Relevant bibliographies by topics / Cold Rolling

Academic literature on the topic 'Cold Rolling'

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Published: 4 June 2021
Last updated: 8 June 2024

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Journal articles on the topic "Cold Rolling"

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Slimani, K., M. Zaaf, and H. Bendjama. "Simplified Modelling of Tandem Cold Rolling." METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 40, no. 11 (December 20, 2018): 1509–20. http://dx.doi.org/10.15407/mfint.40.11.1509.

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OKAMOTO, Takahiko. "Development of Cold Rolling Oils and Research of Cold Rolling Tribology." Journal of the Japan Society for Technology of Plasticity 52, no. 611 (2011): 1286–87. http://dx.doi.org/10.9773/sosei.52.1286.

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Rakhmanov, S. R. "Dynamics control in pipe cold rolling mill main drive." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 3 (June 27, 2019): 355–64. http://dx.doi.org/10.32339/0135-5910-2019-3-355-364.

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Elimination of unstable and critical states of deformed systems of pipes pilger cold rolling mill, heavy-loaded equipment of which functions under conditionsof increase dynamic loads, is mainly intended for mechanic system dynamics stabilization until the accepted level of loading. Active mechanicties in the initial dynamic model revealed, which stipulate the demonstration of pronounced parametric processes in the studied system of pipes cold rolling mill main driver. Analysis of reasons of parametric oscillations originating carried out for systems of pipes cold rolling mill main driver. Zones of dynamic instability of mechanic system functioning according to Eins–Strett diagram determined, that enable to make the choice of passive optimal rolling regimes at the stage of technological processes designing of pipes pilger cold rolling.A system of active control by main driver of pipes cold rolling mill elaborated based on its mathematical model. A structure of optimal control by angular oscillations driver line elements of pipes cold rolling mill selected and parameters ofactive control impacts of the automated servo control system determined. A mechanism of optimal control by dynamic state ofdriver line elements of pipes cold rolling mill proposed. Also proposed an outline of critical and instablestates elimination for the main driver line driver of pipes cold rolling mill, which is realized by means of adaptive active automated servo control facility. The modernized main driver line of pipes cold rolling mill is equipped by facilities and control systems, enabling to switch the initial mechanic system from a critical state into a zone ofdesired states in a servo regime. Sensors of threshold moments level of elasticity forcesare installed on the drive shaft of main driver of pipes cold rolling mill. During the drive shaft angular elastic oscillations, comprising of actual and desired parameters of mechanicsystem is made based on sensors signals. Next, a correspondent control impact is formed based on algorithm embedded into the electric drive servo control system. When the displayed point of the drive shaft reaches the desired area of system dynamic stability, the active drive control is switched off. If further the disturbing load, applied from the side of deformation seat, makes the drive line dynamic characteristics off the desired status, then the dynamic system control process is repeated in anautomated mode. Reliability of the results received confirmed by calculation example and experiments at the main driver of pipes cold rolling mill ХПТ-32.
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Aanestad, A. "Simulation of cold rolling." Materials Science and Technology 2, no. 6 (June 1986): 620–24. http://dx.doi.org/10.1179/mst.1986.2.6.620.

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Fleck, N. A., K. L. Johnson, M. E. Mear, and L. C. Zhang. "Cold Rolling of Foil." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 206, no. 2 (May 1992): 119–31. http://dx.doi.org/10.1243/pime_proc_1992_206_064_02.

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A theory of cold rolling of thin gauge strip is presented which, within the idealizations of homogeneous deformation and a constant coefficient of Coulomb friction, rigorously models the elastic deformation of the rolls and the frictional traction at the interface. In contrast with classical theories (3) it is shown that, for gauges less than a critical value, plastic reduction takes place in two zones, at entry and exit, which are separated by a neutral zone in which the rolls are compressed fiat and there is no slip between the rolls and the strip. Roll load and torque are governed by five independent non-dimensional parameters which express the influence of gauge, reduction, friction and front and back tensions. Values of load and torque have been computed (for zero front and back tensions) for a wide range of thickness, reduction and friction and have been found to collapse approximately on to a single master curve.
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Ko, Kyung Jun, Hyung Ki Park, and Chan Hee Han. "The Effect of Cold Rolling Direction on the Secondary Recrystallization in Fe-3%Si Steel." Materials Science Forum 702-703 (December 2011): 591–94. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.591.

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In order to verify the origin of Goss nuclei for secondary recrystallization in Fe-3%Si steel, the effect of cold-rolling direction on the secondary recrystallization was examined in this study. The cold-rolling direction was rotated through 0 ~ 90 degrees about the hot-rolling direction on normal direction axis of hot-rolled sheet. In spite of the different initial texture before cold rolling, the 88% cold rolled texture was formed by similar α and γ fiber regardless of the rotation of cold rolling direction. Likewise, regardless of the cold rolling direction, the primary recrystallized sheets had a similar texture. In particular, the area fraction of Goss component (tolerance angle within 15º) in the primary recrystallized sheets was increased in the cold rolling condition of rotating through 60, 90 degrees from the hot rolling direction. After high temperature annealing at 1200°C, the secondary recrystallized grain was fully evolved in the all conditions. The sharpness of Goss texture in secondary recrystallized sheet was decreased as increasing the rotation angle of cold rolling direction.
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Cui, Feng Kui, Xuan Jing He, Chun Mei Li, Yan Li, and Zhi Ren Han. "Shaping Movement Analysis and Simulation of Ballscrew Manufactured by Cold Rolling." Advanced Materials Research 97-101 (March 2010): 4032–35. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.4032.

