Bibliographies thématiques / V-BENDING

Littérature scientifique sur le sujet « V-BENDING »

Auteur : Grafiati

Publié le 16 janvier 2024

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Articles de revues sur le sujet "V-BENDING"

Doungmarda, Kongkiet, et Sutasn Thipprakmas. « A New Bending Force Formula for the V-Die Bending Process ». Metals 13, n^o 3 (13 mars 2023) : 587. http://dx.doi.org/10.3390/met13030587.

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The V-die bending force is an important parameter in respect of press machine capacity selection, but it has not been the focus of previous research. Furthermore, while the various modified formulas proposed in previous research were calculated using V-die bending theory, they are insufficient for predicting the actual V-die bending force. Based on the actual V-die bending mechanism, a new V-die bending force formula is proposed in this study, in which bending is generated not only in the bending allowance zone but also on the legs next to the bending allowance zone. Therefore, the bending force in these zones must be carefully considered. The finite element method (FEM) was used as an effective technique to clearly determine the actual V-die bending mechanism and to modify and develop a new V-die bending force formula. Laboratory experiments were carried out to validate the FEM simulation results as well as to confirm the accuracy of the proposed new V-die bending force formula. Two types of workpiece material, aluminum AA1100-O (JIS) and medium carbon-steel sheet-grade SPCC (JIS), were used as test materials. The results clearly show that the new V-die bending force formula offers more accuracy in V-die bending force prediction than predictions based on past formulas. The error in the V-die bending forces predicted using the new formula was approximately 5% compared with those of the experimental works.

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Rian Kurniadi, Muhammad, Jatira Jatira, Khoirudin, Rizki Aulia Nanda, Rama Kurniawan, Otong Jaelani et Dibyo Setiawan. « Preliminary Study of the Spring-back/Spring-go Phenomenon in the V-Bending Process Using SGCC Steel Thin Material ». Jurnal Teknik Mesin Mechanical Xplore 3, n^o 2 (30 décembre 2022) : 78–86. http://dx.doi.org/10.36805/jtmmx.v3i2.3370.

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This research analyses v-bending results using galvanized SGCC (JIS G 3302) sheet steel. The accuracy of the angle and dimensions of the bending results are the significant elements of the bending process that must be achieved. The bending spring-back/spring-go phenomenon has an impact on bending angle accuracy. If proper parameters are chosen, the spring-tub/spring-go angle should be minimized. This study aimed to see how the proposed v-bending process affected the spring-tub/spring-go angle value. An experimental approach was selected in this study. V-die bending opening, V-die punch angle, V-die punch speed, and bending force are all input parameters for the v-bending process. Meanwhile, in this study, galvanized steel with a thickness of 1.2 mm was used. The results of the ANOVA evaluation showed that the v-die punch speed and bending force are two parameters that affect the response of the variable, with a percentage contribution of 31.0% each. The minimum spring-back angle was found in the second sample, while the minimum spring-go angle was found in the fourth sample

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OGAWA, Hideo, Kento SHIGEISHI et Junichi KOYAMA. « Sheet Metal V-bending Without Springback ». Journal of the Japan Society for Technology of Plasticity 47, n^o 541 (2006) : 144–48. http://dx.doi.org/10.9773/sosei.47.144.

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Kiswanto, Gandjar, Aida Mahmudah et Dedi Priadi. « Preliminary Investigation of Micro-V-Bending ». MATEC Web of Conferences 108 (2017) : 06001. http://dx.doi.org/10.1051/matecconf/201710806001.

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Zhao, Jun, Chun Jian Su et Ying Ping Guan. « Intelligent Control Experiment Study for V-Shape Free Bending of Wide Sheet Metal ». Materials Science Forum 575-578 (avril 2008) : 186–91. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.186.

