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Journal articles on the topic 'Roll Failure'

Author: Grafiati

Published: 25 June 2021

Last updated: 10 February 2022

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1

Babakr, A., R. Bradley, and A. Al-Ahmari. "Failure Analysis of Mill Shaft Roll." Journal of Failure Analysis and Prevention 9, no. 2 (February 13, 2009): 107–13. http://dx.doi.org/10.1007/s11668-009-9215-4.

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2

孙, 小平. "Failure Analysis of Air Cooled Turning Roll." Metallurgical Engineering 07, no. 03 (2020): 195–202. http://dx.doi.org/10.12677/meng.2020.73027.

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3

HENMI, Nobuhiko, and Masaki KUROIWA. "G170015 Diagnostic method for slowly rotating roll bearing failure." Proceedings of Mechanical Engineering Congress, Japan 2012 (2012): _G170015–1—_G170015–5. http://dx.doi.org/10.1299/jsmemecj.2012._g170015-1.

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4

Krawczyk, Janusz, and Jerzy Pacyna. "THE ROLE OF METALLURGICAL DEFECTS AND MICROSTRUCTURE ON FAILURE FORMATION IN ROLL NECKS OF CAST IRON ROLLS." Metallurgy and Foundry Engineering 33, no. 2 (2007): 89. http://dx.doi.org/10.7494/mafe.2007.33.2.89.

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5

Harrer, W., R. Morrell, and R. Danzer. "Failure Analysis on a Compaction Roll made of Silicon Nitride." Practical Metallography 56, no. 4 (April 15, 2019): 262–75. http://dx.doi.org/10.3139/147.110568.

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6

Fu, Han-guang, Qiang Zhou, and Ming-shan Dai. "Failure Mechanism of Reflow Conductor Roll of Electroplating Tinning Line." Journal of Iron and Steel Research International 13, no. 2 (February 2006): 33–36. http://dx.doi.org/10.1016/s1006-706x(06)60040-x.

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7

Zhang, Jianglong, Zheng Zhang, Han Yang, and Shifu Wang. "Fatigue and fracture failure analysis of a twin-roll press." Engineering Failure Analysis 90 (August 2018): 585–96. http://dx.doi.org/10.1016/j.engfailanal.2018.02.010.

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8

Cruces, Diego, Cristiano Germani, and Tomislav Prokopec. "Failure of the stochastic approach to inflation beyond slow-roll." Journal of Cosmology and Astroparticle Physics 2019, no. 03 (March 29, 2019): 048. http://dx.doi.org/10.1088/1475-7516/2019/03/048.

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9

Domazet, Željko, Francisko Lukša, and Miro Bugarin. "Fatigue Strength of the Rolls with Grooves." Applied Mechanics and Materials 459 (October 2013): 330–34. http://dx.doi.org/10.4028/www.scientific.net/amm.459.330.

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In Steelworks Split failures of the rolls with grooves on the 3-high-roughing mill stand occurred four times. Detailed analysis of all the elements which influenced the failure was carried out. Stress analysis shownthatthe most critical area of the roll is the 7.a caliber what is corresponding with fracture positions. The fatigue strength of the material in the caliber groove for fatigue life prediction was missing and fatigue strength is determined by experimental testing.

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10

Huang, Li Rong, Fei Fei Liu, and Yu Hang Chen. "Failure Analysis of Hard Alloy Roll Rings and their Repairing Technology." Advanced Materials Research 476-478 (February 2012): 2599–602. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.2599.

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Roll rings are important parts in bars, and wire rolling, and their number consumed is large. They can fail and fracture due to defects of their own material and poor working conditions. There are many measures to prolong service life of roll rings, for example, their correct use and maintenance, suitable material, advanced manufacturing technology, and well machining quality, but mixed wear is inevitable. Such problems as surface defects and negative deviation of roll’s diameter caused by mixed wear can be solved by advanced repairing technology to make them meet users’ requirements, and prolong service life.

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11

Azevedo, Thiago Figueiredo, Cristiane Ramos dos Santos, Ricardo Estefany Aquino de Souza, Eduardo Kirinus Tentardini, and Sandro Griza. "Failure analysis of the repair procedure of an ore compactor roll." Engineering Failure Analysis 31 (July 2013): 195–202. http://dx.doi.org/10.1016/j.engfailanal.2013.02.010.