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According to the kinematics theory of part surface forming motion and engagement principle, shaping movement of ballscrew manufactured by cold rolling has been investigated. The motion relationship and mathematical model of ballscrew have been built. By means of ADAMS and MATLAB the motion simulation and numerical calculation of cold rolling have been done. From analysis results, motion relationships between roller and workpiece and forming principle of cold rolling have been revealed. These studies will provide quantitative basis for technologic research of cold rolling and promote the study of ballscrew’s cold rolling forming mechanism.
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Sudo, Masatoshi. "Effect of Rolling Friction on the Development of {111} Texture in A1050 Aluminium Sheets." Materials Science Forum 519-521 (July 2006): 1551–56. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1551.

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Commercially pure aluminum (A1050) sheets have been cold- rolled in vacuum, to obtain high friction between rolls and sheet. This cold-rolling in vacuum successfully introduced large shear deformation near the sheet surface. The shear strain is the highest at the sheet surface, and rapidly decreased to zero at the quarter thickness. These high shear strains are sufficient enough to produce {111} and {001} cold- rolling, or shear texture. Conventional cold-rolling texture such as (001) [100], is naturally observed at the mid-thickness. It is confirmed that a high shear strain and probably steep strain gradient through thickness have a sufficient effect on the increase in {111} cold-rolling texture near the sheet surface. {111} cold-rolling texture is proved to be effective in the evolution of {111} recrystallization texture. This development will be discussed based on the cold-rolling texture change.
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Li, Yong Tang, Jian Li Song, Da Wei Zhang, and Quan Gang Zheng. "Mechanics Analysis and Numerical Simulation on the Precise Forming Process of Spline Cold Rolling." Materials Science Forum 575-578 (April 2008): 416–21. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.416.

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The forming process of spline cold rolling was analyzed. The unit average pressure, contact area and rolling force in the cold rolling precision forming process were analyzed and solved. The mechanical and mathematical model has been set up on the basis of the analysis. The numerical simulation of spline cold rolling process was carried out. The results obtained by comparison of theoretical analysis, numerical simulation and experiment provide a theoretical basis for the study and application of spline cold rolling process.
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Kaiser, M. S. "PRECIPITATION AND SOFTENING BEHAVIOUR OF CAST, COLD ROLLED AND HOT ROLLING PRIOR TO COLD ROLLED AL-6MG ALLOY ANNEALED AT HIGH TEMPERATURE." Journal of Mechanical Engineering 45, no. 1 (July 30, 2015): 32–36. http://dx.doi.org/10.3329/jme.v45i1.24381.

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The effect of cast, cold rolling and hot rolling prior to cold rolling reduction on the hardness, electrical conductivity and grain size of annealed Al-6Mg alloys was studied. It was found that the hot rolling prior to cold rolling attend the higher strength due to precipitation of b-phase during hot rolling which hinder the dislocation movement. At higher temperature of annealing electrical resistivity decreses due to particle coarcening but in case of cast alloy it increases due to precipitation of b-phase. It is seen from the microstructure that the cold worked structures are comprised of elongated grains. It is also observed that the cold rolled alloy attained almost fully re-crystallized state after annealing at 400oC for 60 minutes.
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Dissertations / Theses on the topic "Cold Rolling"

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Morad, Antoni, and Faruk Travancic. "Control for Cold Rolling Mills." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97924.

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This report contains the details in a final research thesis work done rolling mill technology. The work is carried out at Heat Transfer located at Finspång. The main objective of this work is to evaluate thickness and flatness data from the profile to give an optimal start value for the pressure and force applied on the machine and the speed as well, so that the profiles produced, have the right thickness and best possible flatness. Thickness, start value for power, the degree of bending the profiles are set up and sent down to the control system. The report starts with a theory part describing the heating and cooling during process for aluminium profiles. A practical part describes experiments conducted on the rolling mill process under various conditions. The thesis work shows that the quality can be improved by rolling the slab in Aluminium industry by executing band tests and analysing graphs as 3-sigma, outward thickness and 3Dgraphs and its flatness.
Den här rapporten avser ett examensarbete som har utförts inom valsteknik. Examensarbetet genomfördes på Sapa Finspång Heat Transfer. Syftet med arbetet var att utvärdera tjockleksdata och planhetsdata, dvs. att ge högsta optimala startvärdet för valskraften för att komma fort i rätt tjocklek och ge bästa möjliga planhet. Tjockleken, startvalskraften, startkraft valsböjningen är de set up-värden som skickas ner till reglersystemet. Rapporten inleds med en teoridel som beskriver varm- och kallvalsning av aluminium och en praktisk del som bygger på olika valsningsförsök. Exsamensarbetet visar att det går att öka kvaliteten på valsämnet vid valsning inom aluminiumindustrin genom att utföra bandtester och analysera grafer som 3-sigma, utgående tjocklek samt 3D-grafer och dess planhet.
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Geddes, Eric John Muir. "Tandem cold rolling and robust multivariable control." Thesis, University of Leicester, 1998. http://hdl.handle.net/2381/30171.

