Academic literature on the topic 'Cockcroft-Latham'

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Journal articles on the topic "Cockcroft-Latham"

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Kvačkaj, T., R. Kočiško, J. Tiža, et al. "Application of Workability Test to Spd Processing." Archives of Metallurgy and Materials 58, no. 2 (2013): 407–12. http://dx.doi.org/10.2478/amm-2013-0008.

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The aluminium alloy with chemical conception AlMgSi prepared by PM (powder metallurgy) technology was used. The experiments such as a ring and compression test, ECAR (equal channel angular rolling) for determination of friction coefficient, stress-strain curves and material workability based on analytical methods (Freudenthal, Cockcroft-Latham and normalized Cockcroft-Latham criteria) were performed. Numerical simulations of sample processed by ECAR was carried out by a software Deform 3D with focus on the description of stress, strain fields and workability criteria (Cockcroft-Latham and norm
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Bulzak, Tomasz, Zbigniew Pater, Janusz Tomczak, and Łukasz Wójcik. "A rotary compression test for determining the critical value of the Cockcroft–Latham criterion for R260 steel." International Journal of Damage Mechanics 29, no. 6 (2019): 874–86. http://dx.doi.org/10.1177/1056789519887527.

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A method for determining the critical value of the Cockcroft–Latham damage criterion is presented using the example of R260 railway steel. The determinations were performed using a rotary compression test specially developed for that purpose. The main object of the proposed test was to provide the best possible representation of the state of stress generated by cross-wedge rolling. The rotary compression test was performed in two stages: in the first stage, experimental tests were conducted to establish the moment of cracking of the specimen, and in the second stage, numerical modeling was use
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Christiansen, Peter, Paulo Martins, Niels Bay, and Jesper Hattel. "Numerical Modelling of Damage Evolution in Ingot Forging." Key Engineering Materials 651-653 (July 2015): 237–42. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.237.

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The ingot forging process is numerically simulated applying both the Shima-Oyane porous plasticity model as a coupled damage model and the uncoupled normalized Cockcroft & Latham criterion. Four different cases including two different lower die angles (120oand 180o) and two different sizes of feed (400mm and 800mm) are analysed. Comparison of the simulation results with recommendations in literature on ingot forging, indicates the normalized Cockcroft & Latham damage criterion to be the most realistic of the two.
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Kvačkaj, Tibor, Juraj Tiža, Július Bacsó, et al. "Cockcroft-Latham Ductile Fracture Criteria for Non Ferrous Materials." Materials Science Forum 782 (April 2014): 373–78. http://dx.doi.org/10.4028/www.scientific.net/msf.782.373.

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The determination of ductile fracture criteria as well as friction coefficient, stress-strain curves, constants for Hollomon's equation and a material workability based on analytical methods as a forming limit diagram, a normalized Cockcroft-Latham criteria (nCL)) ring and compression tests for two materials based on aluminum and copper alloys were carried out. A calculation of nCL criteria on the basis of a compression test and numerical simulations was made. The critical values nCL criteria resulting from compression test were determined. Prediction of nCL criteria by numerical simulations w
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Duan, Xing Wang, Xiu Zhi Zhang, Xin Peng Wei, Jian Sheng Liu, Wen Wu He, and Ji Hong Tian. "Application of Ductile Fracture Criterion in Hot Forging Damage of Mn18Cr18N Steel." Advanced Materials Research 139-141 (October 2010): 510–15. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.510.

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In this paper, the hot forging behavior of Mn18Cr18N steel is studied based on the viewpoint of meso-damage. According to high temperature tensile stress - strain curve of Mn18Cr18N steel under different temperatures, the relationships of void initiation strain and fracture strain with deformation temperature are obtained. The temperature dependence of damage threshold is obtained at 950°C~1200°C for Mn18Cr18N steel by Cockcroft & Latham criterion, That is, Ci,f value increases monotonously with temperature increasing. The corresponding deformation amounts of void initiation and fracture a
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Stebunov, Sergey, Andrey Vlasov, and Nikolai Biba. "Prediction of fracture in cold forging with modified Cockcroft-Latham criterion." Procedia Manufacturing 15 (2018): 519–26. http://dx.doi.org/10.1016/j.promfg.2018.07.264.

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Quan, Guo-zheng, Gui-chang Luo, An Mao, Jian-ting Liang, and Dong-sen Wu. "Evaluation of Varying Ductile Fracture Criteria for 42CrMo Steel by Compressions at Different Temperatures and Strain Rates." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/579328.