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12

Li, Huaguan, Jingming Tian, Weijie Fei, Zhengdong Han, Gang Tao, Yingmei Xu, Xiaocun Xu, and Jie Tao. "Spring-back and failure characteristics of roll bending of GLARE laminates." Materials Research Express 6, no. 8 (May 24, 2019): 0865b2. http://dx.doi.org/10.1088/2053-1591/ab2109.

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13

Dey, Arthita, Arvind Jha, Us Goel, Tanmay Bhttacharyya, and Sandip Bhattacharyya. "Failure of high-chromium iron roll in compact strip production MILL." Case Studies in Engineering Failure Analysis 1, no. 3 (July 2013): 186–91. http://dx.doi.org/10.1016/j.csefa.2013.05.007.

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14

Leterrier, Yves, Albert Pinyol, Luc Rougier, Judith H. Waller, Jan-Anders Månson, Pierre J. J. Dumont, Jānis Andersons, et al. "Influences of roll-to-roll process and polymer substrate anisotropies on the tensile failure of thin oxide films." Thin Solid Films 518, no. 23 (September 2010): 6984–92. http://dx.doi.org/10.1016/j.tsf.2010.07.033.

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15

Lee, Sung, Hoon Yi, Cheol Park, Hoon Jeong, and Moonkyu Kwak. "Continuous Tip Widening Technique for Roll-to-Roll Fabrication of Dry Adhesives." Coatings 8, no. 10 (September 30, 2018): 349. http://dx.doi.org/10.3390/coatings8100349.

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In this study, we reported continuous partial curing and tip-shaped modification methods for continuous production of dry adhesive with microscale mushroom-shaped structures. Typical fabrication methods of dry adhesive with mushroom-shaped structures are less productive due to the failure of large tips on pillar during demolding. To solve this problem, a typical pillar structure was fabricated through partial curing, and tip widening was realized through applying the proper pressure. Polyurethane acrylate was used in making the mushroom structure using two-step UV-assisted capillary force lithography (CFL). To make the mushroom structure, partial curing was performed on the micropillar, followed by tip widening. Dry adhesives with properties similar to those of typical mushroom-shaped dry adhesives were fabricated with reasonable adhesion force using the two-step UV-assisted CFL. This production technology was applied to the roll-to-roll process to improve productivity, thereby realizing continuous production without any defects. Such a technology is expected to be applied to various fields by achieving the productivity improvement of dry adhesives, which is essential for various applications.

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16

Savagatrup, Suchol, Adam D. Printz, Timothy F. O'Connor, Aliaksandr V. Zaretski, Daniel Rodriquez, Eric J. Sawyer, Kirtana M. Rajan, Raziel I. Acosta, Samuel E. Root, and Darren J. Lipomi. "Mechanical degradation and stability of organic solar cells: molecular and microstructural determinants." Energy & Environmental Science 8, no. 1 (2015): 55–80. http://dx.doi.org/10.1039/c4ee02657h.

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The mechanical properties of organic semiconductors and the mechanical failure mechanisms of devices play critical roles in the yield of modules in roll-to-roll manufacturing and the operational stability of organic solar cells.

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17

Wang, Yun, Xiao Xia Ning, and Hong Peng Jing. "Math Modules Establish for BUR Edge Chamfer and its Grinding Process." Advanced Materials Research 690-693 (May 2013): 2460–63. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.2460.

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This paper analyzes the reasons that lead to edge failure on back-up roll and puts forward the countermeasures. The corresponding mathematical model of present grinding curve is designed, in order to adapt reconstructed roll.

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18

Xin, Li Jun, Tao Huang, and Zhi Yong Wang. "Failure Analysis of Welding Joints of CQ Steel." Advanced Materials Research 328-330 (September 2011): 176–80. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.176.

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In order to implement continuous roll of steel plates, steel plates need to be jointed simply and reliably. CQ steel plates have advantages such as low impurity, composition uniformity, excellent surface quality and good mechanical properties. However, there always has fracture failure of the online welded joint for continuous cool-roll CQ plates. For solving this question, theoretical calculation of weldability, fracture morphology and metallurgical structure were analyzed. The results show that CQ steel plates have good weldability according to the chemical composition, and the microstructure of welding seam are mainly ferrite and a small amount of lath martensite.While grain growth in HAZ is serious, with average grain size 15μm. A lot of impurities and gas cavities in welding seam are the main source of cracks. In addition, stress concentration caused by coarse grain zone in HAZ is one of the reasons for causing cracks. The microhardness was test and the results show that the hardness decrease from weld center to the base metal and there is a minimal value where is softened zone.