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Tandem cold rolling presents difficult challenges to the control engineer: the mill is a nonlinear multivariable system, limited instrumentation is available to measure product quality, the deformation process is uncertain, there are significant material transport delays and practical mill operation is required over a wide range of speeds with a variety of rolled products, introducing significant variation in the mill dynamics. A robust multivariable control solution is sought in this thesis. A nonlinear simulation of an open-loop mill is developed and validated against published data. A methodology for designing H loop shaping controllers is presented. Controller development, based on a typical industrial structure, is undertaken for comparative purposes and both types of controller are evaluated at full mill speed in the face of a wide range of disturbances. A gain scheduling scheme, with rules for weight modification at the intermediate operating points, is designed for mill acceleration. Potential for improved product quality is seen with the H controller. Theoretical studies into H optimization problems are also undertaken. In particular, the well-known problem of pole-zero cancellation is addressed. A novel construction of weighting function in a mixed sensitivity design enables the cancellation phenomenon to be exploited and is shown to act as a mechanism for partial pole placement. It is also shown how pole-zero cancellation arises with H loop shaping for particular classes of plant. Further perceived shortcomings of the H loop shaping method, namely the relationship between shaped and nominal plant uncertainty and the mathematical intractability of the uncertainty model, are afforded consideration. Several structured uncertainty models are investigated and relationships uncovered between H loop shaping and -synthesis. A structured loop shaping design is motivated: a solution via - K iteration yields an interesting robust stability interpretation, while the design is shown to have attractive robust stability and robust performance potential.
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劉光磊 and Guanglei Liu. "Modelling of cold rolling textures in mild steel." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31237435.

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GOMES, ULISSES ROCHA. "COLD-ROLLING PROCESS OPTIMIZATION BY MEANS EXPERIMENT PLANNING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=10090@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Esta dissertação teve como objetivo desenvolver um modelo através da técnica de planejamento de experimentos aplicado ao processo de laminação a frio para fabricação de aços especiais utilizados no segmento de mercado de bebidas carbonatadas. O processo consiste na transformação através da redução da espessura de uma bobina de aço laminada a quente e depois decapada para remoção do óxido, em uma bobina com espessura final desejada pelo cliente. Este processo envolve variáveis controláveis e não controláveis, que interagem umas com as outras afetando a variável resposta que é a espessura final do produto. As questões fundamentais são entender como as variáveis controláveis afetam a variável resposta? Quais são as mais influentes? Existem interações entre estas variáveis? É possível elaborar um modelo adequado para o problema? A técnica do planejamento fatorial fracionado não só torna possível encontrar tais respostas para as questões levantadas, mas também, abre novas perspectivas de aplicação desta poderosa ferramenta nos processos de produção, onde é bastante comum encontrar situações semelhantes ao estudo proposto por este trabalho. A realização deste projeto compreendeu, uma descrição do problema, uma revisão bibliográfica com as etapas necessárias para execução de um planejamento de experimentos, escolha das variáveis controláveis que integraram o experimento, a execução do experimento, a análise dos resultados, uma abordagem dos Modelos Lineares Generalizados e validação do modelo através de ajuste dos parâmetros do processo conforme indicado através da análise dos resultados. A aplicação desta metodologia e a implementação das alterações propostas proporcionaram robustez ao processo de forma que mesmo quando ocorrem as perturbações das variáveis não controláveis, ainda assim a espessura permanece dentro das tolerâncias especificadas. Proporcionou ainda uma redução na variação de ± 1.5% para ± 1.0% , quando era de se esperar a necessidade de investimentos em tecnologia o que tornaria o produto mais caro e menos competitivo frente aos sucedâneos. Os resultados alcançados possibilitam a defesa de mercado através de uma maior competitividade obtida pelo menor custo dos produtos em aço.
This dissertation aims to develop a model by using experiment planning techniques applied to cold-rolling process to manufacture special steels utilized in the carbonated beverage market segment. The process consists of downgauging hot-rolled coil, which is further pickled for oxide removal, into a coil with the final thickness required by customer. It involves controlled and uncontrolled variables, which interact with one another, thus affecting the response variable, i..e, product´s final thickness. Some of the fundamental questions to be asked include: How do controlled variables affect response variable? What are the most influential ones? Are there interactions among such variables? Is it possible to work out an appropriate model to address this problem? The fragmented factor planning technique provides answers to the questions raised, by breaking new grounds in terms of using this powerful tool in manufacturing processes , where situations similar to those suggested by this study are fairly common. It includes a description of the problem, a bibliography review with the required steps to conduct the experiment planning, choice of controlled variables which make up the experiment as well as its execution, result analysis, an approach to Generalized Linear Models, and validation of model by adjusting process analysis as shown in the result analysis. Applying this methodology and implementing the proposed changes bolstered the process in such a way that even when disturbances of uncontrolled variables occur the thickness remains within the specified tolerances. Additionally, a further reduction in variation ranging from ± 1.5% to ± 1.0% was achieved, where technology investment would be required, thereby making steel products more expensive and less competitive against other competing products, thus ensuring competitiveness.
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Liu, Guanglei. "Modelling of cold rolling textures in mild steel /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19712790.

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El, Siblani Ali. "Tool condition analysis and monitoring in cold rolling process." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41318.