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Fracturing by ductile damage occurs quite naturally in metal forming processes, and ductile fracture of strain-softening alloy, here 42CrMo steel, cannot be evaluated through simple procedures such as tension testing. Under these circumstances, it is very significant and economical to find a way to evaluate the ductile fracture criteria (DFC) and identify the relationships between damage evolution and deformation conditions. Under the guidance of the Cockcroft-Latham fracture criteria, an innovative approach involving hot compression tests, numerical simulations, and mathematic computations pr
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Kim, Hong-Seok, Yong-Taek Im, and Manfred Geiger. "Prediction of Ductile Fracture in Cold Forging of Aluminum Alloy." Journal of Manufacturing Science and Engineering 121, no. 3 (1999): 336–44. http://dx.doi.org/10.1115/1.2832686.

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In this paper, the limitation and applicability of the ductile fracture criteria based on a work hypothesis and Cockcroft and Latham were investigated. For this purpose, experimental and numerical investigations for simple upsetting were conducted for aluminum alloys Al1100-O, Al2024-T3, Al6061-T4, and Al7075-T4. As a result, the fracture mode of each alloy was observed. The study was extended for pin-shape cold forging of Al1100-O and Al6061-T4 to compare the likeliness of fracturing according to two criteria. Based on experimental data of simple upsetting, the damage factors for the same two
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Scari, Alexandre da Silva, Bruno Cesar Pockszevnicki, Jánes Landre Junior, and Pedro Americo Almeida Magalhaes Junior. "Stress-Strain Compression of AA6082-T6 Aluminum Alloy at Room Temperature." Journal of Structures 2014 (November 13, 2014): 1–7. http://dx.doi.org/10.1155/2014/387680.

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Short cylindrical specimens made of AA6082-T6 aluminum alloy were studied experimentally (compression tests), analytically (normalized Cockcroft-Latham criteria—nCL), and numerically (finite element analysis—FEA). The mechanical properties were determined with the stress-strain curves by the Hollomon equation. The elastic modulus obtained experimentally differs from the real value, as expected, and it is also explained. Finite element (FE) analysis was carried out with satisfactory correlation to the experimental results, as it differs about 1,5% from the damage analysis by the nCL concerning
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Bartnicki, J., J. Tomczak, and Z. Pater. "Numerical Analysis of the Cross-Wedge Rolling Process by Means of Three Tools of Stepped Shafts From Aluminum Alloy 7075." Archives of Metallurgy and Materials 60, no. 1 (2015): 433–35. http://dx.doi.org/10.1515/amm-2015-0071.

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Abstract This paper presents results of numerical calculations for the rolling process by means of three tools of stepped shafts from aluminum alloy 7075. Forming with the usage of tools with three different wedge spreading angles underwent analysis. In the paper, the obtained distributions of stresses, strains and Cockcroft-Latham damage criterion were given. Moreover, the influence of the wedge spreading angle on shape faults presence in the obtained product was determined. At the same time, the force parameters, which play a crucial role in the designed experiment, were analyzed.
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Dissertations / Theses on the topic "Cockcroft-Latham"

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Björklund, Oscar. "Modelling of failure." Thesis, Linköping University, Department of Management and Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11466.

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<p>This report is a review of some failure models today used for determine failure in thin sheets of high strength steels. Focus has been given on phenomenlogical models and only some simple simulations have been carried out. The phenomenlogical models that have been summarized here are of four different categories, namely stress based, strain based, combined stress and strain based and damaged models. However, the simulations have only been preformed for some of the models.</p>
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Conference papers on the topic "Cockcroft-Latham"

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Sugimoto, Nao, Naoki Takaki, and Kenji Takada. "Fracture Characteristic Prediction of High-Strength Aluminum Alloy Extrusion using Cockcroft-Latham Ductile Fracture Criteria." In WCX World Congress Experience. SAE International, 2018. http://dx.doi.org/10.4271/2018-01-0109.

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Kristoffersen, Martin, Tore Børvik, and Lars Olovsson. "Pipeline Fracture due to Compression-Tension Loading Caused by Foreign Object Impact." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77964.

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In areas frequented by fishing vessels, trawl equipment or anchors may interfere with pipelines and cause damage through impact, potential hooking, and ensuing release of the pipeline. This load sequence of denting followed by global bending and springback results in a complex stress and strain history. Experiments have shown that fracture in an impacted pipe typically arises along the bottom of the dent, where the material suffers high compressive strains in the impact and hooking phase, and a rapid change to tension during the rebound phase. High compressive strains may reduce the strain to
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