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19

Wang, Hai Rui, Ya Li, Jian Ying Wang, and Yong Yi Liao. "The Process Improvement of KISC Roll Collar Grinder." Applied Mechanics and Materials 437 (October 2013): 744–47. http://dx.doi.org/10.4028/www.scientific.net/amm.437.744.

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CNC roll grinder, which must be carried out comprehensive analysis in the repair process, is a complex mechanical and electrical integration products . Especially in terms of the mechanical behaviors of the machine tool, performance failure analysis must be carefully. In this paper, the KISC HERKULES grinder analysis of existing fault and improve maintenance. Examples are presented below, for the repair technology.

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20

NA, D. H., and Y. LEE. "FE SIMULATION OF EDGE CRACK INITIATION AND PROPAGATION OF CONVENTIONAL GRAIN ORIENTATION ELECTRICAL STEEL." International Journal of Modern Physics B 22, no. 31n32 (December 30, 2008): 5465–70. http://dx.doi.org/10.1142/s0217979208050668.

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Three-dimensional finite element simulation has been carried out to understand better the crack initiation and growth at the edge side of silicon steel sheet during cold rolling, which is attributable to elastic deformation of work roll, i.e., roll bending. Strain-controlled failure model was coupled with finite element method and a series of FE simulation has been carried out while three different roll bending modes are considered. FE simulation shows that the negative roll bending mode during rolling affects significantly the crack initiation behavior. When the strain for failure was reduced by 20%, number of elements removed was increased by about 305%. If an initial crack with 2.5mm in length was assumed on the strip, the initial edge crack propagated toward inner region of strip and the propagated length is about 10times of the initial edge crack length.

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21

Vandre, Eric, Marcio S. Carvalho, and Satish Kumar. "Delaying the onset of dynamic wetting failure through meniscus confinement." Journal of Fluid Mechanics 707 (July 30, 2012): 496–520. http://dx.doi.org/10.1017/jfm.2012.295.

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AbstractDynamic wetting is crucial to processes where liquid displaces another fluid along a solid surface, such as the deposition of a coating liquid onto a moving substrate. Numerous studies report the failure of dynamic wetting past some critical process speed. However, the hydrodynamic factors that influence the transition to wetting failure remain poorly understood from an empirical and theoretical perspective. The objective of this investigation is to determine the effect of meniscus confinement on the onset of dynamic wetting failure. A novel experimental system is designed to simultaneously view confined and unconfined wetting systems as they approach wetting failure. The experimental apparatus consists of a scraped steel roll that rotates into a bath of glycerol. Confinement is imposed via a gap formed between a coating die and the roll surface. Flow visualization is used to record the critical roll speed at which wetting failure occurs. Comparison of the confined and unconfined data shows a clear increase in the relative critical speed as the meniscus becomes more confined. A hydrodynamic model for wetting failure is developed and analysed with (i) lubrication theory and (ii) a two-dimensional finite-element method (FEM). Both approaches do a remarkable job of matching the observed confinement trend, but only the two-dimensional model yields accurate estimates of the absolute values of the critical speeds due to the highly two-dimensional nature of the stress field in the displacing liquid. The overall success of the hydrodynamic model suggests a wetting failure mechanism primarily related to viscous bending of the meniscus.

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22

Lengauer, Markus, Robert Danzer, Domagoj Rubeša, Walter Harrer, and W. Zleppnig. "Failure Analysis of Si₃N₄ Rolls for Wire Hot Rolling by Numerical Simulation of Thermal and Mechanical Stresses." Key Engineering Materials 290 (July 2005): 94–101. http://dx.doi.org/10.4028/www.scientific.net/kem.290.94.

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Silicon nitride rolls for wire hot rolling have been tested in the rolling mill. After short employment for processing of ultra-high strength materials, cracks appeared in the roll calibre, which limited further application of the rolls. In order to find out possible causes for the damage, relevant mechanical properties of the roll have been determined and thermally and mechanically induced stresses were assessed by numerical simulation. It has been found that thermal stresses are of little relevance, whereas mechanically induced stresses are high enough to enhance subcritical crack growth resulting in the development of the macroscopic cracks, so that the observed damage of the rolls could have been adequately explained. One further result of the analysis was that flaws induced by grinding are decisive for the service time of ceramic rolls, so that special attention has to be paid to the machining of the roll calibre.

