigue Strength of Low Carbon Steel Resistance Spot Welds." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59759.

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The investigation on the use of a post-weld cold working process to improve fatigue strength of low carbon steel resistance spot welds is presented. The cold working process generates uniform and consistent large zones of compressive residual stresses in resistance spot-welded low carbon steel structures using a specially designed indentation device. The effect of the indentation process parameters on the mechanical properties of the resistance spot-weld was investigated. Comparisons of the mechanical properties and qualitative results between the as-resistance spot-welded specimens and the post-weld cold worked resistance spot-welded specimens have been made in this investigation. Fatigue testing was also conducted to evaluate the effect of post-weld cold working process on the fatigue characteristics of resistance spot welds. Preliminary results showed that a significant improvement in the fatigue endurance limit has been achieved through the post-weld cold working process.

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Stone, Daniel H., Francisco Robles, and Geoffrey Dahlman. "Effects of Microvoids, Oxide Inclusions, and Sulfide Inclusions of the Fatigue Strength of Wheel Steels." In ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/jrc/ice2007-40011.

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The effects of microscopic discontinuities on reducing the fatigue strength of steels are well known. This paper will attempt to quantify the reduction of fatigue strength due to measured quantities of microvoids, oxide inclusions, and sulfide inclusions of the fatigue strength of wheel steels. Murikami and Endo have derived a model that relates the effects of void and inclusion area and hardness on the fatigue endurance limit. In the present work is presented a unique analysis where the effect of microcleanliness is investigated. The Murikami model was used for simplicity and because the goal in this publications is to demonstrate that inclusions play an important role on wheel performance. This work summarizes the microcleanliness analysis of 113 wheels; most of such wheels were removed from revenue service due to failure. The nature of the failure indicates that the wheels failed due to a fatigue related problem. For these reason, it is of paramount interest to determine the effects of defects (i.e. voids or inclusions) on wheel performance. For this reason a simple model (Murikami) was employed to quantify the effect of defects that were measured using the microanalysis.

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Mahajerin, Enayat, and Gary Burgess. "Determination of the Three-Parameter Weibull Distribution and Confidence Bands From Experimental Fatigue Strength Data." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2759.

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The S-N curve for the material used to make a pressure vessel is approximate because it is drawn from a limited number of test specimens. The resulting curve may be in error due to a variety of factors including surface condition, size, environment conditions, and stress concentrations. As a result, when the fatigue strength like the endurance limit is determined from the S-N curve by observing a definite break in the curve, it will be subject to error. Because of these uncertainties, it is necessary to use appropriate statistical methods to interpret the test results. In this paper, it is assumed that the percentage of failures for a given service life can be approximated by a three-parameter Weibull distribution. The Weibull distribution is flexible and has been shown to be suitable for structural reliability. The distribution is fitted to experimental data using a least square best fit approach applied to a discrete version of the cumulative probability distribution function, F(x). In practice a point-by-point estimate of the cumulative distribution function is used. As a result, it is necessary to establish confidence bands. The true curve of F(x) lies within these bands for a given probability.

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Reports on the topic "Limit of endurance strength"

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Waggoner, Roy C. Simultaneous Strength and Endurance Training. Fort Belvoir, VA: Defense Technical Information Center, April 1999. http://dx.doi.org/10.21236/ada363882.

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Tharion, W. J., T. M. Raunch, S. R. Strowman, and B. L. Shikitt. The Psychological Attributes of Ultramarathon Runners and Factors Which Limit Endurance. Fort Belvoir, VA: Defense Technical Information Center, April 1987. http://dx.doi.org/10.21236/ada185015.

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Guo, Zhen. The limit of strength and toughness of steel. Office of Scientific and Technical Information (OSTI), December 2001. http://dx.doi.org/10.2172/792953.

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Brittany Hollerbach, Brittany Hollerbach. A Comparison of Muscular Strength, Power, and Endurance Between CrossFit and Traditional Weight Training Classes. Experiment, August 2017. http://dx.doi.org/10.18258/9745.

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Li, Yao, Shuang Hu, Hongyu Chen, Minyi Zhang, and Yan Liu. Effect of multicomponent exercise on muscle strength, muscle endurance, and balance of frail older adults: A meta-analysis of randomized controlled trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2021. http://dx.doi.org/10.37766/inplasy2021.11.0103.

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Dubois, Diego, Amirali Eskandariyun, Suprabha Das, Andriy Durygin, and Zhe Cheng. Flash Sintering of Commercial Zirconium Nitride Powders. Florida International University, October 2021. http://dx.doi.org/10.25148/mmeurs.009777.

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Flash sintering is an electrical field-assisted densification technique that requires passing a current through a ceramic powder compact. Pressure-assisted flash sintering of commercially available Zirconium Nitride (ZrN) powders has been demonstrated. Near fully dense samples can be obtained within a short period of time. The influences of parameters such as electrical field strength, voltage ramping rate, current limit, external pressure, pre-heating, and holding time on the onset of the flash event were investigated. Some post-flash sintered samples were subjected to the same condition to observe if the material would experience repeated flash. In addition, material properties such as density and hardness were measured and correlated with SEM and XRD. Implications of the observations on underlying flash sintering mechanism will also be discussed.

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Delmer, Deborah, Nicholas Carpita, and Abraham Marcus. Induced Plant Cell Wall Modifications: Use of Plant Cells with Altered Walls to Study Wall Structure, Growth and Potential for Genetic Modification. United States Department of Agriculture, May 1995. http://dx.doi.org/10.32747/1995.7613021.bard.

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Our previous work indicated that suspension-cultured plant cells show remarkable flexibility in altering cell wall structure in response either to growth on saline medium or in the presence of the cellulose synthesis inhibitor 2,-6-dichlorobenzonitrile (DCB). We have continued to analyze the structure of these modified cell walls to understand how the changes modify wall strength, porosity, and ability to expand. The major load-bearing network in the walls of DCB-adapted dicot cells that lack a substantial cellulose-xyloglucan network is comprised of Ca2+-bridged pectates; these cells also have an unusual and abundant soluble pectic fraction. By contrast, DCB-adapted barley, a graminaceous monocot achieves extra wall strength by enhanced cross-linking of its non-cellulosic polysaccharide network via phenolic residues. Our results have also shed new light on normal wall stucture: 1) the cellulose-xyloglucan network may be independent of other wall networks in dicot primary walls and accounts for about 70% of the total wall strength; 2) the pectic network in dicot walls is the primary determinant of wall porosity; 3) both wall strength and porosity in graminaceous monocot primary walls is greatly influenced by the degree of phenolic cross-linking between non-cellulosic polysaccharides; and 4) the fact that the monocot cells do not secrete excess glucuronoarabinoxylan and mixed-linked glucan in response to growth on DCB, suggests that these two non-cellulosic polymers do not normally interact with cellulose in a manner similar to xyloglucan. We also attempted to understand the factors which limit cell expansion during growth of cells in saline medium. Analyses of hydrolytic enzyme activities suggest that xyloglucan metabolism is not repressed during growth on NaCl. Unlike non-adapted cells, salt-adapted cells were found to lack pectin methyl esterase, but it is not clear how this difference could relate to alterations in wall expansibility. Salt-adaped cell walls contain reduced hyp and secrete two unique PRPP-related proteins suggesting that high NaCl inhibits the cross-linking of these proteins into the walls, a finding that might relate to their altered expansibility.

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