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The main problem in bending process of sheet metal is that it is difficult to control bending springback accurately. Springback produced from the unloading of bending makes the shape and size incongruent between bending workpiece and working portion of die. Because the final shape of bending workpiece is related with the whole deformation process, the geometric parameter of die, material performance parameter will have great effect on springback. Therefore, the springback problem is very complicated and the prediction and control of springback is the key to improve the accuracy of bending workpiece. Taking the V free bending of wide sheet as an object of study, the neural networks technology and data acquisition system based on LabVIEW are used to establish intelligent control experiment system for V free bending of wide sheet metal. The control accuracy of system is high and it provides the basis for the realization of intelligent control for V-shape free bending of wide sheet metal in practice in future.

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SUYUTI, MUHAMMAD ARSYAD. « RANCANG BANGUN PRESS TOOL UNTUK ALAT BENDING PELAT TIPE DIE-V AIR BENDING ». Machine : Jurnal Teknik Mesin 6, n^o 1 (1 avril 2020) : 39–44. http://dx.doi.org/10.33019/jm.v6i1.1396.

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Pekerjaan pembentukan logam (metal forming) pada industri permesinan maupun pabrikasi las saat ini sangat banyak permintaan khususnya pada pekerjaan yang memerlukan proses bending. Proses bending merupakan pembentukan logam yang umumnya menggunakan lembaran pelat atau batang, baik dari bahan logam ferro maupun logam non ferro dengan cara ditekuk, yang mana dalam proses pembengkokan akan menyebabkan terjadinya pemuluran atau peregangan pada sumbu bidang netral sepanjang daerah bendingan dan menghasilkan garis bending yang lurus. Penggunaan teknologi tepat guna telah banyak digunakan untuk meningkatkan produktivitas, efisiensi, dan efektivitas dalam proses produksi pada industri permesinan maupun pabrikasi las berskala kecil dan menengah. Salah satu teknologi tepat guna yang memungkinkan diterapkan dalam proses produksi khususnya pekerjaan bending pelat yaitu mesin atau alat press bearing dengan cara menambahkan dengan press tool yang dilengkapi punch dan die penekuk. Press tool adalah salah satu jenis alat bantu pembentukan, pemotongan dan penekukan produk dari bahan dasar lembaran pelat yang operasinya menggunakan mesin press. Dari penelitian telah diciptakan press tool yang dilengkapi punch penekuk dan die berbentuk V air bending. Adapun spesifikasi press tool ini yaitu: sudut punch sama dengan 85o, radius punch sama dengan 1.5 mm, panjang punch sama dengan 300 mm, sudut die sama dengan 85o, lebar bukaan die sama dengan 33 mm, jarak langkah sama dengan 19 mm.

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Martynov, V. K. « Bending torsion in the V-belt drives ». Izvestiya MGTU MAMI 9, n^o 1-1 (10 janvier 2015) : 65–71. http://dx.doi.org/10.17816/2074-0530-67226.

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The paper deals with the possible appearance of bending torsion of belt in of belt transmissions, especially for wide variable with corrugations. For similar V-belts loading in transmission - as flexible rods of open profile - imposes its own specificity in considering of new torque to the defined in the existing theory based on the hypothesis of plane sections. Results increase opportunities for description of the processes in transmission, giving them proper assessment.

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Sergejus, Borodinas, Piotr Vasiljev et Jonas Stankevichius. « V-mode Piezomotor Using Flexural Bending Mode ». Journal of the Korean Physical Society 57, n^o 4(1) (15 octobre 2010) : 955–58. http://dx.doi.org/10.3938/jkps.57.955.

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Koumura, Yuki, et Zhigang Wang. « Formulation of Forming Load in V-Bending ». MATEC Web of Conferences 45 (2016) : 01004. http://dx.doi.org/10.1051/matecconf/20164501004.

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Sun, Zhen Zhong, Wei Feng He, Hai Bin Chen, Sheng Gui Chen et Rong Yong Li. « Study on V-Bending of Aluminium Foam Sandwich Panels ». Advanced Materials Research 181-182 (janvier 2011) : 281–86. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.281.