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23

Yu, Haranich, Frolov Ya, Grydin O, Voswinkel D, Andreiev A, and Remez O. "Failure mode of reinforcing steel mesh in aluminum roll bonded composite material." Theory and practice of metallurgy 1, no. 1 (January 21, 2019): 29–34. http://dx.doi.org/10.34185/tpm.1.2019.03.

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Flat roll-bonded aluminum 6060 composite materials with reinforcing steel inlets made of woven wire mesh (AISI 321) and expanded mesh (AISI 304) have been produced at 20 % and 30 % reduction. The roll bonding process has been performed at 400 and 500℃. After the process the composites were peeled and their interfaces were subsequently studied via SEM microscopy. In all cases the fracture of mesh inlets has been observed. The analysis of the failure mode has shown that the fracture of woven wire mesh corresponds to that described by other researchers. At the same time, the failure mode of expanded mesh inlet was presented in this study is characterized by a significant amount of brittle fracture at the region between strands and knuckles of expanded mesh. In order to analyze a stress state in these regions, the simulation using the finite element method (FEM) was set up by means of QForm software. The thermal and deformational conditions corresponded to experimental ones. It was shown that the von Mises stress reaches a significant magnitude up to the strength of austenitic steel. At the same time, a study of initial micro hardness of expanded mesh was conducted. The study revealed a significant work-hardening in the region of knuckles due to manufacturing procedure of expanded mesh and this seems to be the most important cause of destruction. In order to avoid such fracture, the annealing of expanded mesh was proposed. Presented results show a significant decrease of hardness and therefore an opportunity plastic deformation of expanded steel mesh.

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24

Ma, Qiancai, Fengjie Gao, Yang Wang, Qiuxiong Gou, and Liangyu Zhao. "A Robust Roll Stabilization Controller with Aerodynamic Disturbance and Actuator Failure Consideration." Computer Modeling in Engineering & Sciences 122, no. 1 (2020): 109–30. http://dx.doi.org/10.32604/cmes.2020.08109.

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25

Nguyen, H., W. Böhm, I. Tsoupis, M. Göken, H. W. Höppel, C. Schmidt, T. Hausöl, M. Ruppert, and M. Merklein. "Tailored heat treated accumulative roll bonded aluminum blanks: failure under bending stresses." Production Engineering 10, no. 4-5 (June 18, 2016): 399–407. http://dx.doi.org/10.1007/s11740-016-0685-4.

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26

Pantazopoulos, G., S. Zormalia, and A. Vazdirvanidis. "Investigation of Fatigue Failure of Roll Shafts in a Tube Manufacturing Line." Journal of Failure Analysis and Prevention 10, no. 5 (June 15, 2010): 358–62. http://dx.doi.org/10.1007/s11668-010-9369-0.

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27

Shi, Yafei, Jinyu Tong, Qiankun Zheng, Sihong Rao, Huijin Jin, and Sixian Rao. "Analysis About the Failure Mechanism of the Sleeves in Sink Roll System." Journal of Failure Analysis and Prevention 18, no. 1 (January 16, 2018): 183–88. http://dx.doi.org/10.1007/s11668-018-0395-7.

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28

Kishore, Kaushal, and Goutam Mukhopadhyay. "Root Cause Failure Analysis of Pinch Roll Bearing at Hot Strip Mill." Journal of Failure Analysis and Prevention 19, no. 1 (January 24, 2019): 219–29. http://dx.doi.org/10.1007/s11668-019-00593-2.

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29

Krzyzanowski, M., J. H. Beynon, and C. M. Sellars. "Analysis of secondary oxide-scale failure at entry into the roll gap." Metallurgical and Materials Transactions B 31, no. 6 (December 2000): 1483–90. http://dx.doi.org/10.1007/s11663-000-0033-z.

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30

Jois, Ramesh, Stefano Carini, Abishek Kalia, Olga Harris, Rani Thind, Sean Desmond, and Riccardo Audisio. "ROLL failure rates for occult breast lesions: What lessons learnt – internal audit." European Journal of Surgical Oncology (EJSO) 39, no. 5 (May 2013): 481. http://dx.doi.org/10.1016/j.ejso.2013.01.107.

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31

Echtle, Ludmila, and Hermann Müller. "Schadensuntersuchung an einem gerissenen Walzenmantel / Failure Examination of a Cracked Roll Sleeve." Practical Metallography 36, no. 1 (January 1, 1998): 22–28. http://dx.doi.org/10.1515/pm-1998-360105.