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This research is about a costly problem in the automotive industry due to tool fracture during the splines cold rolling of steel shafts. The objective is to study the cause of this failure and propose solutions that can be implemented in the workshop.The writing starts with a brief introduction of the companies involved in shafts production and problem solving. It introduces the cold rolling process and its advantages on splines manufacturing, and it goes through relevant material and process characteristics that help to determine the cause of tool fracture.In order to understand the process failure and production flow, it has been necessary to build up an Ishikawa diagram with possible tool fracture causes. After collecting and analysing the data about the machine tool, cold rolling process and work-piece and rolling tool materials, tests and experiments have been done.It has been considered that there is a rolling tool fatigue that causes tool fracture. Beside tool fracture, two more problems with production flow instability and the right side rolling tool have been detected. Testing the material hardness of the work-piece has shown continuous hardness fluctuations from the supplier. Rolling tool misalignment has been measured by using a vernier caliper measurement device. Rolling tools material hardness analysis shows that tool is very hard and it is possible to use a tougher material which responds better to cyclic loads.Leax has tried to solve the problem by testing another lubrication and tool coatings. A modal analysis test has been performed in order to find the natural frequency of the work-piece which possibly may lead to vibration and over loading one of the rolling tools.The conclusion that has been reached is that main cause of fracture is rolling tool fatigue due to cyclic loads and it is important to use other rolling tool material. The other two detected problems, production flow instability and rigth side rolling tool fracture, should be considered as a part of the problem in order to significantly increase tools life and stabilize production flow rate.
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Ramaprasad, Pradeep. "Finite element modeling and analysis of cold ring rolling." Thesis, Wichita State University, 2009. http://hdl.handle.net/10057/2422.

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Cold ring rolling is a complex metal forming process and generally not well understood. In many instances, considerable experience and experimentation is required to develop the process. During the process, plastic deformation behavior namely the plastic deformation state and its development in the deformation zone, has an important effect on the stability of the process. Hence, investigating the plastic deformation behavior in the deformation zone during the process is very significant for predicting the metal flow, controlling the quality of deformed rings and optimizing the process parameters. In this thesis, a study on plastic deformation behavior in cold ring rolling has been carried out through 2D numerical simulation using the LS-DYNA numerical finite element analysis code. The type of deformation behavior is compared with three type of plastic deformation behavior, established in previous studies. One type is that the material in the deformation zone entirely comes into the plastic deformation state at the early stage of the process (Type 1). A second type is that the material in the deformation zone gradually comes into the plastic deformation state during the process (Type 2). The last type is that at the end of process, there is still a rigid zone in elastic deformation or small plastic strain state near the middle radius of the ring blank (Type 3). The theoretical equations for decisive factor for plastic deformation behavior, which is the average amount of feed per revolution and functional relations between the average amount of feed per revolution and various process parameters, are ascertained with the assumption that the change in ring height during the process is negligible. Hence axial rolls are used to restrict the metal flow in axial direction of the ring. The simulation is performed for vi another class of aluminum alloy and the results are explored. The simulation is performed by varying the decisive factors and the results are plotted for the effective plastic strain, vonmises stress and KE/IE ratio v/s time. The distribution of plastic strain through the thickness of the ring is also studied. A study on effect of the plastic deformation behavior on driver roll force was then carried out for both the materials. Through this thesis it was showed that it is required to run the cold ring rolling process at lower driver roll speed and higher feed rate. It is also required to have higher average amount of feed per revolution to achieve homogeneous deformation, uniform strain distribution and higher driver roll force. The results of this thesis in which a 2D FE analysis with plane strain formulation theory is carried out, can be used as a basis for optimizing the process parameters.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
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MATTUCCI, LUCA MARIA. "Numerical study of cold rolling process with variable thickness." Doctoral thesis, Università Politecnica delle Marche, 2018. http://hdl.handle.net/11566/256367.

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Il principale obiettivo tecnologico di questo progetto di ricerca è lo sviluppo di una tecnologia di laminazione a freddo innovativa, tramite la distribuzione di aree di diverso spessore sul prodotto finito, in modo che il materiale possa essere distribuito al meglio dove è necessario, per soddisfare i requisiti di resistenza e/o rigidezza. Per quanto riguarda il processo di laminazione a freddo, l'obiettivo è quello di effettuare un upgrade della soluzione 1D, nota anche come profile- rolling, già presente in molte aree industriali: il processo di laminazione a zone denominato patch-rolling. Esso rappresenta un'innovazione assoluta consentendo di ottenere zone di maggiore spessore già in fase di laminazione a freddo, nel rispetto delle dimensioni richieste e del posizionamento risultante dalle mappe delle sollecitazioni. L'obiettivo è dunque quello di sviluppare uno strumento di supporto in grado non solo di indicare la fattibilità delle patch, come richiesto dal progetto, ma anche di suggerire eventuali modi che come la dimensione delle patch, variazione di spessore, raggio di raccordo ecc. La prima fase del progetto è stata la scelta del materiale dalle migliori prestazioni per i processi di laminazione e stampaggio. A tale scopo, diversi materiali sono stati caratterizzati mediante test mono-assiali e di formabilità. I primi hanno permesso di identificare le curve di flusso plastico e le principali caratteristiche meccaniche del materiale, mentre quelle di formabilità hanno permesso di valutare l'influenza dell'anisotropia e tracciare i diagrammi limite di formabilità grazie a metodi ottici avanzati. La fase successiva, quindi, è stata lo sviluppo di un modello agli elementi finiti del processo di laminazione a patch in cui venivano richieste solo le proprietà meccaniche del materiale. Dopo che il modello è stato con figurato e convalidato con successo, sono state studiate diverse configurazioni di patch con il modello FEM già descritto. A causa della deformazione non bilanciata nel senso della lunghezza del laminato, è stato sviluppato anche un modello analitico più semplice e veloce in MatLAB R per fornire un'anteprima della forma del laminato con il solo ne di valutare la qualità della distribuzione delle patch. Quindi, lo studio di come i principali fattori (variabili principali) coinvolti nel processo di laminazione influenzino la fattibilità del processo stesso, è stato eseguito attraverso una sperimentazione FEM organizzata secondo le tecniche del Design of Experiments (DoE). L'analisi dei risultati del DoE ha permesso di sviluppare e analizzare un'applicazione di casi reali, a partire dalla distribuzione delle patch no alla realizzazione del prototipo.
The main technological aim of this research project is the development of an innovative cold rolling technology with the distribution of different thickness areas on the finished product, so the material can be best distributed where it is needed, to satisfy strength and/or stiffness requirements. Regarding the cold rolling process, the aim is to achieve a better optimisation of the 1D solution, also known as profile-rolling, already seen in many industrial areas: the multi-thickness rolling process named patch-rolling. It represents an absolute innovation by allowing the higher thickness zones already used in the process of cold rolling to be obtained, with respect to the requested sizes and positioning resulting from the stress map. To this purpose the goal is to develop a support tool able not only to indicate the feasibility of the patches, as requested by the project, but also which suggests any amendments needed such as dimension of the patches, thickness variation, fillet radius etc. The first stage of the project was the choice of the material with best performances in both rolling and stamping processes. To this purpose, several possible challengers were deeply investigated through uni-axial and formability tests. First ones were led to identify the flow plastic curves and principal mechanical characteristics of the material while the formability ones allowed the anisotropy influence and the Forming Limit Diagrams to be evaluated thanks to advanced optical methods. The next stage, indeed, was the development of a finite element method model of the patch-rolling process in which only mechanical properties of the material were requested. After the model was successfully set-up and validated, several patch-configurations were investigated with the FEM model already described. Due to the unbalanced length-wise direction deformation of the work-piece a more simple and fast analytical model was also developed in MatLAB R to provide a pre-view of the shape of the laminated work-piece only to evaluate the quality of the patch distribution. Then the study of how the principal factors (main variables) involved in the rolling process may affect the feasibility of the process itself, was performed through a FEM experimentation organized according to the Design of Experiments (DoE) techniques. The analysis of the results of the DoE allowed a real case application to be developed and analysed, starting from the patch distribution until the prototype realisation.
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Kristoffersen, Steinar. "Improvement Fatigue Performance of Threaded Drillstring Connections by Cold Rolling." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-67.