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The forming of the completed aluminium foam sandwich (AFS) panels would determine an improvement in the manufacturing of parts and panels. In this paper the authors have investigated the formability of AFS through experiments. the load versus punch stroke curve and deformation procedures of Aluminium foam sandwiche panels was investigated by performing V-bending experiments. A serious problem encountered in the V-bending was bending-induced large transverse shear deformation of the skin-core layer. It causes the delamination of the AFS. It was found from experimental observations that the large shear defomation progresses rapidly only at the final stage of V-bending. Consequently, the air-bending operation for Aluminium foam sandwiche panels is recommended for suppressing the shear deformation of skin-core layer to within an acceptable limit.

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Thèses sur le sujet "V-BENDING"

Sarikaya, Onur Turgay. « Analysis Of Heat Treatment Effect On Springback In V-bending ». Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610182/index.pdf.

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Aluminum based alloys have wide area of usage in automotive and defense industry and bending processes are frequently applied during production. One of the most important design criteria of bending processes is springback, which can be basically defined as elastic recovery of the part during unloading. To overcome this problem, heat treatment is generally applied to the workpiece material to refine tensile properties. In this study, the effect of heat treatment on springback characteristics of aluminum studied both numerically by using finite element analysis and experimentally. For this purpose, two different materials are selected and various heat treatment procedures are considered. The aluminum sheets having thickness of 1.6 mm, 2 mm and 2.5 mm are bent to 60&
#730
, 90&
#730
and 120&
#730
. The von Mises stress distributions, plastic strain values and punch load values and comparison of the numerical and experimental results are also given.

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Loth, Sebastian. « Atomic scale images of acceptors in III-V semiconductors band bending, tunneling paths and wave functions / ». Göttingen : Univ.-Verl. Göttingen, 2008. http://d-nb.info/989995232/34.

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Loth, Sebastian [Verfasser]. « Atomic scale images of acceptors in III-V semiconductors : band bending, tunneling paths and wave functions / Sebastian Loth ». Göttingen : Univ.-Verl. Göttingen, 2008. http://d-nb.info/989995232/34.

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Wasserbauer, Jaromír. « Lokální zkoušky mechanických vlastností materiálů ». Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216510.

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This thesis deals with measurement of hardness and microhardness in relation to structure of homogeneous and heterogeneous materials. In the introduction basic theoretical background is commented, i.e. definitions, terminology, principles of measuring techniques for estimation of hardness, microhardness, tensile strength, compressive strength and bending strength. Follows a brief review of present research results focused on use of described principles in materials engineering. Then the experimental equipment and sample preparation is described. The crucial part of the thesis is summary of achieved results of original measurement and discussion of their relations to each other. Finally, the groundbreaking estimation is described, showing the correlation of chemical composition gradient and mechanical properties in interfacial zone of geopolymeric material.

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Myšičková, Lucie. « Vývoj a zkoušení vysokohodnotných betonů pro subtilní konstrukce ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226971.

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Thesis describes properties of HPC compared to concretes of normal and high strength. It further describes the input materials and the procedure for designing the composition of the mixture. It gives examples of already completed structures made of HPC. The experimental part describes the optimization of concrete mix and production of specimens. In the end results of testing the properties of the developed mixes from tests of dynamic and static modulus of elasticity, compressive strength and tensile strength by bending are described.

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Gottwaldová, Aneta. « Studium vlastností cementových kompozitů s rozptýlenou výztuží z anorganických vláken ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392335.

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Diploma thesis deals with study of properties of cementious composites with fiber reinforcement from glass and basalt inorganic fibers. Diploma thesis includes a theoretical and experimental part. The theoretical part deals with information about glass and basalt fibers, their durability and usage. In the experimental part we monitored properfies of cement composites with basalt and glass fibers. Fibers were exposed to an aggressive environment. The properties of composites with reference fibers were compared with composites with fibers affacted by the aggressive environment. The properties of composites were examined after 28 and 90 days. We monitored compresive strenght, bending tensile strenght, tensile strenght, surface layer strenght and SEM.