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32

Mottahedi, Ali Akbar. "Investigation of Phase Transformation of Forged Steel Cold Rolls due to Heat Affecting and Prevent its Failure." Defect and Diffusion Forum 289-292 (April 2009): 219–24. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.219.

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In rolling Industries, cold rolls are chosen of low alloy steel heat treated to about 60 RC in 50 millimeter depth on surface. Troostite phase which happens in some cases in tempered martensite has lower fracture toughness, although its ductility is a little more. In rolling process, some technological problems seldom take place, and the roll might be locally heated accidentally. In cold rolling technology, this effect may cause a phase change in metallurgical structure on the surface of the cold work forged steel rolls, named Troostite. However, the rolls which subjected to this problem have no mechanical defect to be detected by NDT, but these kinds of affected rolls may be failed in working (rolling) by fracture, spalling or cracks. So Troostite is a harmful phase for rolls and causes lots of losses for rolling companies. The following paper is a practical industrial approach to show and follow thermal instability of roll surface and metallurgical change of the surface from sorbite to troostite by diffusion mechanism, due to any improper mill usage.

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33

Rees, D. W. A. "Rim and pole failures from elliptical bulging of oriented orthotropic sheet metal." Journal of Strain Analysis for Engineering Design 35, no. 2 (February 1, 2000): 109–20. http://dx.doi.org/10.1243/0309324001514062.

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Two criteria of instability are required to predict the failure in rolled sheet metal when bulged by lateral pressure through elliptical dies. The attainment of a pressure maximum is observed when the ratio of the lengths of the ellipse axes approaches unity. In nearly circular bulges this marks the onset of failure by diffuse necking under a falling pressure in the polar region. Dies with sharper elliptical apertures produce plane strain failures under a rising pressure in the region of the rim. In stretching flat sheet a local instability occurs when the rim force attains its maximum. The influence of sheet curvature upon plane strain fracture alters the limiting strain. Predictions of the critical pressure are derived for each failure and applied to an automotive aluminium alloy sheet (Alusuisse AC 120). The theory confirms experiments that show plane strain failure as a cut-off point in the plot of pressure versus height. A maximum pressure marks the start of a failure by diffuse pole thinning. In contrast, edge failures occur with uniform thinning from pole to rim along the minor axis of the ellipsoid bulge. A generalized theoretical approach accounts for each failure with an r variation in the plane of the sheet and orientation of the ellipse axes to the rolling direction. The tests reported refer to alignments between the roll direction and both axes of five elliptical dies with different aspect ratios. Pole failures provide positive forming limit strains for biaxial stress ratios between 0.5 and 1. Rim failures supply the limiting plane strains.

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34

Noda, Nao-Aki, Yoshikazu Sano, Mohd Aridi, Kenji Tsuboi, and Nozomu Oda. "Residual Stress Differences between Uniform and Non-Uniform Heating Treatment of Bimetallic Roll: Effect of Creep Behavior on Residual Stress." Metals 8, no. 11 (November 15, 2018): 952. http://dx.doi.org/10.3390/met8110952.

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The work roll is one of the most important tools in the steel rolling industry. Work rolls are used under extremely severe conditions such as high temperature, high loading, and an aggressive atmosphere. To meet those demands, bimetallic rolls have recently been used to replace conventional single material rolls. Usually, a compressive residual stress is introduced to prevent surface cracking. However, a tensile residual stress at the center appears to balance the compressive residual stress. This center residual stress sometimes causes roll failure. In this paper, therefore, a simulation is performed using the finite element method (FEM) for the quenching process of the bimetallic roll by considering the creep behavior. Then the effect of pre-heating conditions is discussed. The results show that the maximum stress point for the tensile stress at the roll center for non-uniform heating is 24% less than that achieved with uniform heating, although the same compressive stresses appear at the surface. Then, using different work roll diameters, the center tensile residual stress for non-uniform heating is found to be smaller than the uniform heating. Also, it is found that the area ratios of the shell-core only have a small influence on the residual stress of the bimetallic roll for both heating treatments.

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35

Huber, Markus, Ulrich Rüde, and Barbara Wohlmuth. "Adaptive control in roll-forward recovery for extreme scale multigrid." International Journal of High Performance Computing Applications 33, no. 5 (December 25, 2018): 817–37. http://dx.doi.org/10.1177/1094342018817088.