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The research work presented in this thesis is concerned with analytical, numerical and experimental studies of the effect of cold rolling on the fatigue behaviour of threaded drillstring connections.

A comprehensive literature study is made of the various effects on the fatigue behaviour of residual stresses introduced by mechanical deformation of notched components. Some of the effects studied are cyclic hardening behaviour after prestraining, cyclic creep, fatigue initiation in prestrained materials, short cracks and crack growth models including crack closure.

Residual stresses were introduced in the surface of a smooth pipe by a rolling device to simulate a cold rolling process and verify the calculated residual stresses by measurements. Strain hardening and contact algorithm of the two bodies were incorporated in the FE analyses. Two significant errors were found in the commercial software package for residual stress evaluation, Restan v. 3.3.2a also called SINT, when using the Schajer method. The Schajer algorithm is the only hole-drilling algorithm without theoretical shortcomings, and is recommended when measuring large residual stress gradients in the depth directions. Using the Schajer method solved by in-house Matlab-routines good agreement between measured residual stress gradients and residual stress gradients from FE analyses was found.

Full scale fatigue tests were performed on pipes cut used drillstrings with notches of similar geometry as threads used in drillstring connections. The simulated threads consisted of four full depth helix notches with runouts at the surface. The pipe threads were cold rolled and fatigue tested in a full-scale four-point rotating bending fatigue testing rig. The test results showed that cold rolling had an effect on the crack initiating period. A major part of the fatigue life was with cracks observed at the notch root, but due to the increased fatigue crack propagation resistance the final fracture initiated at pits inside the pipe. Therefor, an optimisation of the roll geometry and rolling parameters was not possible. However, a significant fatigue life improvement was achieved. Based on experiments, a roller with similar profile as the thread root is recommended. A rolling force of maximum 20 KN is recommended to minimise the possibility of damaging the thread profile. Shallow cracks were observed typically when 5% of the fatigue life had expired. Re-rolling after 50% of expected improved fatigue life, when also short cracks were observed in the notch roots further increased the fatigue improvements.

Pretensioned small steel specimens with a notch were used to simulate cold rolled threats. The specimens were fatigue tested in tension with minimum load close to zero. Pretensioning increased the fatigue life form approximately 50 000 cycles to an infinite number of cycles. In these test non-propagating cracks of typically 0.4 mm length were found. The benefit from pretensioning gradually disappeared with increasing mean stress. FE analyses indicated that an almost instant relaxation of residual stresses to a level with no monotonic strain hardening from preloading would take place when cycled to moderate mean stress. Cycled at low mean stress, an instant relaxation of the surface layer was found in analysis. All observations from notched pretensioned fatigue specimens were in good agreement with the available literature. However, preloading was found to be strain rate dependent in tests where a pretension load held for 2 minutes gave a longer fatigue life than a sinusoidal loading-unloading cycle performed over a one minute interval.

Strain hardening was found not contributing to the fatigue life improvement, whereas the polishing effect from improved surface quality after cold rolling increased the fatigue initiation period. However, residual stress and subsequent early crack closure was the dominating effect at moderate cyclic mean loads.

The material data required to perform FE fatigue simulation studies of a full threaded cold rolled coupling incorporating make-up torque, include cyclic stress strain behaviour at various amplitudes and mean stress caused by various degrees of prestraining. Such data are not readily available today, and are only possible to obtain in carefully planned and executed experiments. Also, 3D FE model required for cold rolling analysis is extremely CPU time consuming. Consequently, cold rolling simulations could not be successfully implemented in this work.