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Fójcik, Tomáš. « Vliv triaxiální deformace kameniva na vlastnosti betonu ». Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216555.

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This diploma work takes focus in elastic modulus of unbound granular aggregates, which was determined by repeat load triaxial test and in deformation behaviour of unbound granular aggregates - elastic and plastic deformation. It was examine the propriety of this aggregate for its service as underlying granular material in pavement. Further, there was observed the influence of elastic modulus of unbound granular aggregates on concrete characteristics - compressive and bending strength. Finally, it was observed the influence of individual fractions of aggregates on its elastic modulus and strength of concrete.

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Vrtal, Roman. « Diagnostika poruch a vad podlah v bytové a občanské výstavbě ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227022.

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The object of the thesis is a description of preparation process, realization and subsequent treatment of floors based on calcium sulphate, including problems related to the issue. The aim of the work is to closely acquaint the reader with methods used in diagnostics of flooring failures and defects in the housing and civic construction, including practical applications of these methods on real structures. The work also includes experimental analysis of a real floor construction during local load effect.

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Šafář, Martin. « Vliv povlakování na lomové chování ledeburitické oceli ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229293.

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This work deals with tool steel Vanadis 6. It describes the preparation of samples for the three-point bending test, with which it examines the influence of surface roughness, the effect of nitriding, coating and duplex coatings on fracture behaviour of the steel. First, it examines bending strength and the total energy required to work of fracture. The work also includes mapping and measurement of surface roughness on different layers. This measurement is performed on a confocal microscope.

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Dvořák, Richard. « Studium efektu aplikace celulózových vláken v cementových kompozitech ». Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240420.

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This diploma thesis is focused on composition and processing of cellulose fibers and their usage in cementitious composites. It describes key attributes of cellulose fibers, which has to be acquired for effective use in cement composites. There are stated effects of cellulose fibers on concrete properties, such as workability, physical and mechanic attributes and freeze-thaw resistance. In experimental part is designed a mixture with portion of cellulose fibers. There has been performed various tests to define the effect of cellulose fibers. There was designed experiment to determine its alkali resistance for fibers itself, and possible changes in microstructure of fibers were analyzed by optic and electron scanning microscope.

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Livres sur le sujet "V-BENDING"

Ginger, Ray. The bending cross : A biography of Eugene Victor Debs. Kirksville, Mo : Thomas Jefferson University Press, 1992.

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Ginger, Ray. The bending cross : A biography of Eugene Victor Debs. Chicago, IL : Haymarket Books, 2007.

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Bending Bodies : v. 2 : Bending Bodies. Routledge, 2017. http://dx.doi.org/10.4324/9781315193960.

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Ginger, Ray. The Bending Cross : A Biography of Eugene Victor Debs. Haymarket Books, 2007.

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Chapitres de livres sur le sujet "V-BENDING"

Jia, Yueqiao, et Jeffrey Choong Luin Chiang. « Finite Element Analysis of Punching Shear of Reinforced Concrete Mushroom Slab-Column Connections Using ABAQUS ». Dans Advances in Frontier Research on Engineering Structures, 83–91. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_8.

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AbstractCapital is one of the common measures to strengthen the slab-column connections. It can make the joint's load capacity increase. However, when the connection is subjected to the unbalanced bending moment, the reduction effect of the capital on the bending moment is to be studied. Nonlinear finite element analysis is performed on reinforced concrete slabs with column capital for various moment-to-shear (M/V) ratios. The effect of capital radius on the punching shear resistance of slab-column connections is investigated. The 3D finite element modeling is performed using the concrete damage plasticity model and concrete constitutive equations. The concrete damage plasticity model parameters are calibrated by the experiment results of specimens. Increasing the radius of capital can improve the bearing capacity of nodes and reduce the moment transfer effect obviously.