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With the increasing number of compute components, failures in future exa-scale computer systems are expected to become more frequent. This motivates the study of novel resilience techniques. Here, we extend a recently proposed algorithm-based recovery method for multigrid iterations by introducing an adaptive control. After a fault, the healthy part of the system continues the iterative solution process, while the solution in the faulty domain is reconstructed by an asynchronous online recovery. The computations in both the faulty and the healthy subdomains must be coordinated in a sensitive way, in particular, both under- and over-solving must be avoided. Both of these waste computational resources and will therefore increase the overall time-to-solution. To control the local recovery and guarantee an optimal recoupling, we introduce a stopping criterion based on a mathematical error estimator. It involves hierarchically weighted sums of residuals within the context of uniformly refined meshes and is well-suited in the context of parallel high-performance computing. The recoupling process is steered by local contributions of the error estimator before the fault. Failure scenarios when solving up to 6.9 × 1011 unknowns on more than 245,766 parallel processes will be reported on a state-of-the-art peta-scale supercomputer demonstrating the robustness of the method.

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36

OHKOMORI, Yoshihiro, Chu SAKAE, and Yukitaka MURAKAMI. "Analysis of Mode II Crack Growth Behavior in Spalling Failure of Backup Roll." Journal of the Society of Materials Science, Japan 50, no. 3 (2001): 249–54. http://dx.doi.org/10.2472/jsms.50.249.

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37

Palit, Piyas, Subodh Nath Patel, Jitendra Mathur, and Sandeep Shenoy. "Analysis of a Progressive Failure of a Work Roll in Hot Strip Mill." Journal of Failure Analysis and Prevention 19, no. 5 (August 19, 2019): 1297–303. http://dx.doi.org/10.1007/s11668-019-00688-w.

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38

SONG, Jinchao, Shuxing YANG, and Fenfen XIONG. "Control failure of the roll-isolated inertial navigation system under large pitch angle." Chinese Journal of Aeronautics 33, no. 10 (October 2020): 2707–15. http://dx.doi.org/10.1016/j.cja.2019.08.026.

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39

Kim, D. H., Y. Lee, S. J. Yoo, W. Y. Choo, and B. M. Kim. "Prediction of the wear profile of a roll groove in rod rolling using an incremental form of wear model." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 217, no. 1 (January 1, 2003): 111–26. http://dx.doi.org/10.1243/095440503762502323.

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A model for predicting the wear profile of the ductile cast iron roll during rod (or bar) rolling is proposed using Archard's wear equation. Archard's wear equation was reformulated as an incremental form and the hardness of the roll was expressed as a function of rolling time under a high temperature. The wear profile of the roll is calculated at each deformation step by consideration of relative sliding velocity and normal roll pressure at contact area. The coefficients required in the proposed wear model have been obtained using the high-temperature wear tester of pin-on-disc type. A three-dimensional finite element analysis coupled with the proposed wear model has been carried out for the oval-round pass rolling sequence widely used in present continuous rod (or bar) rolling mills. To describe the deformation behaviour of material at the roll/material interface better, a contact-searching algorithm that can be applied efficiently to the finite element mesh was also suggested. The results showed that, for an oval groove, the maximum wear occurs at the centre part of the roll and, for a round groove, at the shoulder area of the roll. The wear profiles moves to the spread direction of workpiece (i.e. roll axis direction) as well as the direction of roll centre as the production (tonnage) increases. The proposed wear model might be used for adjusting the gap (pass height) of rolls to set up a suitable rolling schedule for keeping dimensional tolerance of the product and avoid catastrophic failure of rolls after rolling a characteristic tonnage.

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40

Uchida, Shu Hei, Ippei Takeuchi, Gentaro Gonda, Kinji Hirai, Tokuteru Uesugi, Yorinobu Takigawa, and Kenji Higashi. "Mechanical Properties of Twin Roll Cast AZ91 Magnesium Alloy at Room Temperature." Advanced Materials Research 26-28 (October 2007): 145–48. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.145.

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Twin roll casting process combines casting and hot rolling into a single process. In this study, mechanical properties at room temperature and microstructure of the twin roll cast AZ91 magnesium alloy are investigated. The alloy exhibited a good combination of high ultimate strength of 343MPa, yield stress of 224MPa and elongation to failure of 13%. The mechanical property was very excellent compared with AZ91 die-cast alloy. EPMA analysis reveals that the Al concentration in Mg matrix is higher in twin roll cast alloy than that in die-cast alloy. This high Al concentration must be the origin of the good mechanical properties of twin roll cast alloy at room temperature.