One of the main conclusions from this work is that drillstring connections will respond differently to thread rolling at the pin or box. A significant improvement in the fatigue life of box threads from residual stresses is expected mainly from increased resistance to crack propagation. However, the compressive residual stress is sensitive to overloading in compression, and the improvement from residual stress depends strongly on the mean stress (or R-ratio). At values of R of approximately 0.6 or higher the beneficial of rolling therefore tends to disappear. At the critical locations of the pin, which are the last engaged thread or the stress relief groove, the effect of residual stresses introduced by rolling is therefore likely to be severely reduced by the high mean stress imposed during make-up of the connection. However, a beneficial effect of rolling is expected to remain due to improved surface condition and due to a possible effect of strain hardening. The net results of these factors on the fatigue performance of actual drillstrings can only be determined in full scale rotating bending tests.

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Baudet, Alvaro. "Optimize cold sector material flow of a steel rolling mill." Thesis, KTH, Industriell produktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50380.

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The steel production is a highly capital and energy intensive industry that due to recent raw materials’ price increase and lowered demand, it has been squeezed and forced to look more deeply on how to add value to the customer at lower operative costs. The project was carried out on site at the ArcelorMittal’s millin Esch-Belval, Luxembourg which comprises an integrated melt shop, continuous casting plant and the rolling mill with the objectives of proposing optimization rules for the cold sector of the rolling mill and to analyze the impact of the future truckbay shipment area. The course of action followed was to draw a Value Stream Map (VSM) in order to understand the plants’ current status and serve as a roadmap to build a discrete event simulation model that after its validation, served as a support tool to analyze what-if scenarios. Similarly, a current status analysis of the  shipment/stock area was conducted collecting statistics about potential truckshipments and finally proposing a series of recommendations for its operation. The main proposed solutions to optimize the rolling mill’s cold sector were:(a) Integer programming model to globally optimize the scrap level when cutting the mother beams to customer size beams. (b) Updating pacemaker parameters and (c) Local process time improvements. Concerning the future truck loading, the simulation model was used as a support tool to dimension the transition area between the cranes’ and forklift operations resulting in a 6-9 bundles buffer capacity. Additionally, the current length-based storage policy was found to have competitive objectives so a turnover class-based storage policy is proposed with A, B, C classes which should provide an improved organization of the stock and travel distance of the cranes. The evaluation of the cranes’ performance remains an issue since there are currently no objective measures like, for instance, travelled distance. Optical measuring devices are suggested as one option to have a performance indicator that would help further investigate root cause problems in the shipping/stock area.
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Books on the topic "Cold Rolling"

1

Pittner, John, and Marwan A. Simaan. Tandem Cold Metal Rolling Mill Control. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-067-0.

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Song, Jianli, Zhiqi Liu, and Yongtang Li. Cold Rolling Precision Forming of Shaft Parts. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0.

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Cold-pressing technology. Amsterdam: Elsevier, 1990.

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Pittner, John. Tandem cold metal rolling mill control: Using practical advanced methods. London: Springer, 2011.

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Institute of Metals. Metals Technology Committee., Institute of Metals. Engineering Committee., and Institute of Measurement and Control., eds. Advances in cold rolling technology: Proceedings of the international conference. London: Institute of Metals, 1985.

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Brassard, Jason. Deformation mechanisms during creep and cold rolling of nanocrystalline nickel. Ottawa: National Library of Canada, 2003.

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Veryard, Mark R. An investigation into strip tension control on a cold rolling mill. Manchester: UMIST, 1997.

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Information, Metals. Cold rolling...: Citations from the METADEX database January 1983 - February 1986.... London: Metals Information, 1986.

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Tsuzaki, Takumi. Prediction of edge cracking in cold rolling using the finite-element method. Birmingham: University of Birmingham, 1993.

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Verderevskiĭ, V. A. Rolikovye stany kholodnoĭ prokatki trub. Moskva: "Metallurgii͡a︡", 1992.

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Book chapters on the topic "Cold Rolling"

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Huot, Jacques. "Cold Rolling." In SpringerBriefs in Applied Sciences and Technology, 27–38. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-35107-0_6.

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Dianhua, Zhang, and Xu Kuangdi. "Strip Cold Rolling." In The ECPH Encyclopedia of Mining and Metallurgy, 1–4. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0740-1_341-1.

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Azushima, Akira. "Tribology in Cold Sheet Rolling." In Tribology in Sheet Rolling Technology, 123–254. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-17226-2_4.

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Kajiwara, Toshiyuki, Hidetoshi Nishi, Yasutsugu Yoshimura, and Hideaki Furumoto. "6-High Type Rolling Mill for Cold Rolling." In 60 Excellent Inventions in Metal Forming, 239–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46312-3_37.

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Karhausen, Kai F., and Oliver Seiferth. "Aluminium Hot and Cold Rolling." In Encyclopedia of Lubricants and Lubrication, 27–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_304.

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Song, Jianli, Zhiqi Liu, and Yongtang Li. "Cold Rolling Precision Forming Equipments." In Cold Rolling Precision Forming of Shaft Parts, 227–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54048-0_10.

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Yu, Xianglong, and Ji Zhou. "Cold Rolling of TWIP Steels." In Rolling of Advanced High Strength Steels, 415–49. Boca Raton, FL : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120577-10.

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Purkait, Mihir Kumar, Piyal Mondal, Pranjal Pratim Das, and Deepti. "Treatment of Cold Rolling Wastewater." In Wastewater Treatment in Steel Industries, 100–113. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003366263-8.

