On the utilisation of ductile fracture criteria in cold forging

Landre, Jánes; Pertence, Antônio Eustáquio de Melo; Cetlin, Paulo Roberto; Rodrigues, J.M.C.; Martins, P.A.F.

doi:10.1016/s0168-874x(02)00065-3

Cited by 52 publications

(28 citation statements)

References 11 publications

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“…Hence, ductile fracture is a significant limitation influencing the productivity in metalworking processes. Therefore, early predicting the occurrence of ductile fracture in processed materials during metalworking operations has been attracted a lot of researchers [1][2][3]. Metal workability is one of the most important parameters considered during designing the forming operations.…”

Section: Introductionmentioning

confidence: 99%

“…In order to prevent the plastic limits and improve the metalworking operations, forming limits have to be predicted correctly. A fracture forming limit diagram (FFLD) and ductile fracture criteria (e.g., Cockcroft-Latham (CL), Brozzo, McClintock, Oyane) were used as a tool to describe the material formability [1][2][3][4][5][6]. The FFLD is a suitable way to display the workability in a graphical illustration as well as display the threshold limit of principal strain when the material could be processed without a failure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of ductile fracture criteria for bulk and PM materials

KVACKAJ¹,

TIŽA²,

KOVÁČOVÁ³

et al. 2016

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In the paper, calculation of the ductile fracture criteria for experimental materials as HSLA (high strength low alloy) steel, aluminium alloy EN AW 6082 T6 and powder metallurgy material ALUMIX 321 was carried out. Using ring and compression tests, it was possible to determine friction coefficient, stress-strain curves, constants for the Hollomon's equation, material workability and nCL (normalized Cockcroft-Latham) criteria. Moreover, the results from the nCL criteria calculations obtained from compression tests and numerical simulations were compared and verified. Numerical simulations were done by the Deform 3D software. It was confirmed that both methods provide similar results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of ductile fracture criteria for bulk and PM materials

KVACKAJ¹,

TIŽA²,

KOVÁČOVÁ³

et al. 2016

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“…The some other stress-strain criteria are described in references [3,4,5]. According to the works [6], that should be considered as most precise stress-strain criteria derived by authors Cockcroft-Latham and Oyane et al for all sample shapes [7,8].…”

Section: Introductionmentioning

confidence: 99%

Application of Workability Test to Spd Processing

Kvačkaj¹,

Kočiško²,

Tiža³

et al. 2013

Archives of Metallurgy and Materials

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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 normalized Cockcroft-Latham). The prediction of fracture formations in a real ECAR sample during processing conditions was also done.Keywords: compression test, powder metallurgy, fracture criteria, ECAR, Deform 3DStop aluminium o składzie chemicznym AlMgSi przygotowano metodą proszkową. Wykonano badania takie jak próba ściskania swobodnego pierścieni i walcowatych, ECAR (wyciskanie w kanale kątowym z walcowaniem) w celu wyznaczenia współczynnika tarcia, krzywych naprężenie-odkształcenie oraz podatności materiału na odkształcenie z użyciem metod analitycznych (kryterium Freudenthal, Cockcroft-Latham i znormalizowane Cockcroft-Latham). Symulacje numeryczne dla próbki poddawanej procesowi ECAR przeprowadzono przy pomocy oprogramowania Deform 3D z naciskiem na opis pól sił i naprężeń oraz kryteriów obrabialności (Cockcroft-Latham i znormalizowane Cockcroft-Latham). Przeprowadzono również symulację możliwości tworzenia się pęknięć w rzeczywistej próbce poddanej procesowi ECAR.

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“…The Cockcroft-Latham fracture criterion is widespread in the analysis of fractures in metal forming and used by the authors all over the world [12][13][14]; today it is one of the most common fracture criteria in the analysis of the material plasticity resource. At the same time, it should be noted that this criterion does not take into account the material properties relaxation that occurs during the rolling process when the material is not in the deformation zone, i.e.…”

Section: Amandtmentioning

confidence: 99%

Mathematical and Physical Modeling of the Rolling Process of Tapered Shafts for Aviation Purposes

Sukhorukov¹,

Sidorov²,

Alimov³

et al. 2016

AM&T

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One of the most promising methods for manufacture of axially symmetric parts such as disks or hollow shafts of gas turbine engines is local deformation using cold rolling. Physical and mathematical modeling can be quite effective for designing this class of equipment and process operations. This article presents the methodology and results of physical and mathematical finite element modeling of local deformation of parts such as a tapered cylinder fabricated from chromium steel alloy grade 11H11N2V2МF-Sh. Chemical elements in the alloy are designated by the letters which stand for: H -Chromium, N -Nickel, V -tungsten, M -molybdenum, F -vanadium, Sh -electroslag remelting. According to GOST 5632-72 (Russian standard), this type of nickel-chromium alloy consists of about 11 % of chromium, 1.5-2 % of tungsten and nickel, up to 1 % of molybdenum and vanadium, and 0.11 % of carbon, hundredths of one percent of phosphorus and sulfur. It is heat-resistant high-grade steel, which is used for the manufacture of parts operating unloaded at 900-1000 °C. The purpose of the paper is to analyze the process energy-power parameters and possible fracture of parts during deformation.

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On the utilisation of ductile fracture criteria in cold forging

Cited by 52 publications

References 11 publications

Determination of ductile fracture criteria for bulk and PM materials

Determination of ductile fracture criteria for bulk and PM materials

Application of Workability Test to Spd Processing

Mathematical and Physical Modeling of the Rolling Process of Tapered Shafts for Aviation Purposes

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