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41

Ceschini, Lorella, Mohamad El Mehtedi, Alessandro Morri, Giuliano Sambogna, and S. Spigarelli. "Superplastic Deformation of Twin Roll Cast AZ31 Magnesium Alloy." Materials Science Forum 604-605 (October 2008): 267–77. http://dx.doi.org/10.4028/www.scientific.net/msf.604-605.267.

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The aim of the present work was to evaluate the potential for superplastic deformation of the AZ31 magnesium alloy produced by Twin Roll Casting (TRC), a continuous casting technology able to convert molten metals directly into a coiled strip. In order to develop a superplastic microstructure, the TRC sheets were heated at 400 °C for 2 h, then rolled by multiple passes with re-heating between them, with a total thickness reduction of about 60%. The superplastic behaviour of the alloy was studied by tensile tests, carried out at in the temperature range from 400 °C to 500 °C and with initial strain rates of 1•10-3 s-1 and 5•10-4 s-1. The microstructural and fractographic characterization of the alloy was carried out by means of optical (OM) and scanning electron microscopy (SEM). The tensile tests evidenced a superplastic behaviour of the processed AZ31 Mg alloy, with a maximum elongation to failure of about 500% at 460 °C, with a strain rate of 5•10-4 s-1. The microstructure of the alloy after superplastic deformation showed fine and equiaxed grains, with a large fraction of high angle boundaries. Analyses of the fracture surfaces evidenced flow localization around the grains, suggesting that grain boundary sliding (GBS) was the main deformation mechanism. Failure occurred by cavitation, mainly at the higher testing temperature, due to the prevailing effect of grain growth.

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Maas, Allan, Tae Kyun Kim, Rolf K. Miehlke, Thomas Hagen, and Thomas M. Grupp. "Differences in Anatomy and Kinematics in Asian and Caucasian TKA Patients: Influence on Implant Positioning and Subsequent Loading Conditions in Mobile Bearing Knees." BioMed Research International 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/612838.

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The objective of our study was to determine the mechanical stress conditions under tibiofemoral loading with an overlay of knee kinematics in deep flexion on two different mobile bearing designs in comparison to in vivo failure modes. This study investigates the seldom but severe complication of fatigue failure of polyethylene components at mobile bearing total knee arthroplasty designs. Assuming a combination of a floor-based lifestyle and tibial malrotation as a possible reason for a higher failure rate in Asian countries we developed a simplified finite element model considering a tibiofemoral roll-back angle of 22° and the range of rotational motion of a clinically established floating platform design (e.motion FP) at a knee flexion angle of 120° in order to compare our results to failure modes found in retrieved implants. Compared to the failure mode observed in the clinical retrievals the locations of the occurring stress maxima as well as the tensile stress distribution show analogies. From our observations, we conclude that the newly introduced finite element model with an overlay of deep knee flexion (lateral roll-back) and considerable internally rotated tibia implant positioning is an appropriate analysis for knee design optimizations and a suitable method to predict clinical failure modes.

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Cvijović‐Alagić, Ivana, Vesna Maksimović, and Milan T. Jovanović. "Fractographic analysis of the aluminum matrix composite prepared by accumulative roll bonding." Metallurgical and Materials Engineering 26, no. 4 (November 12, 2020): 349–55. http://dx.doi.org/10.30544/569.

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Recent research in the material science field is focused on the easy-to-apply and cost-effective production of the structural components with enhanced mechanical properties. As an answer to these new trends in the present study, the inexpensive household aluminum foils are used to produce the multilayer aluminum matrix composite. The aluminum matrix composites are manufactured by hot-rolling of the sandwiched foils and afterward subjected to microstructural characterization and mechanical testing. Analysis of the produced composite microstructure and fracture surface obtained after tensile testing was performed using the scanning electron microscopy (SEM). The qualitative fractographic analysis revealed that the ductile fracture features prevail in the overall fracture mode of the investigated multilayer composite, while the quantitative fractographic investigation allowed more detailed insight into the composite failure process and depicted critical parameters that led to the composite failure.

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Pietryga, Michael, Johannes Lohmar, and Gerhard Hirt. "A New FE-Model for the Investigation of Bond Formation and Failure in Roll Bonding Processes." Materials Science Forum 854 (May 2016): 152–57. http://dx.doi.org/10.4028/www.scientific.net/msf.854.152.

