Analysis of core shear stress in welded deformable sandwich plates to prevent de-bonding failure during U-bending

Seong, Dae‐Yong; Jung, CG; Yang, Dong‐Yol; Ahn, Jeong Joon; Na, Suck-Joo; Chung, Wan‐Jin; Kim, J. H.

doi:10.1016/j.jmatprotec.2010.02.026

Cited by 14 publications

(19 citation statements)

References 17 publications

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“…26,[28][29][30]35,36,[63][64][65][66][67]71 Sheared dimple and bi-directional corrugated inner structures were contrived to greatly improve the formability and the out-of-plane performance of the metallic sandwich plate through the improvement of the resistance to face wrinkling and core shear. 61,62,[68][69][70][71][72][73] The bi-directionally corrugated inner structures led to the improvement of anisotropic characteristics of uni-directionally corrugated inner structures. 69 In order to improve the resistance to face buckling and joining characteristics between the face sheets and inner structures, flat regions were created in the vicinity of node regions of the sheared dimple and the bi-directionally corrugated inner structures, as shown in Fig.…”

Section: 5657mentioning

confidence: 99%

“…61,62,[68][69][70][71][72] Metallic sandwich plates with sheared dimple and bidirectionally corrugated inner structures can be applicable to forming of parts with a small radius of curvature of the forming die. 61,68,71,72 Pyramidal truss, sheared dimple and bi-directionally corrugated inner structures were made from a mild steel. 30,35,63,64,67,68 Stainless steel was used to create woven wire and dimple inner structures.…”

Section: 5657mentioning

confidence: 99%

“…30,35,63,66,[69][70][71] In case of the sheared dimple inner structure, 590 dual phase (DP) steel and 304 stainless steel were used to create the face sheets. 61,62,68,[70][71][72] Mild steel was utilized as the face sheet material of the bi-directionally corrugated inner structures. 68 …”

Section: 5657mentioning

confidence: 99%

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Research trends of metallic sandwich plates with single layer periodically repeated metallic inner structures (PRMIS) - focused on design, manufacturing and formability

Ahn

2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Recently, the attempt to decrease greenhouse gases, noxious gases and utilized energy sources has emerged as a crucial issue in the world to manage problems of global warming, resource depletion and air pollution. Institutes, universities and industries related to transport vehicles have endeavored to solve these crucial problems through the reduction of the overall weight of transport vehicles. However, the weight reduction of components of transport vehicles greatly affects the strength, the stiffness and the energy absorption of transport vehicles. Metallic sandwich plates with periodically repeated metallic inner structures (PRMIS) have been introduced to meet these conflicting demands. This paper reviews recent research trends of metallic sandwich plates with PRMIS in terms of design, manufacturing and formability. This paper is focused on a single layer PRMIS. Key technologies and the state-of-the art related to design, manufacturing and formability of metallic sandwich plates with PRMIS are discussed. In addition, future research issues of metallic sandwich plates with PRMIS are described.

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Section: 5657mentioning

confidence: 99%

Section: 5657mentioning

confidence: 99%

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Research trends of metallic sandwich plates with single layer periodically repeated metallic inner structures (PRMIS) - focused on design, manufacturing and formability

Ahn

2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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“…As the main problem in the bending process, spring-back is the key factor that affects the quality of complicated U-shaped parts. A great deal of research has been conducted on this in the past [8][9][10][11][12][13][14][15][16][17][18]. Jiang and Dai [8] proposed a novel model to predict U-bend spring-back and time-dependent spring-back for a high-strength low-alloy (HSLA) steel plate.…”

Section: Introductionmentioning

confidence: 99%

“…Thipprakmas and Phanitwong [14] used the finite element method to analyze the bending mechanisms and spring-back/spring-go characteristics in various U-bending processes. Seong et al [15] analyzed the core shear stress in welded deformable sandwich plates to prevent de-bonding failure during U-bending. To prevent failure during the bending phase of sandwich plates, it was recommended that the clearance be three times larger than the thickness of the sandwich plate.…”

Section: Introductionmentioning

confidence: 99%

Design of U-Geometry Parameters Using Statistical Analysis Techniques in the U-Bending Process

Phanitwong

Boochakul

Thipprakmas

2017

Metals

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Abstract:The various U-geometry parameters in the U-bending process result in processing difficulties in the control of the spring-back characteristic. In this study, the effects of U-geometry parameters, including channel width, bend angle, material thickness, tool radius, as well as workpiece length, and their design, were investigated using a combination of finite element method (FEM) simulation, and statistical analysis techniques. Based on stress distribution analyses, the FEM simulation results clearly identified the different bending mechanisms and effects of U-geometry parameters on the spring-back characteristic in the U-bending process, with and without pressure pads. The statistical analyses elucidated that the bend angle and channel width have a major influence in cases with and without pressure pads, respectively. The experiments were carried out to validate the FEM simulation results. Additionally, the FEM simulation results were in agreement with the experimental results, in terms of the bending forces and bending angles.

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Centered coined-bead technique for precise U-bent part fabrication

Phanitwong

Thipprakmas

2015

Int J Adv Manuf Technol

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Recently, during the fabrication of U-bent parts, increasing levels of precision have been required not only for the bend angle of the part but also for the bend radius and the flatness of its bottom surface. The conventional coined-bead technique is therefore unlikely to be applied to achieve these requirements. As an innovative variation of the coined-bead technique, the centered coined-bead technique is proposed and investigated in this study. The finite element method (FEM) was used to clearly identify the parameters of interest based on a stress distribution analysis. The results show that the centered coined-bead formation could be applied to produce a balance between the bending and reversed bending characteristics and to eliminate these characteristics in the bottom surface. Therefore, a precise bend angle and bend radius and a flat bottom surface could be achieved. The effects of the coined-bead geometry and its positioning are also examined and clearly identified, and laboratory experiments were carried out to validate the FEM simulation results. Each U-bent part could be fabricated with a precise bend angle and bend radius and a flat bottom surface using the centered coined-bead technique. The recommended coined-bead geometry and positioning are also reported.

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Analysis of core shear stress in welded deformable sandwich plates to prevent de-bonding failure during U-bending

Cited by 14 publications

References 17 publications

Research trends of metallic sandwich plates with single layer periodically repeated metallic inner structures (PRMIS) - focused on design, manufacturing and formability

Research trends of metallic sandwich plates with single layer periodically repeated metallic inner structures (PRMIS) - focused on design, manufacturing and formability

Design of U-Geometry Parameters Using Statistical Analysis Techniques in the U-Bending Process

Centered coined-bead technique for precise U-bent part fabrication

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