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Jain, M. K., M. Marzouk et S. Shankar. « Microstructure-Bendability Relationship in V-Bending of Cast Aluminum Alloy A356 ». Dans PRICM, 3379–85. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118792148.ch418.

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Jain, M. K., M. Marzouk et S. Shankar. « Microstructure-Bendability Relationship in V-Bending of Cast Aluminum Alloy A356 ». Dans Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 3379–85. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48764-9_418.

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Hai, Vuong Gia, Hoang Van Quy, Nguyen Thi Hong Minh et Nguyen Duc Toan. « Study on Predict Spring-Back in V-Bending of SS400 Steel Plate and Select Bending Parameters by Finite Element Method ». Dans Lecture Notes in Mechanical Engineering, 135–44. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-31824-5_17.

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Hai, Vuong Gia, Nguyen Thi Hong Minh, Hoang Van Quy et Nguyen Duc Toan. « Optimization of Predicting Spring-Back When V-Bending for SS400 Steel Plate ». Dans Proceedings of the 2nd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2020), 118–25. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69610-8_16.

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Yakuno, Ryunosuke, Hiroki Suwa, Kazuhito Takahashi, Shohei Kajikawa, Yasunori Yusa et Takashi Kuboki. « Stress Relief for Crack Prevention by Adding Holes to V-Bending Die ». Dans Lecture Notes in Mechanical Engineering, 348–58. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-42093-1_34.

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Bordry, F., L. Bottura, A. Milanese, D. Tommasini, E. Jensen, Ph Lebrun, L. Tavian et al. « Accelerator Engineering and Technology : Accelerator Technology ». Dans Particle Physics Reference Library, 337–517. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34245-6_8.

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AbstractMagnets are at the core of both circular and linear accelerators. The main function of a magnet is to guide the charged particle beam by virtue of the Lorentz force, given by the following expression:where q is the electrical charge of the particle, v its velocity, and B the magnetic field induction. The trajectory of a particle in the field depends hence on the particle velocity and on the space distribution of the field. The simplest case is that of a uniform magnetic field with a single component and velocity v normal to it, in which case the particle trajectory is a circle. A uniform field has thus a pure bending effect on a charged particle, and the magnet that generates it is generally referred to as a dipole.

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Abe, Shinya, et Susumu Takahashi. « Influence of Forming Conditions to Springback in V-Bending Process Using Servo Press ». Dans ICAA13 : 13th International Conference on Aluminum Alloys, 705–10. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch103.

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Abe, Shinya, et Susumu Takahashi. « Influence of Forming Conditions on Springback in V-bending Process Using Servo Press ». Dans ICAA13 Pittsburgh, 705–10. Cham : Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_103.

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Hayakawa, Kunio, Yukio Sanomura, Mamoru Mizuno, Yukio Kasuga et Tamotsu Nakamura. « Finite Element Analysis of V-Bending of Polypropylene Using Hydrostatic-Pressure Dependent Plastic Constitutive Equation ». Dans Engineering Plasticity and Its Applications, 1103–8. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-433-2.1103.

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Actes de conférences sur le sujet "V-BENDING"

de Aguiar, João Batista. « V-BENDING MODEL APPLIED TO A ALUMINIUM STRIP ». Dans COBEF 2019. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobef2019.cof2019-0407.

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GÖRTAN, M. O. « Heat assisted V-bending characteristics of high strength S700MC steel ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-82.

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Abstract. Increasingly stringent regulations force automotive manufacturers to reduce their product weights without compromising passenger safety. To overcome this problem, high strength steels are used that enable a higher payload capacity whilst reducing the plate thickness and overall weight. However, high strength steels are generally associated with lower formability and significantly greater springback compared to mild steels. In the current study, bendability characteristics of high strength S700MC steel in mild temperatures are investigated using V-bending tests. A temperature range between 25°C and 650°C is analysed. Springback characteristics as well as hardness distribution along the thickness direction in the bent area is investigated for several bent samples.

