Ductile fracture and deformation behavior in progressive microforming

Meng, Bao; Fu, Ming; Fu, Can; Chen, K.S.

doi:10.1016/j.matdes.2015.05.088

Cited by 46 publications

(25 citation statements)

References 35 publications

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“…A schematic of the punch and die used for the punching experiments is shown in Figure 1. microforming [23]. Through the results, it was found that the Ayada criterion can predict fracture, rollover, and shearing zones in the shearing stage, and the Cockcroft and Latham criterion can predict the depth of the fracture zone, which has good agreement with the experimental result in blanking.…”

Section: Punching Experimentssupporting

confidence: 51%

“…Mohr and Marcadet used the phenomenological Hosford-Coulomb model to predict ductile fracture initiation at low stress triaxialities [22]. Meng et al used phenomenological ductile fracture criteria to study the deformation behavior in progressive microforming [23]. Through the results, it was found that the Ayada criterion can predict fracture, rollover, and shearing zones in the shearing stage, and the Cockcroft and Latham criterion can predict the depth of the fracture zone, which has good agreement with the experimental result in blanking.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

Myint

Hagihara

Tanaka

et al. 2017

JMMP

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Punching processes are widely used for producing automobile parts, mechanical components, and other parts. To produce highly accurate parts, it is important to estimate the ratio of the sheared surface to the cut surface. Many researchers have applied the finite-element method (FEM) to analyze the ratio of the sheared surface to the fracture surface on cut surfaces by using ductile fracture criteria. However, it is difficult to determine the fracture criteria on the cut surface by tensile tests or bending tests because the punching process involves many complicated steps. In this study, FEM was applied to the punching process to determine the values of critical fracture criteria (C) by using the ductile fracture criteria proposed by Cockcroft and Latham, Oyane, and Ayada. The ductile fracture criteria were compared with the boundary between the shear surface and the fracture surfaces using experiments performed with a simple punching system. The values of the ductile fracture criteria for the fracture initiation of the formed cut surface were predicted under various clearances between the punch and the die with various punch diameters. The influence of stress triaxiality and the effect of punch diameter on the sheared surface length are also discussed.

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Section: Punching Experimentssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

Myint

Hagihara

Tanaka

et al. 2017

JMMP

View full text Add to dashboard Cite

show abstract

“…Fu and Chan [12,13] conducted experiments by designing two scales of progressive forming systems to fabricate meso-/microcylinder parts via microblanking process and focused on the characteristic of formed parts. Meng et al [14][15][16] extensively investigated the material deformation behavior and the fracture effect of shearing in microcylinder parts forming processes by using the same method. In addition, the influence of forming conditions on deformation behavior, fractured surface quality and dimensional accuracy in shearing operation were systematically investigated.…”

Section: Progressive Formed Parts 21 Micro-cylinder Partsmentioning

confidence: 99%

“…They also discussed the relationship between grain size and deformation behaviors. Based on the prior studies, Meng et al [14][15][16] conducted further and extensive studies of micro progressive forming. In these cases, the cylinder, double-flanged and variable-thickness flanged microparts were manufactured by progressive microforming, respectively.…”

Section: Introductionmentioning

confidence: 99%

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A Review of Progressive and Compound Forming of Bulk Microparts by Using Sheet Metals

Zheng

Meng

2018

MATEC Web Conf.

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In the last decade, the concept of progressive microforming has emerged and developed gradually, which is considered as an efficient and promising method to fabricate the micro-scaled part. Micro-cylinder parts, micro-flanged part, and multi-flanged microparts are representative micro bulk parts by the progressive microforming system using sheet metal. In these cases, many efforts focus on the forming process, such as microblanking and microextrusion. Meanwhile, the quality of the fabricated parts also attracts attention. In this paper, an intensive review on the development of progressive microforming technologies and the formed parts is presented, and the influence of size effect to dimensional accuracy, material flow, geometrical feature, and fracture is also discussed.

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Microbulging extrusion of aluminum alloy to fabricate micro/meso features for heat pipes

Ding

Jin

2016

Int J Adv Manuf Technol

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Ductile fracture and deformation behavior in progressive microforming

Cited by 46 publications

References 35 publications

Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

Determination of the Values of Critical Ductile Fracture Criteria to Predict Fracture Initiation in Punching Processes

A Review of Progressive and Compound Forming of Bulk Microparts by Using Sheet Metals

Microbulging extrusion of aluminum alloy to fabricate micro/meso features for heat pipes

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