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Nili-Ahmadabadi, Màhmoud, Hamidreza Koohdar, and Mohammad Habibi-Parsa. "Cold Rolling Practice of Martensitic Steel." In Rolling of Advanced High Strength Steels, 450–81. Boca Raton, FL : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120577-11.

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Sieber, Heino, Gerhard Wilde, Alexander Sagel, and John H. Perepezko. "Solid State Amorphization by Cold-Rolling." In Materials Development and Processing - Bulk Amorphous Materials, Undercooling and Powder Metallurgy, 1–9. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607277.ch1.

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Conference papers on the topic "Cold Rolling"

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Qi, GuangXue, and Zesheng Deng. "Width measurement of cold-rolling strip." In Wuhan 91, edited by Brian Culshaw and Yanbiao Liao. SPIE, 1991. http://dx.doi.org/10.1117/12.49985.

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Tsuzuki, T., and T. Kikkawa. "Zoom-Mill for Reversible Cold Rolling." In AISTech2019. AIST, 2019. http://dx.doi.org/10.33313/377/169.

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Bytomski, Georg, Gerlinde Djumlija, and Olivier Germain. "TECHNOLOGY PACKAGE FOR COLD ROLLING MILLS." In 45º Seminário de Laminação, Processos e Produtos Laminados e Revestidos. São Paulo: Editora Blucher, 2008. http://dx.doi.org/10.5151/2594-5297-0046.

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Yamamoto, A. "Cold Rolling Mill Technologies for Electrical Steel." In AISTech 2021. AIST, 2021. http://dx.doi.org/10.33313/382/171-41214-114.

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Yamamoto, A. "Cold Rolling Mill Technologies for Electrical Steel." In AISTech 2021. AIST, 2021. http://dx.doi.org/10.33313/382/071.

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Peretic, M., M. Richard, and S. Krüger. "Chatter Management at Cold Rolling Mills Today." In AISTech2019. AIST, 2019. http://dx.doi.org/10.33313/377/173.

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Yamamoto, A. "Cold Rolling Mill Technologies for Electrical Steel." In AISTech 2020. AIST, 2020. http://dx.doi.org/10.33313/380/127.

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Hubert, C., L. Dubar, M. Dubar, A. Dubois, Francisco Chinesta, Yvan Chastel, and Mohamed El Mansori. "Strip edge cracking simulation in cold rolling." In INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES (AMPT2010). AIP, 2011. http://dx.doi.org/10.1063/1.3552504.

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Gill, A., N. Gill, and N. Singh. "Discrete Techniques of Cold Rolling Ultrathin Strip." In AISTech 2024. AIST, 2024. http://dx.doi.org/10.33313/388/134.

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Wendel, John C., Andrew W. Nelson, Arif S. Malik, and Mark E. Zipf. "Bayesian-Based Probabilistic Force Modeling in Cold Rolling." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1226.

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A primary factor in manufacturing high-quality cold-rolled sheet is the ability to accurately predict the required rolling force. The rolling force directly influences roll-stack deflections, which correlate to the resulting flatness quality of the rolled sheet. Increasingly high demand for thin and ultra-thin gauge for cold-rolled sheet metals, along with the correspondingly larger sensitivity of flatness defects when rolling thin gauges, makes it more important to accurately and rapidly predict the rolling force before the rolling operation begins. Accurate rolling force predictions enable assignment of appropriate pass schedules and flatness mechanism set-points early in the rolling process, thereby reducing rolling time, improving quality, and reducing scrap. Traditionally, force predictions in cold rolling have employed two-dimensional analytical models such as those proposed by Roberts and by Bland & Ford. These simplified methods are prone to inaccuracy, however, because of several uncertain, yet influential, model parameters that are difficult to establish deterministically for wide-ranging products. These parameters include, for example, the average compressive yield strength of the rolled strip, frictional characteristics relating to low and high mill speeds, and the strain rate dependency of yield strength. Conventionally, these unknown parameters have been evaluated deterministically by comparing force predictions with actual rolling force data and using a best-fit regression approach. In this work, Bayesian updating using a probability mass function (PMF) is applied to identify joint posterior probability distributions of the uncertain parameters in rolling force models. It is shown that the non-deterministic Bayesian updating approach is particularly useful as new evidence becomes available in the form of additional rolling force data. The aim of the work is to incorporate Bayesian inference into rolling force prediction for cold rolling mills to create a probabilistic modeling approach which can also “learn” as new production data is added. The goal is a model that can better predict necessary mill parameters based on accurate probability estimates of the actual rolling force. The rolling force data used in this work for applying Bayesian updating is actual production data of grades 301 and 304L (low carbon) stainless steels, rolled on a 10-inch wide 4-high cold rolling mill. This force data was collected by observing and averaging load cell measurements at steady rolling speeds.
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Reports on the topic "Cold Rolling"

1

Hansen, N., D. J. Jensen, and D. A. Hughes. Textural and microstructural evolution during cold-rolling of pure nickel. Office of Scientific and Technical Information (OSTI), January 1994. http://dx.doi.org/10.2172/10117712.

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Choi, Kyoo Sil, Chao Wang, William E. Frazier, Curt A. Lavender, and Vineet V. Joshi. Carbide Particle Redistribution in U-10Mo Alloy during Hot and Cold Rolling Processes. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1633411.

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Raftery, Adrian E., Miroslav Karny, Josef Andrysek, and Pavel Ettler. Online Prediction under Model Uncertainty Via Dynamic Model Averaging: Application to a Cold Rolling Mill. Fort Belvoir, VA: Defense Technical Information Center, December 2007. http://dx.doi.org/10.21236/ada478617.

