Plastic Bending at Large Strain: A Review

Alexandrov, Sergei; Lyamina, Elena; Hwang, Yeong‐Maw

doi:10.3390/pr9030406

Cited by 8 publications

(2 citation statements)

References 86 publications

(124 reference statements)

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“…The majority of studies on the instability of pressure on the spherical shell structures pay close attention to factors such as changes in the thickness and shape of the spherical shell structure during the forming process [44,45]. In this study, moulds and proximity sensors were used to control the structural shape of the rupture disc, so the thickness change in the structure in the weak area of the rupture disc was the main focus of concern.…”

Section: Analysis Of the Effect Of Forming Pressure On Burst Pressurementioning

confidence: 99%

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Liu

Yuan

et al. 2021

Processes

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Rupture discs, also called bursting discs, are widely used in pressure vessels, pressure equipment, and pressure piping in process industries, such as nuclear power, fire protection, and petrochemical industries. To explore the relationship between the burst pressure of reverse-acting rupture discs and their production, two common manufacturing methods, air pressure moulding and hydraulic moulding, were compared in this study. Reverse-acting rupture discs that complied with the form recommended by API 520-2014 were prepared with four release diameters, and burst pressure tests were carried out. These results showed an obvious negative correlation between the forming pressure of rupture discs and their actual burst pressure for all experimental samples. Further study showed that the main reason for this correlation was a reduction in thickness at the top of the rupture disc caused by large plastic deformation during compression moulding. To explore the relationship between the thickness reduction effect and moulding method, this study defined the “relative ratio of thickness reduction” and concluded that the effect of decreasing the thickness of the rupture disc was more obvious for rupture disc substrates with less flexural rigidity. The above conclusions have important significance for guiding the control of the burst pressure of rupture discs.

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Section: Analysis Of the Effect Of Forming Pressure On Burst Pressurementioning

confidence: 99%

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Liu

Yuan

et al. 2021

Processes

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show abstract

“…The present paper combines the ideal flow theory for non-stationary planar processes and the method for analyzing plane-strain bending proposed in [13]. A review of the latter is presented in [14]. The design objective is to determine an ideal flow loading path that results in desirable geometric parameters after unloading.…”

Section: Introductionmentioning

confidence: 99%

Ideal Flow Design of Plane-Strain Bending Driven by Springback

2022

Self Cite

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The present paper is concerned with the design of the plane-strain bending of wide sheets driven by the sheet’s geometric shape after unloading. The solution is based on the ideal flow theory. It determines the loading path (the dependence between the dimensionless bending moment and the dimensionless tensile force) that produces the desirable shape. The ideal flow theory is valid for the rigid perfectly plastic material model. A method proposed in the literature combines a rigid plastic solution at loading and an elastic solution for springback. The final design solution is practically analytical. A numerical method is only necessary to solve a system of transcendental equations. An illustrative example is provided. This example shows that, in some cases, it is sufficient to use the solution at loading to determine an accurate loading path that produces the desirable sheet’s shape after springback.

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Straightforward identification of flow curve and yield locus parameters from three-point bending experiments

Hartmann,

Maier,

Liu

et al. 2024

Int J Mater Form

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Material testing and modeling is one of the cornerstones of virtual analysis of sheet metal forming processes. However, it is also becoming more and more relevant for incoming goods inspection, especially in view of the increasing amount of recycled material or frequent changes of suppliers, e.g. to provide workers, processes and/or process models with relevant information about a new batch of material. Efficient material testing and straight-forward test evaluation is essential for this. The flow curve and yield locus are central to describe the forming behavior of sheet metal materials. However, the parameters of the associated models are currently determined in various tests on different systems and with special sample geometries. The present work presents a methodology that allows the determination of a set of flow curve and yield locus parameters from three three-point bending tests only. The evaluation routine does not require finite element simulation and processes only the force-displacement information of the bending tests, which also places low demands on the measurement technology. The results were compared with a conventionally determined parameter set using a validation test, and the results are of reasonable quality, especially considering the minimal effort involved.

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Plastic Bending at Large Strain: A Review

Cited by 8 publications

References 86 publications

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Influence of Moulding Pressure on the Burst Pressure of Reverse-Acting Rupture Discs

Ideal Flow Design of Plane-Strain Bending Driven by Springback

Straightforward identification of flow curve and yield locus parameters from three-point bending experiments

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