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Chen, Fuh-Kuo, et Shen-Fu Ko. « Reduction of Springback in V-Bending by a Reverse Bend Approach ». Dans SAE 2005 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2005. http://dx.doi.org/10.4271/2005-01-0087.

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Ozturk, F., et S. Toros. « Determination of Anisotropy Parameters via the Optimization Process of V-Bending ». Dans ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53355.

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In recent years, the use of optimization methods in sheet metal forming has been increased remarkably. In the finite element simulation of the sheet metal stamping operations, the model parameters are determined from the several tests like tensile, compression, and biaxial stretching tests (bulge test). In this study, Yld2000-2d anisotropic yield function parameters are determined for DP800 advanced high strength steel using a 60° V-shaped die bending process. The difference between the simulation and experiment is found to be 1 degree using the classical determination method of the anisotropy parameters. The difference is 0.1 degree using the optimization method.

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Jung, Dooyeun, Youngha Choi, Jae In Lee, Bu-il Nam, Ki-Young Dong, Bohchang Kim, Eunkyoung Kim et al. « Electrical Screening Method of V-NAND Flash Channel Hole Bending Defects ». Dans ISTFA 2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.istfa2021p0306.

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Abstract This paper presents a novel approach for detecting channel hole bending (ChB) defects in vertical NAND flash memory. Such defects are the result of etching process inconsistencies and contribute to data loss and device failure by inducing leakage current between adjacent channel holes. In order to satisfy long-term reliability requirements and volume demand, chipmakers must be able to detect these defects prior to shipping during electrical die sorting and screening procedures. The proposed method works by monitoring leakage current differences between diagonally and horizontally adjacent memory cells and is shown to be an effective screening technique.

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Fang, Gang, et Wei-Ran Gao. « Investigation into springback characteristics of two HSS sheets during cold v-bending ». Dans NUMISHEET 2014 : The 9th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes : Part A Benchmark Problems and Results and Part B General Papers. AIP, 2013. http://dx.doi.org/10.1063/1.4850078.

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Singh, V. Dharam, M. Manzoor Hussain, Syed Shoeb Pasha, K. Phani Raja Kumar et Shasaif Hussain M. « Optimization of Springback in V- Bending at Elevated Temperatures Using Taguchi Approach ». Dans 2nd Indian International Conference on Industrial Engineering and Operations Management. Michigan, USA : IEOM Society International, 2022. http://dx.doi.org/10.46254/in02.20220656.

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Oda, Kazuo, Mitsuyoshi Nakatani, Tomohiro Tanaka, Masamitsu Abe, Yasuhito Takashima et Fumiyoshi Minami. « Evaluation of Bending Limit of 9Cr-1Mo-V Steel by Master Curve and Failure Assessment Diagram Method : Evaluation of Base Metal ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84944.

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We investigated the bending and rolling limit of 9Cr-1Mo-V steel plate used in pressure vessels for the purpose of improving its manufacturing efficiency. Hereafter in this report, the bending limit refers to bending by press or by roller. It includes acceptable crack size, temperature, introduced plastic strain and other factors. When fracture toughness tests of 9Cr-1Mo-V steel plate were performed at bending temperature in production, unstable fracture rarely occurred. Since fracture probability during the bending process seems to be low, it was not possible to evaluate aspects of the degree of safety factor for brittle fracture. To estimate the bending limit at high temperature where unstable fracture rarely occurs, a method was proposed for estimating fracture probability using master curve and failure assessment diagram (FAD). In order to verify the proposed method, loading tests simulating the bending process were performed. The bending limits obtained from the loading tests were in good agreement with the values predicted by the proposed method. In this study, guidelines such as required toughness value and bending temperature for preventing brittle fracture during the bending process of 9Cr-1Mo-V steel plate were investigated.

