Evaluation of ductile failure models in Sheet Metal Forming

Amaral, Rui; Teixeira, Pedro; Azinpour, Erfan; Santos, Abel D.; de, Jose Cesar

doi:10.1051/matecconf/20168003004

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…In the case of bare specimen, cutting orientation obviously affected the tensile property of the material and presented anisotropic properties of the material after sheet metal forming. This phenomenon has an agreement with several previous studies [16,22,25,26]. The anisotropic properties of the stent material should be considered thoughtfully in conducting FEM studies because the raw material of the stent is actually having tube-shaped, which is come from seamless redrawn welded tubes.…”

Section: Resultssupporting

confidence: 89%

Effect of Surface Treatment and Cutting Orientation to the Changes in Stents Surface Roughness

Syaifudin

Ariatedja

Sasaki

2020

KEM

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During the implantation process, an expandable balloon stent undergoes a change in mesh shape with a high strain rate. Permanent mesh shape changes to the stents indicate plastic deformation has occurred. On a micro-scale, plastic deformation has significant influence when interacting with the soft tissue of human blood vessels. This experimental study aims to investigate the effect of surface treatment and cutting orientation on the changes in surface roughness that definitely occurs when a stent deployed. To study the effect of surface treatment, two types of surface treatment were applied after surface polishing, i.e. etching and electropolishing. Surface polishing is carried out to enable microscopic observation. As for examining the effect of cutting orientation, the plate is cut in lateral and longitudinal orientation against the predicted-rolling direction of 316L sheet-type of stainless steel. An intermittent tensile test is conducted to obtain information about the changes in surface roughness. The surface observation is carried out three times on a similar surface of testpiece after reaching plastic deformation. The experimental study shows that the orientation of raw material has an insignificant effect on the changes in stent surface roughness. As for the surface treatments, electropolishing tended to decrease the tensile property of material.

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Section: Resultssupporting

confidence: 89%

Effect of Surface Treatment and Cutting Orientation to the Changes in Stents Surface Roughness

Syaifudin

Ariatedja

Sasaki

2020

KEM

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“…Plastic properties of the material were assumed as isotropic and were obtained as tabular values from the stress-strain curve, where plastic strain 0 occurs at 112 MPa. The damage of the material was modelled with the simplified Johnson-Cook model [31,43,44], where the deformation rate and temperature are insignificant (d 4 and d 5 equal 0). The remaining J-C parameters are shown in Table 7.…”

Section: Validation Of the Analytical Model With Using Fem Analysesmentioning

confidence: 99%

Estimation of the perforation force for polymer composite conveyor belts taking into consideration the shape of the piercing punch

Wojtkowiak

Talaśka

Malujda

et al. 2018

Int J Adv Manuf Technol

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Due to the improvement of the mechanical properties of polymer composite belts used in vacuum belt conveyors, its perforation process causes a lot of technical issues for manufacturers worldwide. The objective of this paper is to analyze the belt punching process with two cutting edges and present the influence of the piercing punch shape on the perforation force. Based on the analysis, the analytical stress model was derived and validated by using both empirical and FEM tests. The application of the proposed model was proved by presenting the methodology used to estimate the perforation force for the flat piercing punch based on the mechanical properties of the belt obtained from simple strength tests (uniaxial tension, compression, and shear), with an error between 4 and 15%. In this report, the analysis of the piercing punch profiles was made and eight different piercing punch profiles were tested. Presented results confirmed that the spherical bowl punch may be considered as a most effective tool for belt punching, because it reduced the perforation force by 60% and the precision of the created holes was the best among the tested punch profiles for all three groups of polymer composite belts. By combining the obtained results, in the form of shape factors β, with the perforation force approximation model, it is possible to calculate peak force value for the specified tool profile and belt type and use this data in the design process of the punching dies.

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“…In this research work, finite element simulation and the Johnson and Cook damage model have been used to optimize the punching process. This damage model defines the material fracture as a function of triaxiality, the plastic deformation rate and temperature [19]. Using this damage model, it is possible to predict damage and fracture in metallic materials subjected to dynamic loads [20].…”

Section: Introductionmentioning

confidence: 99%

Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

Claver,

Acosta,

Barba

et al. 2024

Metals

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Sheet metal forming processes are widely used in applications such as those in the automotive or aerospace industries. Among them, punching is of great interest due to its high productivity and low operating cost. However, it is necessary to optimize these processes and adjust their parameters, such as clearance, shear force or tool geometry, to obtain the best finishes and minimize crack generation. Thus, the main objective of this research work is to optimize the punching process to achieve parts that do not require subsequent processes, such as deburring, by controlling the properties of the starting materials and with the help of tools such as design of experiments and simulations. In the present study, tensile tests were performed on three steels with different compositions and three sample geometries. The information obtained from these tests has allowed us to determine the parameters of the Johnson–Cook damage criteria. Moreover, punching was performed on real parts and compared with simulations to analyze the percentage of burnish surface. The results obtained show that the methodology used was correct and that it can be extrapolated to other types of die-cutting processes by reducing the percentage of surface fractures and predicting the appearance of cracks. Furthermore, it was observed that clearance has a greater influence than processing speed, while the minimum percentage of the burnish area was observed for the minimum values of clearance.

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Evaluation of ductile failure models in Sheet Metal Forming

Cited by 14 publications

References 16 publications

Effect of Surface Treatment and Cutting Orientation to the Changes in Stents Surface Roughness

Effect of Surface Treatment and Cutting Orientation to the Changes in Stents Surface Roughness

Estimation of the perforation force for polymer composite conveyor belts taking into consideration the shape of the piercing punch

Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

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