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Roll bonding is a process to join two or more different materials permanently in a rolling process. A typical industrial application is the manufacturing of aluminum sheets for heat exchangers in cars where the solder is joined onto a base layer by roll bonding. From a modelling point of view the challenge is to describe the bond formation and failure of the different material layers within a FE-process model. Most methods established today either tie the different layers together or treat them as completely separate. The problem for both assumptions is that they are not applicable to describe the influence of tangential stresses that can cause layer shifting and occur in addition to the normal stresses within the roll gap. To overcome these restrictions in this paper a 2D FE-model is presented that integrates an adapted contact formulation being able to join two bodies that are completely separated at the start of the simulation. The contact formulation is contained in a user subroutine that models bond formation by adhesion in dependence of material flow and load. Additionally if the deformation conditions are detrimental already established bonds can fail. This FE-model is then used to investigate the process boundaries of the first passes of a typical rolling schedule in terms of achievable height reductions. The results show that passes with unfavorable height reduction introduce tensile and shear stresses that can lead to incomplete bonding or can even destroy the bond entirely. It is expected that, with adequate calibration, the developed FE-model can be used to identify conditions that are profitable for bond formation in roll bonding prior to production and hence can lead to shorter rolling schedules with higher robustness.

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Qian, Shanhua. "Experimental investigation of the tribological property of low viscosity lubricant under micro confined space." Industrial Lubrication and Tribology 67, no. 6 (September 14, 2015): 594–99. http://dx.doi.org/10.1108/ilt-02-2015-0017.

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Purpose – This paper aims to present the probable factors resulting in the lubrication failure in detail, based on the experimental study on the tribological property of the low-viscosity lubricant subjected to the different slide/roll ratios and loads under micro confined space. Design/methodology/approach – The interference images and the traction coefficients of the spindle oil with low viscosity were recorded using a ball-on-disc test rig. Moreover, the corresponding flash temperatures were obtained via an analytical method. Findings – More scratches can be observed in the interference images with higher slide/roll ratios. The applied load plays a significant role in the variation of the traction coefficient under different slide/roll ratio, and higher load resulted in lower traction coefficient. The flash temperature generated in the point contact zone non-linearly increases with increasing slide/roll ratio. Originality/value – The flash temperature is not a crucial factor which results in these scratches in the interference images. Moreover, it is probable that the micro confined space is in boundary lubrication at higher shear rates.

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Rad, Hamid Reza Bakhsheshi, Ahmad Monshi, Mohd Hasbullah Idris, Mohammed Rafiq Abdul Kadir, and Hassan Jafari. "Premature failure analysis of forged cold back-up roll in a continuous tandem mill." Materials & Design 32, no. 8-9 (September 2011): 4376–84. http://dx.doi.org/10.1016/j.matdes.2011.03.078.

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Sinha, Pankhuri, Shivanandan S. Indimath, Goutam Mukhopadhyay, and Sandip Bhattacharyya. "Failure of a Work Roll of a Thin Strip Rolling Mill: A Case Study." Procedia Engineering 86 (2014): 940–48. http://dx.doi.org/10.1016/j.proeng.2014.11.117.

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Qian, Shanhua, Dan Guo, Shuhai Liu, and Xinchun Lu. "Experimental Investigation of Lubrication Failure of Polyalphaolefin Oil Film at High Slide/Roll Ratios." Tribology Letters 44, no. 2 (August 18, 2011): 107–15. http://dx.doi.org/10.1007/s11249-011-9820-8.

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Johnston, Peter, Eric Duckers, Amish Raval, Thomas Cook, Jay Traverse, William Abraham, Peter Altman, and Carl Pepine. "TCT-747 The CardiAMP Heart Failure Study: First Results from Unblinded Roll-In Phase." Journal of the American College of Cardiology 72, no. 13 (September 2018): B299. http://dx.doi.org/10.1016/j.jacc.2018.08.1971.

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Sahraei, Elham, Michael Kahn, Joseph Meier, and Tomasz Wierzbicki. "Modelling of cracks developed in lithium-ion cells under mechanical loading." RSC Advances 5, no. 98 (2015): 80369–80. http://dx.doi.org/10.1039/c5ra17865g.

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This research reports on an experimental and numerical study of material failure in the electrode assemblies (i.e. “jelly roll” and/or “electrode stack”) of lithium-ion batteries after local mechanical loading.

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