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de Magalhaes Correia, J. P. « Experimental and numerical study of springback in V-die bending of copper sheets ». Dans MATERIALS PROCESSING AND DESIGN : Modeling, Simulation and Applications - NUMIFORM 2004 - Proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes. AIP, 2004. http://dx.doi.org/10.1063/1.1766642.

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Nakatani, Mitsuyoshi, Kazuo Oda, Tomohiro Tanaka, Masamitsu Abe, Yasuhito Takashima et Fumiyoshi Minami. « Evaluation of Bending Limit of 9Cr-1Mo-V Steel by Master Curve and Failure Assessment Diagram Method : Evaluation of Welded Metal ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84949.

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In this study, the bending and rolling limit of 9Cr-1Mo-V steel plate welded using submerged arc welding (SAW) was investigated. Hereafter in this report, the bending limit refers to bending by press or by roller. Since heat treatment after welding and before the bending process may be effective in preventing brittle fracture during bending, the effect of postweld heat treatment (PWHT) for improving toughness was evaluated by Larson-Miller parameter (LMP). Charpy impact tests of SAW welded parts made of 9Cr-1Mo-V steel plates were performed, and the absorbed energy of the weld metal was lower than that of the heat affected zone (HAZ) and the base metal, however the absorbed energy was recovered by PWHT. The absorbed energy increased as LMP increased. The reference temperature T0 for the master curve method was estimated by the results of Charpy impact tests. The bending limit was estimated by the method proposed in the previous study. The fracture probability during the bending process seems to decrease as LMP increases.

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Rapports d'organisations sur le sujet "V-BENDING"

Yoshizawa, Hideaki, Akira Usui, Souichiro Nishino et Kunio Ohya. Evaluation of Shape Freezing Properties on Form Forming Method for High Tensile Steel Sheets (Comparison With V-Bending Process). Warrendale, PA : SAE International, mai 2005. http://dx.doi.org/10.4271/2005-08-0087.

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Graville, B. A. PR-225-9516-R01 Hydrogen Cracking in the HAZ of High Strength Steels - Development of a Test Method. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), janvier 1996. http://dx.doi.org/10.55274/r0011702.

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Cracking tests for evaluating the susceptibility of the heat affected zone (HAZ) to hydrogen cracking during welding often give ambiguous results because cracks occur in the weld metal rather than the HAZ. To solve this problem, a simple bend test was developed in which a Charpy V-notch was cut in the HAZ after welding the specimen thus ensuring cracks occurred in the desired location when the specimen was subsequently loaded in three-point bending. The test was shown to effectively respond to changes in hydrogen content and base metal composition. The test provides a quantitative measure of susceptibility and it was demonstrated that this could be used to predict crackling behavior in more complex welds.

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Kramer, Wilkowski et Maxey. L51514 Flow Tolerance of Spiral-Welded Line Pipe. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), janvier 1987. http://dx.doi.org/10.55274/r0011237.

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The goals of this research program were to: (1) assess the mechanical and fracture properties of spiral-welded pipe, (2) characterize the crack initiation and maximum load carrying capacity, and (3) determine stress magnification factors for helical flaws. Flattened-strap tensile tests, Charpy V-notch (CVN) tests, and JIC fracture toughness tests were performed to meet the first objective. Results showed that tensile properties are independent of specimen orientation, while CVN data varied by as much as 3 to 1 for parallel vs. transverse machined specimens. Full-scale pipe fracture experiments were conducted to meet the second and third objectives. Results showed that crack initiation was parallel to the rolling direction regardless of the principle stress direction. Stress magnification factors were also developed for through-wall and surface cracks under longitudinal and circumferential stresses. These factors allow design engineers to predict the critical bending stress, circumferential stress, and flaw size for spiral-welded pipe.

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