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Herr, Donald F. Rolling Thunder: Could Theory Have Helped. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada441825.

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Wang, Yong-Yi, Zhili Feng, Wentao Cheng, and Sudarsanam Suresh Babu. L51939 Weldability of High-Strength Enhanced Hardenability Steels. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 2003. http://dx.doi.org/10.55274/r0010384.

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Since the 1970s, the development of high-strength pipeline steels has followed the route of progressively reduced harden ability through lower carbon and alloying element contents. Micro-alloying, controlled rolling (CR), and thermo-mechanical controlled processing (TMCP) have been used extensively to achieve the high-strength and other material property requirements despite the trend towards lower carbon content. The primary driving force behind the evolution of these alloying and processing strategies stems from the concerns over the weld ability, particularly the hydrogen induced cracking (HIC), at ever-increasing strength levels. Accompanying the extensive reliance on micro-alloying, CR, and TMCP, there has been a movement to tighter restrictions on micro-alloy variability, the increased use of heavy reduction at low inter-critical temperatures and, in some instances, the reliance on cold expansion. The objective of this project was to evaluate alternate steels with enhanced harden ability and identify those that would have a potential to (1) meet the high strength/high toughness requirement but without the adverse effects of the early trial heats of micro-alloyed TMCP X80 and X100 line pipe steels, and (2) exhibit sufficient resistance to hydrogen induced cracking (HIC) when welded with processes and consumables representative of state-of-the-art, low-hydrogen field girth welding practices. The focus of the project was on the weld ability and properties of the base metal and the heat-affected zone (HAZ). The selection and development of suitable weld consumables were not part of this project.
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McCulloch, Bob. INDOT Research Program Benefit Cost Analysis—Return on Investment for Projects Completed in FY 2020. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317265.

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To demonstrate the value of research and its implementation, the Governor’s Office requested an annual financial analysis of the INDOT Research Program to determine the return on the research investment (ROI). The current financial analysis is for research projects that completed in FY 2020. Analyses on previous year’s projects is necessary primarily due to the time it takes some project outcomes to be implemented, extending into the following year. Therefore, the FY 2020 analysis is completed in calendar 2021. The ROI analysis will supplement the annual IMPACT report by adding a more rigorous quantitative benefit cost analysis (BCA) to the Research Program. Previous financial analyses used the approach of calculating net present values of cash flows to determine a benefit cost ratio and this report uses the same approach. Additionally, an overall program rate of return (ROI) is reported and will be accumulated over time into a rolling 5-year average. While the quantitative benefit cost analysis (BCA) was rigorous, results are limited to projects where benefits and costs could be quantified, where data is available to perform a quantitative analysis. Qualitative benefits are highlighted in the companion annual IMPACT report (https://www.in.gov/indot/files/Research-Program-Impact-Report.pdf ). In 2018, INDOT unveiled its new Strategic Plan. The Strategic Plan guides the priority research needs of the Research Program and in turn the research results support accomplishing the INDOT Strategic Plan, Strategic Objectives. A new Strategic Objective has been added to the INDOT Strategic Plan addressing Innovation & Technology. Additionally, INDOT created a new Office of Innovation. While the Research Program supports all of INDOT’s Strategic Objectives, these new initiatives have further highlighted the importance of research and its role in achieving the Strategic Objectives outlined in the new INDOT Strategic Plan. There has been more emphasis of new research needs related to new technology changes and transformational technologies. This will help position INDOT for future growth, adoption of new technologies and partnering opportunities. These new research projects will provide large qualitative ROI, however are difficult to quantify due to their complexity and newness.
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County road division worker crushed between asphalt truck and shadow truck during rolling cold patch operation. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, June 2019. http://dx.doi.org/10.26616/nioshsface17mi012.

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EFFECT OF RANDOM PRE-STRESSED FRICTION LOSS ON THE PERFORMANCE OF A SUSPEN-DOME STRUCTURE. The Hong Kong Institute of Steel Construction, March 2022. http://dx.doi.org/10.18057/ijasc.2022.18.1.5.

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The key to the high-efficiency performance of the suspen-dome structure is to apply the pre-stressed design value to the structure accurately. However, engineering practice has found that the use of tensioning hoop cables to apply the pre-stress will produce noticeable pre-stressed friction loss (PFL), which significantly affects the safety performance of the structure. In this paper, based on a 1:10 scaled-down experiment model of a suspen-dome structure with rolling cable-strut joint installed, the random PFL (RPFL) effect of the suspen-dome on structure performance was analyzed through a probability statistics theory. First, aiming at the unequal tensioning force at both sides of the tensioned hoop cable during the tensioning process, a pre-stressed force calculation method is proposed that considers the unequal tensioning control force and RPFL at all cable–strut joints, and the reliability of this method is verified through a tension test. Then, based on the cable-joint tension test carried out in the early stage of the research group, a random mathematical model of the friction coefficient (FC) at the rolling cable–strut joint is established. And then, the cable force calculation method is used to establish the random finite element model, and independent and random changes in the FC at each rolling cable–strut joint can be considered. Subsequently, the Monte Carlo method is used to calculate the random mathematical characteristics of the mechanical performance parameters such as the member stress and joint deformation, and the obtained results are verified through a static loading experiment. In addition, to investigate the effect of random defects on structural stability, other random defects, such as the initial curvature and installation deviation, were continuously introduce based on the random finite element model. As such, we could obtain the law of the effect of multi-defect random variation coupling on the structure’s ultimate bearing capacity.
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